摘要
在单一氮化硅(Si3N)陶瓷中加入TiN可改善其材料的脆性,但对复合材料的氧化性能有无影响尚不十分清楚。针对这一问题,本文对TiN颗粒增韧Si3N4复合材料氧化行为进行了研究。结果表明:试样在800～1000℃温度下氧化,符合抛物线规律,且氧化增重随TiN含量的增加而增加,当TiN质量分数为50%时,氧化增重急剧增加;在此温度范围内,含TiN质量分数为30%的试样其氧化激活能为145kJ/mol,较单一氮化硅容易氧化;氧化温度越高,氧化越严重,试样氧化后的强度损失率增大。
The brittleness of Si_3N_4 ceramic is improved by adding TiN,but it is unclear the influence of its oxidation properties. Oxidation behavior of TiN particulate reinforcement of Si3N4 composites has been investigated in this paper. The results indicate: Oxidation of composite tested between 800℃~1000℃ follows the typical parabolic law. With the increasing of TiN content, oxidation weight gain of composite increases. Oxidation weight gain of composite appears transition when TiN content is 50wt%. The oxidation activation energy of 30%TiN composite is 145kJ/mol in this temperature range. The higher oxidation temperature, the more serious oxidation is, the larger reduction of strength after oxidation.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2002年第4期1-4,11,共5页
Nuclear Power Engineering
