Investigation of mechanical properties and microstructure when processing alumina-based cutting tool under different pressure using cold isostatic pressure (CIP)

Adam, Nur Ashikin (2018) Investigation of mechanical properties and microstructure when processing alumina-based cutting tool under different pressure using cold isostatic pressure (CIP). Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Ceramic cutting tool are the most commonly used in machining operation especially in dry condition. The advantages of ceramic such as high hot hardness and high refractoriness enable this cutting tool to be applied in machining various hardened steels. The process of producing the cutting tool by using powder technology is a one method that widely used for fabricate a ceramic cutting tool material. In this study, increasing the alumina-based ceramic density is the focuses to improve the performance of properties with four difference pressure it is non CIP, 250 MPa, 300 MPa and 350 MPa using the Cold Isostatic Press (CIP) machine. Therefore, the effect of the CIP profile is investigate to produce end product that have characteristics such as good microstructure, high strength and high density. Spray dried alumina powder was used as a main material to produce the cutting tool. It involves three main methods where the first methods is prepared the raw material of a micrometer and mixed using ball milling about 12 hours. Then the second process, the powder will be pressed using hydraulic press at 5 tons before compressed through CIP at non pressure, 37000 psi, 44000 psi, and 51000 psi. Next process, the green body will be dried and sintered at 1400 °C for 9 hours. The final product that has been produced will be evaluate as ceramic mechanical properties such as relative density measurement, Vickers hardness tests, shrinkage measurement and microstructural studies at the sample either suitable for its use as a cutting tool. This study also allows the industries to understand how to fabricate their own cutting tool for better feasibility in machining.

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