Novel Chemical Method to Fabricate SiC/Al_2O_3 Ceramic Composite Coatings on Metallic Substrates

IF 0.8 4区材料科学 Q4 MATERIALS SCIENCE, COATINGS & FILMS 中国表面工程 Pub Date : 2009-01-01 DOI:10.3969/J.ISSN.1007?9289.2009.06.004

P. Xiao, D. Yang, X. Zhao, I. Shapiro, E. L. Honorato, Y. Song

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Abstract

Ceramic coatings on metallic substrates have increasing application in industry due to enhanced mechanical properties and corrosion resistance of the ceramic coatings.In particular,the SiC/Al2O3 composite coating is desirable since it could offer both high wear resistance and chemical stability at both room and high temperature.In this work,polycarbosilane(PCS) as the SiC precursor polymer,SiC nano powder as the inert filler,Al powder as the reactive filler were mixed to produce the SiC/Al2O3 composite coating,where the SiC is produced from the PCS together with SiC nanoparticles,and Al2O3 is formed due to oxidation of the Al.The Al and SiC nanopowder are used here to reduce the volume shrinkage due to formation of SiC from PCS.With variation of the processing condition,the SiC/Al2O3 composite coatings with thickness up 50 μm were produced on the Fecralloy substrates.Such coatings show dense structure without apparent crack,which indicate a great potential of such simple and flexible method to fabricate ceramic coatings on metallic substrates.

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金属基上制备SiC/Al_2O_3陶瓷复合涂层的新化学方法

由于陶瓷涂层具有较好的机械性能和耐腐蚀性能，在工业上的应用越来越广泛。特别是，SiC/Al2O3复合涂层是理想的，因为它可以在室温和高温下提供高耐磨性和化学稳定性。本文以聚碳硅烷(PCS)为SiC前驱体聚合物，以SiC纳米粉为惰性填料，以Al粉为活性填料，混合制备SiC/Al2O3复合涂层，由PCS与SiC纳米颗粒合成SiC，并由Al氧化生成Al2O3，使用Al和SiC纳米粉来减小PCS生成SiC的体积收缩。随着工艺条件的变化，在铁合金基体上制备了厚度达50 μm的SiC/Al2O3复合镀层。该涂层结构致密，无明显裂纹，表明这种简单灵活的方法在金属基体上制备陶瓷涂层具有很大的潜力。

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