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Micrograph 174 and full record

Link to image file for micrograph 174
Micrograph no
174
Brief description
Bone china (with sensitive tint plate)
Keywords
alumina Link to MATTER Glossary entry for alumina, bone Link to MATTER Glossary entry for bone, ceramic Link to MATTER Glossary entry for ceramic, hydroxyapatite Link to MATTER Glossary entry for 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.
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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