纳米Al203颗粒增强NiCoCrAIY合金激光熔覆涂层热腐蚀性能的研究  

High Temperature Corrosion of Laser Clad Nano-Al^O3 Particle Reinforced NiCoCrAIY Alloy Coating

作　　者：汪新衡 刘安民 蒋冬青 朱航生 

机构地区：[1]湖南丁学院先进制造技术研究所,衡阳421002 [2]湖南科技经贸职业学院,衡阳421001 [3]衡阳丰顺车桥有限公司产品部,衡阳421001

出　　处：《材料导报》2013年第24期98-101,共4页Materials Reports

基　　金：湖南省自然科学基金委员会与衡阳市人民政府自然科学联合基金（13JJ9025）;衡阳市科技计划项目（2012KJ32）

摘　　要：采用压片预置式激光熔覆工艺，添加适量Al2O3纳米陶瓷复合粉体，采用NiCoCrAlY合金粉末在GH4037合金表面激光熔覆制备了纳米Al2O3颗粒增强NiCoCrAlY合金涂层，分析了熔覆层显微组织，测定了熔覆涂层在1000℃时的热腐蚀动力学曲线，并对涂层进行了1000℃高温熔盐热腐蚀性能试验。结果表明，添加适量纳米Al2O3颗粒对NiCoCrAlY合金激光熔覆层组织具有明显的细化作用，对Cr20。膜在硫酸盐作用下的碱性溶解有一定的抑制作用，熔覆层的抗高温热腐蚀性能显著提高。但要得到最佳效果，纳米Al2O3颗粒的添加量存在一个合适值。Nano-Al2O3 particle reinforced NiCoCrA1Y alloy coating was prepared on the surface of GH4037 al- loy through tabletting preset laser process, using NiCoCrA1Y alloy powder as raw material and adding the appropriate amount of A12Oa nano-ceramic composite powder. The microstructure of the cladding was analyzed, the hot corrosion kinetics of laser clad coating at 1000 °C was determined, the high temperature corrosion in the 1000 °C molten salt was tested. The results show that appropriate amount of nano-A12Oa particles addition on the NiCoCrA1Y alloy laser clad coating can significantly refine the organization, inhibit alkaline dissolution of Cra 03 film under the action of the sul- fate, high temperature corrosion resistance of the laser clad coating is improved significantly. But to get the best re- sults, the addition of nano-A12 03 particles have an optimal value.

关 键 词：激光熔覆纳米Al203颗粒 NiCoCrAlY合金粉末 显微组织高温热腐蚀性能 

分 类 号：TG148[一般工业技术—材料科学与工程]