中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 7 July 2012 |
（Department of Metallurgy and Materials Engineering, Yildiz Technical University,
Davutpasa Campus, TR 34210, Esenler, Istanbul, Turkey）
Abstract:Production of A6063/SiC-B4C hybrid composite using vacuum assisted block mould investment casting was investigated. Firstly, SiC-B4C hybrid preforms were fabricated in cylindrical shape. The preferred mean particle size of the SiC and B4C powders were 60 µm and 55 µm respectively. In early experiments, single powder ratio of 85% SiC and 15% B4C was selected to produce the tough preforms. Subsequently, the preforms were placed into the cylindrical shape gypsum bonded block investment moulds and A6063 alloy was infiltrated into the preforms using vacuum assisted (-105 Pa) casting machine. Porosity fraction of preforms was determined using Archimedes’ test. The fabricated cast specimens were characterized using hardness tests, image analysis and SEM observations and EDX analysis. The result indicates that, by the vacuum assisted block mould investment casting technique, the infiltration of the preforms by molten metal was successfully realized.
Key words: AlMMC; SiC; B4C; investment casting; hybrid preform
