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Experimental Investigations on Microwave-Current Assisted Sintering Process and Oxidation of Graphite Die at High Temperature

Al-Jothery, H.K.M. and Albarody, T.M.B. and Megat-Yusoff, P.S.M. and Al-Shaibani, N. and Mohammed, H.G. (2021) Experimental Investigations on Microwave-Current Assisted Sintering Process and Oxidation of Graphite Die at High Temperature. International Journal of Automotive and Mechanical Engineering, 18 (2). pp. 8781-8789.

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Abstract

In the current-assisted sintering technique, graphite is mainly used to fabricate die and other components (such as electrodes and spacers) because of its excellent thermoelectric properties, high melting point and high ratio of the tensile strength to the compressive strength. As widely known, graphite is one of the brittle materials, and the failure is difficult to be anticipated before it happens. Besides, there is a lack of information about the effects of sintering process, environment and impurity on the graphite structure of the furnace, especially the die, which is the weakest part of the graphite structure. Therefore, the effects of electrical field and oxidation on the graphite die of microwave-current assisted sintering apparatus were investigated at a high temperature of 600�1900°C based on physical characteristics and mechanical strength. In this article, the spark discharge phenomenon was experimentally proved during the sintering process of nonconductive material. The tensile strength of the upper punch after the sintering process was 20.2 higher than the pristine one because of the transforming of micro-graphite to carbon nanotubes which increased with increasing the temperature. On the other hand, the tensile strengths of graphite lower punch and sleeve were slightly dropped. While, the oxidation of GW-6S graphite in the air caused a mass loss that led to the reduction in tensile and compressive strengths. © The Authors 2021. Published by Penerbit UMP. This is an open access article under the CC BY license.

Item Type:Article
Impact Factor:cited By 0
Uncontrolled Keywords:Compressive strength; Electric discharges; Graphite; Graphite electrodes; Oxidation; Tensile strength, Electrical field; Experimental investigations; Graphite structures; High melting point; Non-conductive materials; Physical characteristics; Sintering process; Thermoelectric properties, Sintering
ID Code:23705
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:19 Aug 2021 09:14
Last Modified:19 Aug 2021 09:14

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