(北京航空航天大學(xué) 材料科學(xué)工程學(xué)院 大型整體金屬構(gòu)件激光直接制造教育部工程研究中心，北京 100191)
摘 要: 為了提高TA15鈦合金的耐磨性，在TA15鈦合金表面利用激光熔覆預(yù)置的大粒度WC顆粒與TA15混合粉末層制備WC顆粒增強(qiáng)耐磨復(fù)合涂層。采用金相顯微鏡(OM)、掃描電鏡(SEM)分析涂層的顯微組織，采用X射線衍射(XRD)結(jié)合能譜(EDS)對涂層進(jìn)行物相鑒定，測試涂層在二體磨料磨損及室溫干滑動磨損條件下的耐磨損性能并分析磨損機(jī)理。結(jié)果表明：增強(qiáng)相WC顆粒在涂層中較均勻分布，初生(TiW)C/TiC相和(TiW)C+(Ti, W)共晶組織組成增強(qiáng)相的基體，涂層在二體磨料磨損及干滑動磨損條件下表現(xiàn)出優(yōu)異的耐磨性能，較鈦合金基材耐磨性能提高幾十至上百倍；WC顆粒與基體中韌性的高硬相及優(yōu)異的抗粘著性能對涂層耐磨性起主導(dǎo)作用。
關(guān)鍵字: 激光熔覆；顆粒增強(qiáng)；鈦合金；碳化鎢；耐磨性
（Engineering Research Center of Ministry of Education on Laser Direct Manufacturing for Large Metallic Components,
School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China）
Abstract:The wear resistant composite coatings reinforced by WC particles were fabricated by laser cladding using blends of WC particles with large size and TA15 powders as the raw materials. Microstructure and worn surface morphologies of the coatings were analyzed and characterized by optical microscopy (OM), scan electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). Wear resistance of the coatings was evaluated under two-body abrasive and dry sliding wear test condition at room temperature. The results show that WC particles have a uniform distribution in the coatings, which consists of the primary phase (TiW)C/TiC and (TiW)C+(Ti,W) eutectic phase as the matrix. Under two-body abrasive and block-on-ring dry sliding wear conditions, compared with titanium alloy substrate, the wear-resistance of coatings has improved dozens to one hundred times. High hardness of WC particles and the tough matrix with excellent anti-adhesion properties play a key role in improving wear resistance of the coatings.
Key words: laser cladding; particles reinforcement; titanium; WC; wear resistance
