采用冷喷涂和超音速火焰喷涂(HVOF)在AZ80镁合金表面制备了纳米WC-17Co涂层.利用SEM分析了原始粉末形貌、喷涂粒子沉积行为及涂层显微结构,并采用球盘式摩擦磨损实验机考察了涂层的摩擦磨损性能.结果表明:采用冷喷涂工艺可在AZ80镁合金基体上制备出高质量的WC-17Co涂层,涂层的显微硬度为(1 380±82) HV,磨损率为9.1×107mm3/Nm,其耐磨性较HVOF制备的WC-17Co涂层提高了1倍,较镁合金基材提高了3个数量级.研究表明,冷喷涂WC-17Co涂层在不对镁合金基体产生热影响的情况下,可以显著提高镁合金的表面性能,是一种新型镁合金表面强化工艺.
Nano WC-17Co coating was deposited on AZ80 magnesium alloy substrate by cold spraying and high velocity oxygen fuel spraying (HVOF) technology.SEM was used to characterize the original powder morphology,WC-17Co particle deposition behavior and coating microstructure.Friction and wear properties of the coating were investigated by a ball on disk tribometer.The results show that high quality WC-17Co coating can be deposited on AZ80 magnesium alloy by cold spraying technology.The microhardness of cold sprayed WC-17Co coating is (1 380±82) HV and its wear rate is 9.1 × 10-7 mm3/Nm.The wear resistance of cold sprayed WC-17Co coating is doubled than that of the HVOF sprayed coating.Moreover,wear resistance of cold sprayed coating is improved by three orders of that of the magnitude than magnesium alloy substrate.It is demonstrated that cold sprayed WC-17Co coating is an ideal surface strengthening technology for magnesium alloy,which can significantly improve the surface performance of magnesium alloy substrate without any evident heat effect for magnesium alloy substrate.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%