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| SiO_2-BN-Si_3N_4系复相陶瓷制备及性能 | |
| 引用本文： | 裴雨辰,李淑琴,于长清,黄正宇,马景陶,李嘉禄.SiO_2-BN-Si_3N_4系复相陶瓷制备及性能[J].稀有金属材料与工程,2009,38(Z2). |
| 作者姓名： | 裴雨辰 李淑琴 于长清 黄正宇 马景陶 李嘉禄 |
| 作者单位： | 1. 天津工业大学,天津,300160 2. 中国航天科工集团306所,北京,100074 3. 清华大学,北京,100084 |
| 摘 要： | 以Y_2O_3和Al_2O_3陶瓷粉体作为烧结助剂,对不同含量BN原料配比无压烧结制备SiO_2-BN-Si_3N_4系复相陶瓷,生坯采用注凝成型制备,然后在1780 ℃保温2 h烧结,烧结体主要由板条状的Si_2N_2O及长柱状的β-Si_3N_4晶粒构成,BN晶粒弥散在各晶粒之间.Si_2N_2O相通过反应SiO_2+Si_3N_4=2Si_2N_2O原位生成.Si_2N_2O具有优异的抗氧化性,Si_3N_4具有高的强度,而BN的加入大大提高了材料的可加工性能,材料结合了各相的优异性能.实验结果表明:材料热冲击性能优异,热冲击温差在800 ℃时,材料的弯曲强度还略有提高,1200 ℃时,材料的残余弯曲强度保持不变. |
| 关 键 词： | 性能 复相陶瓷 |
Fabrication and Properties of SiO_2-BN-Si_3N_4 Composites |
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| Pei Yuchen,Li Shuqin,Yu Changqing,Huang Zhengyu,Ma Jingtao,Li Jialu.Fabrication and Properties of SiO_2-BN-Si_3N_4 Composites[J].Rare Metal Materials and Engineering,2009,38(Z2). | |
| Authors: | Pei Yuchen Li Shuqin Yu Changqing Huang Zhengyu Ma Jingtao Li Jialu |
| Affiliation: | Pei Yuchen1,Li Shuqin2,Yu Changqing2,Huang Zhengyu2,Ma Jingtao3,Li Jialu1 (1. Tianjin Polytechnic University,Tianjin 300160,China) (2. Institute 306th,China Aerospace Science , Industry Corporation,Beijing 100074,China) (3. Tsinghua University,Beijing 100084,China) |
| Abstract: | SiO_2-BN-Si_3N_4 composites were prepared by in-situ liquid pressureless sintering process using Y_2O_3 and Al_2O_3 powders as sintering additives. The green body was fabricated by gel-casting process, and then sintered at 1780 ℃ for 2 h. The sintered body was mainly composed of the plate-like Si_2N_2O and rod-like α-Si_3N-4 grains. BN was dispersed in the grains. The Si_2N_2O phase was obtained by in-situ reaction of SiO_2+Si_3N_4→2Si_2N_2O. Si_2N_2O possesses the excellent oxidation resistance,Si_3N_4 has high strength,and the addition of BN can improve the machining property. The excellent properties of all phases are combined into the materials. The results show that the materials have good thermal shock resistance. When the temperature of the thermal shock is 800 ℃, the residual strength is improved slightly and when the temperature was 1200 ℃,the residual strength is unchangeable. |
| Keywords: | SiO_2-BN-Si_3N_4 SiO_2-BN-Si_3N_4 property multi-phases ceramics |
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