YG8电极在氩气和硅油中对Ti17的电火花表面改性研究  

Study on Ti17 Alloy Surface Modification by Electric Spark Systems with 92WC-8Co in Argon and Silicon-oil

作　　者：李平[1] 乔生儒[1] 张丽丽[1] 王少鹏[1] 韩栋[1] 张程煜[1] 

机构地区：[1]西北工业大学,西安710072

出　　处：《材料工程》2008年第5期57-61,共5页Journal of Materials Engineering

基　　金：中国博士后科学基金资助项目(2005038610)

摘　　要：以YG8硬质合金电极,分别在硅油和氩气中对Ti17合金进行了电火花表面强化。利用扫描电镜、X射线衍射仪、辉光放电光谱仪、显微硬度计和MM200磨损试验机等对强化层的成分、组织结构、硬度和耐磨性进行了研究,并对其磨损表面的形貌进行了观察。结果表明:用YG8电极在氩气和硅油中于相同的电参数下,可分别获得显微硬度HV高达640,480、显微镜下厚度约5μm的强化层,由其硬度分布推断的改性层厚度分别可达100μm和50μm左右;前者工艺所得强化层以W2C,Ti和TiC相为主,同时还有少量的CoTi金属间化合物;后一种工艺所得强化层由Ti2O,Ti2N及Ti3SiC2相及少量TiC,TiN0.7C0.3相组成;未强化Ti17试样的磨损质量损失分别为在氩气中强化试样的两倍和硅油中强化试样的22倍。钛合金基体主要以氧化磨损和粘着磨损为主;经YG8表面改性后的钛合金试样磨损的原因可能与强化层脱落造成磨粒磨损有关。Ti17 alloy surface were strengthened by electric spark systems with 92WC-Co hard-alloy electrode in the medium of silicon oil and argon respectively under constant parameters. The microstructure, phase constituent, hardness distributing and wear-resisting property of strengthening layer in the Ti17 surface were analyzed and contrasted to Ti17 substrate by using of scanning electron microscopic, X-ray diffractometer, glow discharge optical emission spectrometer, microhardness tester and MM200 abrasion tester respectively. The surface of abrasion samples was observed and analyzed. The results showed that the strengthening layer depth under microscope was about 5μm, its microhardness was up to 640 in argon and 480 in silicon oil respectively, but it＇s strengthening layer depth derived by the distribution graphs of microhardness was about 50μm and 100μm respectively. The strengthening layer gained in the medium of argon contained W2C, Ti, TiC phase primarily and a small quantity of MoC and CoTi, but the strengthening layer formed in the medium of silicon oil consisted of phases of Ti2O, Ti2N,Ti3SiC2 and a small quantity of TiC and TiN0.7C0.3. The loss mass by abrasion of the non-strengthening samples was about 2 times of strengthening samples in argon and 22 times of strengthening samples in silicon oil respectively. The abrasion mechanism of substrates sample was oxidation abrasion and adhesion abrasion, but abrasion reason of layer strengthened by electric spark equipment with 92WC-Co electrode may concern with that desquamation of surface strengthening layer became granules for abrasion wear.

关 键 词：钛合金 Ti17 电火花 WC-CO 表面改性 

分 类 号：TG174.442[金属学及工艺—金属表面处理]