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中文摘要：
钡锶铝矽酸盐(BSAS ) 和 Si/BSAS 涂层经由一个二拍子的圆舞激光 cladding 过程在 C/SiC composites 的表面上被制作。微观结构，机械性质，和样品的水蒸汽腐蚀行为被调查。BSAS 涂层被发现紧被结合到底层和仅仅一些毛孔， microcracks 被观察。硅中间层的介绍被揭示减少热应力并且支持在激光 cladding 过程期间形成的缺点愈合。为了评估腐蚀抵抗， BSAS 和 Si/BSAS-coated， C/SiC composites 暴露于 50% H 2 在 1250 敢椠 ? 慦桳潩的 O 和 50% O 2 吗？
英文摘要：
Barium-strontium aluminosilicate （BSAS） and Si/BSAS coatings were fabricated on the surface of C/SiC composites via a two-step laser cladding process. The microstructure, mechanical properties, and the water vapor corrosion behavior of the samples were investigated. The BSAS coating was found to be tightly bonded to the substrate and only a few pores and microcracks were observed. The introduction of a silicon middle layer was revealed to reduce thermal stress and promote the healing of defects formed during the laser cladding process. To evaluate the corrosion resistance, the BSAS and Si/BSAS-coated C/SiC com- posites were exposed to an atmosphere of 50% H2O and 50% O2 at 1250 ℃. The resulting weight change and flexural strength were measured as a function of the corrosion time. The addition of the silicon middle layer below the BSAS top layer resulted in a better resistance to water vapor corrosion. Furthermore, the Si/BSAS-coated samples showed a lower weight loss and a smaller reduction in flexural strength than the BSAS-coated and the uncoated samples during water vapor corrosion. Thus, laser cladding is dem- onstrated to be an effective and feasible method to fabricate high-quality ceramic coatings on C/SiC composites. The introduction of a silicon middle layer can inhibit defect formation during the laser clad- ding process and protect the composite from water vapor corrosion.
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