重力对GaSb熔滴和液/固界面交互作用的影响

EFFECT OF GRAVITY ON THE WETTING BEHAVIOR OF MOLTEN GaSb DROP

利用我国返回式实验卫星在空间微重力条件下进行了GaSb熔滴与GaP ,BN和GaAs等材料的润湿性能的研究 ,分析了熔滴与基片之间的界面相互作用 ,并与重力场下实验结果进行了对比 .实验表明 ,重力因素对润湿性存在影响 ,空间微重力条件下测得的GaSb熔滴与GaP及BN基片的接触角比地面测量的大 .对凝固后的熔滴与基片之间的组织分析显示 ,重力场下 ,液固界面的相互作用较强 ,存在较宽的过渡区 ,这与地面浮力对流有利于物质输运密切相关 .实验结果还表明 ,空间微重力环境下熔体凝固的组织比重力场下要均匀 .

The wetting behavior of molten GaSb drops on the substrates of GaP,BN or GaAs in space has been investigated using Chinese recovered satellite.The interaction at the interface of the molten drop and the substrate has been analyzed and compared with the results on the earth.The experiment results show that the gravity has an effect on the wetting behavior of GaSb molten drop.The contact angle of GaSb drop with GaP and BN substrates in space is larger than that on the earth.The morphology of the interface between the concreted drop and the substrate indicates that on the earth the interaction at the liquid/solid interface is strong and a wider transition region exists.It is concerned that the gravity convection is of benefit to the transfer of matters.The experiment results also show that the morphology of the samples concreted in space is more uniform than that on the earth.