Use of powder bath sintering for the fabrication of hard ceramic tools

Makireddi, D and Ghuge, VD and Behera, A (2021) Use of powder bath sintering for the fabrication of hard ceramic tools. In: Materials and Manufacturing Processes, 37 (2). pp. 160-168.

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Abstract

This article investigates the effect of ceramic powder bath heat-treatment on the sintering of α-alumina (α-Al2O3) for potential ceramic tool application. Three different ceramic sintering mediums were used i.e., (i) Pure alumina powder bath, (ii) Pure graphite powder bath, and (iii) Alumina Graphite Powder Bath (AGPB). The hardness and microstructural analysis were carried out using Vickers hardness, Field Emission Scanning Electron Microscopy (FESEM), and Scanning Electron Microscopy (SEM). The experimental results revealed that the novel Alumina Graphite Powder Bath (AGPB) sintering mechanism proposed in this research provided better hardness and microstructure as compared to the rest. The heating mechanism of alumina and graphite powder mixture was compared with published Thermogravimetric analysis (TGA) results. The Alumina Graphite Powder Bath (AGPB) sintering method improved the mean hardness and relative density by 23 and 13, respectively. Further, an orderly crystalline corundum microstructure with closed porosity was revealed from Scanning Electron Microscopy (SEM) micrographs. The conversion of convection-radiation to conduction mode of heat transfer in Alumina Graphite Powder Bath (AGPB) sintering technique was the reason behind this property enhancement.

Item Type:	Journal Article
Publication:	Materials and Manufacturing Processes
Publisher:	Bellwether Publishing, Ltd.
Additional Information:	The copyright for this article belongs to Bellwether Publishing, Ltd.
Keywords:	Aluminum oxide; Ceramic tools; Corundum; Field emission microscopes; Graphite; Heat transfer; Microstructure; Scanning electron microscopy; Sintered alumina; Thermogravimetric analysis; Vickers hardness, Alumina graphites; Ceramic sintering; Field emission scanning electron microscopy; Heating mechanisms; Microstructural analysis; Sintering mechanism; Sintering methods; Tool applications, Sintering
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	02 Sep 2021 09:09
Last Modified:	07 Jul 2022 04:51
URI:	https://eprints.iisc.ac.in/id/eprint/69638

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