Al2O3微粉的表面改性及表征

以α-Al₂O₃微粉为基体,Y(NO₃)₃水溶液为包裹相,采用液相包裹法进行加钇颗粒表面改性.获得了表面均匀包裹Y₂O₃的α-Al₂O₃粉体.将此粉体与Al合金复合制备复合材料.复合材料组织更加均匀.对材料进行力学性能测试,结果表明:改性粉体对Al合金增强效果明显增加,抗拉强度提高27.2％;屈服强度提高33.1％,延伸率提高10.3％.

Surface Modification and Characterization of Al2O3 Micropowder

α-Al₂O₃ micropowder with the even coating of Y₂O₃ was obtained in such an experiment by using　α-Al₂O₃ powder as base material and Y(NO₃)₃ solution as coating phase through the liquid phase coating method. The aluminium matrix composite reinforced by α-Al₂O₃ particles modified by Y₂O₃ was fabricated. The microstructure of the composite is more even. The mechanical properties testing indicates that the strengthening effect of the modified-Al₂O₃ porticles on the Al alloy is improved obviously and the tensile strength of the composites increases by 27.2%, yield strength increases by 33.1%, and the elongation increases by 10.3%.