Use of Wollastonite as a Flux for Bone China Bodies

Table 1

Chemical composition and phase analysis of raw materials.

wt %	Kaolin	Calcined bone ash	Potassic feldspar	Wollastonite
SiO2	46.96	0.65	66.2	47.61
Al2O3	38.05	0.8	16.54	0.11
Fe2O3	0.46	0.12	0.15	0.14
MgO	—	1.1	—
CaO	0.02	52.2	0.36	48.66
Na2O	0.03	2.1	0.89
K2O	1.14	0.07	14.66	0.03
TiO2	0.03	—	0.03	—
P2O5	0.11	40.5	0.15	—
Others	0.03	0.2	0.64	0.35
LOI	13.2	2.3	0.38	3.1
	Kaolinite		Quartz
Major phases	Quartz	Hydroxyapatite	Microcline	Wollastonite
	Muscovite		Albite