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Total heat degreasing method for zirconia ceramic injection molding green body
The invention discloses a zirconia ceramic injection molding green body total thermal degreasing method, which comprises the following steps: uniformly mixing nano carbon powder and submicron alumina powder to obtain C/Al2O3 mixed powder, embedding a zirconia green body prepared by injection molding into the C/Al2O3 mixed powder, and carrying out thermal degreasing in air. According to the invention, a powder-buried total thermal degreasing process is adopted, the removal rate of a binder in the thermal degreasing process can be accurately regulated and controlled, the defects of bubbling, cracks and the like in the thermal degreasing process are reduced, large-particle alumina powder and small-particle nano carbon powder are distributed in a staggered manner to form good particle gradation, large particle gaps are provided, and the particle size distribution is uniform. Binder melt adsorbed in capillary tubes among carbon particles can continue to evaporate, decompose and release, and the problems that gas phases in green bodies are distributed unevenly due to small gaps of particles with single particle size, and the green bodies crack due to the fact that gas phase decomposition products are not easy to release are solved.
本发明公开一种氧化锆陶瓷注射成型坯体全热脱脂方法，将纳米碳粉和亚微米氧化铝粉混合均匀得到C/Al2O3混合粉末，再将注射成型制得的氧化锆坯体埋入C/Al2O3混合粉末中，在空气中进行热脱脂。本发明采用埋粉全热脱脂工艺，可以精确调控热脱脂过程中粘结剂的脱除速率，降低热脱脂过程中的鼓泡、裂纹等缺陷，其中，较大颗粒氧化铝粉与小颗粒纳米碳粉交错分布形成良好的颗粒级配，提供了较大的颗粒间隙，有利于吸附于碳颗粒之间毛细管中的粘结剂熔体继续蒸发和分解放出，避免了单一粒径颗粒间隙小产生的坯体内部气相分布不均匀、气相分解产物不易释放导致坯体开裂的问题。
Total heat degreasing method for zirconia ceramic injection molding green body
The invention discloses a zirconia ceramic injection molding green body total thermal degreasing method, which comprises the following steps: uniformly mixing nano carbon powder and submicron alumina powder to obtain C/Al2O3 mixed powder, embedding a zirconia green body prepared by injection molding into the C/Al2O3 mixed powder, and carrying out thermal degreasing in air. According to the invention, a powder-buried total thermal degreasing process is adopted, the removal rate of a binder in the thermal degreasing process can be accurately regulated and controlled, the defects of bubbling, cracks and the like in the thermal degreasing process are reduced, large-particle alumina powder and small-particle nano carbon powder are distributed in a staggered manner to form good particle gradation, large particle gaps are provided, and the particle size distribution is uniform. Binder melt adsorbed in capillary tubes among carbon particles can continue to evaporate, decompose and release, and the problems that gas phases in green bodies are distributed unevenly due to small gaps of particles with single particle size, and the green bodies crack due to the fact that gas phase decomposition products are not easy to release are solved.
本发明公开一种氧化锆陶瓷注射成型坯体全热脱脂方法，将纳米碳粉和亚微米氧化铝粉混合均匀得到C/Al2O3混合粉末，再将注射成型制得的氧化锆坯体埋入C/Al2O3混合粉末中，在空气中进行热脱脂。本发明采用埋粉全热脱脂工艺，可以精确调控热脱脂过程中粘结剂的脱除速率，降低热脱脂过程中的鼓泡、裂纹等缺陷，其中，较大颗粒氧化铝粉与小颗粒纳米碳粉交错分布形成良好的颗粒级配，提供了较大的颗粒间隙，有利于吸附于碳颗粒之间毛细管中的粘结剂熔体继续蒸发和分解放出，避免了单一粒径颗粒间隙小产生的坯体内部气相分布不均匀、气相分解产物不易释放导致坯体开裂的问题。
Total heat degreasing method for zirconia ceramic injection molding green body
一种氧化锆陶瓷注射成型坯体全热脱脂方法
ZHU JIACHENG (author) / QIAO LIANG (author) / ZHENG JINGWU (author) / YING YAO (author) / CHE SHENGLEI (author) / LI JUAN (author) / YU LIANG (author) / LI WANGCHANG (author)
2024-01-09
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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