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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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Reactive spontaneous infiltration of Al-activated TiO_2 by molten aluminum

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Transactions of Nonferrous Metals Society of China 2019年第3期29卷 657-666页

作者： Abdollah SABOORI Xiang CHEN Claudio BADINI Paolo FINO Matteo PAVESE Department of Applied Science and Technology Politecnico di TorinoCorso Duca Degli Abruzzi 24 10129 Torino Italy Research Center of Graphene Applications Beijing Institute of Aeronautical Materials Beijing 100095 China

The reactive spontaneous infiltration of Al-activated TiO2 (anatase) was investigated. Pure Al powder was blended with TiO2 for activation. They were compacted into the preform and then sealed within 6060 alloy mould. The activation and infiltration were carried out in 6060 alloy bath for 1 h and comparative sintering experiments were carried out in an argon protected environment under the same conditions of temperature and duration. X-ray diffraction analysis proved that the Al sealed environment was superior to the argon protection on activating the reaction between Al and TiO2. The blending ratio of TiO2 to Al and the temperature were found to play the most important role in infiltration by affecting infiltration and reaction kinetics. Three main types of microstructures were observed after infiltration: full infiltration, partial infiltration with the formation of cracks and no infiltration. The formation of these microstructures was explained on the basis of reaction kinetics and local volume changes due to the reactions. Ultimately, it is found that to obtain an overall good spontaneous infiltration, a TiO2 to Al blending ratio around 3:7 in volume and an infiltration temperature around 900 °C are the most suitable.

关键词： spontaneous infiltration pressureless sintering TiO2-Al reaction infiltration kinetics in-situ fabrication

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