Mechanical properties of three-dimensional interconnected alumina/steel metal matrix composites
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Three-dimensional interconnected alumina/steel metal matrix composites (MMCs) were produced by pressureless Ti-activated melt infiltration method using three types of Al2O3 powder with different sizes and shapes. By partial sintering during infiltration an interpenetrating ceramic network was realised. The effect of the ceramic particle size and shape on the resulting ceramic network, volume % fraction and the MMC properties is presented. The MMCs were characterised for mechanical properties at room temperature and elevated temperature. An increase in flexural strength and Young’s modulus with decreasing particle size has been observed. In addition, the effect of the volume of ceramic content and the surface finish of the MMCs on the wear behaviour is shown.
KeywordsFlexural Strength Wear Behaviour Ceramic Particle Al2O3 Particle Fracture Origin
The authors would like to thank R. Bächthold and Dr. G. Blugan at Empa, Materials Science and Technology, Switzerland as well as T. Minghetti and C. Schelle at RUAG Components, Switzerland for their contributions to this work.
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