Molybdenum based amorphous and nanocrystalline coatings prepared by high velocity oxy-fuel spraying  

作　　者：Fan, Zishuan  Yu, Hongying  Wang, Xudong 

机构地区：[1]Center for Corrosion and Protection,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Rare Metals》2012年第4期355-361,共7页稀有金属（英文版）

基　　金：supported by the National 863 projects by the Department of Science and Technology of China (No. 2002AA331080);the Program of Beijing Significant Science and Technology Project (No.020420050021)

摘　　要：The high velocity oxy-fuel(HVOF) based thermal spray process has developed as a potential advantageous approach for fabricating various kinds of functional coatings.In this article,the coatings of Mo-based alloy were synthesized using the HVOF process.The microstructure and the mechanical properties of the HVOF-processed coatings were investigated using SEM,TEM,XRD,and hardness and wear tests.Annealing treatment was applied to the as-sprayed coatings to develop the microstructure and its effect on the microstructure and mechanical properties of the coatings was examined.It is found that the HVOF-processed Mo-based alloy coatings are comprised of an amorphous splat matrix embedded with nano-sized crystalline particles.Annealing at temperatures over 950 ℃ results into crystallization of the amorphous matrix.The mechanical properties of the as-sprayed coatings are enhanced with annealing temperature up to 750 ℃ and from 950 to 1050 ℃,keeps constant between 750 and 950 ℃,and reduce over 1050 ℃.The change of the mechanical property with the microstructure was illustrated in the study.

关 键 词：molybdenum based alloy coating amorphous and nanocrystalline phases hardness and tribology anealling high velocity oxy-fuel spraying 

分 类 号：TG174.44[金属学及工艺—金属表面处理]