Abstract
Al2O3-10TiC composites were fabricated through the powder metallurgical process (mechanical milling combined with spark plasma sintering) with the addition of Ni/Nb as metallic binders. The effect of binder addition (Ni/Nb) on the processing, microstructure, and mechanical and tribological properties of the bulk-sintered composite samples was investigated. The microstructure of the composite reveals a homogeneous distribution of the TiC particles in the Al2O3 matrix. However, the presence of Ni/Nb was not traceable, owing to the small amounts of Ni/Nb addition. Hardness and density of the composite samples increase with the increasing addition of Nb (up to 2 wt. % Nb). Any further increase in the Nb content (3 wt. %) decreases both the hardness and the wear resistance. However, in case of Ni as binder, both the hardness and wear resistance increases with the increase in the Ni content from 1 wt. % to 3 wt. %. However, the composite samples with Nb as binder show improved hardness and wear resistance compared to the composites with Ni as binder.
Highlights
Ceramic materials are the preferred choice of materials for high temperature, wear resistance and high speed cutting applications because of their high melting points and remarkable hardness [1,2,3].Al2 O3 -based ceramic matrix composites are widely used in wear, corrosive, and high temperature environments due to their excellent properties such as high hardness, chemical stability, excellent wear resistance, and high temperature oxidation resistance [4,5,6]
The patterns do not show the presence of Ni/Nb peaks, which may be due to the low contents of Ni/Nb (
Al route with the addition of as as route with the addition Ni/Nb of Ni/Nb metallic additives
Summary
Ceramic materials are the preferred choice of materials for high temperature, wear resistance and high speed cutting applications because of their high melting points and remarkable hardness [1,2,3]. Al2 O3 -based ceramic matrix composites are widely used in wear, corrosive, and high temperature environments due to their excellent properties such as high hardness, chemical stability, excellent wear resistance, and high temperature oxidation resistance [4,5,6]. % TiC as a reinforcement to the Al2 O3 matrix can improve the hardness, fracture toughness, and thermal shock resistance of the composites [11,12]. Introducing ductile reinforcement into the ceramic matrix may effectively improve both the ductility and toughness of the ceramic matrix composites
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