陶瓷注射成型石蜡基粘结剂热脱脂行为研究
首发时间:2007-03-28
摘要:根据坏体及粘结剂热重曲线确立了热脱脂过程的两个过程并制定了相应的热脱脂升温制度。结果表明:按照该制度,在210℃时,保温480min,可将粘结剂中石蜡(PW)完全脱除。在陶瓷粉的粒度为0.2~0.4μm情况下,可得到直径为8.2mm无缺陷成型坯,并较大程度上缩短了脱脂时间,优化了脱脂工艺。化学动力学分析表明升温速率是胚体在脱脂过程中产生开裂等缺陷的决定性因素。
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Study on wax-based binder removal process of injection molded zirconia ceramics
Abstract:Based on the TGA-DTA curves of injection molded zirconia ceramic, the optimum debinding schedule is determined. Paraffin wax can be removed thoroughly by 8h at 210℃ in the term of given temperature increasing schedule. The experimental results also show that no debinding defects injection molded zirconia ceramics which the diameter is 8.2mm are gained when the zirconia powder average particle size is 0.2 to 0.4μm. According to the given debinding schedule the debinding time is greatly reduced and the technology is significantly optimized. The chemic kinetics analysis shows that temperature increasing rate, which leads to the debinding defects, is the crucial factor in the binder removal process.
Keywords: binder;kinetics;debinding
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No.1174810630711750****
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