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INFILTRATION KINETICS MODEL OF LIQUID METAL INTO A FIBROUS PREFORM IN centrifugal accelerating field

Chinese Journal of Mechanical Engineering 2001年第4期14卷 293-296页

作者： Zhang Xinping,Yu Sirong,He Zhenming (College of Materials Science and Engineering,Jilin University) 吉林大学吉林

The infiltration kinetics of the metal melt into a fibrous preform in centrifugal accelerating field is analyzed on the basis of Darcy's law and the assumption that the fibrous preform is treated as 'bundle of capillaries' The critical rotating speed is analyzed with the established model The influences of the metal melt mass,the rotating speed of the equipment,the casting height, the original outer radius of the metal melt and the fibrous volume fraction in fibrous preform on infilatration are studied The results show that the critical rotating speed is dependent on critical pressure, casting height, metal melt mass and the character of fibrous preform With the increase in the metal melt mass, rotating speed of the equipment and original outer radius of the metal melt, or the decrease in casting height and fibrous volume fraction in fibrous of the metal melt,or the decrease in casting height and fibrous volume fraction in fibrous preform,infiltration of metal melt for fibrous preform becomes easier.

关键词： centrifugal accelerating field Metal melt Fiber Infiltration kinetics Metal matrix composite

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PARTICLE DISTRIBUTION IN centrifugal accelerating fieldS

引用

Chinese Journal of Mechanical Engineering 2003年第3期16卷 329-333页

作者： Yu SirongZhang XinpingHe ZhenmingLiu YaohuiCollege of Materials Scienceand Engineering,Jilin University,Changchun 130025, China College of Materials Science and Engineering Jilin University Changchun 130025

Based on continuum theory and moving law of particles, a model is presentedto obtain gradient distribution of particles in centrifugal accelerating field, by which theparticle distribution in gradient composite material can be predicted. The simulation shows withincreases in rotating time, four regions gradually appear from the internal periphery to theexternal one, they are free region, transition region, steady region and surface reinforced region,and the latest three regions are defined as a rich region. Finally, the steady region disappears,and the rich region only includes transition region and surface reinforced region. The influences ofcentrifugal acceleration coefficient G, primary volume fraction phi_0, pouring temperature theta_pand density difference between the particle and the metal matrix on particles gradient distributionare studied in detail. The results of the theoretical analysis agree with experiment ones. Both ofanalysis and experiment results indicate that with the increase in G and theta_p the particledistribution becomes more centralized and the consistence of particle in the surface peripherybecomes larger.

关键词： centrifugal accelerating field Particles Numerical simulation Functionalgradient material

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