凝胶注模碳化硅复相陶瓷支撑体的结构及性能

发布时间：2018-03-16 16:37

  本文选题：支撑体　切入点：碳化硅　出处：《硅酸盐学报》2017年06期 　论文类型：期刊论文

【摘要】：以SiC粉体(D_(50)=10.38μm)为主要原料,添加少量堇青石、Al_2O_3、石墨,通过凝胶注模法制备堇青石、莫来石结合的SiC复相陶瓷管状支撑体。研究了堇青石、石墨造孔剂添加量、烧结温度等对支撑体物相组成及显微结构、孔隙率、孔径分布、抗弯强度等性能的影响。结果表明:当碳化硅含量为70%(质量分数),堇青石、Al_2O_3、石墨添加量均为10%时,支撑体孔隙率达到42.84%,抗弯强度为40.3 MPa。在1 400℃烧结温度下,可获得SiC为主晶相、堇青石和莫来石为次晶相的三相共存陶瓷支撑体。支撑体具有连通的孔结构,孔径分布范围从0.66到3.22μm,适合作为陶瓷膜的基体。
[Abstract]:Cordierite and mullite bonded SiC multiphase ceramic tubular support were prepared by gel injection molding method using SiC powder DX 50 + 10. 38 渭 m as main raw material and adding a small amount of cordierite Al2O3 and graphite. The amount of cordierite and graphite pore-forming agent was studied. The effects of sintering temperature on the phase composition, microstructure, porosity, pore size distribution, bending strength and so on of the supporting body are investigated. The results show that when the content of sic is 70% (mass fraction, cordierite Al2O3), graphite content is 10%. The porosity of the support is 42.84 and the flexural strength is 40.3 MPA. At the sintering temperature of 1 400 鈩，

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