高圧鋳造法によるチタン酸カリウム・ウィスカ強化アルミニウム合金の製造

概要

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Squeeze casting of potassium titanate whisker reinforced 6061 aluminum alloy matrix composites was examined. Effects of distribution of whisker in a preform was varied by a milling of whisker in water and by the surface activation treatment of whisker during stiring in water by adding surface activation agent. The surface activation treatment is proved to be the best treatment for make uniform distribution of whisker in a preform, i.e. in a composite. Then, this treatment increased the tensile strength up to 350 MPa and the Youngs modulus up to 92 GPa and reduced the thermal expansion coefficient down to 16×10<SUP>-6</SUP> /K. These properties are desiarble for industrial uses of aluminum matrix composite combined with the low cost of composite. Silica binder used to fix the whisker preform was reacted aluminum melt during casting and dis-appeared from the FRM. Instead, small particles of alumina was formed on the whisker by the reaction between whisker and aluminum.
社団法人粉体粉末冶金協会の論文