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商俊超,梁秀兵,陈永雄,徐滨士,曹维.一种新型经济高效非晶涂层的制备与性能表征[J].稀有金属材料与工程(英文),2018,47(10):2986~2992.[Shang Junchao,Liang Xiubing,Chen Yongxiong,Xu Binshi and Cao Wei.Preparation and Properties of A New Cost-effective Amorphous Composite Coating[J].Rare Metal Materials and Engineering,2018,47(10):2986~2992.]
Preparation and Properties of A New Cost-effective Amorphous Composite Coating
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Received:November 10, 2017  Revised:August 26, 2018
Key words: amorphous coating  alloy powder  flame spraying  wear
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Shang Junchao,Liang Xiubing,Chen Yongxiong,Xu Binshi and Cao Wei  
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      A NiFeBSiNb amorphous/nanocrystalline composite coating was prepared through flame thermal spraying, where a gas atomized alloy powder substituted an amorphous powder. The microstructure and thermal behavior of the laboratory-produced powders and the produced as-sprayed coating were characterized. The results demonstrated that the powder, which was spherical or ellipsoidal, was mainly consisted of the Nb2Ni21B6 and (Ni,Fe)23B6 crystalline phases, whereas the as-sprayed coating was consisted of a glassy structure and certain nanocrystalline phases. It was observed through calculations that the Rc (critical cooling rate) of the powder and the as-sprayed coating for the amorphous phases formations were 6.01×105 K/s and 4.56×103 K/s, respectively. A probable explanation for the amorphous structure, as it occurred in the as-sprayed coating, was rapid quenching from the melt at the cooling rates which exceeded the critical cooling rate Rc. The prepared coating of these as-sprayed amorphous coatings displayed the properties of a 0.17 low friction coefficient and excellent wear resistance.