(*中南工業(yè)大學(xué)粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室， 長(zhǎng)沙 410083;
**長(zhǎng)沙鐵道學(xué)院， 長(zhǎng)沙 410075)
摘 要: 對(duì)新開(kāi)發(fā)的幾種硬質(zhì)合金擠壓成形劑的流變性能與脫脂行為進(jìn)行了深入的研究， 發(fā)現(xiàn)成形劑的設(shè)計(jì)及混煉決定其流變性能與脫脂行為， 合理地選擇成形劑的組成及配比是擠壓成形新工藝技術(shù)的關(guān)鍵。實(shí)驗(yàn)條件下測(cè)得成形劑組織均勻，粘流活化能在80～115 kJ/mol之間， 粘度對(duì)溫度的依賴(lài)性較小； 在熱脫脂時(shí)，成形劑脫除速率較均勻， 便于工藝制定與控制。
關(guān)鍵字: 擠壓成形 成形劑 流變學(xué) 熱脫脂
（* State Key Laboratory for Powder Metallurgy,
** Central South University of Technology, Changsha 410083, P. R. China）
Abstract:Rheological and thermal degreasing characteristics about several kinds of novel formative agent system used for hardmetal powder extrusion molding have been studied deeply. The formative agent's design and its mixing decide their rheological properties and degreasing behaviours. The formative agent's components and formulations which have been selected carefully and reasonablely are the key to the new PEM(powder extrusion molding) technology. Under the experimental conditions, the formative agent's microstructures are homogeneous phase; the viscous flow activation energies are 80～115 kJ·mol-1; the formative agent's viscosity is little dependent on temperature, and the formative agent's thermal removal rates are also even during the degreasing temperature range. These properties are very useful for the technical control.
Key words: PEM formative agent rheology thermal degreasing
