SUGGESTIONS	CATALOGUE	MATERIALS & PROCESSES	COMPANY	NEWS	CONTACTS

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

				SILICON NITRIDE (Si3 N4)
		The product		Silicon nitride is produced by synthesis of silicon with nitrogen. It occurs in two usually coexisting crystalline phases, ALPHA and BETA.
		Properties		Excellent thermal shock resistance, low thermal expansion, good toughness.
		Applications		Thread guides for extreme stresses, super light; mechanical components extremely wear resistant, very light, with a remarkable dimensional stability.
		Production processes		Dry and isostatic pressing; injection moulding; hot 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 SILICIUM NITRIDE stabilized with Yttrium oxide MATERIAL CODE   BN-1 COLOUR   Dark grey SPECIFIC WEIGHT g/cm3 3,25 H20 ABSORPTION % 0 VICKERS HARDNESS (HV, 500g) GPa 17,5 COMPRESSIVE STRENGTH MPa 3200 FLEXURAL STRENGTH MPa 800 YOUNG’S MODULUS (E) GPa 300 FRACTURE TOUGHNESS (Kic) MPa m1/2 7 MAX. SERVICE TEMPERATURE °C 1300 THERMAL CONDUCTIVITY W / m K 33 THERMAL EXPANSION COEFFICIENT 20°C - 400°C x 10-6 / °C 2,4 20°C - 800°C x 10-6 / °C 4,3 Hot pressing technology allows to obtain superior mechanical properties.
		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 ≤ 0,6 µm; Satin Ra ≤ 0,4 µm; Polished satin Ra up to 0,3 µm; Diamond-polished Ra ≤ 0,1 µm.
		Some examples of microstructure		Polished, magnified 250X SEM micrograph. Ra 0.0909 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 ≤ 0,4 µm

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