Abstract: Testing methods including SEM, FT-IR and XRD were adopted to analyze the surface topography, surface groups and phase composition of the hemihydrate calcium sulfate whiskers before and after the stabilization treatment.On this basis, the stabilization mechanism of hemihydrate calcium sulfate whisker by sodium oleate was studied.The results indicate that the adsorption state of sodium oleate on the surface of hemihydrate calcium sulfate whiskers varies with its dosage.The radical causes for sodium oleate to stabilize hemihydrate calcium sulfate whiskers are its closure of the calcium ions at whisker surface active sites, its prohibition of the dissolution of whisker surface ions and its change of the whisker surface property.

Key words: Hemihydrate calcium sulfate whiskers, Sodium oleate, Stabilization mechanism