MULTI-LAYER BODY

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PROBLEM TO BE SOLVED : To provide a multi-layer body that can simultaneously suppress the grain boundary mutual diffusion of oxygen and aluminum in a base body when exposed to an abrupt potential gradient of a corrosion gas such as oxygen, steam or the like, has superior heat resistance, and also has superior oxygen resistance barrier performance (oxidation resistance) more than a conventional art. SOLUTION : A multi-layer body comprises : a first layer formed by calcining a first raw material containing alumina and a rear earth compound (for example, Lu or the like); and a second layer formed by calcining a second raw material containing a compound including at least one element of alumina, Hf and Zr. The multi-layer body is also characterized in that, when arranged on the base material, the first layer is arranged at the side of the base material. COPYRIGHT : (C)2014, JPO&INPIT