yThe wetting behavior of molten GaSb drops on the substrates of GaP,BN or G
aAs in space has been investigated using Chinese recovered satellite. The i
nteraction at the interface of the molten drop and the substrate has been a
nalyzed 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 interacti
on at the liquid/solid interface is strong and a wider transition region ex
ists. It is concerned that the gravity convection is of benefit to the tran
sfer of matters. The experiment results also show that the morphology of th
e samples concreted in space is more uniform than that on the earth.