(1. 湘潭大學(xué) 機(jī)械工程學(xué)院 焊接機(jī)器人及應(yīng)用技術(shù)湖南省重點(diǎn)實(shí)驗(yàn)室，湘潭 411105；
2. 湘潭大學(xué) 復(fù)雜軌跡加工工藝及裝備教育部工程研究中心，湘潭 411105；
3. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 以鎢鐵和炭黑為反應(yīng)源，采用真空燒結(jié)法反應(yīng)制備不同n(C)/n(W)的WC-Fe耐磨材料。采用XRD、SEM、EDS、宏觀硬度與磨粒磨損等測(cè)試技術(shù)，對(duì)比研究n(C)/n(W)對(duì)WC-Fe耐磨材料組織與性能的影響。結(jié)果表明：正常WC+γ兩相組織對(duì)應(yīng)的n(C)/n(W)范圍為1.1~1.3，n(C)/n(W)低于1.1時(shí)，出現(xiàn)η相；而n(C)/n(W)高于1.3時(shí)，出現(xiàn)C相。隨著n(C)/n(W)在0.9~1.7之間增加，硬質(zhì)WC的含量與平均晶粒尺寸先顯著增加后緩慢變化，材料的密度、線收縮率與硬度逐漸下降，磨損質(zhì)量損失不斷增加。
關(guān)鍵字: 鎢鐵；真空燒結(jié)；原位合成；WC-Fe耐磨材料
（1. Key Laboratory of Welding Robot and Application Technology of Hunan Province, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China;
2. Engineering Research Center of Complex Tracks Processing Technology and Equipment, Ministry of Education, Xiangtan University, Xiangtan 411105, China;
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The in-situ synthesized WC-Fe wear resistant materials with different molar ratios of C to W were prepared by vacuum sintering using ferrotungsten and carbon black as reaction source. The effects of molar ratios of C and W on microstructure and properties were studied by XRD, SEM, EDS, macro-hardness tester and abrasive wear testing technology. The results show that when the molar ratios of C to W of the materials varies from 1.1 to 1.3, the materials have a normal two-phase structure. The molar ratios of C to W of the materials is lower than 1.1, the η phase appears, as when molar ratios of C to W is higher than 1.3, the C phase appears. The content and the average grain size of hard WC observably increase and then change slowly with molar ratios of C and W increase. The density, linear shrinkage and hardness of the material gradually decrease with molar ratios of C and W increase. And the wear mass loss constantly increases with increasing molar ratios of C to W.
Key words: ferrotungsten; vacuum sintering; in-situ synthesis; WC-Fe wear resistant material
