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Azmi ERDOGAN; Kadir Mert DOLEKER
中国有色金属学报(英文版), 2021, Volume: 31, Issue: 8Journal Article
用超音速火焰喷涂(HVOF)法在316L不锈钢基体上沉积Al0.2CrFeNiCo和Al0.2CrFeNiCu两种高熵合金涂层,然后对涂层进行激光重熔(LR)以改善其显微组织.研究LR工艺对涂层干滑动磨损和氧化行为的影响.结果表明,将粉末与单体元素混合导致HVOF涂层中形成内氧化物.LR消除了氧化物和气孔.LR后,两种合金中均以FCC相为主,而在Al0.2CrFeNiCo合金中观察到BCC、sigma和Cr2O3相.HVOF后,Al0.2CrFeNiCo和Al0.2CrFeNiCu涂层的硬度分别为HV 591和HV 361.LR后,其硬度分别减小到HV 259和HV 270.与其他样品相比,虽然HVOF涂层受载荷增加的影响最大,但其表现出最高的耐磨性,且基体的耐磨性最差.氧化实验后,HVOF涂层被完全氧化,氧化50 h后涂层因其多孔结构从基体上脱落.LR涂层具有较好的抗氧化性能.氧化实验后,Al0.2CrFeNiCo涂层主要由Cr2O3氧化层组成,Cr2O3氧化层在氧化实验后期的生长速度较慢,而Al0.2CrFeNiCu涂层则主要由尖晶石相组成.
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