定向凝固用陶瓷型壳高温力学性能研究现状

Survey of Elevated Mechanical Properties of Ceramic Shell Mold in Directional Solidification

简述了高温合金定向凝固用陶瓷型壳的工况,重点介绍了在浆料中添加矿化剂和粒度小于10μm超细氧化铝粉等提高型壳材料的化学反应活性以促进型壳中莫来石的形成,进而提高陶瓷型壳的高温强度和抗蠕变性能的措施。还有采用非连续纤维和连续纤维强化型壳,提高其强度和抗蠕变性能的方法。并通过提高型壳孔隙率和在面层形成阻挡层的方法提高型壳的抗热震性能。同时,指出了定向凝固用陶瓷型壳存在的一些问题,论述了其发展方向。

Application of ceramic shell mold in elevated alloy directional solidification was reviewed,focusing on adding mineralizer and ultrafine alumina powder with the size of less than 10μm to increase chemical reactive activity of ceramic shell mold materials to promote the formation of the mullite,and adopting discontinuous or continuous fiber to strengthen mold shell,to improve the elevated strength and creep resistance of the shell mold.In addition,thermal shocking resistance of ceramic shell mold can be improved by increasing porosity in the ceramic shell mold and forming barrier layer at the layer.Furthermore,some problems in the ceramic shell molds were pointed out.