The face coating of investment shell mold was made up of hexagonal boron nitride (hBN) powders with a few yttria (Y2O3) particles and colloidal yttria as binder.

• 氮化硼基复合型壳的面层主要由预处理后的六方氮化硼粉体、氧化钇粉体和粘结剂钇熔胶组成。