A simple model for viscosity of powder injection moulding mixes with binder content above powder critical binder volume concentration

• Published in: Journal of the European Ceramic Society 2000-11, Vol.20 (12), p.2183-2190
• Main Authors: Janardhana Reddy, J., Ravi, N., Vijayakumar, M.
• Format: Article
• Language: English
• Subjects: Al 2O 3; Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Exact sciences and technology; General studies; Injection moulding; SiO 2; Technical ceramics; Viscosity
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/S0955-2219(00)00096-0

A simple model is proposed for the variation of viscosity of powder injection moulding mixes with binder content above Critical Binder Volume Concentration (CBVC), a characteristic of powder. Coarse silica and fine alumina powders are mixed with different types of low viscosity binders at different binder proportions. The viscosities of these mixes are measured by capillary rheometry with a special die at different shear rates. The CBVC values of the powders estimated by the model from the viscosity data of the mixes are matching with those values arrived from the experimental torque rheometry and temperature measurement methods. The proposed model has shown excellent correlation between the calculated and experimentally measured viscosity data at different shear rates, binder contents with different binders and powders. The model also gave precise CBVC values with the viscosity data of the previous authors validating the model to other powders and binders. The model is useful for the prediction of viscosity of PIM mix with known binder content, viscosity of binder and CBVC of the powder.