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Crystalline Glazes

Another type of crystals is the willemite crystals. Willemite is a rare zinc mineral (Zn2Si04). In order to get these crystals, zinc is added. The zinc addi-hon is controlled, as it reduces the viscosity of the molten glaze. Zinc acts as a modifier in the glaze. [Pg.267]

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. [Pg.421]

Household window glass will eventually form crystals of devitrite, an orthorhombic crystal with a formula like NaiCasSisOie, these crystals usually form at the surface first. Crystalline glazes, which can make a pot look so spectacular, actually rely on spherulites consisting of many willemite (Zn2Si04) crystals, with each acicular crystal growing in the [001] direction, to achieve the effect. (More on this topic in is presented in Section 21.11.)... [Pg.281]

Creber, D. (2005) Crystalline Glazes, A C Black, London. One of the Ceramic Handbooks series. [Pg.397]

Ilsley, P. (1999) Macro-Crystalline Glazes The Challenge of Crystals, The Crowood Press, Ramsbury, Wilts, UK. Beautiful illustrations from an experimentalist. [Pg.398]

Willemite. Zn2Si04 formed in crystalline glazes that are loaded with ZnO. [Pg.356]

Polycarbonates. Polycarbonates (qv) are pardy crystalline thermoplastics with some disorder in the crystalline part and considerable order in the amorphous part. This disorder conveys high impact strength which, combined with its good transparency and outdoor exposure resistance, makes polycarbonates usefiil for vandal-resistant glazing and outdoor lighting. It is easily processed by extmsion and injection mol ding. Various uv and dame-retardant agents are often added. [Pg.327]

Glazing Agent 905 Micro-crystalline wax 20 37th Series 828, p 24, 1992... [Pg.271]

When the glaze cracks, it cracks in an irregular pattern. There are no flat planes in the resulting pieces. This indicates a lack of atomic crystalline structure. [Pg.196]

See other pages where Crystalline Glazes is mentioned: [Pg.272]    [Pg.261]    [Pg.215]    [Pg.391]    [Pg.398]    [Pg.80]    [Pg.142]    [Pg.551]    [Pg.391]    [Pg.398]    [Pg.796]    [Pg.267]    [Pg.187]    [Pg.272]    [Pg.261]    [Pg.215]    [Pg.391]    [Pg.398]    [Pg.80]    [Pg.142]    [Pg.551]    [Pg.391]    [Pg.398]    [Pg.796]    [Pg.267]    [Pg.187]    [Pg.162]    [Pg.261]    [Pg.139]    [Pg.202]    [Pg.139]    [Pg.120]    [Pg.422]    [Pg.169]    [Pg.40]    [Pg.114]    [Pg.426]    [Pg.20]    [Pg.152]    [Pg.818]    [Pg.289]    [Pg.25]    [Pg.144]    [Pg.244]    [Pg.819]    [Pg.261]    [Pg.180]    [Pg.198]    [Pg.157]    [Pg.7]   


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