Full Record for Micrograph 173
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- Micrograph no
- 173
- Brief description
- Bone china, showing the glaze on the surface (with sensitive tint plate)
- Keywords
- alumina , bone , ceramic , hydroxyapatite , silica
- Categories
- Ceramic
- System
- Bone china
- Composition
- China clay 25, stone 30, bone 45 (wt% typical)
- Standard codes
- Reaction
- Processing
- Made from china clay, bone which has been calcined to around 1000ºC, and stone, which undergo a complex series of reactions on firing to produce a new assemblage of crystals in a glassy matrix.
- Applications
- Crockery
- Sample preparation
- Thin section
- Technique
- Transmitted polarised light microscopy, with sensitive tint plate
- Length bar
- 250 μm
- Further information
- China clay consists mainly of SiO2 and Al2O3, and is valued for its whiteness (which is due to the low iron oxide content). Bone consists mainly of hydroxyapatite, Ca5(PO4)3OH, and the source supply is mainly ox bone. The glaze is mostly SiO2, and is applied to render the surface impermeable to liquids and gases, to provide a readily cleanable surface which protects the china, and to provide an aesthetically pleasing coating.
- Contributor
- Dr K M Knowles
- Organisation
- Department of Materials Science and Metallurgy, University of Cambridge
- Date
- 09/08/02
- Licence for re-use
- Attribution-NonCommercial-ShareAlike 4.0 International
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