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Optimisation of thermal debinding from injection moulded ceramic parts

Optimiertes Entbindern von keramischen Spritzguß-Bauteilen
: Himpel, G.; Lenk, R.

Ceramic forum international : CFI. Berichte der Deutschen Keramischen Gesellschaft 74 (1997), No.7/8, pp.368-370
ISSN: 0173-9913
Journal Article
Fraunhofer IKTS ()
defect-free debinding; defektfreie Binderfreisetzung; endkonturgenaue Formgebung; injection moulding; near-net-shape forming method; Siliciumnitridkeramik; silicon carbide ceramics; Spritzguß; thermal binder removal; thermische Binderfreisetzung

A polyethylene-based binder system was used to injection moud SiC thread guides and test rods. The specimens, with wall thicknesses of 3 and 6 deg mm, had a solids volume content of 54 deg per cent and 51 deg per cent respectively. In preparing to remove the binder from the injection moulded parts, a thermal analytical examination of the binder system, ist components and the injection moulded bodies was made. In order to determine the shortest time/temperature curve for defect-free debinding, heating/temperature defect diagrams for both were drawn up. Through knowledge of the critical heating rarte/temperature relationship, the necessary debinding curves can set up dependent upon the thicknees of the parts. Defect-free debinding of the ceramic pieces is compared to debinding curves of thr powder metallurgy.