Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 25    No. 11    November 2015

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Comparison between WC-10Co-4Cr andCr3C2-25NiCr coatings sprayed on H13 steel by HVOF
Wen-chao ZHANG1, Li-bin LIU1, Meng-ting ZHANG2,3, Guo-xing HUANG1, Jia-si LIANG1, Xian LI1, Li-gang ZHANG1

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Guangzhou Research Institute of Nonferrous Metals, Guangzhou 510650, China;
3. SAIC General Motos Wuling (SGMW) Company, Liuzhou 545007, China

Abstract:WC-10Co-4Cr and Cr3C2-25NiCr coatings were deposited on H13 steel by high velocity oxy fuel (HVOF) spraying. To enhance the thermal stability of the WC-10Co-4Cr coating, NiCr powders were sprayed between the surface coating and substrate. The microstructures of the surface and cross section, thermal shock and wear resistance of these two coatings were investigated in detail. The carbon diffusion in the two coatings was explained from the view of the thermodynamic. And the adhesive strength of Cr3C2-25NiCr coating (64.40 MPa) is almost the same as that of WC-10Co-4Cr coating (61.69 MPa). The friction tests show that the Cr3C2-25NiCr coating has higher friction coefficient than the WC-10Co-4Cr coating at both 500 and 600 °C. The wear resistance of the Cr3C2-25NiCr coating is better than that of the WC-10Co-4Cr coating.

 

Key words: HVOF spraying; WC-10Co-4Cr; Cr3C2-25NiCr; wear resistance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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