Development of Fe-Cr-Co System Raw Material Black Glaze
Fe-Cr-Co system black glaze was trial-produced by using local kaolin and red mud containing iron and adding a small amount of transition metal compounds such as iron oxide,chromium oxide and cobalt carbonate under high-temperature oxidation atmosphere.The results showed that:red mud 20％,kaolin 14％,quartz 16％,potassium feldspar 27％,calcite 5.8％,talc 6.5％,Fe2O3 5.7％,Cr2O3 2.3％,and CoCO32.62％.At this time,the black glaze color and glossiness are the best,whiteness is the lowest 1.7％,gloss can reach 15.7％.The majority of the silicate minerals in the prepared black glaze transformed into glass phase structure,and no obvious crystallization was observed during the formation of the glaze layer.The black appearance was mainly caused by the superposition of the optical effects of Fe3+,Cr3+and Co2+ions under visible light.
Black glazeOxidation atmosphereGlossinessWhiteness
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