Spark Plasma Sintering

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Hidehiro Yoshida - One of the best experts on this subject based on the ideXlab platform.

  • Fabrication of Transparent Yttria by High‐Pressure Spark Plasma Sintering
    Journal of the American Ceramic Society, 2011
    Co-Authors: Haibin Zhang, Koji Morita, Keijiro Hiraga, Hidehiro Yoshida, Yoshio Sakka
    Abstract:

    Transparent yttria was prepared by means of high-pressure Spark Plasma Sintering at 1050°C under the uniaxial pressure of 300 MPa. The resulting yttria possessed the in-line transmittance of 68% at the wavelength of 700 nm and the nanometric grains of about 400 nm. In the near-infrared spectral region, the transparency of the present specimen approached the level of single crystal yttria. This research highlighted the efficiency and simplicity of high-pressure Spark Plasma Sintering for fabricating transparent yttria.

  • Fabrication of transparent yttria by high-pressure Spark Plasma Sintering
    Journal of the American Ceramic Society, 2011
    Co-Authors: Haibin Zhang, Byung Nam Kim, Koji Morita, Keijiro Hiraga, Hidehiro Yoshida, Yoshio Sakka
    Abstract:

    Transparent yttria was prepared by means of high-pressure Spark Plasma Sintering at 1050°C under the uniaxial pressure of 300 MPa. The resulting yttria possessed the in-line transmittance of 68% at the wavelength of 700 nm and the nanometric grains of about 400 nm. In the near-infrared spectral region, the transparency of the present specimen approached the level of single crystal yttria. This research highlighted the efficiency and simplicity of high-pressure Spark Plasma Sintering for fabricating transparent yttria.

  • Spark Plasma Sintering of transparent alumina
    Scripta Materialia, 2007
    Co-Authors: Keijiro Hiraga, Koji Morita, Hidehiro Yoshida
    Abstract:

    Transparent alumina with a fine grain size (0.27 μm) was obtained by controlling the heating rate during Spark Plasma Sintering processing. The alumina sintered at 1150 °C with a heating rate of 8 °C/min has a residual porosity of 0.03% and an in-line transmission of 47% for a wavelength of 640 nm. We show that a low heating rate has an effect on the densification and transparency of alumina for Sintering at 1150 °C.

  • Spark Plasma Sintering of transparent alumina
    Scripta Materialia, 2007
    Co-Authors: Byung Nam Kim, Koji Morita, Keijiro Hiraga, Hidehiro Yoshida
    Abstract:

    Transparent alumina with a fine grain size (0.27 ??m) was obtained by controlling the heating rate during Spark Plasma Sintering processing. The alumina sintered at 1150 ??C with a heating rate of 8 ??C/min has a residual porosity of 0.03% and an in-line transmission of 47% for a wavelength of 640 nm. We show that a low heating rate has an effect on the densification and transparency of alumina for Sintering at 1150 ??C. ?? 2007 Acta Materialia Inc.

Eugene A. Olevsky - One of the best experts on this subject based on the ideXlab platform.

  • Flash (Ultra-Rapid) Spark-Plasma Sintering of Silicon Carbide.
    Scientific Reports, 2016
    Co-Authors: Eugene A. Olevsky, Stephen M. Rolfing, Andrey L. Maximenko
    Abstract:

    A new ultra-rapid process of flash Spark Plasma Sintering is developed. The idea of flash Spark Plasma Sintering (or flash hot pressing - FHP) stems from the conducted theoretical analysis of the role of thermal runaway phenomena for material processing by flash Sintering. The major purpose of the present study is to theoretically analyze the thermal runaway nature of flash Sintering and to experimentally address the challenge of uncontrollable thermal conditions by the stabilization of the flash Sintering process through the application of the external pressure. The effectiveness of the developed FHP technique is demonstrated by the few seconds–long consolidation of SiC powder in an industrial Spark Plasma Sintering device. Specially designed sacrificial dies heat the pre-compacted SiC powder specimens to a critical temperature before applying any voltage to the powder volume and allowing the electrode-punches of the SPS device setup to contact the specimens and pass electric current through them under elevated temperatures. The experimental results demonstrate that flash Sintering phenomena can be realized using conventional SPS devices. The usage of hybrid heating SPS devices is pointed out as the mainstream direction for the future studies and utilization of the new flash hot pressing (ultra-rapid Spark Plasma Sintering) technique.

  • Flash (Ultra-Rapid) Spark-Plasma Sintering of Silicon Carbide
    Scientific Reports, 2016
    Co-Authors: Eugene A. Olevsky, Stephen M. Rolfing, Andrey L. Maximenko
    Abstract:

    A new ultra-rapid process of flash Spark Plasma Sintering is developed. The idea of flash Spark Plasma Sintering (or flash hot pressing -FHP) stems from the conducted theoretical analysis of the role of thermal runaway phenomena for material processing by flash Sintering. The major purpose of the present study is to theoretically analyze the thermal runaway nature of flash Sintering and to experimentally address the challenge of uncontrollable thermal conditions by the stabilization of the flash Sintering process through the application of the external pressure. The effectiveness of the developed FHP technique is demonstrated by the few seconds–long consolidation of SiC powder in an industrial Spark Plasma Sintering device. Specially designed sacrificial dies heat the pre-compacted SiC powder specimens to a critical temperature before applying any voltage to the powder volume and allowing the electrode-punches of the SPS device setup to contact the specimens and pass electric current through them under elevated temperatures. The experimental results demonstrate that flash Sintering phenomena can be realized using conventional SPS devices. The usage of hybrid heating SPS devices is pointed out as the mainstream direction for the future studies and utilization of the new flash hot pressing (ultra-rapid Spark Plasma Sintering) technique. Electromagnetic field-assisted Sintering techniques have increasingly attracted attention of scientists and tech-nologists over the course of the last decade 1–14 . Spark-Plasma Sintering (SPS) is a particular kind of field-assisted Sintering, which significantly shortens processing of powder materials and improves the powder consolidation performance in terms of both time and quality. It is especially promising with regard to maintaining the nano and sub-micron structure in nano-powder-based materials after consolidation. SPS gains particular prominence in connection with its unique capabilities of processing very hard-to-deform materials, which would typically require lengthy consolidation times at significantly elevated temperatures under conditions of conventional pow-der pressing or Sintering. Another field-assisted phenomenon -the " flash Sintering " 15–34

  • Modeling residual porosity in thick components consolidated by Spark Plasma Sintering
    Scripta Materialia, 2014
    Co-Authors: J. Milligan, Eugene A. Olevsky, P. Hendrickx, Mehmet Masum Tünçay, Mathieu Brochu
    Abstract:

    A constitutive model for densification during Spark Plasma Sintering was adapted and applied to an aluminum–magnesium alloy to determine the effect of increasing sample thickness on residual porosity after Sintering. The contributions of electromigration, Sintering stresses and external load (on creep, diffusion and yielding) were all taken into consideration, as well as the effect of pressure on increasingly thick components. The results show that the overall description of the Spark Plasma Sintering process agrees with the experimental results.

  • Numerical Simulation of Spark Plasma Sintering
    Advances in Science and Technology, 2010
    Co-Authors: Cristina García, Eugene A. Olevsky
    Abstract:

    A macro-scale model of Spark Plasma Sintering (SPS) that couples electrical, thermal, stress-strain and densification components is presented. The continuum theory of Sintering is incorporated enabling the evolution of the densification based on local conditions, thus a true spatial density distribution could be obtained. Specimen behavior is described through a non-linear viscous constitutive relation. The simulation is based on an FEM computer code. Several examples are shown and results are compared with experimental data available.

  • Spark Plasma Sintering of tantalum carbide
    Scripta Materialia, 2010
    Co-Authors: Evan Khaleghi, M A Meyers, Eugene A. Olevsky
    Abstract:

    A tantalum carbide powder was consolidated by Spark Plasma Sintering. The specimens were processed under various temperature and pressure conditions and characterized in terms of relative density, grain size, rupture strength and hardness. The results are compared to hot pressing conducted under similar settings. It is shown that high densification is accompanied by substantial grain growth. Carbon nanotubes were added to mitigate grain growth; however, while increasing specimens’ rupture strength and final density, they had little effect on grain growth.

Keijiro Hiraga - One of the best experts on this subject based on the ideXlab platform.

  • Fabrication of Transparent Yttria by High‐Pressure Spark Plasma Sintering
    Journal of the American Ceramic Society, 2011
    Co-Authors: Haibin Zhang, Koji Morita, Keijiro Hiraga, Hidehiro Yoshida, Yoshio Sakka
    Abstract:

    Transparent yttria was prepared by means of high-pressure Spark Plasma Sintering at 1050°C under the uniaxial pressure of 300 MPa. The resulting yttria possessed the in-line transmittance of 68% at the wavelength of 700 nm and the nanometric grains of about 400 nm. In the near-infrared spectral region, the transparency of the present specimen approached the level of single crystal yttria. This research highlighted the efficiency and simplicity of high-pressure Spark Plasma Sintering for fabricating transparent yttria.

  • Fabrication of transparent yttria by high-pressure Spark Plasma Sintering
    Journal of the American Ceramic Society, 2011
    Co-Authors: Haibin Zhang, Byung Nam Kim, Koji Morita, Keijiro Hiraga, Hidehiro Yoshida, Yoshio Sakka
    Abstract:

    Transparent yttria was prepared by means of high-pressure Spark Plasma Sintering at 1050°C under the uniaxial pressure of 300 MPa. The resulting yttria possessed the in-line transmittance of 68% at the wavelength of 700 nm and the nanometric grains of about 400 nm. In the near-infrared spectral region, the transparency of the present specimen approached the level of single crystal yttria. This research highlighted the efficiency and simplicity of high-pressure Spark Plasma Sintering for fabricating transparent yttria.

  • Spark Plasma Sintering of transparent alumina
    Scripta Materialia, 2007
    Co-Authors: Keijiro Hiraga, Koji Morita, Hidehiro Yoshida
    Abstract:

    Transparent alumina with a fine grain size (0.27 μm) was obtained by controlling the heating rate during Spark Plasma Sintering processing. The alumina sintered at 1150 °C with a heating rate of 8 °C/min has a residual porosity of 0.03% and an in-line transmission of 47% for a wavelength of 640 nm. We show that a low heating rate has an effect on the densification and transparency of alumina for Sintering at 1150 °C.

  • Spark Plasma Sintering of transparent alumina
    Scripta Materialia, 2007
    Co-Authors: Byung Nam Kim, Koji Morita, Keijiro Hiraga, Hidehiro Yoshida
    Abstract:

    Transparent alumina with a fine grain size (0.27 ??m) was obtained by controlling the heating rate during Spark Plasma Sintering processing. The alumina sintered at 1150 ??C with a heating rate of 8 ??C/min has a residual porosity of 0.03% and an in-line transmission of 47% for a wavelength of 640 nm. We show that a low heating rate has an effect on the densification and transparency of alumina for Sintering at 1150 ??C. ?? 2007 Acta Materialia Inc.

Khiam Aik Khor - One of the best experts on this subject based on the ideXlab platform.

  • Spark Plasma Sintering of tini nano powder
    Scripta Materialia, 2005
    Co-Authors: Christopher Shearwood, Y. Q. Fu, L. G. Yu, Khiam Aik Khor
    Abstract:

    Spark Plasma Sintering of Ti50Ni50 nano-powder at a temperature of 800 °C produced specimens showing good shape memory effect and density. Below this temperature, specimens have high porosity but with apparent shape memory effect. By contrast, the specimens sintered at higher temperatures have bulk density, but experienced extensive oxidation with the resulting loss of the shape memory effect.

  • Spark Plasma Sintering of TiNi nano-powder
    Scripta Materialia, 2005
    Co-Authors: Christopher Shearwood, Y. Q. Fu, L. G. Yu, Li Yu, Khiam Aik Khor
    Abstract:

    Spark Plasma Sintering of Ti50Ni50 nano-powder at a temperature of 800°C produced specimens showing good shape memory effect and density. Below this temperature, specimens have high porosity but with apparent shape memory effect. By contrast, the specimens sintered at higher temperatures have bulk density, but experienced extensive oxidation with the resulting loss of the shape memory effect. © 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

  • Spark Plasma Sintering of hydroxyapatite powders
    Biomaterials, 2002
    Co-Authors: Y W Gu, N.h. Loh, Shu Beng Tor, Khiam Aik Khor, Philip Cheang
    Abstract:

    Dense hydroxyapatite (HA) compacts have been successfully fabricated by a Spark Plasma Sintering (SPS). The Sintering behavior of HA powders at different temperatures ranging from 850°C to 1100°C was studied. Results showed that Spark Plasma Sintering resulted in rapid densification to near theoretical density. The HA compact was homogeneously sintered at 950°C in a short Sintering duration of 5min, while maintaining high quality and high relative density (>99.5%). The density, microhardness and Young's modulus of HA sintered compact initially increased with the Sintering temperature, reached a maximum value at around 950-1000°C, then decreased with further increase in the temperature due to the decomposition of HA into β-tricalcium phosphates. Fracture toughness results showed no significant difference with increasing temperature due to the combined influences of density and grain size. Microstructure analysis showed no noticeable grain growth under different Sintering temperatures due to the short time exposure at high temperatures. Copyright © 2001 Elsevier Science Ltd.

  • Spark Plasma Sintering of hydroxyapatite powders
    Biomaterials, 2002
    Co-Authors: Y W Gu, Khiam Aik Khor, Philip Cheang
    Abstract:

    Dense hydroxyapatite (HA) compacts have been successfully fabricated by a Spark Plasma Sintering (SPS). The Sintering behavior of HA powders at different temperatures ranging from 8508C to 11008C was studied. Results showed that Spark Plasma Sintering resulted in rapid densification to near theoretical density. The HA compact was homogeneously sintered at 9508C in a short Sintering duration of 5 min, while maintaining high quality and high relative density (>99.5%). The density, microhardness and Young’s modulus of HA sintered compact initially increased with the Sintering temperature, reached a maximum value at around 950– 10008C, then decreased with further increase in the temperature due to the decomposition of HA into b-tricalcium phosphates. Fracture toughness results showed no significant difference with increasing temperature due to the combined influences of density and grain size. Microstructure analysis showed no noticeable grain growth under different Sintering temperatures due to the short time exposure at high temperatures. # 2001 Elsevier Science Ltd. All rights reserved.

Koji Morita - One of the best experts on this subject based on the ideXlab platform.

  • Fabrication of Transparent Yttria by High‐Pressure Spark Plasma Sintering
    Journal of the American Ceramic Society, 2011
    Co-Authors: Haibin Zhang, Koji Morita, Keijiro Hiraga, Hidehiro Yoshida, Yoshio Sakka
    Abstract:

    Transparent yttria was prepared by means of high-pressure Spark Plasma Sintering at 1050°C under the uniaxial pressure of 300 MPa. The resulting yttria possessed the in-line transmittance of 68% at the wavelength of 700 nm and the nanometric grains of about 400 nm. In the near-infrared spectral region, the transparency of the present specimen approached the level of single crystal yttria. This research highlighted the efficiency and simplicity of high-pressure Spark Plasma Sintering for fabricating transparent yttria.

  • Fabrication of transparent yttria by high-pressure Spark Plasma Sintering
    Journal of the American Ceramic Society, 2011
    Co-Authors: Haibin Zhang, Byung Nam Kim, Koji Morita, Keijiro Hiraga, Hidehiro Yoshida, Yoshio Sakka
    Abstract:

    Transparent yttria was prepared by means of high-pressure Spark Plasma Sintering at 1050°C under the uniaxial pressure of 300 MPa. The resulting yttria possessed the in-line transmittance of 68% at the wavelength of 700 nm and the nanometric grains of about 400 nm. In the near-infrared spectral region, the transparency of the present specimen approached the level of single crystal yttria. This research highlighted the efficiency and simplicity of high-pressure Spark Plasma Sintering for fabricating transparent yttria.

  • Spark Plasma Sintering of transparent alumina
    Scripta Materialia, 2007
    Co-Authors: Keijiro Hiraga, Koji Morita, Hidehiro Yoshida
    Abstract:

    Transparent alumina with a fine grain size (0.27 μm) was obtained by controlling the heating rate during Spark Plasma Sintering processing. The alumina sintered at 1150 °C with a heating rate of 8 °C/min has a residual porosity of 0.03% and an in-line transmission of 47% for a wavelength of 640 nm. We show that a low heating rate has an effect on the densification and transparency of alumina for Sintering at 1150 °C.

  • Spark Plasma Sintering of transparent alumina
    Scripta Materialia, 2007
    Co-Authors: Byung Nam Kim, Koji Morita, Keijiro Hiraga, Hidehiro Yoshida
    Abstract:

    Transparent alumina with a fine grain size (0.27 ??m) was obtained by controlling the heating rate during Spark Plasma Sintering processing. The alumina sintered at 1150 ??C with a heating rate of 8 ??C/min has a residual porosity of 0.03% and an in-line transmission of 47% for a wavelength of 640 nm. We show that a low heating rate has an effect on the densification and transparency of alumina for Sintering at 1150 ??C. ?? 2007 Acta Materialia Inc.