鋳造法によるシリカ/Al-20wt%Mg複合材の摩耗特性

概要

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The wear properties of particle dispersion composite alloys, made by addition of ceramic particles during agitation of alloy liquid, was investigated to improve the anti-seizure properties. Particles of SiO2, Al2O3 and MgO were used. The volume fraction range of SiO2 were from 8.7% to 52.8% in this paper. The sliding wear characteristics were examined in dry and in air atmosphere conditions with a specimen pin versus a mated disk of annealed 0.6%C steel. It was easy to produce the SiO2 composite castings. But the production of the Al2O3 or MgO composite castings were difficult. Then they were not used for the wear test. The wear rate of castings containing 200μm diameter SiO2 particle over 8.7vol%, was about one fifth of that of the matrix at high sliding speeds. The friction force of specimens containing over 30vol% SiO2 also decreased and the features of seizure were not observed. The wear rate and the friction force of the composite containing particles up to 40vol% increased due to the abrasion at lower sliding speed. The 50vol% SiO2 composite castings exhibited on excellent wear resitance. The wear rate of the composite castings containing 50μm SiO2 was large at higher sliding speed because of their poor ability to prevent plastic flow of matrix.
Japan Foundry Engineering Societyの論文