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Factors affecting on properties of the injection-moulded W base compoiste
Author(s)
Tongsri, R.
Wila, P.
Yodkaew, T.
Lamlerttham, J.
Vetayanugul, B.
Date Issued
December 1, 2012
Type
Conference Paper
Abstract
Liquid phase sintering was employed for densification of injection-moulded specimens produced from tungsten base (W-(Ni, Cu, Co)) feedstock. Sintering of the brown parts, the specimens having polymer binders removed by using catalytic debinding, was conducted with varied sintering temperatures and times. It was found that at sintering temperatures lower that the optimum temperatures of 1450 °C, the binder metal elements (Ni, Cu, Co) distributed mainly in the binder phase which poorly wetted the tungsten grains. The speciemns sintered at low temperatures showed low tensile strengths and hardness. Under the optimum condition (temperature of 1450 °C and sintering time of 3 hr), Ni and Co still distributed in the binder phase while Cu content in the binder was reduced. Sintering the brown parts, at 1450 °C for longer than 3 hours, resulted in tungsten grain growth and porosity formation. Materials transport during tungsten grain coalescence caused porosity inside tungsten grains. Mechanical properties of the tungsten composite sintered for a long time were influenced mainly by porosity. Copyright © (2012) by Asian-Australasian Association for Composite Materials (AACM).
Citation
8th Asian Australasian Conference on Composite Materials 2012 Accm 2012 Composites Enabling Tomorrow S Industry Today, 1, 615-620, 2012