(1. 硬質(zhì)合金國家重點實驗室，株洲 412007；2. 中南大學 材料科學與工程學院，長沙 410083；
3. 中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 結(jié)合相圖熱力學計算，使用DICTRA軟件計算模擬Co-W-Ti-C-N、Co-W-Ti-Nb-C-N和Co-W-Ti-Ta-C-N體系梯度硬質(zhì)合金梯度層形成過程，對比計算模擬和實測的梯度硬質(zhì)合金中Co含量的距離變化曲線。通過分析各相體積分數(shù)及組元成分隨距離的分布研究燒結(jié)時間、燒結(jié)溫度、Co含量和Ti含量對梯度層厚度的影響。結(jié)果表明：計算模擬與實驗數(shù)據(jù)吻合較好。延長燒結(jié)時間、升高燒結(jié)溫度和增加Co含量均會促進梯度層厚度的增加，而增加Ti含量則會抑制梯度層厚度的增加。
關(guān)鍵字: 梯度硬質(zhì)合金；梯度層；計算機模擬；DICTRA
TAN Cheng-yu2, CHEN Li1, 3, ZHANG Zhong-jian
（1. State Key Laboratory of Cemented Carbides, Zhuzhou 412007, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The gradient zone formation in Co-W-Ti-C-N, Co-W-Ti-Nb-C-N and Co-W-Ti-Ta-C-N cemented carbides was simulated by using the DICTRA software package in conjunction with thermodynamic calculations. Simulated elemental concentration profiles for Co were compared with the experimental results. Taking into account the volume fractions of different phases and elemental concentration profiles, the effects of sintering time, sintering temperature, as well as the contents of Co and Ti on gradient zone formation, were investigated. The results show that the simulated results agree reasonably with the experimental data. The long sintering time, high sintering temperature and large content of Co increase the thickness of the gradient zone, but the high content of Ti restrains the thickness of gradient zone increasing.
Key words: gradient sintering of cemented carbides; gradient zone; computer simulation; DICTRA
