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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 Abdullah, Norazharuddin Shah and Ratnam, Mani Maran and Ahmad, Zainal Arifin (2017) Tetragonal and monoclinic phase transformation of ZTA-MgO ceramic cutting tool by machining process. Materials Science Forum, 888. pp. 108-111. ISSN 1662-9752

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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-ZrO 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: Article (Journal)
Additional Information: 7676/70278
Uncontrolled Keywords: Toughening, ZTA, Ceramic tool, Machining
Subjects: T Technology > TJ Mechanical engineering and machinery
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User: Dr. Afifah Mohd. Ali
Date Deposited: 29 Mar 2019 09:32
Last Modified: 12 Jul 2019 12:03
URI: http://irep.iium.edu.my/id/eprint/70278

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