Effect of applied pressure on the Shirasu Balloon-Al-12%Si alloy composites produced by the pre-pack press pressure method

概要

論文の詳細を見る
The Shirasu Balloon, developed by Kyushu Government Industrial Research Institut eand produced from acidic volcanic ejecta and having a form of glassy hollow microsphere, has been used to produce Shirasu Balloon-Al composite by the pre-pack pressure casting method. Although it has many favourable properties such as light and heat resisting, heat insulating, and shock absorbing properties, this composite has less favourable mechanical properties.In the present study, effects of applied pressure in the pre-pack casting on the density and the mechanical properties of the composite have been examined. The main results obtained are as follows:(1) The larger applied pressure produces the better mechanical properties and the larger density.(2) The density of the composite is directly related to the strength of the Shirasu Balloons under the hydraulic pressure.(3) The impact strength is less sensitive to the applied pressure than the tensile and the transverse strength.(4) The maximum specific mechanical strength is obtained when 60kg/cm2 is applied for the composite with 150-297μ balloons, 40kg/cm2 for the with 297-420μ balloons and 20kg/cm2 for the with 420-590μ balloons.(5) The production of lighter and stronger composites requires the application of enough pressure to fill all the gap between the balloons with molten metal and the use of the strong balloons which can endure the high pressure to be required.
一般社団法人軽金属学会の論文