| http://www.w3.org/ns/prov#value | - With respect to the method for forming the alumina film on the surface of the ceramic fired body, a method in which the ceramic fired body is impregnated with a solution of a metal compound containing aluminum such as Al(NO3)3 and then heated, and a method in which the ceramic fired body is impregnated with a solution containing alumina powder and then heated, and other methods may be used.
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