纤维构架空间制备氧化铝多孔陶瓷材料

Preparation of Porous Ceramic Materials by Alumina Fiber Framework

为协调解决多孔氧化铝陶瓷的孔隙率与强度之间的矛盾,本文采用氧化铝纤维构架了多孔陶瓷的空间结构,研究了烧结助剂、烧结温度对材料压缩强度和气孔率的影响。结果表明,与水玻璃,莫来石作为助烧结剂不同的是,1wt.%氧化镁利用能润湿氧化铝的高温液相,可均匀的分布于氧化铝纤维表面,促进氧化铝纤维的粘结,形成空间立体框架结构。经1500℃烧结,可以得到气孔率高达77%,压缩强度为5.4 MPa的多孔氧化铝陶瓷。

Alumina porous alumina ceramics with high porosity were prepared by gel casting method, and the effects of sintering aids and sintering temperature on the compressive strength and porosity were studied. The results showed that when 1wt.% Magnesium Oxide was used as sintering aid, Magnesium Oxide was uniformly distributed in the sample, which promoted the sintering of alumina fber. When the sintering temperature was 1500 ℃, the porous alumina ceramics could be obtained with porosity of 77%, volume density of 0.84 g/cm3 and compression strength of 5.4 MPa.