铝基体钛辅助氮化层的微观结构与耐磨性  

Microstructures and wear resistance of titanium-assisted nitrided layers on aluminum substrate

作　　者：李欣[1] 陆万里 任振安[1] LI Xin LU Wanli REN Zhen＇an(College of Materials Science and Engineering,Jilin University,Changchun 130025,China Tenneco FAWSN （Changchun） Automobile Parts Co. , Ltd. , Changchun 130013, China)

机构地区：[1]吉林大学材料科学与工程学院,长春130025 [2]长春天纳克一汽富晟汽车零部件有限公司,长春130013

出　　处：《中国科技论文》2017年第4期444-448,共5页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20120061110088);国家自然科学基金资助项目(51101072)

摘　　要：为提高1060铝基体表面氮化层的耐磨性,采用含氮热等离子氮化同时送钛粉的方法,这种钛辅助氮化方法可以同时获得氮化铝(AlN)和氮化钛(TiN)强化相。通过改变含氮热等离子电流(I=100~160A)和氮化气氛流量比例(Ar/N2=8/2、6/4、4/6、2/8L/min),研究氮化工艺参数对钛辅助氮化的影响。钛辅助氮化条件下制备的氮化层由AlN、Al固溶体、Al3Ti和TiN相组成,黄色TiN密集分布区的平均显微硬度为1 025HV,明显高于AlN密集分布区的平均显微硬度(589HV)。在等离子气中氮气比例为60%,电流为120A的条件下,氮化层的磨损失质量为4.3mg,平均摩擦系数为0.215 5。表面氮化层的摩擦系数比铝基体下降了32%,耐磨性提高了3.6倍。钛辅助氮化可以获得AlN与TiN复合强化效果,明显提高氮化层的耐磨性。To improve the wear resistance of the nitrided layers on surface of the 1060 aluminum substrate, the nitriding method by nitrogenous thermal plasma was used with synchronously feeding titanium powders. The strengthening phases both aluminum nitride （AIN） and titanium nitride （TiN） could be simultaneously obtained by this titanium-assisted nitriding process. The influ-ence of nitriding processing parameters on titanium-assisted nitriding effect was investigated by changing the currents （1=100- 160 A） and nitriding atmosphere （Ar/N2 = 8/2、6/4、4/6、2/8 L/min） of the nitrogenous thermal plasma. Under the condition of the titanium-assisted nitriding the prepared nitrided layers consisted of AIN, aluminum solution, Al3Ti and TiN phases. The av-erage micro-hardness was measured as high as 1 025 HV for yellow intensive TiN areas, which was obviously higher than that of intensive AIN areas （589 HV）. When the nitrogen proportion in the thermal plasma atmosphere was 6 0 % and the plasma current was 120 A, the weight loss of the nitrided layer was 4. 3 mg and its average friction coefficient was 0. 215 5. Compared with alu-minum substrate, the friction coefficient was decreased by 3 2 % and the wear resistance was increased by 3. 6 times. The com-pound strengthening effect could be obtained by titanium-assisted nitriding and the wear resistance of the nitrided layers could be significantly improved on surface of aluminum substrate.

关 键 词：材料加工工程 氮化 等离子 微观结构 氮化铝 氮化钛 显微硬度 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]