Preparation and Properties of a New Cost-effective Amorphous Composite Coating

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

稀有金属材料与工程 Pub Date : 2018-10-01 DOI:10.1016/S1875-5372(18)30222-4

Shang Junchao , Liang Xiubing , Chen Yongxiong , Xu Binshi , Cao Wei

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Abstract

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 demonstrate that the powder, which is spherical or ellipsoidal, is mainly composed of Nb₂Ni₂₁B₆ and (Ni,Fe)₂₃B₆ crystalline phases, whereas the as-sprayed coating consists of a glassy structure and certain nanocrystalline phases. It is obtained through calculations that the R_c (critical cooling rate) of the powder and the as-sprayed coating for the amorphous phase formations is 6.01×10⁵ and 4.56×10³ K/s, respectively. The explanation for the amorphous structure, as it occurred in the as-sprayed coating, is the rapid quenching from the melt at the cooling rates which exceeds the critical cooling rate R_c. The as-sprayed amorphous coatings displays a low friction coefficient of 0.17 and excellent wear resistance.

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一种新型高性价比非晶复合涂层的制备与性能研究

采用火焰热喷涂法制备了NiFeBSiNb非晶/纳米晶复合涂层，其中气体雾化合金粉末取代了非晶粉末。对制备的粉末和喷涂涂层的显微组织和热行为进行了表征。结果表明，粉末呈球形或椭球状，主要由Nb2Ni21B6和(Ni,Fe)23B6晶相组成，而喷涂后的涂层则由玻璃状结构和部分纳米晶相组成。通过计算得到，粉末和喷涂涂层对非晶相形成的临界冷却速率Rc分别为6.01×105和4.56×103 K/s。对于非晶结构的解释，正如它发生在喷涂涂层，是快速淬火从熔体的冷却速度超过临界冷却速度Rc。该涂层具有较低的摩擦系数(0.17)和优异的耐磨性。

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