Glazes wollastonite

Crystalline glazes contain large crystals which render the surface matt and even attain discernible sizes. They find application mostly in ceramic artware. A matt surface is usually developed by anorthitc or wollastonite crystals which crystallize from glazes of suitable compositions. Additions of ZnO or Ti02 also create a matt surface. 

Ferric oxide Pigment green 8 Ultramarine blue Wollastonite pigment, ceramic coatings Lead chromate pigment, ceramic glazes Cadmium Cadmium sulfide Lead carbonate basic... 

Synthetic raw materials include precursors of glazes (lead oxide, barium carbonate, tin oxide) and special ceramic masses (alumina, zirconia, magnesia), as well as hydrothermally synthesized wollastonite and diopside, and synthetic days such as kaolinite with very narrow grain size distribution and high plastidty for high-performance ceramics. Wet chemical techniques such as coprecipitation, freeze-and spray-drying, and sol-gel synthesis are also applied to produce raw materials for special appHcations. 

Among the many other ceramic applications in which wollastonite can be used are glazed porous ceramics of nearly every kind, dinnerware, ovenware, artware, structural clay products, terra cotta, sanitaryware, chemical stoneware, ceramic-bonded abrasives, refractories, high alumina bodies, spark plugs, electrical porcelains, frits and investment castings. 

Historically, polycarbonate has had its greatest use in clear parts, such as glazing. But its excellent properties are leading to its use in small kitchen appliances. It is usually not reinforced, but wollastonite imparts some benefits as shown in Table 16. 

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