Critical Condition for Molten Al Infiltration in Centrifugal Force Field

• 1、School of Mechanical and Power Energy Eng.,Shanghai Jiaotong University
• 2、School of Mechanical and Power Energy Eng.-Shanghai Jiaotong University
• 3、shanghai MT environment and energy save company

Abstract：In this paper, the influence of the mass of Al, the porous of preform and the rotational frequency of model on infiltration pressure is analyzed for the infiltration of molten Al in Al2O3 fibrous preforn of long column under centrifugal force field. The minimum rotational frequency, mass of Al and porosity for the critical infiltration and their mutual influence rule are obtained under different conditions. The result show that the occurrence of infiltration is determined by the mass of Al, the rotational frequency and the porosity of perform at certain temperature. If the minimum infiltration condition for the initial infiltration on the entrance is satisfied, the infiltration process will begin and maintain as the main power for centrifugal infiltration increases with the infiltration. There are three distinctly stages of infiltration velocity, the onset stage of infiltration, which drops down sharply, and the following stage of smooth velocity; When all molten Al is infiltrated into the perform, the infiltration velocity will increases again.

Keywords： centrifugal infiltration critical infiltration condition porous perform front interface