离子铝氮复合渗对渗层组织性能的影响  

Effect of Plasma Aluminum-nitriding on the Microstructure and Properties

作　　者：康前飞 魏坤霞[1,2] 安旭龙 刘细良 赵芳利 胡静 KANG Qianfei;WEI Kunxia;AN Xulong;LIU Xiliang;ZHAO Fangli;HU Jing(Jiangsu Key Laboratory of Materials Surface Science and Technology,Changzhou University,Changzhou 213164,China;Huaide College,Changzhou University,Jingjiang 214500,China;Changzhou Surface Advanced Materials Technology Co.,Ltd,Changzhou 213164,China;National Experimental Demonstration Center for Materials Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学江苏省材料表面科学与技术重点实验室,常州213164 [2]常州大学怀德学院,靖江214500 [3]常州大学材料科学与工程国家级实验教学示范中心,常州213164 [4]常州赛斐斯新材料科技有限公司,常州213164

出　　处：《中国表面工程》2023年第1期208-214,共7页China Surface Engineering

基　　金：国家自然科学基金(21978025,51774052);江苏省第三期优势学科建设项目(PAPD-3);江苏高校品牌专业建设工程(TAPP);江苏省研究生科研与实践创新计划(SJCX22_1327,KYCX22_2979)资助项目

摘　　要：为解决高温渗铝存在的基体组织粗化及离子渗氮效率低等问题,研发离子铝氮复合渗。以调质态42CrMo钢为材料,先采用电解硝酸铝法在工件表面沉积氢氧化铝膜,然后进行离子渗氮处理,在不影响基体组织性能的前提下,研发离子铝氮复合渗创新技术。采用SEM、光学显微镜、EDS、XRD、显微硬度计、电化学工作站、摩擦磨损测试机及三维轮廓仪等测试手段,对离子铝氮复合渗层进行测试分析。研究结果表明,离子铝氮复合渗处理后,试样表层高效形成多层次化合物渗层,在(520℃/4 h)工艺条件下,化合物层由17.24μm增加到51.23μm,提升约3倍;有效硬化层由175μm增加到1 050μm,提升约6倍。同时,化合物层中形成高硬度AlN及FexAl相;表面硬度由离子渗氮750 HV0.025提高到1 250 HV0.025;渗层耐蚀耐磨性比离子渗氮大幅度改善,腐蚀速率由5.42μm/a降低到1.23μm/a;摩擦因数由5.2降低到2.9,磨痕明显变窄变浅,表面未有明显磨损裂纹。首次采用沉积氢氧化铝膜作为预处理,成功研发高性能离子铝氮复合渗技术。Plasma nitriding(PN)is a widely used environment-friendly chemical heat treatment method that can improve the surface hardness and wear resistance of steel components.However,it has the disadvantages of low efficiency,and an insufficient surface hardness that fails to meet the demands certain severe applications.Aluminization is a surface modification technology that effectively improves the corrosion and oxidation resistance of various metals.Unfortunately,existing aluminizing methods are not environment-friendly and are generally performed at temperatures of up to 800℃,which has a detrimental effect on the performance of the matrix.In this study,a plasma aluminum-nitriding(PAIN)method is proposed that utilizes the advantages and overcomes the disadvantages of both plasma nitriding and aluminizing.The PAIN method was developed for 42CrMo steel by depositing aluminum hydroxide films on the surface of the samples using the electrolytic aluminum nitrate method as a pretreatment to PN.The microstructures,phase constitutions,cross-sectional elements,hardness profile,and corrosion and wear resistance of the PAIN-treated samples were tested and analyzed by scanning electron microscopy,optical microscopy,X-ray diffraction,microhardness testing,and energy-dispersive X-ray spectroscopy.An electrochemical workstation,friction and wear tester,and 3D profilometer were also used.Aside from combining the advantages of aluminizing and PN,the PAIN method also has much better effects than expected,including behavior and efficiency.This is illustrated as 1+1>2 owing to the formation of AIN with ultra-high hardness.The results showed that the PAIN layer rapidly formed on the surface of the sample.PAIN treatment at 520℃for 4 h increased the compound layer from 17.24μm to 51.23μm,increasing the efficiency by approximately three times that of PN.The effective diffusion layer increased from 175μm to 1050μm,increasing the efficiency by approximately six times that of PN.AIN and FexAl phases with high hardness formed in the nitri

关 键 词：42CRMO钢 离子铝氮复合渗 电解硝酸铝 离子渗氮 化合物层 

分 类 号：TG178[金属学及工艺—金属表面处理]