分别采用高温氧化和真空电弧离子镀法在SiC纤维表面制备出C-Al2O3和SiO2-Al2O3复合涂层, 通过真空热压法制备出SiCf/Ni复合材料. 经过850—950℃, 150 h真空热处理后, 复合涂层很好地保护了纤维的完整性, 涂层中的Al2O3层与基体Ni界面结合良好, 有效地阻挡了SiCf/Ni界面处元素互扩散. C- Al2O3涂层的C层出现了扩散现象, 但涂层基本保持完整; SiO2-Al2O3涂层中SiO2层与纤维结合界面处萌生裂纹. C-Al2O3与SiO2-Al2O3复合涂层相比具有更好的阻挡界面处元素互扩散的作用.
Interface reaction between SiC fiber and matrix is a major problem which directly influences the mechanical properties. In this article, the SiO2-Al2O3,C-Al2O3 layers have been coated on the surface of the SiC fibers as the barrier layer to inhibit the SiCf/Ni element mutual diffusion. The SiCf/Ni composites have been prepared by vacuum heat press. The coatings can effectively block the SiCf/Ni element mutual diffusion and protect fiber’s integration well after heat treatment in vacuum at 850-950℃ for150 hours. The SEM observation indicated that a compact Al2O3 layer is well coated on the surface of the fiber. In contrast, the SiO2 coating is weakness and brittleness combine with fiber, and some cracks in the interface can be seen clearly. The C layer in the C-Al2O3 coating disappeared and dissolved after heat treatment at 850-950℃ for 100 hours.
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