Preparation method of ceramic core coating

The invention provides a preparation method of a ceramic core coating. According to the preparation method, an yttrium oxide columnar coating is prepared on the surface of a silicon-based ceramic core by adopting an electron beam physical vapor deposition (EB-PVD) method. The yttrium oxide columnar coating can be used as a supporting structure, so that the high-temperature strength and the high-temperature deformation resistance of the ceramic core matrix are remarkably improved; high stability is achieved at the high temperature, and interface reaction with a casting is avoided; the specific surface area of the coating is increased, so that alkali liquor can be accelerated to enter a matrix material, and the core matrix can be smoothly removed; the coating prepared through the EB-PVD method is high in uniformity, the thickness of the coating is about 50 microns, and the casting wall thickness product cannot be affected. 本发明提供了一种陶瓷型芯涂层制备方法，其采用电子束物理气相沉积方法(EB-PVD)在硅基陶瓷型芯表面制备氧化钇柱状涂层。氧化钇柱状涂层可作为支撑结构，显著提升陶瓷型芯基体的高温强