(1. 三峽大學(xué) 機(jī)械與動(dòng)力學(xué)院 水電機(jī)械設(shè)備設(shè)計(jì)與維護(hù)湖北省重點(diǎn)實(shí)驗(yàn)室，宜昌 443002； 2. 常州大學(xué) 機(jī)械工程學(xué)院，常州 213164； 3. 上海交通大學(xué) 材料科學(xué)與工程學(xué)院 上海市激光制造與材料改性重點(diǎn)實(shí)驗(yàn)室，上海 200240)
摘 要: 以Fe-Ni-Cr-Ti-C粉末為原料，采用等離子束原位冶金技術(shù)在低碳鋼表面合成顆粒柱體混雜增強(qiáng)TiC-M7C3/Fe復(fù)合涂層。利用光學(xué)顯微鏡、掃描電鏡、電子能譜、X射線衍射儀、同步熱分析儀及熱力學(xué)計(jì)算，分析TiC與M7C3混雜生長(zhǎng)特征，考察干滑動(dòng)摩擦條件下粒柱混雜結(jié)構(gòu)的摩擦學(xué)特性。結(jié)果表明：原位合成時(shí)初生相TiC可作為次生相M7C3的形核基底促進(jìn)M7C3形核；TiC-M7C3粒柱混雜與單一M7C3增強(qiáng)相比耐磨性提高了31.5%；其干滑動(dòng)摩擦溫升與滑動(dòng)距離之間符合指數(shù)漸近穩(wěn)定關(guān)系y=a-b×cx；混雜增強(qiáng)時(shí)，M7C3磨損面裂紋率和脆性剝落坑增加，涂層的干滑動(dòng)磨損機(jī)理主要為磨粒磨損和氧化磨損。
關(guān)鍵字: 原位冶金；TiC-M7C3；混雜結(jié)構(gòu)；干滑動(dòng)；摩擦學(xué)
（1. Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, China; 2. School of Mechanical Engineering, Changzhou University, Changzhou 213164, China; 3. Shanghai key Laboratory of Materials Laser Processing and Modification, School of Material Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China）
Abstract:The TiC-M7C3 hybrid reinforced Fe-based coating was fabricated by in-situ reaction method on low carbon steel plate by plasma in-situ metallurgy process with Fe-Ni-Cr-Ti-C powders. Microstructure and hybrid growth character of TiC-M7C3 in the coating were analyzed by OM, SEM, XRD, EDS, simultaneous DSC-TGA, and thermodynamic analysis. Dry sliding wear behavior of TiC-M7C3/Fe coating was tested and compared with single rod carbide M7C3 reinforced Fe-based coating M7C3/Fe. The results show that the primary phase TiC can effectively act as the substrate for the nucleation of M7C3, thus can promote the formation of M7C3 in the TiC-M7C3/Fe coating. The dry sliding wear resistance, frictional temperature, surface crack rate and brittle peeling pit of M7C3 rod of coating TiC-M7C3/Fe are higher than that of M7C3/Fe. The relationship between temperature and sliding distance fits the exponential asymptotic stability model y=a-b×cx. The main dry sliding wear mechanism of coating TiC-M7C3/Fe are abrasive wear and oxidation wear.
Key words: in-situ metallurgy process; TiC-M7C3; hybrid structure; dry sliding; tribology
