( 1. 湖南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410082；
2. 北京科技大學(xué) 材料科學(xué)與工程學(xué)院， 北京 100083；
3. 中南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410083)
摘 要: 研究了熱塑-熱固性粘結(jié)劑RG1-2的固化機(jī)理及固化動力學(xué)， 結(jié)果表明： 固化過程中發(fā)生了雙氰胺中氨基與環(huán)氧基的加成反應(yīng)、 環(huán)氧基的醚化反應(yīng)、 氰基本身的反應(yīng)及其與環(huán)氧基的反應(yīng)。 外推法得到固化起始溫度ti、 峰頂溫度tp、 峰終溫度tf分別為157、 177和206℃， 固化反應(yīng)的活化能為112.5kJ/mol。 根據(jù)固化動力學(xué)參數(shù)和粘結(jié)劑其它組元的性質(zhì)， 制定了適宜的脫脂工藝制度。 研究了脫脂工藝對粘結(jié)劑脫除量、 脫脂坯強(qiáng)度、 碳含量的影響。 制備了力學(xué)性能優(yōu)良、 尺寸精度高的PIM硬質(zhì)合金制品。
關(guān)鍵字: 粉末注射成形； 粘結(jié)劑； 硬質(zhì)合金； 脫脂
for PIM process
（ 1. School of Materials Science and Engineering,
Hunan University, Changsha 410082, China;
2. School of Materials Science and Engineering,
University of Science and Technology Beijing,
Beijing 100083, China;
3. School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: The mechanism and kinetics of the curing reaction of RG1-2 was studied. It was proved that the curing reaction include amido-epoxy reaction, etherisation of amido, polymerization of amido, etc. The curing parameters such as beginning temperature, top point temperature and finishing temperature of the DSC curve were determined by graph method as 157, 177 and 206℃, respectively. The activation energy Ea was calculated as 112.5kJ/mol. Temperature schedule of thermo-debinding process was formulated considering the curing parameters and properties of other binder components. Variation of binder loss ratio, strength and carbon content of the specimens during thermo-debinding process was examined, and cemented carbide with high mechanical properties and high dimension precision was made by PIM.
Key words: powder injection molding; binder; tungsten cemented carbide; debinding
