Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 5

Processing and characterization of ceramic–metal composites obtained by centrifugal slip casting

10.15199/28.2016.5.6

nr katalogowy: 101853
10.15199/28.2016.5.6

Hollow shaped cylinders have been prepared from alumina-nickel composites with a gradient distribution of Ni by centrifugal slip casting method from water based slurries containing Al2O3 and Ni powders, and sintered at 1400°C in reducing N2/H2 atmosphere. No new phases like nickel aluminate spinel were revealed by X-ray diffraction in the Al2O3-Ni graded composites. Scanning electron microscopy (SEM) observations showed the presence of gradient distribution of Ni particles within the cross-section of the samples. Hardness tests confirmed that the nickel particles are distributed in the composite in a gradient way. Key words: composites, Al2O3-Ni, centrifugal slip casting.1. INTRODUCTION Since the 80’s of the XX century, the ceramic-metal composites aroused considerable interest primarily due to their properties [1]. Ceramic-metal composites are a group of materials that combine the following properties: high hardness, heat resistance and corrosion resistance [2, 3]. With the addition of the metallic phase we can obtain a noticeable improvement in fracture toughness, which allows a wider range of application than in case of monolithic ceramic materials. The ceramic matrix composites may find application such as ceramic gas turbine [4], a turbine blade [5] and others. The main mechanisms responsible for improvement of fracture toughness of the ceramic matrix composites reinforced with metal particles are: crack deflection path by metal particles, crack bridging, dislocation mechanism and in some cases phase transformation [1, 6÷9]. The strength of the interface between a ceramic matrix and a metal particles has got a crucial influence on the occurring type of mechanism [1]. The ceramic-metal composites may be produced by various methods such as infiltration of porous ceramics by liquid metal [10], slip casting method [11] and others. In this article the Al2O3-Ni composites produced by centrifugal slip casting (CSC) method were[...]

Bibliografia

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