WC-10Co-4Cr coating was prepared on Q235 steel substrate by high velocity oxygen fuel (HVOF) spray process. The microstructure and wear properties of the WC-10Co-4Cr coating were investigated by transmission electron microscopy(TEM), scanning electron microscopy(SEM), X-ray diffraction(XRD), microhardness tester and friction-abrasion testing machine. The results show that the coating exhibits dense structure with the porosity of 0.67% and compact bonding with the substrate. The coating is mainly composed of WC, and a small amount of W2C and amorphous phases as well, and the average microhardness of the coating is 1230HV0.3. The cumulative mass loss of WC-10Co-4Cr coating is only 2/5 of the cold work die steel Cr12MoV, which indicates the WC-10Co-4Cr coating exhibits better abrasive properties. The abrasive wear is the main wear mechanism for the coating.
YANG J X , ZHANG J Q , CHANG W Q , et al. High temperature dry sliding friction and wear performance of laser cladding WC/Ni composite coating[J]. Journal of Materials Engineering, 2016, 44 (6): 110- 116.
doi: 10.11868/j.issn.1001-4381.2016.06.017
3
MINDIVAN H . Wear behavior of plasma and HVOF sprayed WC-12Co+6% ETFE coatings on AA2024-T6 aluminum alloy[J]. Surface and Coatings Technology, 2010, 204 (12): 1870- 1874.
WANG D S , TIAN Z J , WANG S L , et al. High temperature wear behavior of WC particles reinforced Ni-based plasma-sprayed coating by laser remelting[J]. Transactions of the China Welding Institution, 2012, 33 (11): 13- 16.
5
HULKA I , ŞERBAN V , SECOŞAN I , et al. Wear properties of CrC-37WC-18M coatings deposited by HVOF and HVAF spraying processes[J]. Surface and Coatings Technology, 2012, 210, 15- 20.
doi: 10.1016/j.surfcoat.2012.07.077
6
WANG Q , CHEN Z , DING Z . Performance of abrasive wear of WC-12Co coatings sprayed by HVOF[J]. Tribology International, 2009, 42 (7): 1046- 1051.
doi: 10.1016/j.triboint.2009.02.011
7
HONG S , WU Y , ZHENG Y , et al. Effect of spray parameters on the corrosion behavior of HVOF sprayed WC-Co-Cr coatings[J]. Journal of Materials Engineering and Performance, 2014, 23 (4): 1434- 1439.
doi: 10.1007/s11665-014-0865-3
8
NAHVI S , JAFARI M . Microstructural and mechanical properties of advanced HVOF-sprayed WC-based cermet coatings[J]. Surface and Coatings Technology, 2016, 286, 95- 102.
doi: 10.1016/j.surfcoat.2015.12.016
9
RODRIGUEZ M , GIL L , CAMERO S , et al. Effects of the dispersion time on the microstructure and wear resistance of WC/Co-CNTs HVOF sprayed coatings[J]. Surface and Coatings Technology, 2014, 258, 38- 48.
doi: 10.1016/j.surfcoat.2014.10.014
ZHA B L , GAO S L , QIAO S L , et al. Influence of HVO-AF parameters and particle size on elastic modulus of WC-12Co coatings[J]. Journal of Materials Engineering, 2015, 43 (4): 92- 97.
doi: 10.11868/j.issn.1001-4381.2015.04.016
11
王培铭, 许乾慰. 材料研究方法[M]. 北京: 科学出版社, 2005: 145- 146.
11
WANG P M , XU Q W . Materials research methods[M]. Beijing: Science Press, 2005: 145- 146.
12
HONG S , WU Y P , GAO W W , et al. Microstructural characterisation and microhardness distribution of HVOF sprayed WC-10Co-4Cr coating[J]. Surface Engineering, 2014, 30 (1): 53- 58.
doi: 10.1179/1743294413Y.0000000184
13
INOUE A , ZHANG T , MASUMOTO T . Al-La-Ni amorphous alloys with a wide supercooled liquid region[J]. Materials Transactions, JIM, 1989, 30 (12): 965- 972.
doi: 10.2320/matertrans1989.30.965
14
ZHENG Z , LU W , HE D Y , et al. Microstructure and frictional behavior of Fe-based amorphous metallic coatings prepared by atmospheric plasma spraying[J]. RARE Metal Materialsand Engineering, 2011, 40, 160- 165.
15
LEE C , HAN J , YOON J , et al. A study on powder mixing for high fracture toughness and wear resistance of WC-Co-Cr coatings sprayed by HVOF[J]. Surface and Coatings Technology, 2010, 204 (14): 2223- 2229.
doi: 10.1016/j.surfcoat.2009.12.014
16
LIMA C , LIBARDI R , CAMARGO F , et al. Assessment of abrasive wear of nanostructured WC-Co and Fe-based coatings applied by HP-HVOF, flame, and wire arc spray[J]. Journal of Thermal Spray Technology, 2014, 23 (7): 1097- 1104.
doi: 10.1007/s11666-014-0101-6
17
WANG H , WANG X , SONG X , et al. Sliding wear behavior of nanostructured WC-Co-Cr coatings[J]. Applied Surface Science, 2015, 355, 453- 460.
doi: 10.1016/j.apsusc.2015.07.144