(中南工業(yè)大學(xué)粉末冶金研究所， 長沙 410083)
摘 要: 利用熱重法研究了石蠟在粉末注射成形中低溫?zé)崦摮姆堑葴貏恿W(xué)。采用微分法和積分法來確定動力學(xué)參數(shù)。并推出石蠟在聚丙烯配方體系生坯中熱脫除的動力學(xué)方程式為: -ln(1-a)=Aexp(-E/RT) t m, (0<m<1)。 當(dāng)m=0.25時, 為最可能的機理形式。熱脫蠟的動力學(xué)控制步驟為石蠟在聚丙烯中的擴散過程。
關(guān)鍵字: 粉末注射成形 熱脫蠟 非等溫動力學(xué)
（Powder Metallurgy Research Institute, Central South University of Technology, Changsha 410083）
Abstract:Low temperature thermal debinding non-isothermal kinetics of paraffin wax in PIM was studied by TG. And the kinetics parameters were determined by differential and integral methods. In the polypropylene-based greenware, the most possible dewax kinetics equation was deduced to be -ln(1-a)=Aexp(-E/RT )t 1/4. The dewax rate is controlled by the diffusion of paraffin wax in poly propylene.
Key words: PIM thermal dewax non-isothermal kinetics
