SUGGESTIONS	CATALOGUE	MATERIALS & PROCESSES	COMPANY	NEWS	CONTACTS

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

				ALUMINA - ZIRCONIA
		The product		Aluminium oxide strengthened with zirconium oxide. Zirconium oxide is added to an aluminium oxide matrix to improve bending resistance, toughness and wear resistance. The very fine grain structure with its particular shape makes this material suitable for very fine yarns.
		Properties		High wear resistance, low friction coefficient, good heat conductor, good resistance to the cutting edge. E.g. for testurizeing machines with fairly aggressive yarns where titanium oxide is not hard enough.
		Applications		Thread guides with low friction coefficient and good wear resistance for very special delicate yarns.
		Production processes		Dry and isostatic pressing; injection moulding.
		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 CERMICS ALUMINIUM OXIDE - ZIRCONIUM OXIDE   MATERIAL CODE   BX-1 COLOUR   White SPECIFIC WEIGHT g/cm3 4,10 H20 ABSORPTION % 0 VICKERS HARDNESS (HV, 500g) GPa 16 COMPRESSIVE STRENGTH MPa 3100 FLEXURAL STRENGTH MPa 450 YOUNG’S MODULUS (E) GPa 380 FRACTURE TOUGHNESS (Kic) MPa m1/2 5,63 MAX. SERVICE TEMPERATURE °C 1400 THERMAL CONDUCTIVITY W / m K 29 THERMAL EXPANSION COEFFICIENT 20°C - 400°C x10-6 / °C 7,4 20°C - 800°C x10-6 / °C 8,8
		Dimensional tolerances		Standard tolerances: up to 10mm: ± 0.2mm, above 10mm: ± 2% Bending deformation: max. 0.5% of part length. Very close tolerances can be reached by grinding and polishing sintered parts, normally up to quality class IT8. Few microns tolerances can be achieved if needed. NEAR-NET SHAPE can be obtained by injection moulding reducing hard machining operations.
		Surface finishings		The sintered products are manufactured with the following surface finishings. Ground Ra from 0,6 to 1,6 µm; Satin Ra ≤ 0,8 µm; Polished satin Ra up to 0,5 µm; Diamond-polished Ra ≤ 0,2 µm.
		Some examples of microstructure		Polished, magnified 250X, SEM micrograph Ra 0.0580 µm Roughness metre: Gauss cut off 7*0.8mm, diamond tip cone 60° 2 micron The examples reported are indicative only. For further information please contact our technical staff.
		Friction coefficient		Friction coefficient diagram for material with Ra ≤ 0,3 µm

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