The effect of different fluxing agents on the sintering of dry pressed porcelain bodies

The aim of the article is to find the optimal fluxing agent for porcelain body regarding to the possibility of the lowest firing temperature. Sintering behaviour of dry pressed test samples made from the mixture of kaolin and three different types of industrially milled feldspar rocks, bone ash and quartz sand with similar granulometry as dependence of water absorption on the firing temperature was investigated. The most intensive fluxing agent for the sintering is bone ash—the mixture containing bone ash (20wt.%) showed sintering temperature 1200°C. That is about 50°C lower compared with the most intensive feldspar based fluxing agent—potassium feldspar rock containing 75% of pure microcline.