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Wpływ bioaktywnych dodatków ceramicznych na spiekanie porowatego kompozytu na osnowie stopu Co-Cr-Mo

Oksiuta Z., Dąbrowski J.

Kompozyty

2002

R. 2, nr 4

195-198

Przedstawiono wyniki badań otrzymywania porowatych materiałów kompozytowych na bazie stopu implantacyjnego Co-Cr-Mo typu Vitalium z zawartością dwóch dodatków bioaktywnych: fosforanu wapnia Ca3(PO4)2 oraz bioszklu AP40. Zbadano gęstość, strukturę i mikrotwardość spiekanych wyprasek. W wyniku reakcji pomiędzy cząstkami metalicznej osnowy a ceramiką w strukturze stopu pojawiła się eutektyka.

In this work introduced the results of investigations receiving of porous composites materials base on Co-Cr-Mo implantation alloy with contents of 3%, 6.5% and 10 wt.% of additions: Ca3(PO4)2 - aTCP and bioactive glass - AP40. One examined density, structure and microhardness of sintered compacts. From the compactibility data appears (Fig. 1), that higher density of samples received in case of material with the aTPC addition. Together with height of weight additions density of compacts decrease. It have not been possible to receive good quality of samples with content of 10 wt.% addition. The results of sintering process under argon atmosphere at the temperature 1150°C for 1 hour testify, that samples with 6.5 wt.% of addition has not been sintered well. Sintering at the temperature 1250°C, in the same period of time (Fig. 2), caused slight increase of samples density. Effect of specimen sintering is the most strongly visible in case of composites with 3% of additions. The smaller dimensional changes have been observed in compacts with AP40 addition. The samples at 10 wt.% of TCP and AP40 addition after sintering received slight height of volume (swelling). The analysis of microstructure of sintered samples (Figs 3, 4) has revealed that in case of compositions with aTCP powders in structure one can observed new eutectic phase. Increase of contents of ceramics or glass additions cause the quantity of this eutectic phase grows up too. The similar picture of structure have been observed in photographs with AP40 samples, but contents of phase eutectic in these kind of specimens is clearly greater (Fig. 4). From microhardness measurements results indicates (Fig. 5), that with increasing of content additions the microhardness rises. Samples sintered with aTCP powder, in spite of higher value of density, obtained lower hardness. This effect is probably join with samples of structure (observed higher contents of eutectic phases in case of samples with AP40 addition).