Zirconium Diboride

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William G Fahrenholtz - One of the best experts on this subject based on the ideXlab platform.

  • effect of tantalum solid solution additions on the mechanical behavior of zrb2
    Journal of The European Ceramic Society, 2020
    Co-Authors: Anna N Dorner, Gregory E Hilmas, Katharina Werbach, William G Fahrenholtz
    Abstract:

    Abstract Mechanical properties and microstructure were compared for Zirconium Diboride and two Zirconium Diboride solid solutions containing 3 and 6 at% tantalum Diboride. X-ray diffraction indicated that the ceramics were nearly phase-pure and that tantalum dissolved into the ZrB2 lattice to form (Zr,Ta)B2 solid solutions. Microstructural analysis indicated that samples achieved nearly full relative density with average grain sizes that ranged from 3−5 μm. The three compositions had similar values of Young’s modulus (510−531 GPa), shear modulus (225−228 GPa), Vickers hardness (15.2–16.4 GPa), and flexural strength (391−452 MPa). Fracture toughness ranged from 2.6 to 3.7 MPa m1/2 and with increasing tantalum content, the fracture mode changed from predominantly intergranular to predominantly transgranular. Diboride solid solution materials had comparable properties to the single metal Diboride, but differences in microstructure, secondary phases, and strain state among the three ceramics partially obscured the actual effects of the solid solution on fracture behavior.

  • mechanical properties and grain orientation evolution of Zirconium Diboride Zirconium carbide ceramics
    Journal of The European Ceramic Society, 2018
    Co-Authors: Andrea Dangio, Ji Zou, Jon G P Binner, Gregory E Hilmas, William G Fahrenholtz
    Abstract:

    Abstract The effect of ZrC on the mechanical response of ZrB 2 ceramics has been evaluated from room temperature to 2000 °C. Zirconium Diboride ceramics containing 10 vol% ZrC had higher strengths at all temperatures compared to previous reports for nominally pure ZrB 2 . The addition of ZrC also increased fracture toughness from ∼ 3 .5 MPa m for nominally pure ZrB 2 to ∼ 4 .3 MPa m due to residual thermal stresses. The toughness was comparable with ZrB 2 up to 1600 °C, but increased to 4 .6 MPa m at 1800 °C and 2000 °C. The increased toughness above 1600 °C was attributed to plasticity in the ZrC at elevated temperatures. Electron back-scattered diffraction analysis showed strong orientation of the ZrC grains along the [001] direction in the tensile region of specimens tested at 2000 °C, a phenomenon that has not been observed previously for fast fracture (crosshead displacement rate = 4.0 mm min −1 ) in four point bending. It is believed that microstructural changes and plasticity at elevated temperature were the mechanisms behind the ultrafast reorientation of ZrC.

  • processing microstructure and mechanical properties of Zirconium Diboride boron carbide ceramics
    Ceramics International, 2017
    Co-Authors: Eric W Neuman, Gregory E Hilmas, William G Fahrenholtz
    Abstract:

    The processing, microstructure, and mechanical properties of Zirconium Diboride-boron carbide (ZrB2-B4C) ceramics were characterized. Ceramics containing nominally 5, 10, 20, 30, and 40 vol% B4C were hot-pressed to full density at 1900 °C. The ZrB2 grain size decreased from 4 to 2 µm and B4C inclusion size increased from 3 to 5 µm for B4C additions of 5 and 40 vol% B4C, respectively. Elastic modulus decreased from 525 to 515 GPa and Vickers hardness increased from 15 to 21 GPa as the B4C content increased from 5 to 40 vol%, respectively, following trends predicted using linear rules of mixtures. Flexure strength and fracture toughness both increased with increasing B4C content. Fracture toughness increased from 4.1 MPa m½ at 5 vol% B4C to 5.3 MPa m½ at 40 vol% B4C additions. Flexure strength was 450 MPa with a 5 vol% B4C addition, increasing to 590 MPa for a 40 vol% addition. The critical flaw size was calculated to be ~30 µm for all compositions, and analysis of the fracture surfaces indicated that strength was controlled by edge flaws generated by machining induced sub-surface damage. Increasing amounts of B4C added to ZrB2 led to increasing hardness due to the higher hardness of B4C compared to ZrB2 and increased crack deflection. Additions of B4C also lead to increases in fracture toughness due to increased crack deflection and intergranular fracture.

  • mechanical behavior of Zirconium Diboride silicon carbide boron carbide ceramics up to 2200 c
    Journal of The European Ceramic Society, 2015
    Co-Authors: Eric W Neuman, Gregory E Hilmas, William G Fahrenholtz
    Abstract:

    Abstract The mechanical properties of hot pressed Zirconium Diboride–silicon carbide–boron carbide (ZrB2–SiC–B4C) ceramics were characterized from room temperature up to 2200 °C in an argon atmosphere. The average ZrB2 grain size was 3.0 μm. The SiC particles segregated into clusters, and the largest clusters were >30 μm in diameter. The room temperature flexural strength was 700 MPa, decreasing to 540 MPa at 1800 °C and to 260 MPa at 2200 °C. The strength was controlled by the SiC cluster size up to 1800 °C. At higher temperatures, strength was controlled by formation of liquid phases, and precipitation of large BN and B–O–C–N inclusions. The mechanical behavior of these materials changes at ∼1800 °C, meaning that extrapolation of properties from lower temperatures is not accurate. Mechanical behavior in the ultra-high temperature regime was dominated by impurities and changes in microstructure. Therefore, the use of higher purity materials could lead to significant improvements in ultra-high temperature strength.

  • mechanical behavior of Zirconium Diboride silicon carbide ceramics at elevated temperature in air
    Journal of The European Ceramic Society, 2013
    Co-Authors: Eric W Neuman, Gregory E Hilmas, William G Fahrenholtz
    Abstract:

    Abstract The mechanical properties of Zirconium Diboride–silicon carbide (ZrB2–SiC) ceramics were characterized from room temperature up to 1600 °C in air. ZrB2 containing nominally 30 vol% SiC was hot pressed to full density at 1950 °C using B4C as a sintering aid. After hot pressing, the composition was determined to be 68.5 vol% ZrB2, 29.5 vol% SiC, and 2.0 vol% B4C using image analysis. The average ZrB2 grain size was 1.9 μm. The average SiC particles size was 1.2 μm, but the SiC particles formed larger clusters. The room temperature flexural strength was 680 MPa and strength increased to 750 MPa at 800 °C. Strength decreased to ∼360 MPa at 1500 °C and 1600 °C. The elastic modulus at room temperature was 510 GPa. Modulus decreased nearly linearly with temperature to 210 GPa at 1500 °C, with a more rapid decrease to 110 GPa at 1600 °C. The fracture toughness was 3.6 MPa·m½ at room temperature, increased to 4.8 MPa·m½ at 800 °C, and then decreased linearly to 3.3 MPa·m½ at 1600 °C. The strength was controlled by the SiC cluster size up to 1000 °C, and oxidation damage above 1200 °C.

Gregory E Hilmas - One of the best experts on this subject based on the ideXlab platform.

  • effect of tantalum solid solution additions on the mechanical behavior of zrb2
    Journal of The European Ceramic Society, 2020
    Co-Authors: Anna N Dorner, Gregory E Hilmas, Katharina Werbach, William G Fahrenholtz
    Abstract:

    Abstract Mechanical properties and microstructure were compared for Zirconium Diboride and two Zirconium Diboride solid solutions containing 3 and 6 at% tantalum Diboride. X-ray diffraction indicated that the ceramics were nearly phase-pure and that tantalum dissolved into the ZrB2 lattice to form (Zr,Ta)B2 solid solutions. Microstructural analysis indicated that samples achieved nearly full relative density with average grain sizes that ranged from 3−5 μm. The three compositions had similar values of Young’s modulus (510−531 GPa), shear modulus (225−228 GPa), Vickers hardness (15.2–16.4 GPa), and flexural strength (391−452 MPa). Fracture toughness ranged from 2.6 to 3.7 MPa m1/2 and with increasing tantalum content, the fracture mode changed from predominantly intergranular to predominantly transgranular. Diboride solid solution materials had comparable properties to the single metal Diboride, but differences in microstructure, secondary phases, and strain state among the three ceramics partially obscured the actual effects of the solid solution on fracture behavior.

  • mechanical properties and grain orientation evolution of Zirconium Diboride Zirconium carbide ceramics
    Journal of The European Ceramic Society, 2018
    Co-Authors: Andrea Dangio, Ji Zou, Jon G P Binner, Gregory E Hilmas, William G Fahrenholtz
    Abstract:

    Abstract The effect of ZrC on the mechanical response of ZrB 2 ceramics has been evaluated from room temperature to 2000 °C. Zirconium Diboride ceramics containing 10 vol% ZrC had higher strengths at all temperatures compared to previous reports for nominally pure ZrB 2 . The addition of ZrC also increased fracture toughness from ∼ 3 .5 MPa m for nominally pure ZrB 2 to ∼ 4 .3 MPa m due to residual thermal stresses. The toughness was comparable with ZrB 2 up to 1600 °C, but increased to 4 .6 MPa m at 1800 °C and 2000 °C. The increased toughness above 1600 °C was attributed to plasticity in the ZrC at elevated temperatures. Electron back-scattered diffraction analysis showed strong orientation of the ZrC grains along the [001] direction in the tensile region of specimens tested at 2000 °C, a phenomenon that has not been observed previously for fast fracture (crosshead displacement rate = 4.0 mm min −1 ) in four point bending. It is believed that microstructural changes and plasticity at elevated temperature were the mechanisms behind the ultrafast reorientation of ZrC.

  • processing microstructure and mechanical properties of Zirconium Diboride boron carbide ceramics
    Ceramics International, 2017
    Co-Authors: Eric W Neuman, Gregory E Hilmas, William G Fahrenholtz
    Abstract:

    The processing, microstructure, and mechanical properties of Zirconium Diboride-boron carbide (ZrB2-B4C) ceramics were characterized. Ceramics containing nominally 5, 10, 20, 30, and 40 vol% B4C were hot-pressed to full density at 1900 °C. The ZrB2 grain size decreased from 4 to 2 µm and B4C inclusion size increased from 3 to 5 µm for B4C additions of 5 and 40 vol% B4C, respectively. Elastic modulus decreased from 525 to 515 GPa and Vickers hardness increased from 15 to 21 GPa as the B4C content increased from 5 to 40 vol%, respectively, following trends predicted using linear rules of mixtures. Flexure strength and fracture toughness both increased with increasing B4C content. Fracture toughness increased from 4.1 MPa m½ at 5 vol% B4C to 5.3 MPa m½ at 40 vol% B4C additions. Flexure strength was 450 MPa with a 5 vol% B4C addition, increasing to 590 MPa for a 40 vol% addition. The critical flaw size was calculated to be ~30 µm for all compositions, and analysis of the fracture surfaces indicated that strength was controlled by edge flaws generated by machining induced sub-surface damage. Increasing amounts of B4C added to ZrB2 led to increasing hardness due to the higher hardness of B4C compared to ZrB2 and increased crack deflection. Additions of B4C also lead to increases in fracture toughness due to increased crack deflection and intergranular fracture.

  • mechanical behavior of Zirconium Diboride silicon carbide boron carbide ceramics up to 2200 c
    Journal of The European Ceramic Society, 2015
    Co-Authors: Eric W Neuman, Gregory E Hilmas, William G Fahrenholtz
    Abstract:

    Abstract The mechanical properties of hot pressed Zirconium Diboride–silicon carbide–boron carbide (ZrB2–SiC–B4C) ceramics were characterized from room temperature up to 2200 °C in an argon atmosphere. The average ZrB2 grain size was 3.0 μm. The SiC particles segregated into clusters, and the largest clusters were >30 μm in diameter. The room temperature flexural strength was 700 MPa, decreasing to 540 MPa at 1800 °C and to 260 MPa at 2200 °C. The strength was controlled by the SiC cluster size up to 1800 °C. At higher temperatures, strength was controlled by formation of liquid phases, and precipitation of large BN and B–O–C–N inclusions. The mechanical behavior of these materials changes at ∼1800 °C, meaning that extrapolation of properties from lower temperatures is not accurate. Mechanical behavior in the ultra-high temperature regime was dominated by impurities and changes in microstructure. Therefore, the use of higher purity materials could lead to significant improvements in ultra-high temperature strength.

  • mechanical behavior of Zirconium Diboride silicon carbide ceramics at elevated temperature in air
    Journal of The European Ceramic Society, 2013
    Co-Authors: Eric W Neuman, Gregory E Hilmas, William G Fahrenholtz
    Abstract:

    Abstract The mechanical properties of Zirconium Diboride–silicon carbide (ZrB2–SiC) ceramics were characterized from room temperature up to 1600 °C in air. ZrB2 containing nominally 30 vol% SiC was hot pressed to full density at 1950 °C using B4C as a sintering aid. After hot pressing, the composition was determined to be 68.5 vol% ZrB2, 29.5 vol% SiC, and 2.0 vol% B4C using image analysis. The average ZrB2 grain size was 1.9 μm. The average SiC particles size was 1.2 μm, but the SiC particles formed larger clusters. The room temperature flexural strength was 680 MPa and strength increased to 750 MPa at 800 °C. Strength decreased to ∼360 MPa at 1500 °C and 1600 °C. The elastic modulus at room temperature was 510 GPa. Modulus decreased nearly linearly with temperature to 210 GPa at 1500 °C, with a more rapid decrease to 110 GPa at 1600 °C. The fracture toughness was 3.6 MPa·m½ at room temperature, increased to 4.8 MPa·m½ at 800 °C, and then decreased linearly to 3.3 MPa·m½ at 1600 °C. The strength was controlled by the SiC cluster size up to 1000 °C, and oxidation damage above 1200 °C.

Zhao-zhu Zhang - One of the best experts on this subject based on the ideXlab platform.

  • effect of zrb2 particles incorporation on high temperature tribological properties of hybrid ptfe nomex fabric phenolic composite
    Tribology International, 2016
    Co-Authors: Mingming Yang, Junya Yuan, Zhao-zhu Zhang
    Abstract:

    Abstract The thermal stability of polymer matrix composite could effectively improve by incorporation of highly thermally conductive ceramic materials into polymers. In present work, hybrid PTFE/Nomex fabric/phenolic composite specimens were prepared with Zirconium Diboride (ZrB 2 ) particles for the improvement its high-temperature tribological performances. The thermal stability of hybrid PTFE/Nomex fabric/phenolic composite was investigated by TGA. The result showed that the thermal stability was improved because of addition of ZrB 2 particles. In addition, it was found that 9 wt% ZrB 2 reinforced hybrid PTFE/Nomex fabric/phenolic composite exhibited optimal tribological performances compared to unfilled fabric composite under all test conditions.

  • effect of zrb2 particles incorporation on high temperature tribological properties of hybrid ptfe nomex fabric phenolic composite
    Tribology International, 2016
    Co-Authors: Mingming Yang, Junya Yuan, Zhao-zhu Zhang
    Abstract:

    Abstract The thermal stability of polymer matrix composite could effectively improve by incorporation of highly thermally conductive ceramic materials into polymers. In present work, hybrid PTFE/Nomex fabric/phenolic composite specimens were prepared with Zirconium Diboride (ZrB 2 ) particles for the improvement its high-temperature tribological performances. The thermal stability of hybrid PTFE/Nomex fabric/phenolic composite was investigated by TGA. The result showed that the thermal stability was improved because of addition of ZrB 2 particles. In addition, it was found that 9 wt% ZrB 2 reinforced hybrid PTFE/Nomex fabric/phenolic composite exhibited optimal tribological performances compared to unfilled fabric composite under all test conditions.

Jiecai Han - One of the best experts on this subject based on the ideXlab platform.

  • Electrostatic Assembly Preparation of High-Toughness Zirconium Diboride-Based Ceramic Composites with Enhanced Thermal Shock Resistance Performance
    2016
    Co-Authors: Baoxi Zhang, Changqing Hong, Jia Zhang, Xinghong Zhang, Yunfeng Qiu, Jiecai Han
    Abstract:

    The central problem of using ceramic as a structural material is its brittleness, which associated with rigid covalent or ionic bonds. Whiskers or fibers of strong ceramics such as silicon carbide (SiC) or silicon nitride (Si3N4) are widely embedded in a ceramic matrix to improve the strength and toughness. The incorporation of these insulating fillers can impede the thermal flow in ceramic matrix, thus decrease its thermal shock resistance that is required in some practical applications. Here we demonstrate that the toughness and thermal shock resistance of Zirconium Diboride (ZrB2)/SiC composites can be improved simultaneously by introducing graphene into composites via electrostatic assembly and subsequent sintering treatment. The incorporated graphene creates weak interfaces of grain boundaries (GBs) and optimal thermal conductance paths inside composites. In comparison to pristine ZrB2–SiC composites, the toughness of (2.0%) ZrB2–SiC/graphene composites exhibited a 61% increasing (from 4.3 to 6.93 MPa·m1/2) after spark plasma sintering (SPS); the retained strength after thermal shock increased as high as 74.8% at 400 °C and 304.4% at 500 °C. Present work presents an important guideline for producing high-toughness ceramic-based composites with enhanced thermal shock properties

  • microstructural feature and thermal shock behavior of hot pressed zrb2 sic zro2 composite
    Materials Chemistry and Physics, 2009
    Co-Authors: Dejiang Chen, Changqing Hong, Xinghong Zhang, Jiecai Han, Wenbo Han
    Abstract:

    Abstract This paper investigated the thermal shock behavior of hot-pressed Zirconium Diboride (ZrB2–10 vol%SiC–10 vol%ZrO2) composite by means of water quenching. Under single thermal shock, the retained strength presented sharp degradation with the temperature difference (ΔT) above 500 °C. Differently, the retained strength decreased rapidly with ΔT above 300 °C under five-cycle thermal shock. Analysis of the microstructural features also showed discrepancy for the composite under different thermal shock conditions. Further discussion found that the thermal shock resistance of ZrB2–SiC–ZrO2 composite was influenced by the intrinsic properties as well as the oxidation behavior under high temperature.

  • microstructure and properties of silicon carbide whisker reinforced Zirconium Diboride ultra high temperature ceramics
    Solid State Sciences, 2009
    Co-Authors: Xinghong Zhang, Wenbo Han, Ling Weng, Jiecai Han
    Abstract:

    Abstract Hot-pressed Zirconium Diboride (ZrB 2 ) matrix composites containing 0–30 vol% silicon carbide (SiC) whiskers have been investigated to determine the effect of composition (i.e. amount of SiC whiskers) on the microstructure, mechanical properties and thermal properties. With increasing SiC whisker volume contents, the flexural strength and fracture toughness of the composites were improved compared to those of monolithic ZrB 2 . Flexural strength increased from 629 MPa for pure ZrB 2 to 767 MPa for ZrB 2 –30 vol%SiCw. Likewise, fracture toughness ranged from 5.4 to 7.1 MPa m 1/2 over the same composition range. Specific heat capacity increased with SiC whisker addition, while thermal diffusivity and thermal conductivity decreased slightly with the increase of SiC whisker content.

  • Crack-healing behavior of Zirconium Diboride composite reinforced with silicon carbide whiskers
    Scripta Materialia, 2008
    Co-Authors: Xinghong Zhang, Wenbo Han, Jiecai Han
    Abstract:

    The crack-healing behavior of Zirconium Diboride ceramic composite reinforced with silicon carbide whiskers has been investigated through pre-cracking, crack-healing and flexural strength testing processes. A Vickers indentation (∼70 μm in size) was introduced and the crack was healed under different conditions. Cracks could heal completely in air, but did not heal in a vacuum. This composite has good self crack-healing ability at temperatures ranging from 800 to 1200 °C, with 1000 °C being the optimum healing temperature.

  • oxidation behavior of Zirconium Diboride silicon carbide at 1800 c
    Scripta Materialia, 2007
    Co-Authors: Jiecai Han, Xinghong Zhang, Songhe Meng
    Abstract:

    ZrB2-based ultrahigh-temperature ceramics, including 20 and 30 vol.% SiC, have been investigated at 1800 °C under different oxygen partial pressures. ZrB2–30 vol.% SiC exhibited the highest oxidation resistance under high oxygen partial pressure, whereas it displayed the lowest oxidation resistance under low oxygen partial pressure. The thickness of the oxide scale of ZrB2 containing either 20 or 30 vol.% SiC increased with decreasing oxygen partial pressure. Moreover, this trend was intensified by increasing the SiC content.

Xinghong Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Electrostatic Assembly Preparation of High-Toughness Zirconium Diboride-Based Ceramic Composites with Enhanced Thermal Shock Resistance Performance
    2016
    Co-Authors: Baoxi Zhang, Changqing Hong, Jia Zhang, Xinghong Zhang, Yunfeng Qiu, Jiecai Han
    Abstract:

    The central problem of using ceramic as a structural material is its brittleness, which associated with rigid covalent or ionic bonds. Whiskers or fibers of strong ceramics such as silicon carbide (SiC) or silicon nitride (Si3N4) are widely embedded in a ceramic matrix to improve the strength and toughness. The incorporation of these insulating fillers can impede the thermal flow in ceramic matrix, thus decrease its thermal shock resistance that is required in some practical applications. Here we demonstrate that the toughness and thermal shock resistance of Zirconium Diboride (ZrB2)/SiC composites can be improved simultaneously by introducing graphene into composites via electrostatic assembly and subsequent sintering treatment. The incorporated graphene creates weak interfaces of grain boundaries (GBs) and optimal thermal conductance paths inside composites. In comparison to pristine ZrB2–SiC composites, the toughness of (2.0%) ZrB2–SiC/graphene composites exhibited a 61% increasing (from 4.3 to 6.93 MPa·m1/2) after spark plasma sintering (SPS); the retained strength after thermal shock increased as high as 74.8% at 400 °C and 304.4% at 500 °C. Present work presents an important guideline for producing high-toughness ceramic-based composites with enhanced thermal shock properties

  • microstructural feature and thermal shock behavior of hot pressed zrb2 sic zro2 composite
    Materials Chemistry and Physics, 2009
    Co-Authors: Dejiang Chen, Changqing Hong, Xinghong Zhang, Jiecai Han, Wenbo Han
    Abstract:

    Abstract This paper investigated the thermal shock behavior of hot-pressed Zirconium Diboride (ZrB2–10 vol%SiC–10 vol%ZrO2) composite by means of water quenching. Under single thermal shock, the retained strength presented sharp degradation with the temperature difference (ΔT) above 500 °C. Differently, the retained strength decreased rapidly with ΔT above 300 °C under five-cycle thermal shock. Analysis of the microstructural features also showed discrepancy for the composite under different thermal shock conditions. Further discussion found that the thermal shock resistance of ZrB2–SiC–ZrO2 composite was influenced by the intrinsic properties as well as the oxidation behavior under high temperature.

  • microstructure and properties of silicon carbide whisker reinforced Zirconium Diboride ultra high temperature ceramics
    Solid State Sciences, 2009
    Co-Authors: Xinghong Zhang, Wenbo Han, Ling Weng, Jiecai Han
    Abstract:

    Abstract Hot-pressed Zirconium Diboride (ZrB 2 ) matrix composites containing 0–30 vol% silicon carbide (SiC) whiskers have been investigated to determine the effect of composition (i.e. amount of SiC whiskers) on the microstructure, mechanical properties and thermal properties. With increasing SiC whisker volume contents, the flexural strength and fracture toughness of the composites were improved compared to those of monolithic ZrB 2 . Flexural strength increased from 629 MPa for pure ZrB 2 to 767 MPa for ZrB 2 –30 vol%SiCw. Likewise, fracture toughness ranged from 5.4 to 7.1 MPa m 1/2 over the same composition range. Specific heat capacity increased with SiC whisker addition, while thermal diffusivity and thermal conductivity decreased slightly with the increase of SiC whisker content.

  • processing and mechanical properties of short carbon fibers toughened Zirconium Diboride based ceramics
    Materials & Design, 2008
    Co-Authors: Feiyu Yang, Xinghong Zhang, Shanyi Du
    Abstract:

    Abstract The major problems associated with Zirconium Diboride-based ceramics are lack of damage tolerance as structure components, so ZrB2/20 vol% SiC based ceramics toughened by 20 vol% short carbon fibers were produced by hot pressing at 2000 °C under 30 MPa for 1 h. SEM results showed that short carbon fibers could disperse uniformly in powder mixtures and sintered sample through milling. Three-point bend strength and fracture toughness were measured. The decrease in strength from 448 MPa to 397 MPa as the addition of short fibers was attributed to the chemical reaction between fiber and matrix. The fracture toughness increased from 4.25 MPa m1/2 for ZrB2/SiC to 6.35 MPa m1/2 for short fibers toughened ZrB2/SiC, which was led by the crack deflection and fiber fracture.

  • Crack-healing behavior of Zirconium Diboride composite reinforced with silicon carbide whiskers
    Scripta Materialia, 2008
    Co-Authors: Xinghong Zhang, Wenbo Han, Jiecai Han
    Abstract:

    The crack-healing behavior of Zirconium Diboride ceramic composite reinforced with silicon carbide whiskers has been investigated through pre-cracking, crack-healing and flexural strength testing processes. A Vickers indentation (∼70 μm in size) was introduced and the crack was healed under different conditions. Cracks could heal completely in air, but did not heal in a vacuum. This composite has good self crack-healing ability at temperatures ranging from 800 to 1200 °C, with 1000 °C being the optimum healing temperature.

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