氮气压力对Si<sub>3</sub>N<sub>4</sub>-SiC-TiN陶瓷自蔓延燃烧合成的影响

张学军; 郑永挺; 韩杰才

氮气压力对Si₃N₄-SiC-TiN陶瓷自蔓延燃烧合成的影响

哈尔滨工业大学复合材料与结构研究所, 哈尔滨 150001

基金项目: 国家863 计划资助项目(2002AA332050)

详细信息

通讯作者:
韩杰才, 教授, 主要从事陶瓷成型方面研究　E2mail : zxj508 @tom. com

中图分类号: TQ174
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出版历程
- 收稿日期: 2005-07-17
- 修回日期: 2005-10-17
- 刊出日期: 2006-06-14

Effect of nitrogen pressure on combustion synthesis of Si₃N₄-SiC-TiN ceramic

Cent re for Composites &|St ructures| Harbin Institute of Technology| Harbin 150001| China

摘要

摘要: 以TiSi₂为反应原料, SiC 作稀释剂, 利用自蔓延高温合成(SHS) 方法合成Si₃N₄2SiC2TiN 复相陶瓷。计算了氮气压力对毛坯反应物理论转化率的影响, 并在50 、100 和150 MPa 三种氮气压力下进行了燃烧合成。结果表明, 孔隙率为50 vol %的压坯在三种条件下反应都比较完全, 反应物转化率随氮气压力增加而提高。而孔隙率为40 vol %的压坯在较低氮气压力下燃烧反应变得不完全, 产物中残留大片Si 。当压力为150 MPa 时产物中未出现单质Si 。说明氮气压力增大有利于氮气向反应前沿的渗入, 进而提高反应物的转化率。
- 燃烧合成 /
- Si₃N₄-SiC-TiN /
- 陶瓷
Abstract: The Si₃N₄-SiC-TiN multiphase ceramic was synthesized f rom TiSi₂ and SiC powders by self-propagatinghigh-temperature synthesis in which SiC is acting as a diluent . The effect of nit rogen pressure on the conversiondegree of the reactant was calculated in theory , and combustion synthesis was carried out under nit rogen pressuresof 50 , 100 and 150 MPa , respectively. The result s show that the green part s of 50 vol % porosity are well nit rifiedunder the three pressures , while those of 40 vol % porosity can not be nit rified completely in which agglomerate Si isfound when they were synthesized under lower pressure. However , there is no Si detected in the final product s madeby 40 vol % porosity part s under 150 MPa nit rogen pressure. Accordingly , the high nit rogen pressure is of advantage to the infilt ration of nit rogen and the increase of conversion degree.
- combustion synthesis /
- Si₃N₄-SiC-TiN /
- ceramic