| 摘要 |
12 In summary, the preceding description of the invention offers a method for bonding a ductile oxidation resistant metal layer to a ceramic surface to enhance the resistance of the ceramic to surface damage by thermal, mechanical, or chemical means. This is accomplished by taking advantage of the chemical reactivity of certain metals with the ceramic and by grading the thermal expansion coefficients of these various metals so as to form intermediate layers of a multi-layer composite. The intermediate metallic layers are metallurgically compatible with each other and an outer metal layer is chosen for its oxidation and corrosion resistance for an anticipated environment. Deposition of the various layers forming the multi-layer composite is performed by conventional coating techniques or hot pressing of metallic foils and is followed by a suitable vacuum annealing process to cause partial interdiffusion of the metallic layers and bonding with the ceramic phase.
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