有機界面活性劑對氧化鋁陶瓷射出成形製程的流變行爲影響

Influence of Organic Surfactant on the Rheological Behavior of Injection-Molded Alumina Suspension

曾文甲

《華岡工程學報》 15期 (2001/06) Pp. 75-82

https://doi.org/10.29987/CCUHKJE.200106.0006

摘要

Effect of three different surfactants, namely, stearic acid (SA), oleic acid (OA) and 12-hydroxystearic acid (HSA), on the rheological properties of injection-molded alumina suspensions has been investigated over a temperature range of 120-150℃ and a shear-rate range of 1,000-l5,000s^(-1). The suspension mixtures exhibit a pseudoplastic flow behavior and a viscosity (η) order of η(subscript SA)＜η(subscript OA)＜η(subscript HAS) over the shear-rate range tested. A particulate network within the mixtures in a form of powder agglomerates was suspected to play a major role in the flow behavior observed, over which, different levels of powder agglomeration were resulted from the varying surfactants used. A model experiment by repeatedly shearing the suspensions under a fixed stress level partially confirmed the hypothesis. This suggests that the particle network restructured itself upon the shear was applied, leading to breakup of the network and improvements in the particle packing.

關鍵字

陶瓷射出成形 ； 氧化鋁 ； 潤滑劑 ； 表面吸附 ； 流變行爲

並列摘要

Effect of three different surfactants, namely, stearic acid (SA), oleic acid (OA) and 12-hydroxystearic acid (HSA), on the rheological properties of injection-molded alumina suspensions has been investigated over a temperature range of 120-150℃ and a shear-rate range of 1,000-l5,000s^(-1). The suspension mixtures exhibit a pseudoplastic flow behavior and a viscosity (η) order of η(subscript SA)＜η(subscript OA)＜η(subscript HAS) over the shear-rate range tested. A particulate network within the mixtures in a form of powder agglomerates was suspected to play a major role in the flow behavior observed, over which, different levels of powder agglomeration were resulted from the varying surfactants used. A model experiment by repeatedly shearing the suspensions under a fixed stress level partially confirmed the hypothesis. This suggests that the particle network restructured itself upon the shear was applied, leading to breakup of the network and improvements in the particle packing.

並列關鍵字

Ceramic Injection Molding ； Surfactant ； Rheology ； Agglomeration