高强度多孔氮化硅陶瓷的制备与研究  

Preparation and Study of Porous Si_3N_4 Ceramics with High Strength

作　　者：张勇[1] 王红洁[1] 张雯[1] 金志浩[1] 

机构地区：[1]西安交通大学,陕西西安710049

出　　处：《稀有金属材料与工程》2004年第6期655-658,共4页Rare Metal Materials and Engineering

摘　　要：以氮化硅为基体,通过加入一定量的纳米碳粉等添加剂,成功的制备出了具有高强度和较高气孔率的氮化硅多孔陶瓷。采用阿基米得法、三点弯曲法测试了材料的密度、气孔率及强度;用X射线衍射仪及扫描电镜对相组成及断口进行了研究。实验结果表明:加入的纳米碳粉同在Si3N4表面的SiO2或者同Si3N4颗粒本身反应,生成了极细的SiC颗粒,钉扎在型氮化硅的晶界,可以有效的增加材料的强度。在含碳量为5%(质量分数),1 780℃下保温60 min,可以制得强度大于100 MPa,气孔率大于40%的氮化硅多孔陶瓷。Porous Si3N4 ceramics with high strength and high porosity were obtained by the addition of small amount of carbon. The effects of carbon content, sintering temperature and reaction time on porous Si3N4 ceramics were studied. It was showed that SiC particles could pin the beta-Si3N4 grains boundaries and had an effective reinforcing effect, which formed through reaction of the added carbon with SiO2 on the Si3N4 surface or with the Si3N4 particles themselves. Sintered Si3N4 porous ceramics with 100MPa strength and > 40% porosity were obtained when the carbon content was 5wt%, and the sintering temperature was 780degreesC.

关 键 词：多孔陶瓷 氮化硅 碳化硅 

分 类 号：TQ174[化学工程—陶瓷工业]