Method for separating out spessartite crystals on surfaces of ZTA particles

The invention provides a method for separating out spessartite crystals on the surfaces of ZTA particles, which comprises the following steps: melting a crystallization agent, quickly cooling, and ball-milling to obtain glass powder; coating the surfaces of the ZTA particles with the glass powder; raising the temperature of the ZTA particles coated with the glass powder to 850-900 DEG C, and keeping the temperature, so that spessartite crystals are separated out from the surfaces of the ZTA particles; the crystallization agent comprises 60 to 65 wt% of boron glass powder, 10 to 15 wt% of ammonium dihydrogen phosphate, 10 to 15 wt% of sodium carbonate, 8 to 12 wt% of manganese dioxide and 5 to 8 wt% of calcium fluoride. 本发明提供了一种在ZTA颗粒表面析出锰铝榴石晶体的方法，包括如下步骤：将析晶剂熔融后，快速冷却后球磨，得到玻璃粉体；将玻璃粉体包覆于ZTA颗粒表面；将包覆有所述玻璃粉体的ZTA颗粒升温至850-900℃下保温，使ZTA颗粒表面析出锰铝榴石晶体；所述析晶剂包括60-65wt％的硼玻璃粉、10-15wt％磷酸二氢铵、10-15wt％碳酸钠、8-12wt％二氧化锰和5-8wt％氟化钙。