Li_2O为烧结助剂的Si_3N_4陶瓷低温烧结过程研究  

Low Temperature Sintering Process of Si_3N_4 Ceramics with Li_2O as Sintering Additive

作　　者：樊磊[1] 周萌[1] 陈猛[1] 卢学峰[1] 王超[1] 王红洁[1] 

机构地区：[1]西安交通大学 金属材料强度国家重点实验室,陕西西安710049

出　　处：《稀有金属材料与工程》2013年第S1期451-454,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(90816018;51272206)

摘　　要：分别选用Li2O烧结助剂和Y2O3-Al2O3复合烧结助剂作为对比,无压烧结氮化硅陶瓷,研究了Li2O对烧结致密化过程和相变过程的影响。结果表明,以Li2O作为烧结助剂,烧结系统的共晶液相在1200℃产生,颗粒重排可以在较低的温度下进行,且致密化速度较快,氮化硅的α-β相变过程被促进,在1600oC即可得到发育良好的β-Si3N4棒状晶。The Si3N4 ceramics were prepared by pressureless sintering with both Li2O and Y2O3-Al2O3 as sintering additives. The effect of Li2O on densification and phase transition has been researched. In contrast to Y2O3-Al2O3 of sintering additives, the eutectic liquid appears at 1200 ℃ and the particles rearrangement starts at lower temperature with Li2O as sintering additives. The densification is accelerated with Li2O. The α-β phase transition of Si3N4 is accelerated with Li2O as the sintering additive. The elongated β-Si3N4 grains have been obtained at 1600℃

关 键 词：SI3N4 LI2O 烧结助剂 液相烧结 致密化 

分 类 号：TQ174.1[化学工程—陶瓷工业]