Metal-mold precision casting method for zirconium and zirconium alloy

The invention provides a metal-mold precision casting method for zirconium and zirconium alloy. The metal-mold precision casting method includes processing a metal mold, painting a high-temperature resistant coating on the inner surface of a mold cavity of the metal mold, and pouring zirconium alloy liquid into the metal mold by a vacuum-arc-remelting kish smelting method. The high-temperature resistant coating comprises, by weight, 55-70% of fire-proof powder, 30-45% of binder, 0.1-1% of surface active agent and 0.1-1% of antifoaming agent. The fire-proof powder is composed of one of Y2O3 (yttrium oxide) powder and ZrO2 (zirconium oxide) powder. The metal mold is simple in technique and convenient to process, and has wide material sources and service life of 10-50 times; for small-batch zirconium and zirconium alloy, production cycle is short and production efficiency is high.