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Fe包覆Si3N4金属陶瓷相反应热力学分析
Thermodynamic analysis of phase reaction of Fe coating Si3N4 cermet
【摘要】 研究非均相沉淀热还原法制备Fe包覆α-Si3N4复合粉末常压烧结界面反应特性,并进行热力学分析。研究结果表明:在1 600℃下烧结时,α-Si3N4部分转变为β-Si3N4,Fe相消失,转而生成FeSi化合物;在1 700℃下烧结时,α-Si3N4基本转变为β-Si3N4,FeSi化合物消失,Fe相重新出现;在烧结过程中,FeSi化合物或Fe晶粒发生明显长大,呈圆球状分布在Si3N4晶粒之间,实验结果可通过热力学分析进行解释。
【Abstract】 The interfacial reaction characteristics of pressure sintering of Fe coating α-Si3N4 prepared by heterogeneous precipitation-thermal reduction method was studied,and the thermodynamic analysis was carried out.The results show that when the sintering temperature is 1 600 ℃,parts of α-Si3N4 turns to β-Si3N4,and Fe phase disappears and turns into FeSi compounds;When the sintering temperature is 1 700 ℃,most α-Si3N4 changes into β-Si3N4,and FeSi compounds disappear and Fe phase reappears.During the sintering process,FeSi compounds and Fe grains distributed between the Si3N4 grains obviously grow up.The experimental results can be explained by the thermodynamic analysis.
【Key words】 heterogeneous precipitation-thermal reduction; Si3N4; interfacial reaction; thermodynamic analysis;
- 【文献出处】 中南大学学报(自然科学版) ,Journal of Central South University(Science and Technology) , 编辑部邮箱 ,2012年02期
- 【分类号】TG148
- 【下载频次】233