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Tetragonal and monoclinic phase transformation of ZTA-MgO ceramic cutting tool by machining process

Mohd Ali, Afifah and Ahmad Azhar, Ahmad Zahirani and Shah Abdullah, Norazharuddin and Ratnam, Mani Maran and Ahmad, Zainal Arifin (2017) Tetragonal and monoclinic phase transformation of ZTA-MgO ceramic cutting tool by machining process. In: International Conference of X-Ray and Related Techniques 2016 (ICXRI 2016), 17th-18th August 2016, Dorsett Hotel, Putrajaya.

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Abstract

The purpose of this study is to investigate the phase transformation route of ZTA-MgO ceramic cutting tool in raw powder form, after sintering process and after machining process. This is to evaluate the effect of phase transformation to the properties of the cutting tool i.e. hardness and fracture toughness. Samples of ZTA-MgO ceramic cutting insert were fabricated by wet mixing the materials, and then dried at 100 °C before crushed into powder. The powder was pressed into rhombic shape and sintered at 1600 °C at 4 h soaking time to yield dense body. To study the effect of the phase transformation of the fabricated tool, machining was performed on the stainless steel 316L at 2000 rpm cutting speed. XRD analysis was performed on three types of ZTA-MgO samples which were the raw powder, the sintered samples and also the samples after machining process. Results shows that the m-ZrO2 reduced to 0% when sintering process take place and reappear at 12% when the machining process take place proving the occurrence of transformation toughening during the machining process. The consequence of this condition is the hardness of the samples increased by 22% while the fracture toughness decreased by 21.1%.

Item Type: Conference or Workshop Item (Plenary Papers)
Additional Information: 7676/55731
Uncontrolled Keywords: Ceramic Tool, Machining, Toughening, ZTA
Subjects: T Technology > T Technology (General) > T175 Industrial research. Research and development
T Technology > TA Engineering (General). Civil engineering (General) > TA213 Engineering machinery, tools, and implements
T Technology > TA Engineering (General). Civil engineering (General) > TA401 Materials of engineering and construction
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User: Dr. Afifah Mohd. Ali
Date Deposited: 25 Apr 2017 15:56
Last Modified: 23 Nov 2017 15:51
URI: http://irep.iium.edu.my/id/eprint/55731

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