【摘要】：噴涂粉末顆粒尺寸是影響碳化鎢涂層性能的關(guān)鍵因素。采用HVOF工藝制備3種不同WC顆粒尺寸的WC-CoCr涂層,利用掃描電鏡、X射線衍射儀、顯微硬度計(jì)和顆粒沖蝕磨損試驗(yàn)機(jī)等對(duì)涂層的組織結(jié)構(gòu)及性能進(jìn)行分析,系統(tǒng)研究了WC顆粒尺寸對(duì)涂層組織及性能的影響。結(jié)果表明:FN-WC涂層中碳化鎢分解嚴(yán)重,PN-WC及M-WC涂層中碳化鎢顆粒少量分解。FN-WC、PN-WC及M-WC涂層孔隙率分別為2.1%、2.0%和2.3%,硬度分別為1 254、1 241和1 229HV0.3,結(jié)合強(qiáng)度分別為68.7、73.5和72.9 MPa。15°攻角下FN-WC、PN-WC及M-WC涂層的抗沖蝕磨損阻力Re分別為9.3×104、15.5×104和10.74×104 g/cm3,90°攻角下的抗沖蝕磨損阻力Re分別為4.68×104、4.70×104和4.26×104 g/cm3。PN-WC涂層組織更均勻,WC相分解輕微,涂層硬度分布更集中,結(jié)合強(qiáng)度最高,在15°攻角下表現(xiàn)出最好的耐沖蝕性,綜合性能優(yōu)異。
[Abstract]:The particle size of sprayed powder is the key factor affecting the properties of tungsten carbide coating. Three kinds of WC-CoCr coatings with different WC particle sizes were prepared by HVOF process. The microstructure and properties of the coatings were analyzed by scanning electron microscope, X-ray diffractometer, microhardness tester and particle erosion wear tester. The effect of WC particle size on the microstructure and properties of the coating was studied systematically. The results show that the decomposition of tungsten carbide in FN-WC coating is serious, and that of tungsten carbide particles in PN-WC and M-WC coatings is a small amount. The porosity of FN-WC,PN-WC and M-WC coatings is 2.1%, 2.0% and 2.3%, respectively. The hardness is 1 254, 1 241 and 1 229HV0.3, and the bonding strength is 68.7, 73.5 and 72.9 MPa.15 擄, respectively, at the angle of attack of 72.9 MPa.15 擄, the FN-WC, is 68.7, 73.5 and 72.9 HV0.3, respectively. The erosion resistance Re of PN-WC and M-WC coatings is 9.3 脳 104, 15.5 脳 104 and 10.74 脳 104 g 鈮，

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