SiC_p/A356复合材料微弧氧化陶瓷膜的生长规律与性能  

Growth Law and Properties of Ceramic Coatings on SiC_p/A356 Composite Fabricated by Micro-arc Oxidation

作　　者：夏伶勤[1] 韩建民[1] 崔世海[2] 杨智勇[1] 李卫京[1] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044 [2]天津科技大学机械工程学院,天津300222

出　　处：《材料工程》2016年第1期40-46,共7页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51371022)

摘　　要：采用微弧氧化法在SiC_p/A356复合材料表面沉积获得连续致密的陶瓷膜,测定了陶瓷膜的生长曲线和显微硬度,利用SEM与XRD分析了陶瓷膜的组织形貌和相组成,考察了金属基复合材料微弧氧化膜的耐磨和防腐性能。结果表明:SiC增强体阻碍了微弧氧化膜的生长,但它并未破坏其完整性;微弧氧化处理初始阶段,陶瓷膜生长方式以向外生长为主,陶瓷膜主要由γ-Al_2O_3相组成;30min后,向外生长逐渐变慢,向内生长开始增强;处理20min之后,陶瓷膜主要由γ-Al_2O_3,α-Al_2O_3相和莫来石相构成;膜层耐磨性良好,耐腐蚀性能得到明显改善。Compact ceramic coatings were fabricated on the SiCp/A356 composite surface by micro-arc oxidation（MAO）.The growing curve and microhardness of coatings were determined.The morphology and phase composition of ceramic coatings were analyzed by scanning electron microscopy and X-ray diffraction respectively.The tribological properties and corrosion resistance of the coatings were investigated.The results show that the SiCphinders the coating growth,but the integrity of coating is not disrupted.At initial stage of MAO,outward-growth dominates the growth behavior of the coatings in the total thickness.Starting from 30 min,the total thickness of the coatings increases gently and the total growth rate declines sharply;at this stage,the outward growth gradually slows down,and the inward growth maintains persistent enhancement.The oxide coating is mainly composed ofγ-Al2O3 at the initial reaction stage and composed ofγ-Al2O3,α-Al2O3 and mullite after 20 min.The ceramic coating shows good wear and excellent corrosion resistance.

关 键 词：铝基复合材料 微弧氧化 陶瓷涂层 生长规律 磨损率 

分 类 号：TB333[一般工业技术—材料科学与工程] TG174.4[金属学及工艺—金属表面处理]