Effect Of Sintering Temperature And Soaking Time On Microstructure And Mechanical Properties Of Alumina-Chromia Cutting Tool

Abdul Aziz, Nurul Hidayah (2019) Effect Of Sintering Temperature And Soaking Time On Microstructure And Mechanical Properties Of Alumina-Chromia Cutting Tool. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In this study, alumina based cutting tool was fabricated with addition of chromia (Cr₂O₃). Generally, alumina-based ceramic requires high sintering temperature to improve its toughness obtained a cutting tool with good mechanical properties. The aluminachromia cutting tool were fabricated using powder processing technique. The powder of alumina and chromia were mixed, compacted and sintered at different sintering temperature; 1500°C, 1600°C and 1700°C respectively, with soaking time of 4 hours, 5 hours and 6 hours. The study is focussed on evaluating the appropriate sintering temperature and soaking time when fabricated Alumina-Chromia cutting tool based on density and tribology. The microstructure and hardness of fabricated cutting tool based on maximum and minimum density were investigated. The intent of this research is to develop regression model focused on the relationship between parameter (sintering temperature and soaking time) and product outcome (density and tribology) using full factorial design. Analysis of variance (ANOVA) were employed to identify significant factors that influenced the density and tribology by using Design Expert 6.0 analysis software. The ANOVA analysis shows that for density and tribology, most influenced parameter was sintering temperature followed by soaking time. The highest hardness value recorded at 1700°C for 4 hours. A fine microstructure condition was produced at 1700°C for 4 hours. This study gives better understanding on how the sintering temperature and soaking time affect the microstructure and mechanical properties of cutting tool to produce high performance cutting tool

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