The fabrication and characterization of Al/SiC-MMC castings produced by vacuum assisted solidmould investment casting process

Abstract

In this paper, a promising manufacturing approach to cast metal matrix composites is proposed. In order to produce metal matrix composites by investment casting, SiC preforms were fabricated in 3D structure. Afterwards, A6063 aluminium alloy matrix material was infiltrated into preforms which were placed in the solid investment casting moulds with vacuum assistance. Preforms were characterized using Archimedes' test, scanning electron microscope anâ X ray diffraction analysis. Also, fabricated cast speci mens, were characterized using hardness tests, image analysis and scanning electron microscope observa tions. The results show that, in the vacuum assisted solidmould investment casting method; infiltration, of the preforms by molten metal was successfully achieved. Moreover, hardness of the composite higher than the matrix up to ratio of 100% by SiC reinforcement and T6 heat treatment.

Exploring of Polyvinylchloride / Silicon Carbide Nanocomposites Containing Different Amounts of SiC Nanoparticles

“…Since polymer and ceramic materials are two different types of materials, so it is normal that they do not make an interaction, especially SiC in low temperature only has distributed and may precipitate in some particular positions. It is not only in polymer, but also it is reported for the metal and semimetal-based composites contain SiC [50,51], however, in high temperature, SiC can interact with oxygen and form a more stable SiO2 layer that can affect the properties of the composite.…”

Aluminum Alloy Matrix Composite Reinforced with Metallic Glasses Particles Using Hot-Roll Bonding

“…В этих материалах в качестве армирующей добавки наиболее широко используют Al 2 O 3 или SiC в виде волокон или дискретных частиц [4][5][6][7]. Однако низкая прочность межфазной связи между упрочняющими частицами и матрицей может приводить к повышению пористости, снижению механических свойств и коррозионной стойкости [8,9], а разница в коэффициентах термического расширения -к образованию остаточных напряжений после термической обработки материалов [10,11].…”