The Strength and Hardness of Metal Matrix Composites by Binder Additives

摘要

20 vol.% aluminum borate whisker (Al{sub}18B{sub}4O{sub}33w) reinforced AC4CH alloy composite was fabricated by squeeze casting method. The matrix is controlled its impurities, which make metal alloys, especially AC4CH alloy that is made by restraining 0.2% Iron and aluminum to make a matrix material. The perform of composite materials was made from Al{sub}18B{sub}4O{sub}33w with 5% regulated three kinds of inorganic binders, SiO{sub}2, Al{sub}2O{sub}3 and TiO{sub}2 sol, respectively and then sintered at 1373K. The composites were obtained by squeeze cast infiltration of the molten alloy to the perform. Then it was squeeze casting into the matrix. The status of adhesions of whisker perform was Observed by SEM. Micro-Vickers hardness and tensile properties at the room temperature were estimated. Al{sub}18B{sub}4O{sub}33w/AC4CH composites containing TiO{sub}2 sol has excellent properties on tensile properties and micro-vickers hardness compared with the other composites without inorganic binder, containing SiO{sub}2 and sol inorganic binder.