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

				TITANIUM OXIDE
		The product		Bettini produces two titanium oxide types: titanium dioxide TiO2, yellow coloured, and titanium trioxide Ti2O3, an electrical conductor black coloured.
		Properties		Low friction coefficient, good electrical conductivity for the black trioxide, good mechanical and wear resistance.
		Applications		Thread guides for delicate yarns and for mid-high stresses with a surface to be mirror polished. It is necessary for texturizing machines. The black one, trioxide, is suitable to dissipate electrostatic charges from yarns on various textile machines, e.g. knitting machines.
		Production processes		Extrusion; 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 CERAMICS TITANIUM OXIDE MATERIAL CODE   BT-7 BT-8 COLOUR   Yellow Black-blue SPECIFIC WEIGHT g/cm3 4,00 4,00 H20 ABSORPTION % 0 0 VICKERS HARDNESS (HV, 500g) GPa 7,5 7,5 COMPRESSIVE STRENGTH MPa - - FLEXURAL STRENGTH MPa 150 150 YOUNG’S MODULUS (E) GPa - - FRACTURE TOUGHNESS (Kic) MPa m1/2 - - MAX. SERVICE TEMPERATURE °C 1000 1000 THERMAL CONDUCTIVITY W/ m K 8 8 THERMAL EXPANSION COEFFICIENT 20°C - 400°C x 10-6 / °C 8,0 8,0 20°C - 800°C x 10-6 / °C 8,7 8,7
		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 ≤ 1,2 µm; Polished satin Ra up to 0,5 µm; Diamond-polished Ra ≤ 0,3 µm. For delicate yarns with a medium wear value and for synthetic yarns, before texturizing titanium oxide is used with polished finishing. For synthetic yarns or continuous fibres when there is a risk of electrostatic charging, black titanium oxide is used (good electrical conductivity).
		Some examples of microstructure		Polished, magnified 250X, SEM micrograph. Ra 0.0923 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 ≤ 0,2 µm

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