The invention zirconia is related to a My hwagap coated alumina, my hwagap had excellent mechanical properties By coating a zirconia and then provided with an appropriate surface roughness on the inside hwagap surface alumina does not alter the characteristic material processing can be inexpensively produced than how to want to provide that, but that is its purpose.; The present invention relates to a method by baking after molding by mixing a binder to the raw material composed mainly of alumina produced in the hwagap alumina,; Imparting a roughness to the surface of the molded article within hwagap during the molding to form a roughness having a surface roughness of 50㎛ below the surface of the calcined alumina and within hwagap;; Forming a coating layer of zirconia 30㎛ ~ 1000㎛ thickness to the plastic surface within hwagap alumina having a surface roughness of less than 50㎛ will be a method for producing my hwagap zirconia coated alumina to the invention.
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