焦尚意,王萍,张春青,马群

• 1:西安工业大学材料与化工学院
• 2:承德石油高等专科学校机械系
• 3:西安工业大学兵研院

摘要(Abstract)：

采用激光熔凝改性的方法在铝硅合金表面制备了具有一定深度的熔凝层,并在此基础上制备了激光熔凝-等离子体电解氧化(PEO)复合防护层。通过光学显微镜、扫描电镜对激光熔凝改性层组织及PEO膜层组织结构进行分析,采用隔热装置及热冲击性能测试设备分别测试了防护层的热防护性及热冲击性能进行。结果表明,经过激光表面重熔,Al-12Si合金表层形成了以尺寸为3～5μm的等轴晶为主的激光熔凝区、以树枝晶为主的热影响区和以部分未完全熔化相及元素的富集现象为主的临界过渡区3个区域。制备的激光熔凝-PEO复合防护层致密均匀,放电微孔增多且分布均匀,孔隙率由6.83%降低至3.95%,有利于热量的储存隔绝,相比于单纯的PEO膜层,激光熔凝-PEO复合防护层隔热温度由25℃提高至36℃,隔热性能提升了44%,其热冲击性能也显著提升。

关键词(KeyWords)： Al-Si合金;激光熔凝;等离子体电解氧化;热防护性能

Abstract:

Keywords:

基金项目(Foundation): 陕西高校“金属腐蚀防护与表面工程技术”青年创新团队;; 陕西省重点研发计划项目(2018GY-111);; 陕西省教育厅产业化培育项目(17JF009);; 榆林科技计划项目(2018-2-30)

作者(Author): 焦尚意,王萍,张春青,马群

DOI: 10.13289/j.issn.1009-6264.2020-0170

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