| 摘要 |
The present invention consists of a multilayer structure having at least one triad of layers where each of the three layers is a predetermined material. One of the materials is from a group including lanthanum, lanthanum oxide, or lanthanum-based alloys. A second material is disposed between the first material and a third material. The second material is from a group including carbon, silicon, boron, boron carbide or silicon carbide. The third material is from a group including boron or boron carbide. Alternatively, a fourth material is added to further strengthen and increase the water resistance of the multilayer structure. The fourth material is selected from a group including silicon, boron, boron carbide or silicon carbide. The fourth material is disposed between the third layer of multilayer period n and the first layer of multilayer period n-1.
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