Abstract：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.
 栗卓新,祝弘滨,李辉,等.热喷涂金属陶瓷复合涂层研究进展[J].材料工程,2012(5):93-98.LI Z X,ZHU H B,LI H,et al.Progress of thermal spray cermet coatings[J].Journal of Materials Engineering,2012(5):93-98.
 杨胶溪,张健全,常万庆,等.激光熔覆WC/Ni基复合涂层高温滑动干摩擦磨损性能[J].材料工程,2016,44(6):110-116.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.
 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.
 王东生,田宗军,王松林,等.激光重熔等离子喷涂WC颗粒增强镍基涂层组织及高温磨损性能[J].焊接学报,2012,33(11):13-16.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.
 HULKA I,SERBAN V,SECOSAN 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.
 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.
 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.
 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.
 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.
 查柏林,高双林,乔素磊,等.超音速火焰喷涂参数及粉末粒度对WC-12Co涂层弹性模量的影响[J].材料工程,2015,43(4):92-97.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.
 王培铭,许乾慰.材料研究方法[M].北京:科学出版社,2005:145-146.WANG P M,XU Q W.Materials research methods[M].Beijing:Science Press,2005:145-146.
 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.
 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.
 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.
 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.
 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.
 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.
 霍斯特·契可斯.摩擦学对摩擦润滑和磨损科学技术的系统分析[M].北京:机械工业出版社,1984:66-67.HORST C.Tribology:a systems approach to the science and technology of friction,lubrication and wear[M].Beijing:China Machine Press,1984:66-67.