等离子喷涂YSZ/NiCrAlY涂层及抗熔融Al-Si腐蚀性能研究  

Plasma-Sprayed YSZ/NiCrAlY Protective Coating and Its Resistance Property to Molten Al-Si Corrosion

作　　者：王鑫[1,2] 薛召露 倪振航 刘侠 张世宏[1,2] Wang Xin;Xue Zhaolu;Ni Zhenhang;Liu Xia;Zhang Shihong(Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Ma’anshan 243002,China;Research Center of Modern Surface and Interface Engineering,Anhui University of Technology,Ma’anshan 243002,China;Anhui Ma Steel Surface Engineering Technology Co.,Ltd,Ma’anshan 243000,China)

机构地区：[1]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,安徽马鞍山243002 [2]安徽工业大学现代表界面工程研究中心,安徽马鞍山243002 [3]安徽马钢表面技术股份有限责任公司,安徽马鞍山243000

出　　处：《稀有金属材料与工程》2021年第1期291-298,共8页Rare Metal Materials and Engineering

基　　金：安徽省自然科学基金(1908085QE219);安徽省重点研究与开发计划(201904a05020010,1804b06020370,201904b11020020);国家自然科学基金面上项目(51671002)。

摘　　要：热浸镀Al-Si合金涂层是一种高效的耐蚀技术。然而,其生产过程中与Al-Si熔液直接接触的部件存在严重的Al-Si熔蚀问题。采用大气等离子喷涂(APS)制备了YSZ/NiCrAlY涂层,研究了主气流量对YSZ(Y-Si-Zr)涂层微观组织结构、力学性能的影响规律、涂层的高温稳定性和耐Al-Si熔液腐蚀行为。结果表明,随着主气流量的提升,粒子熔滴的铺展均匀性、涂层致密度、力学性能均先升高后降低。在主气流量(Ar)为40 L/min时,涂层显示出最佳的表面平整度、最大的致密度以及最优的力学性能。在1000℃热处理100 h后YSZ涂层的界面结构稳定,孔隙率下降,致密度显著提高。此外,将试样在700℃熔融Al-Si液腐蚀50 h后,在YSZ涂层与熔融Al-Si合金的界面没有发现互反应区和元素互扩散现象,并且Al-Si熔液没有渗透进涂层内部而是被阻挡在涂层表面,表明APS制备YSZ/NiCrAlY涂层能够有效地抵抗Al-Si熔液腐蚀,可作为与高温Al-Si熔液接触部件的最有潜力的防护涂层之一。Hot dip Al-Si alloy coating is an efficient corrosion resistant technique.However,there are serious Al-Si corrosion problems in some parts of the production line,such as sunk rolls,which are in direct contact with the Al-Si alloy melt.In this research,YSZ/NiCrAlY protective coating system was prepared by air plasma spraying(APS).The influence of main gas flow rate on the microstructure,mechanical properties,high-temperature stability and Al-Si alloy corrosion resistance of YSZ(Y-Si-Zr)coating were also investigated.The results show that the spreading uniformity,coating density and mechanical properties of the droplet firstly increase and then decrease with the increase of main gas flow rate.The coating exhibits the best surface smoothness,maximum density and optimal mechanical properties when the main gas flow rate is 40 L/min.The interface structure of YSZ coating is stable.The porosity decreases,and the density significantly increases after heat treatment at 1000℃for 100 h.In addition,no diffusion or reaction zone is found at the interface between YSZ coating and Al-Si alloy melt when the coated sample is immersed in the Al-Si alloy melt for 50 h.Al-Si melt does not penetrate into the coating,but is blocked on the YSZ coating surface,indicating that APSed YSZ/NiCrAlY coating can effectively resist Al-Si melt corrosion,which can be used as one of the most potential protective coatings for parts contacting with high temperature Al-Si melt.

关 键 词：大气等离子喷涂 YSZ 力学性能 高温稳定性 Al-Si熔蚀 

分 类 号：TG174.442[金属学及工艺—金属表面处理]