(1. 湖南工業(yè)大學(xué) 無(wú)機(jī)非金屬材料工程技術(shù)湖南省重點(diǎn)實(shí)驗(yàn)室，
株洲 412007;
2. 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: 用分段真空燒結(jié)、 背散射掃描電鏡、 透射電鏡和能譜分析等手段研究納米Ti(CN)基金屬陶瓷在燒結(jié)過(guò)程中的組織結(jié)構(gòu)演變。 結(jié)果表明： 納米Ti(CN)粉末金屬陶瓷在1 200 ℃以后開(kāi)始發(fā)生劇烈的固相反應(yīng)， 納米Ti(CN)粉末與M反應(yīng)形成富M (M=Mo, W, Ta)的(Ti, M)(CN)固溶體為核， 貧M的(Ti, M)(CN)固溶體為環(huán)的“亮芯黑環(huán)結(jié)構(gòu)”， 在1350 ℃即可獲得致密的合金。 而微米金屬陶瓷中Ti(CN)粉末顆粒很少參與固溶反應(yīng)而成為核， 富鎢和富Mo的固溶體為環(huán)， 形成“黑芯亮環(huán)結(jié)構(gòu)”， 燒結(jié)溫度在1 400 ℃以上才能獲得致密合金。
關(guān)鍵字: 納米Ti(CN); 金屬陶瓷; 顯微組織; 演變
（1. Key Laboratory of Inorganic and Nonmetal Materials Engineering Technology of Hunan Province, Hunan Industry University, Zhuzhou 412007, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: Using SEM/BSE, TEM/EDX and vacuum sintering in step temperature, the evolution of the microstructure of nano-Ti(CN) base cermets in sintering process was studied. The result indicates that nano-cermets begin solid state reaction acutely at 1 200 ℃, nano-Ti(CN) powder reacts with Mo to form (Ti, M)(CN) solid solution which is rich in M (M=Mo, W, Ta) and is the core of surrounding structure, (Ti, M)(CN) which is poor in M is the rim, it is “bright core dark rim surrounding structure”. The dense nano-cermets can be gained at 1 350 ℃. But the micron-Ti(CN) powder grains take part in solid reaction rarely and become core of surrounding structure, the solid solution which is rich in W and Mo is the rim, it is “dark core bright rim surrounding structure”. The dense micro-cermets can be gained above 1 400 ℃.
Key words: nano-Ti(CN); cermets; microstructure; evolution
