PURPOSE: To improve reliability by sintering ceramic powder after burying an electroconductive fiber bundle such as metallic Ti wires, TiN wires, etc., in the ceramic powder and using the fiber bundle as a detecting fiber for a stressed state, degree of deterioration, etc., of the ceramic.

CONSTITUTION: In ceramic powder 1 added with Si3N4 powder or SiC powder having ≤3μm particle size and, when needed, a small amount of Y2O3, Al2O3, etc., a nonelectroconductive reinforcing fiber bundle 3 made of SiC fiber, Si3N4 fiber, etc., having about 10μm diameter and an electroconductive detecting fiber bundle 3 made of metallic Ti wires, TiN wires, etc., having about 100μm diameter are buried at a certain interval and provisionally formed. The provisionally formed ceramic body is sintered under a predetermined condition in N2 stream by using a hot press, etc., to obtain the ceramic having detection mechanism for destruction and deterioration with the unitedly buried reinforcing fiber bundle 2 and detection fiber bundle 3 in a matrix phase of the ceramic. The stressed state, degree of deterioration, etc., of the ceramic can easily be detected by detecting a change in electric resistance of the detection mechanism.