渗氮处理对HVOF喷涂Al_(1-x)CoCrFeNiTi_(x)(x=0,0.125,0.250)高熵合金涂层组织结构和磨损性能的影响  

Effect of Nitriding Treatment on the Microstructure and Wear Properties of HVOF Sprayed Al_(1-x)CoCrFeNiTi_(x)(x=0, 0.125, 0.250) High-Entropy Alloy Coatings

作　　者：郭禹尧 周永宽 朱丽娜[1,3] 康嘉杰 马国政[4] GUO Yuyao;ZHOU Yongkuan;ZHU Lina;KANG Jiajie;MA Guozheng(School of Engineering Technology,China University of Geosciences(Beijing),Beijing 100083,China;School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China;Zhengzhou Research Institute,China University of Geosciences(Beijing),Zhengzhou 451283,China;National Key Laboratory for Remanufacturing,Army Academy of Armored Forces,Beijing 100072,China)

机构地区：[1]中国地质大学(北京)工程技术学院,北京100083 [2]江苏科技大学材料科学与工程学院,江苏镇江212100 [3]中国地质大学(北京)郑州研究院,河南郑州451283 [4]陆军装甲兵学院装备再制造技术国防科技重点实验室,北京100072

出　　处：《材料保护》2023年第8期56-63,76,共9页Materials Protection

基　　金：国家重点研发计划(2022YFB3706600);国家自然科学基金面上项目(52175196,52275218)资助。

摘　　要：为了研究渗氮处理对HVOF喷涂Al_(1-x)CoCrFeNiTi_(x)(x=0,0.125,0.250)高熵合金涂层组织结构和磨损性能的影响,采用HVOF技术在35CrMo钢基体上制备Al_(1-x)CoCrFeNiTi_(x)(x=0,0.125,0.250)高熵合金涂层,然后对其进行渗氮处理。利用SEM、XRD、三维白光干涉仪以及EDS等表征手段研究了渗氮处理对HVOF喷涂Al_(1-x)CoCrFeNiTi_(x)(x=0,0.125,0.250)高熵合金涂层组织结构和磨损性能的影响。结果表明:渗氮处理后的Al_(1-x)CoCrFeNiTi_(x)(x=0,0.125,0.250)高熵合金涂层组织结构致密,具有典型的热喷涂层状结构,厚度约为300~350μm,氮化层厚度约为10μm,氮化层相结构为FCC相和AlN、CrN等氮化物相,氮化层的显微硬度分别为981 HV_(2 N)(x=0)、1090 HV_(2 N)(x=0.125)和1194 HV_(2 N)(x=0.250),和未经渗氮处理过的高熵合金涂层的显微硬度479 HV_(2 N)(x=0)、506 HV_(2 N)(x=0.125)、548 HV_(2 N)(x=0.250)相比有着显著的提升;并且随着Ti含量的增加,氮化层的耐磨性增加,其中Al_(0.750)CoCrFeNiTi_(0.250)氮化层具有最优异的耐磨性能(2.17×10^(-6)mm^(3)·N^(-1)·m^(-1))。Al_(1-x)CoCrFeNiTi_(x)(x=0,0.125,0.250)氮化层的磨损失效机理主要是磨粒磨损、氧化磨损和黏着磨损。For studying the effect of nitriding treatment on the microstructure and wear properties of HVOF sprayed Al_(1-)_(x)CoCrFeNiTi_(x)(x=0, 0.125, 0.250) high-entropy alloy coatings, the HVOF technology was employed to prepare Al_(1-x)CoCrFeNiTi_(x)(x=0, 0.125, 0.250) high-entropy alloy coating on 35CrMo steel substrate, which were further nitrided. The effects of nitriding treatment on the microstructure and wear properties of Al_(1-x)CoCrFeNiTi_(x)(x=0, 0.125, 0.250) high-entropy alloy coating prepared by HVOF were studied via characterization methods such as SEM, XRD, 3D white light interferometer and EDS. Results showed that the high-entropy alloy coating of Al_(1-x)CoCrFeNiTi_(x)(x=0, 0.125, 0.250) after nitriding treatment had a dense microstructure with a typical thermal spray coating-like structure. The coating thickness was about 300~350 μm, the nitriding layer thickness was about 10 μm, and the nitriding layer phase structure was FCC phase and AlN, CrN and other nitriding phases. Meanwhile, the microhardness of the nitriding layer was 981 HV_(2 N)(x=0), 1 090 HV_(2 N)(x=0.125) and 1 194 HV_(2 N)(x=0.250), respectively, which was significantly improved compared with the microhardness of 479 HV_(2 N)(x=0), 506 HV_(2 N)(x=0.125) and 548 HV_(2 N)(x=0.250) of the unnitrided high-entropy alloy coating. With the increase of Ti content, the wear resistance of the nitriding layer increased, and Al_(0.750)CoCrFeNiTi_(0.250) nitriding layer possessed the best wear resistance [(2.17×10^(-6) mm^(3)/(N·m)]. Besides, the wear failure mechanism of Al_(1-x)CoCrFeNiTi_(x)(x=0, 0.125, 0.250) nitriding layer was mainly abrasive wear, oxidation wear and adhesive wear.

关 键 词：渗氮 高熵合金涂层 HVOF 微观组织结构 磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]