AC-HVAF制备Cr_3C_2-25CoNiCrAlY和Cr_3C_2-25NiCr涂层的高温氧化及摩擦磨损行为  

High Temperature Oxidation and Tribological Behavior of Cr_3C_2-25CoNiCrAlY and Cr_3C_2-25NiCr Coatings Prepared by AC-HVAF

作　　者：周小龙 曾德长[1] 王刚[1,2] 张友生 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640 [2]广东正德材料表面科技有限公司,广东中山528437

出　　处：《中国表面工程》2017年第5期102-109,共8页China Surface Engineering

基　　金：广东省中山市科技计划项目(2015F1FC00036)~~

摘　　要：为提高热作模具的高温氧化和高温耐磨性能,采用活性燃烧高速燃气喷涂(AC-HVAF)技术于H13钢基体上分别制备了Cr_3C_2-25CoNiCrAlY和Cr_3C_2-25Ni Cr涂层,并对比研究两种涂层的高温氧化和摩擦磨损行为,利用SEM、EDS和XRD分析其组织形貌与结构。结果表明:在800℃循环氧化100 h后,Cr_3C_2-25CoNiCrAlY涂层比Cr_3C_2-25Ni Cr涂层表面生成的氧化保护膜更致密,并生成大量高温稳定性好的尖晶石相,前者的氧化增重(0.80 mg/cm2)略小于后者(0.87 mg/cm2),说明Cr_3C_2-25CoNiCrAlY涂层的抗高温氧化能力略优;在700℃下,Cr_3C_2-25CoNiCrAlY涂层也具有更低的摩擦因数和磨损率,这归因于γ-matrix相(Co-Ni-Cr固溶体)具有很好的高温强度和热疲劳性能,对碳化物硬质相起到更强的联结支撑作用,提高了涂层的抗剥落能力。To improve the high temperature oxidation and wear resistance of hot working dies, Cr3C2-25CoNiCrAlY and Cr3C2-25NiCr coatings were prepared by activated combustion high velocity air fuel （AC-HVAF） spraying on H 13 steel, respectively. The high temperature oxidation and wear resistance performances of the coatings were contrastively studied. The microstructure and phase structure were investigated by SEM, EDS and XRD. The results show that the Cr3C2-25CoNiCrAlY coating provides superior high temperature oxidation resistance compared with the Cr3C2-25NiCr coating. The oxidation weight gain of Cr3C2-25CoNiCrAlY coating （0.80 mg/cm2） is less than that of the Cr3C2-25NiCr coating （0.87 mg/cm2） after cyclic oxidation at 800 ℃ for 100 h, which is attributed to the formation of the denser oxidation layer and spinel phase with excellent high temperature stability on surface of the Cr3C2-25CoNiCrAlY coating. The Cr3Cz-25CoNiCrAlY coating has lower friction coefficient and wear rate than that of the Cr3C2-25NiCr coating at 700 ℃ due to the y-matrix phase （Co-Ni-Cr solid solution） in the Cr3C2-25CoNiCrAlY coating having great high temperature strength and thermal fatigue properties, which is better supportive for carbide hard phase and enhances the spalling resistance of the coating.

关 键 词：活性燃烧高速燃气喷涂 Cr3C2-25CoNiCrAlY涂层 Cr3C2-25NiCr涂层 高温氧化 摩擦磨损 

分 类 号：TG174.442[金属学及工艺—金属表面处理] TG115.58[金属学及工艺—金属学]