| Comparative study of β-Si3N4 powders prepared by SHS sintered by spark plasma sintering and hot pressing |
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| 作者姓名： | Ling Bai Xiaodong Mao Weiping Shen Changchun Ge |
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| 作者单位： | Ling Bai，Xiaodong Mao，Weiping Shen，and Changchun Ge ? Laboratory of Special Ceramics and Powder Metallurgy，University of Science and Technology Beijing，Beijing 100083，China |
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| 基金项目： | the National Natural Science Foundation of China (No.2001AA333080). |
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| 摘 要： | β-Si3N4 powders prepared by self-propagating high-temperature synthesis (SHS) with additions of Y2O3 and Al2O3 were sintered by spark plasma sintering (SPS). The densification, microstructure, and mechanical properties of Si3N4 ceramics prepared using this method were compared with those obtained by hot pressing process. Well densified Si3N4 ceramics with finer and homo- geneous microstructure and better mechanical properties were obtained in the case of the SPS technique at 200°C lower than that of hot pressing. The microhardness is 15.72 GPa, the bending strength is 716.46 MPa, and the fracture toughness is 7.03 MPa?m1/2.
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| 关 键 词： | 火花等离子体烧结 硅氮化合物 粉末冶金 自动扩展高温合成 机械性能 |
| 收稿时间： | 18 September 2006 |
| 修稿时间： | 2006-09-18 |
Comparative study of β-Si3N4 powders prepared by SHS sintered by spark plasma sintering and hot pressing |
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| Ling Bai Xiaodong Mao Weiping Shen Changchun Ge.Comparative study of β-Si3N4 powders prepared by SHS sintered by spark plasma sintering and hot pressing[J].Journal of University of Science and Technology Beijing,2007,14(3):271-275. |
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| Authors: | Ling Bai Xiaodong Mao Weiping Shen Changchun Ge |
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| Affiliation: | aLaboratory of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | β-Si3N4 powders prepared by self-propagating high-temperature synthesis (SHS) with additions of Y2O3 and Al2O3 were sintered by spark plasma sintering (SPS). The densification, microstructure, and mechanical properties of Si3N4 ceramics prepared using this method were compared with those obtained by hot pressing process. Well densified Si3N4 ceramics with finer and homogeneous microstructure and better mechanical properties were obtained in the case of the SPS technique at 200°C lower than that of hot pressing. The microhardness is 15.72 GPa, the bending strength is 716.46 MPa, and the fracture toughness is 7.03 MPa·m½. |
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| Keywords: | self-propagating high-temperature synthesis (SHS) hot pressing spark plasma sintering (SPS) silicon nitride mechanical properties |
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