Sintering and mechanical properties of β-wollastonite
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Detailed microstructural studies have been carried out on porous β-wollastonite (CaSiO3) ceramics with 40–60% of the theoretical density. Xonotlite (Ca6Si6O17(OH)2) was used as starting material, and the reaction and sintering behaviour were systematically examined in the range 800–1200 °C in air. Analysis of the mechanical properties showed that the strength degradation of β-wollastonite ceramics was certainly induced by the change of microstructure. Isothermal annealing at 1100 °C, however, did not preferentially affect the microstructure or the mechanical properties of sintered β-wollastonite. These observations lead to the conclusion that the measured bending strength and Vickers hardness of porous β-wollastonite ceramics can be substantially modified and improved by controlling the microstructure, in particular due to the shape of randomly oriented grains in the matrix.
KeywordsPolymer Microstructure Mechanical Property Material Processing Vickers Hardness
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