矿化剂氧化铝的形貌对二氧化硅基陶瓷型芯性能的影响

Effects of Alumina Particles Morphology on Properties of Silica-based Ceramic Cores

制备了矿化剂为氧化铝的二氧化硅基陶瓷型芯,研究了矿化剂粉体粒径、形状等形貌特征对陶瓷型芯性能的影响。结果表明:随着氧化铝粉体粒径的增大,浆料流动性逐渐降低,加入氧化铝球形粉有利于改善浆料的充型性能;加入不规则形状氧化铝粉时,随着氧化铝粉体粒径的增大,型芯的烧结收缩率减小;加入球形氧化铝粉时,其粉体形状和粒径大小对收缩率和室温抗弯强度无明显影响,但导致较大的高温变形量。

Silica-based ceramic cores with alumina as mineralizer were prepared and the effects of particle size and shape on properties of ceramic cores were studied. The results show that the slurries with spherical alumina particles fill mold better than those with the ir- regular ones. When irregular alumina particles are added, the sintering shrinkage of ceramic cores decreases with the increase of parti- cle size. When spherical alumina particles are added, the particle shape or size has slight influence on the sintering shrinkage and flex- ural strength of ceramic cores at room temperature; while the resistance to deformation at high temperature is significantly weakened.