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Xuefeng Zhang - One of the best experts on this subject based on the ideXlab platform.
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Effect of SiO2/MgO ratio on the crystallization behavior, structure, and properties of wollastonite-Augite glass-ceramics derived from stainless steel slag
Materials Chemistry and Physics, 2020Co-Authors: Leibo Deng, Xiaolin Jia, Yu Shi, Fei Yun, Ruidong Jia, Xuefeng ZhangAbstract:Abstract Wollastonite-Augite glass-ceramics of the CaO–SiO2–Al2O3–MgO system were prepared from stainless steel slag as the main raw material. The effects of SiO2/MgO mass ratio on the crystallization behavior, crystalline phases, structure, and properties of the as-prepared stainless steel slag glass-ceramics were investigated by differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and physicochemical property measurements. The results showed that with decreasing SiO2/MgO ratio, the crystallization activation energies of the samples decreased from 436.48 kJ/mol to 383.84 kJ/mol, and their crystallization indexes increased from 1.67 to 3.21; in addition, the Augite crystals were gradually refined and their content increased. On the other hand, the amount of elongated wollastonite crystals decreased and the crystals gradually dispersed in the Augite crystals. Furthermore, among all the prepared glass-ceramics, the one with a density of 3.08 g/cm3 exhibited the best mechanical properties with a bending strength of 176.21 MPa and microhardness of 8.81 GPa.
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effect of sio2 mgo ratio on the crystallization behavior structure and properties of wollastonite Augite glass ceramics derived from stainless steel slag
Materials Chemistry and Physics, 2020Co-Authors: Leibo Deng, Xiaolin Jia, Yu Shi, Fei Yun, Ruidong Jia, Xuefeng ZhangAbstract:Abstract Wollastonite-Augite glass-ceramics of the CaO–SiO2–Al2O3–MgO system were prepared from stainless steel slag as the main raw material. The effects of SiO2/MgO mass ratio on the crystallization behavior, crystalline phases, structure, and properties of the as-prepared stainless steel slag glass-ceramics were investigated by differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and physicochemical property measurements. The results showed that with decreasing SiO2/MgO ratio, the crystallization activation energies of the samples decreased from 436.48 kJ/mol to 383.84 kJ/mol, and their crystallization indexes increased from 1.67 to 3.21; in addition, the Augite crystals were gradually refined and their content increased. On the other hand, the amount of elongated wollastonite crystals decreased and the crystals gradually dispersed in the Augite crystals. Furthermore, among all the prepared glass-ceramics, the one with a density of 3.08 g/cm3 exhibited the best mechanical properties with a bending strength of 176.21 MPa and microhardness of 8.81 GPa.
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Lanthanum modification of crystalline phases and residual glass in Augite glass ceramics produced with industrial solid wastes
Journal of Non-Crystalline Solids, 2019Co-Authors: Hua Chen, Xuefeng Zhang, Ming Zhao, Yu Shi, John S. MccloyAbstract:Abstract The effects of La2O3 on microstructure and properties of the CaO-MgO-SiO2-Al2O3 glass ceramics, made from Bayan Obo West Mine tailing and fly ash, were investigated. Results showed that La2O3 additions up to 2 wt% promoted Augite crystallization. Above this concentration, La2O3 suppressed Augite crystallization by rather forming lanthanum oxyapatite that acted as a barrier for the growth of Augite. Also Cr ions, the key element for the Augite nuclei, were enriched in lanthanum oxyapatite. The La3+ cations were found to partially substitute for Ca2+ at the M2 structural sites in clinopyroxene (Augite). Nano crystalline clusters, containing La3+, Na+, Ca2+, Mg2+ and Fe3+ in Augite-like proportions, were found uniformly dispersed in the residual glassy phase. The glass ceramic with 2 wt% La2O3 shows optimum mechanical properties and chemical durability. The bending strength and Vickers hardness are 238 MPa and 7.57 GPa, acid and alkali-resistance are 97.5% and 98.9%, respectively.
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Pressure-induced preferential grain growth, texture development, and anisotropic properties of Fe/Augite matrix composites prepared by spark plasma sintering
Materials Research Express, 2018Co-Authors: W L Chen, Xuefeng Zhang, Xiaolin Jia, Liu YanliAbstract:Fe/Augite matrix composites were prepared by spark plasma sintering (SPS) using CaO–MgO–Al2O3–SiO2 glass-ceramic water quenched slag as the raw material and Fe2O3 and Fe-75%Si as additives. The phase compositions and microstructures of the samples were analyzed by x-ray diffraction and scanning electronic microscopy. The effect of the texture on the microstructure and mechanical properties of the Fe/Augite matrix composites was investigated. The results show that the high-density sample fabricated by SPS at 800 °C has a fiber texture along the c axis such that is parallel to the compression direction. The Fe/Augite matrix composite prepared at a sintering temperature of 800 °C has better properties than that prepared at 700 °C, with density of 3.52 g cm−3, Vickers hardness of 7.73 GPa, and fracture toughness of 12.09 M P a m 1/2.
Deepak Srivastava - One of the best experts on this subject based on the ideXlab platform.
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alternating Augite plagioclase wedges in basement dolerites of lockne impact structure sweden a new shock wave induced deformation feature
Meteoritics & Planetary Science, 2017Co-Authors: Boris Reznik, Amar Agarwal, Luis M Alvavaldivia, Deepak SrivastavaAbstract:This paper reports peculiar alternating Augite-plagioclase wedges in basement dolerites of Lockne impact structure, Sweden. The combined microscopic and spectroscopic studies of the micro/nanoscale wedges reveal that these are deformation-induced features. First, samples showing wedges, 12 out of 18 studied, are distributed in the impact structure within a radius of up to 10 km from the crater center. Second, the margins between the Augite and labradorite wedges are sharp and the {110} prismatic cleavage of Augite develops into fractures and thereafter into wedges. The fractures are filled with molten labradorite pushed from the neighboring bulk labradorite grain. Third, compared to the bulk labradorite, the dislocation density and the residual strain in the labradorite wedges are significantly higher. A possible mechanism of genesis of the wedges is proposed. The mechanism explains that passing of the shock waves in the basement dolerite induced (i) formation of microfractures in Augite and labradorite; (ii) development of the Augite prismatic cleavages into the wedges, which overprint the microfracture in the labradorite wedges; and (iii) thereafter, infilling of microfractures in the Augite wedges by labradorite.
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Alternating Augite‐plagioclase wedges in basement dolerites of Lockne impact structure, Sweden: A new shock wave‐induced deformation feature
Meteoritics & Planetary Science, 2016Co-Authors: Amar Agarwal, Boris Reznik, Luis M. Alva-valdivia, Deepak SrivastavaAbstract:This paper reports peculiar alternating Augite-plagioclase wedges in basement dolerites of Lockne impact structure, Sweden. The combined microscopic and spectroscopic studies of the micro/nanoscale wedges reveal that these are deformation-induced features. First, samples showing wedges, 12 out of 18 studied, are distributed in the impact structure within a radius of up to 10 km from the crater center. Second, the margins between the Augite and labradorite wedges are sharp and the {110} prismatic cleavage of Augite develops into fractures and thereafter into wedges. The fractures are filled with molten labradorite pushed from the neighboring bulk labradorite grain. Third, compared to the bulk labradorite, the dislocation density and the residual strain in the labradorite wedges are significantly higher. A possible mechanism of genesis of the wedges is proposed. The mechanism explains that passing of the shock waves in the basement dolerite induced (i) formation of microfractures in Augite and labradorite; (ii) development of the Augite prismatic cleavages into the wedges, which overprint the microfracture in the labradorite wedges; and (iii) thereafter, infilling of microfractures in the Augite wedges by labradorite.
Amar Agarwal - One of the best experts on this subject based on the ideXlab platform.
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alternating Augite plagioclase wedges in basement dolerites of lockne impact structure sweden a new shock wave induced deformation feature
Meteoritics & Planetary Science, 2017Co-Authors: Boris Reznik, Amar Agarwal, Luis M Alvavaldivia, Deepak SrivastavaAbstract:This paper reports peculiar alternating Augite-plagioclase wedges in basement dolerites of Lockne impact structure, Sweden. The combined microscopic and spectroscopic studies of the micro/nanoscale wedges reveal that these are deformation-induced features. First, samples showing wedges, 12 out of 18 studied, are distributed in the impact structure within a radius of up to 10 km from the crater center. Second, the margins between the Augite and labradorite wedges are sharp and the {110} prismatic cleavage of Augite develops into fractures and thereafter into wedges. The fractures are filled with molten labradorite pushed from the neighboring bulk labradorite grain. Third, compared to the bulk labradorite, the dislocation density and the residual strain in the labradorite wedges are significantly higher. A possible mechanism of genesis of the wedges is proposed. The mechanism explains that passing of the shock waves in the basement dolerite induced (i) formation of microfractures in Augite and labradorite; (ii) development of the Augite prismatic cleavages into the wedges, which overprint the microfracture in the labradorite wedges; and (iii) thereafter, infilling of microfractures in the Augite wedges by labradorite.
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Alternating Augite‐plagioclase wedges in basement dolerites of Lockne impact structure, Sweden: A new shock wave‐induced deformation feature
Meteoritics & Planetary Science, 2016Co-Authors: Amar Agarwal, Boris Reznik, Luis M. Alva-valdivia, Deepak SrivastavaAbstract:This paper reports peculiar alternating Augite-plagioclase wedges in basement dolerites of Lockne impact structure, Sweden. The combined microscopic and spectroscopic studies of the micro/nanoscale wedges reveal that these are deformation-induced features. First, samples showing wedges, 12 out of 18 studied, are distributed in the impact structure within a radius of up to 10 km from the crater center. Second, the margins between the Augite and labradorite wedges are sharp and the {110} prismatic cleavage of Augite develops into fractures and thereafter into wedges. The fractures are filled with molten labradorite pushed from the neighboring bulk labradorite grain. Third, compared to the bulk labradorite, the dislocation density and the residual strain in the labradorite wedges are significantly higher. A possible mechanism of genesis of the wedges is proposed. The mechanism explains that passing of the shock waves in the basement dolerite induced (i) formation of microfractures in Augite and labradorite; (ii) development of the Augite prismatic cleavages into the wedges, which overprint the microfracture in the labradorite wedges; and (iii) thereafter, infilling of microfractures in the Augite wedges by labradorite.
Leibo Deng - One of the best experts on this subject based on the ideXlab platform.
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Effect of SiO2/MgO ratio on the crystallization behavior, structure, and properties of wollastonite-Augite glass-ceramics derived from stainless steel slag
Materials Chemistry and Physics, 2020Co-Authors: Leibo Deng, Xiaolin Jia, Yu Shi, Fei Yun, Ruidong Jia, Xuefeng ZhangAbstract:Abstract Wollastonite-Augite glass-ceramics of the CaO–SiO2–Al2O3–MgO system were prepared from stainless steel slag as the main raw material. The effects of SiO2/MgO mass ratio on the crystallization behavior, crystalline phases, structure, and properties of the as-prepared stainless steel slag glass-ceramics were investigated by differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and physicochemical property measurements. The results showed that with decreasing SiO2/MgO ratio, the crystallization activation energies of the samples decreased from 436.48 kJ/mol to 383.84 kJ/mol, and their crystallization indexes increased from 1.67 to 3.21; in addition, the Augite crystals were gradually refined and their content increased. On the other hand, the amount of elongated wollastonite crystals decreased and the crystals gradually dispersed in the Augite crystals. Furthermore, among all the prepared glass-ceramics, the one with a density of 3.08 g/cm3 exhibited the best mechanical properties with a bending strength of 176.21 MPa and microhardness of 8.81 GPa.
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effect of sio2 mgo ratio on the crystallization behavior structure and properties of wollastonite Augite glass ceramics derived from stainless steel slag
Materials Chemistry and Physics, 2020Co-Authors: Leibo Deng, Xiaolin Jia, Yu Shi, Fei Yun, Ruidong Jia, Xuefeng ZhangAbstract:Abstract Wollastonite-Augite glass-ceramics of the CaO–SiO2–Al2O3–MgO system were prepared from stainless steel slag as the main raw material. The effects of SiO2/MgO mass ratio on the crystallization behavior, crystalline phases, structure, and properties of the as-prepared stainless steel slag glass-ceramics were investigated by differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and physicochemical property measurements. The results showed that with decreasing SiO2/MgO ratio, the crystallization activation energies of the samples decreased from 436.48 kJ/mol to 383.84 kJ/mol, and their crystallization indexes increased from 1.67 to 3.21; in addition, the Augite crystals were gradually refined and their content increased. On the other hand, the amount of elongated wollastonite crystals decreased and the crystals gradually dispersed in the Augite crystals. Furthermore, among all the prepared glass-ceramics, the one with a density of 3.08 g/cm3 exhibited the best mechanical properties with a bending strength of 176.21 MPa and microhardness of 8.81 GPa.
Yu Shi - One of the best experts on this subject based on the ideXlab platform.
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effect of sio2 mgo ratio on the crystallization behavior structure and properties of wollastonite Augite glass ceramics derived from stainless steel slag
Materials Chemistry and Physics, 2020Co-Authors: Leibo Deng, Xiaolin Jia, Yu Shi, Fei Yun, Ruidong Jia, Xuefeng ZhangAbstract:Abstract Wollastonite-Augite glass-ceramics of the CaO–SiO2–Al2O3–MgO system were prepared from stainless steel slag as the main raw material. The effects of SiO2/MgO mass ratio on the crystallization behavior, crystalline phases, structure, and properties of the as-prepared stainless steel slag glass-ceramics were investigated by differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and physicochemical property measurements. The results showed that with decreasing SiO2/MgO ratio, the crystallization activation energies of the samples decreased from 436.48 kJ/mol to 383.84 kJ/mol, and their crystallization indexes increased from 1.67 to 3.21; in addition, the Augite crystals were gradually refined and their content increased. On the other hand, the amount of elongated wollastonite crystals decreased and the crystals gradually dispersed in the Augite crystals. Furthermore, among all the prepared glass-ceramics, the one with a density of 3.08 g/cm3 exhibited the best mechanical properties with a bending strength of 176.21 MPa and microhardness of 8.81 GPa.
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Effect of SiO2/MgO ratio on the crystallization behavior, structure, and properties of wollastonite-Augite glass-ceramics derived from stainless steel slag
Materials Chemistry and Physics, 2020Co-Authors: Leibo Deng, Xiaolin Jia, Yu Shi, Fei Yun, Ruidong Jia, Xuefeng ZhangAbstract:Abstract Wollastonite-Augite glass-ceramics of the CaO–SiO2–Al2O3–MgO system were prepared from stainless steel slag as the main raw material. The effects of SiO2/MgO mass ratio on the crystallization behavior, crystalline phases, structure, and properties of the as-prepared stainless steel slag glass-ceramics were investigated by differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and physicochemical property measurements. The results showed that with decreasing SiO2/MgO ratio, the crystallization activation energies of the samples decreased from 436.48 kJ/mol to 383.84 kJ/mol, and their crystallization indexes increased from 1.67 to 3.21; in addition, the Augite crystals were gradually refined and their content increased. On the other hand, the amount of elongated wollastonite crystals decreased and the crystals gradually dispersed in the Augite crystals. Furthermore, among all the prepared glass-ceramics, the one with a density of 3.08 g/cm3 exhibited the best mechanical properties with a bending strength of 176.21 MPa and microhardness of 8.81 GPa.
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Lanthanum modification of crystalline phases and residual glass in Augite glass ceramics produced with industrial solid wastes
Journal of Non-Crystalline Solids, 2019Co-Authors: Hua Chen, Xuefeng Zhang, Ming Zhao, Yu Shi, John S. MccloyAbstract:Abstract The effects of La2O3 on microstructure and properties of the CaO-MgO-SiO2-Al2O3 glass ceramics, made from Bayan Obo West Mine tailing and fly ash, were investigated. Results showed that La2O3 additions up to 2 wt% promoted Augite crystallization. Above this concentration, La2O3 suppressed Augite crystallization by rather forming lanthanum oxyapatite that acted as a barrier for the growth of Augite. Also Cr ions, the key element for the Augite nuclei, were enriched in lanthanum oxyapatite. The La3+ cations were found to partially substitute for Ca2+ at the M2 structural sites in clinopyroxene (Augite). Nano crystalline clusters, containing La3+, Na+, Ca2+, Mg2+ and Fe3+ in Augite-like proportions, were found uniformly dispersed in the residual glassy phase. The glass ceramic with 2 wt% La2O3 shows optimum mechanical properties and chemical durability. The bending strength and Vickers hardness are 238 MPa and 7.57 GPa, acid and alkali-resistance are 97.5% and 98.9%, respectively.