丙烷燃烧火焰热量分布均匀，自由燃烧温度比乙炔低500℃。为解决氧乙炔火焰爆炸喷涂温度过高和粒子受热不均匀引起碳化钨脱碳和氧化问题，用氧气、乙炔和丙烷为混合燃气，通过优化喷涂工艺制备了硬度高、结构均匀致密的碳化钨涂层。用X射线衍射仪(XRD)、扫描电镜附带的能谱仪(EDS)、金相显微镜和显微维氏硬度计等研究了丙烷对爆炸喷涂WC-10Co4Cr涂层的结构、组成和力学性能的影响规律。结果表明：在氧气和乙炔混合燃气中加入丙烷可有效减少碳化钨涂层的氧化和脱碳。提高丙烷流量，涂层的硬度和附着力先增后降、孔隙率则先降后增。丙烷流量为3.3 L· min-1时，涂层的综合性能最优。截面维氏显微硬度达到13.08 GPa、孔隙率为0.8%，涂层与基材结合强度达到150 MPa。%Propane has uniform heat energy distribution with flame temperature (500℃) lower than acetylene. Coatings with high hardness and dense microstructure were obtained via optimization of spray parameters and adding propane in oxyacetylene gas. The effects of propane on structure and mechanical properties of WC-10Co4Cr coatings prepared by detonation gun spray process were investigated by X-ray diffraction (XRD), energy dispersive spectrometer (EDS), metallurgical microscope and Vickers microhardness meter. The results show that propane can reduce oxidation and decarburization of tungsten carbide coating. With the increase of propane gas flow, the hardness and the bonding strength of the coatings increase first and then decrease, while the porosity shows the opposite. The coating performance reaches optimum when the propane flow rate is 3.3 L⋅min−1, and the cross section Vickers microhardness is 13.08 GPa, with porosity and bonding strength of 0.8% and 150 MPa, respectively.
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