目前Nb基超高温合金的制备主要是通过多次电孤熔炼得到成分均匀的铸锭.其定向凝固或者是在水冷铜坩埚内采用Czochralski技术进行,或者是采用不需要坩埚的悬浮区熔法实现,但这两种方法都不能得到较高的温度梯度.为了获得更好的定向凝固组织,需要在超高温超高真空定向凝固设备上进行有坩埚的整体定向凝固.结合国内外共晶自生复合材料常用的制备技术,提出了适用于铌基超高温合金整体定向凝固技术的坩埚材料及其涂层技术.
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