| Variations of Microstructure and Mechanical Properties of Si—B—O—N Ceramics with Sintering Temperatures |
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| 引用本文： | JunbaoZHANG GuangwuWEN 等.Variations of Microstructure and Mechanical Properties of Si—B—O—N Ceramics with Sintering Temperatures[J].材料科学技术学报,2002,18(4):343-346. |
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| 作者姓名： | JunbaoZHANG GuangwuWEN |
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| 作者单位： | SchoolofMaterialsScienceandEngineering,HarbinInstituteofTechnology,Harbin150001,China |
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| 基金项目： | This research is supported by the National Natural Science Foundation of China, under grant No. 50072002. |
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| 摘 要： | Si-B-O-N powder without B-O bonds synthesized by polymeric precursor were hot-pressed into ceramics at different tempera-tures.The variations of microstructure and mechanical properties of Si-B-O-N ceramics have been investigated.Crystallization of Si-B-O-N ceramics occurred at about 1400℃.Density, elastic modulus,and flexural strength of the ceramics increased with the increasing sintering temperatures, and reached to their maximum values at 1600℃ .By contrast, hardness and frac-ture toughness of the ceramics monotonically changed with increasing sintering temperatures.Hardness decreased,while the fracture toughness increased.The principal toughening mechanisms including crack deflection, crack bridging and plate grain pulling-out effects are discussed.
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| 关 键 词： | 硼化硅 氮化硅 氮化硼 陶瓷 显微组织 机械性能 |
| 收稿时间： | 2001-05-11 |
Variations of Microstructure and Mechanical Properties of Si-B-O-N Ceramics with Sintering Temperatures |
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| Junbao ZHANG,Guangwu WEN,Tingquan LEI,Dechang JIA,Jiancun RAO.Variations of Microstructure and Mechanical Properties of Si-B-O-N Ceramics with Sintering Temperatures[J].Journal of Materials Science & Technology,2002,18(4):343-346. |
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| Authors: | Junbao ZHANG Guangwu WEN Tingquan LEI Dechang JIA Jiancun RAO |
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| Affiliation: | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Si-B-O-N powder without B-O bonds synthesized by polymeric precursor were hot-pressed into ceramics at different temperatures. The variations of microstructure and mechanical properties of Si-B-O-N ceramics have been investigated. Crystallization of Si-B-O-N ceramics occurred at about 1400°C. Density, elastic modulus, and flexural strength of the ceramics increased with the increasing sintering temperatures, and reached to their maximum values at 1600°C. By contrast, hardness and fracture toughness of the ceramics monotonically changed with increasing sintering temperatures. Hardness decreased, while the fracture toughness increased. The principal toughening mechanisms including crack deflection, crack bridging and plate grain pulling-out effects are discussed |
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| Keywords: | Si-B-O-N ceramics Microstructure Mechanical properties toughening mechanisms |
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