Analysis and modeling of sintering of Sr-hexaferrite produced by PIM technology

• Published in: Science of sintering Vol. 43; no. 1; pp. 9 - 20
• Main Authors: Zlatkov, B S, Nikolic, M V, Zeljkovic, V, Obradovic, N, Pavlovic, V B, Aleksic, O
• Format: Journal Article
• Language: English
• Published: International Institute for the Science of Sintering, Beograd 01.01.2011
• Subjects: Binder removal; Binders; Injection molding; Mathematical models; Modeling; PIM technology; Powder injection molding; Shrinkage; Sintering; Sintering (powder metallurgy); Sr-hexaferrite; Strontium
• ISSN: 0350-820X; 1820-7413
• DOI: 10.2298/SOS1101009Z

Powder injection moulding (PIM) technology is becoming increasingly significant due to complex design possibilities and good repeatability. The technology requires optimisation of all steps starting with material and binder, injection, debinding and sintering parameters. Sintering is a key link in this technology. The PIM process is specific as, during feedstock injection, powder particles mixed into the binder do not come into mechanical contact. Shrinkage during sintering of PIM samples is high. The sintering process of isotropic PIM samples of Sr-hexaferrite was analysed and modelled. The Master Sintering Curve (MSC) principle was used to analyse sintering of two types of PIM Sr-hexaferrite samples, with completely removed binder and only the extraction step of the debinding procedure (thermal debinding proceeding simultaneously with sintering). The influence of the heating rate on resulting sample microstructures was also analysed. The influence of the sintering time and temperature was analysed using three different phenomenological equations.