Injekční vstřikování a slinování CeO2 keramiky

Injection Moulding and Sintering of Ceria Ceramics

journal article - other

en

Ceria powder was dry-milled to sub-micrometric particle sizes and used in the preparation of ceramic mixture for injection moulding. Specimen bodies were injection moulded in the shape of rectangular bars. The sintering kinetics of these bodies was studied in a dilatometer under various sintering conditions and also by the rate-controlled sintering method. Sintering the injection moulded CeO2 to a density of 7.08 g.cm-3 (99.3% TD) was possible already at a temperature of 1400C, and the highest density value (99.8% TD) was obtained at a heating rate of 2C.min-1 and a holding time of 1 hour at 1500C. Using heating rates of over 5C.min-1 had an adverse effect on the density obtained. Applying the rate-controlled sintering (RCS) method did not lead to any decrease in the grain size if compared with temperature-controlled sintering (TCS).

CeO2 prášek byl mlet za sucha na submikrometrovou velikost a poté použit pro přípravu směsí pro injekční vstřikování. Injekčně vstřikované vzorky měly tvar hranolů. Kinetika slinování byla studována vysokoteplotní dilatometrií za různých podmínek a také metodou "rate controlled sintering" (RCS). Slinutí vzorků do hustoty 7,08g/ccm (99,3%) bylo možné už za teplot 1400C, nejvyšší hustoty (99,8%) bylo dosaženo při slinování rychlostí 2C/min s prodlevou 1 hodina na 1500C. Použití rychlostí ohřevu vyšších než 5C/min mělo negativní vliv na konečné dosažené hustoty. Použití metody RCS nevedlo k mikrostrukturám s menší velikostí zrn.

Ceria powder was dry-milled to sub-micrometric particle sizes and used in the preparation of ceramic mixture for injection moulding. Specimen bodies were injection moulded in the shape of rectangular bars. The sintering kinetics of these bodies was studied in a dilatometer under various sintering conditions and also by the rate-controlled sintering method. Sintering the injection moulded CeO2 to a density of 7.08 g.cm-3 (99.3% TD) was possible already at a temperature of 1400C, and the highest density value (99.8% TD) was obtained at a heating rate of 2C.min-1 and a holding time of 1 hour at 1500C. Using heating rates of over 5C.min-1 had an adverse effect on the density obtained. Applying the rate-controlled sintering (RCS) method did not lead to any decrease in the grain size if compared with temperature-controlled sintering (TCS).

ceria, injection moulding, sintering

2002

01.01.2002

Elsevier

0272-8842

Ceramics International

28

3

8