Structure and wear behaviour of nanostructured and ultrafine HVOF spraying WC-17Co coatings

被引：23

作者：

Chen, H. ^{[1
,2
]}

Gou, G. Q. ^{[2
]}

Tu, M. J. ^{[1
]}

Liu, Y. ^{[2
]}

机构：

[1] Sichuan Univ, Inst Mat Sci & Engn, Chengdu 610041, Peoples R China

[2] SW Jiaotong Univ, Inst Mat Sci & Engn, Chengdu 610031, Peoples R China

来源：

SURFACE ENGINEERING | 2009年 / 25卷 / 07期

关键词：

Nanostructured; HVOF; WC-17Co; Elevated temperature; Wear; MICROSTRUCTURE; SIZE; TOUGHNESS;

D O I：

10.1179/026708408X329489

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanostructured and ultrafine WC-17Co coatings have been prepared by means of the high velocity oxyfuel (HVOF) technique. The structures of the two feedstock powders were analysed. The wear resistances at the elevated temperature (600 degrees C) of the two coatings were compared using GCr15 steel as a counterpart in sliding wear tests. The results show that the WC particles are of nanosize, ranging from 50 to 500 nm. Finer subparticles of 2-5 nm are also found, composed of the nanosized WC particles. These subparticles can act as crystallising nuclei and make the grains much finer during the HVOF spraying process, which is beneficial to the formation of nanostructure in the coating. The wear resistance and fracture toughness of the nanostructured coatings at elevated temperatures are better than that of ultrafine coatings.

引用

页码：502 / 506

页数：5

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