钛丝丝网原位合成Al_3Ti颗粒增强铝基复合涂层  

In-situ synthesized Al_3Ti particles reinforced Al-based composite coating using Ti wire net

作　　者：牛立斌[1] 王晓刚[1] 樊子民[1] 

机构地区：[1]西安科技大学材料科学与工程学院,陕西西安710055

出　　处：《材料热处理学报》2013年第12期150-154,160,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50174046);陕西省科技统筹计划项目(No.KTCQ1-17);西安市技术转移工程项目(CX1261)

摘　　要：选用直径200μm,纯度99.5%的钛丝丝网为反应源,通过熔渗+原位反应法制备出一种Al3Ti金属间化合物颗粒增强铝基表面复合涂层。通过差热分析仪(DTA)、X衍射分析仪(XRD)、电子扫描显微镜(SEM)、显微硬度计、摩擦磨损试验机对Ti丝与基体间的合成温度以及所得到的复合涂层进行分析,结果表明:根据差热分析的峰的变化情况,确定反应温度为890℃,当保温时间延长到20 min时,钛丝在铝基体中的反应较完全,原位合成为块状和条状的Al3Ti颗粒;颗粒的显微硬度(562 HV0.1)大约为基体显微硬度(123 HV0.1)的4.5倍;相对于没有增强体的Al基体而言,在载荷为10 N的干滑动磨损条件下,保温20 min所制备的复合涂层表现出较好的耐磨性,其磨损机制表现为粘着磨损和磨粒磨损共存。Using titanium wires （99.5% , 200 μm in diameter） as reactive source, an Al-based composite coating reinforced by titanium tri-aluminide （Al3Ti） particles was fabricated on A1 substrate by infiltration plus in-situ reaction methods. The obtained composite coatings were characterized by means of differential thermal analysis （DTA） , X-ray diffraction （XRD） , scanning electron microscopy （SEM） , and microhardness and friction-abrasion tests. The results show that according to the differential thermal analysis （DTA） curve, the reactive temperature is determined to be 890 ℃. When holding time is 20 min at 890 ℃ , the titanium wires react with aluminum completely to in situ synthesize A13Ti particles, which present blocky and strip-like morphology. The microhardncss of in situ Al3Ti particles （562 HV0. 1 ） is about 4.5 times higher than that of the Al-matrix （ 123 HV0.1 ）. Under the condition of dry sliding at 10 N load, compared to the unreinforeed A1 matrix, the composite coating fabricated at 890 ℃ for 20 min offers a unique wear resistance, its wear mechanism is the coexistent one of adhesive wear and abrasive wear.

关 键 词：金属间化合物 原位反应 复合涂层 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TB331[金属学及工艺—金属学]