材料工程2018，Vol.46Issue(2)：57-65,9.DOI:10.11868/j.issn.1001-4381.2016.001453
激光原位合成Al2O3-TiO2复合陶瓷涂层组织结构与性能
Microstructure and Properties of Laser In-situ Synthesized Al2 O3-TiO2 Composite Ceramic Coating
摘要
Abstract
The study involves in-situ synthesis of CrFeAlTi composite coating using laser micro-melt-ing processing .The coating was successfully prepared by laser irradiating CrFeAlTi coating prepared by flame spraying on the China low activation martensitic (CLAM ) steel substrate ,and then Al2 O3-TiO2 composite ceramic coating was synthesized by in-situ reaction on the surface of flame sprayed coating .The coating morphology ,microstructure ,phase composition ,micro-hardness ,dry sliding wear properties and corrosion resistance in liquid PbBi alloy were analyzed by stereomicroscope ,scan-ning electron microscope (SEM ) , transmission electron microscope (TEM ) , X-ray diffraction (XRD) ,micro-sclerometer ,vertical universal friction wear testing machine and static PbBi corrosion test device ,respectively .The test results show that the surface of Al2O3-TiO2 composite ceramic coating is smooth ,and the microstructure of coating is both homogeneous and dense without defects such as crack ,dimple and porosity ,etc .,a good metallurgical bonding between the composite ceramic coating and the substrate ,and the interface is obvious .The phases of the coating surface are mainly composed of Al2O3 ,TiO2 ,(Al .948Cr .052)2O3 ,Fe2TiO5 and FeCr ,etc .The coating shows a high average micro-hardness of approximately 1864 .2HV0 .2 ,which is about three times higher than that of the CLAM steel substrate ,and presents gradient distribution with stable transition from the coating surface to the substrate .Comparing with the substrate ,the coating presents excellent wear resist-ance .The wear mass loss of the coating is just one sixth of that of the substrate .Meanwhile ,the coating exhibits the best corrosion resistance in the liquid PbBi.关键词
火焰喷涂/激光原位合成技术/Al2O3-TiO2复合陶瓷涂层/微观组织结构/性能Key words
flame spraying/laser in-situ synthesis technology/Al2 O3-TiO2 composite ceramic coating/microstructure/property分类
矿业与冶金引用本文复制引用
张曼莉,邱长军,蒋艳林,郑文权,夏琰..激光原位合成Al2O3-TiO2复合陶瓷涂层组织结构与性能[J].材料工程,2018,46(2):57-65,9.基金项目
国家自然科学基金重大研究计划(91326114) （91326114）
湖南省高校重点实验室(湘财教指[2014]85号) （湘财教指[2014]85号）
湖南省高校科技创新团队支持计划(湘教通[2012]318号) （湘教通[2012]318号）
湖南省重点学科建设项目(湘教发[2011]76号) （湘教发[2011]76号）
