(1.中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083；
2.中南大學(xué) 應(yīng)用數(shù)學(xué)與應(yīng)用軟件系，長沙 410083；
3.北京科技大學(xué) 材料科學(xué)與工程學(xué)院，北京 100083)
摘 要: 從宏觀的角度出發(fā)，僅考慮脫脂預(yù)成形坯的體積、粘結(jié)劑含量對脫脂過程的影響，將預(yù)成形坯幾何形狀等其他因素的影響合理地歸結(jié)到擴散系數(shù)函數(shù)中。根據(jù)濃度擴散原理建立了描述粉末注射成形溶劑脫脂過程中預(yù)成形坯粘結(jié)劑含量隨時間變化的數(shù)學(xué)模型，避免了求解用Fick第二定律描述的偏微分方程，得出了一種預(yù)測脫脂量與脫脂時間的有效方法。根據(jù)模型求出了脫脂速度函數(shù)，給出了一種控制溶劑脫脂過程產(chǎn)生缺陷的分段升溫優(yōu)化方法。用該模型對硬質(zhì)合金注射成形溶劑脫脂過程進行了模擬和預(yù)測，預(yù)測結(jié)果與實驗結(jié)果吻合較好。
關(guān)鍵字: 注射成形； 化學(xué)溶劑脫脂； 數(shù)學(xué)模型
（1. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China;
2. Department of Applied Mathematics and Applied Software,
Central South University, Changsha 410083, China;
3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:A mathematical model of solvent extraction debinding process for powder injection molding is established. An effective method, which can be used to forecast the debinding time for a certain binder loss ratio and binder loss ratio in any debinding time, is given. Based on the equations, a step-by-step heating processing is suggested to avoid debinding defects. The model is used to the simulation of debinding process of the cemented carbide powder compacts and the theoretical prediction tallies with the experimental result quite well.
Key words: powder injection molding； solvent extraction debinding； mathematical model
