反応溶浸による高体積率の粒子複合アルミニウム鋳物 Aluminum Castings with High Particle Volume Fraction by Reactive Infiltration
Reactive infiltration process which thermit type reaction takes place during infiltration, was investigated to form a hard particle rich layer on aluminum alloy castings. Pure aluminum powder and SiO<sub>2</sub> particles were mixed and compacted. Then Al-Si alloy was poured into a mold containing the compact, and isothermally held at fixed temperature for a certain time. Consequently, the microstructure of product Al<sub>2</sub>O<sub>3</sub> particle formed by the reduction of SiO<sub>2</sub> is varied with holding temperature. The fine Al<sub>2</sub>O<sub>3</sub> particles come into prominence with rising temperature. Even at 1273K, the long period of holding time is required to attain the finer Al<sub>2</sub>O<sub>3</sub> particles dispersed in matrix. Although the porosity of the compact before reactive infiltration was about 30 %, it reduces with increasing temperature and holding time. At 1273K for 3.6 ks holding, a specimen shows the porosity of 6.2 %.
- 鋳造工学 = Journal of Japan Foundry Engineering Society
鋳造工学 = Journal of Japan Foundry Engineering Society 70(3), 175-179, 1998-03