注射成形AlN高导热陶瓷蜡基粘结剂

来源期刊：中南大学学报(自然科学版)2001年第5期

论文作者：林健凉 曲选辉 秦明礼 钟孝贤

文章页码：498 - 502

关键词：AlN;陶瓷粉末注射成形;粘结剂

Key words：aluminum nitride; ceramic powder injection molding; binder

摘    要：研究并开发了一种适合于AlN陶瓷注射成形的蜡基多聚合物粘结剂.通过理论计算分析了所用粘结剂组元的热力学相容性,利用毛细管流变仪测量了喂料的流变性能,通过热重分析方法研究了粘结剂的热分解行为,有效地指导了脱脂工艺的设计,并通过考察不同温度下的脱脂形貌研究了脱脂工艺的合理性.研究结果表明:当粉末装载量为61%时(体积分数),该粘结剂体系和粉末能够均匀、顺利地混合,喂料的流变因子范围为0.70~0.76(150℃),体现出典型的假塑性流体特征并具有良好的注射性能;喂料有一定的温敏性,但是对注射压力的变化不敏感,最佳注射温度范围为150~160℃;该多聚合物粘结剂在脱脂过程中能够起到优良的形状维持作用,对于厚度在8mm的AlN零件,热脱脂总时间为60 h左右;该粘结剂体系是一种性能优异、适合于AlN陶瓷注射成形的粘结剂.

Abstract: A wax based polymer binder suitable for CIMof aluminumnitride is studied in the paper. The thermal miscibility of the binder is researched into in theory. The rheological properties of feedstock prove that the AlN powder and binder can be mixed in 61%(volume fraction) powder loading freely. The rheological index ranges from 0.70 to 0.76 which shows that rehological model of the mixture belongs to pseudoplastic which has good injection ability. The best injection temperature ranges from150~160℃. The reasonable debinding cycle is determined on observingt he TGA plot of binder by analyzing the microstructure at different debinding temperature. The binder has excellent shape retention ability during the debinding process. The total debinding time is about 60 h for AlN sample with a thickness of 8 mm.