SUGGESTIONS	CATALOGUE	MATERIALS & PROCESSES	COMPANY	NEWS	CONTACTS

GLAZED HARD PORCELAIN TITANIUM OXIDE ALUMINIUM OXIDE ALUMINA - ZIRCONIA ZIRCONIUM OXIDE SILICON CARBIDE SILICON NITRIDE PRODUCTION PROCESSES

				GLAZED HARD PORCELAIN with high aluminium content
		The product		Porcelain is obtained from sintering of various minerals such as clay, kaolin, feldspar, and quartz, with the addition of alumina.
		Properties		Good mechanical properties and electrical insulation: it is used glazed.
		Applications		Thread guides for delicate threads and medium-low stresses, without high dimensional precision.
		Production processes		Extrusion; dry and wet pressing; isostatic pressing.
		Technical data		The following table gives physical and mechanical data. Material data are obtained from specimens according to international test specifications. The indicated values can't be extended to components and parts with different shapes and surface finishings. Bettini S.r.l. reserves the right to make technical modifications. BETTINI CERAMICS PORCELAIN MATERIAL CODE   PO COLOUR   White SPECIFIC WEIGHT g/cm3 2,65 H20 ABSORPTION % 0 VICKERS HARDNESS (HV, 500g) GPa - COMPRESSIVE STRENGTH MPa - FLEXURAL STRENGTH MPa 150 YOUNG’S MODULUS (E) GPa 160 FRACTURE TOUGHNESS (Kic) MPa m1/2 - MAX. SERVICE TEMPERATURE °C 800 THERMAL CONDUCTIVITY W / m K 3 THERMAL EXPANSION COEFFICIENT 20°C - 400°C x10-6 / °C 5,5 20°C - 800°C x10-6 / °C 5,8
		Dimensional tolerances		Standard tolerances: up to 10mm: ± 0.2mm, above 10mm: ± 2% Bending deformation: max. 0.8% of part length
		Surface finishings		Porcelain is used with glazed surfaces. The glaze is designed to increase the object’s mechanical resistance. In fact it pre-stresses the piece and reduces its porosity, thus lowering roughness and the friction coefficient. Bettini glaze is a ceramic mixture of high hardness, very resistant to wear of natural and synthetic fibres.

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