Abstract
The preliminary experiments on the possibility of producing the “bone ash-magnesia porcelain” obtained by firing the mixture composed of bone ash, talc and quartzite were carried out. The properties investigated were the softening point, softening range, shrinkage, absorption, and the strength of the fired bodies.From the results it was found out that the bodies composed of 60-30% bone ash, 30-60% talc, and 10-20% quartzite are promissing. For example, the specimen No. 9 containing 50% bone ash, 40% talc, and 10% quartzite fired to cone 8 showed the particularly low dielectric loss together with the large expansion coefficient (Table 4).The investigations of the mineralogical constitution of the fired bodies by optical and X-ray methods revealed that β-tricalcium phosphate, diopside, and free silica (cristobalite and tridymite) were the principal minerals existing with a small amount of rhombic enstatite (proto-?) and glass matrix.The properties of the specimens containing kaolinite were also given.
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