用ＳＥＭ，ＸＲＤ和ＴＥＭ研究ＳｉＣｗ／ＬＤ２复合材料干滑动摩擦磨损规律及组织结构的变化，结果表明：随正向载荷和滑动速度增加．材料表面发生从轻微磨损（轻微氧化磨损和高温氧化磨损）向严重磨损（磨粒磨损和粘着脱层）直至咬合的转化．试样表层出现沿滑动方向的塑性流变，ＳｉＣｗ沿滑动方向重新排列，表面层形成β－Ａｌ２Ｏ３，亚表层晶块及晶须破碎，裂纹在界面处形成并向基体扩展． SEM, XRD and TEM studies of SiCw / LD2 composite dry sliding friction and wear law and organizational changes, the results show that: with the forward load and sliding speed increases. The material surface occurs from slight wear (slight oxidative wear and high temperature oxidative wear) to severe wear (abrasive wear and adhesive delamination) until occlusion. The sample surface appears plastic flow along the sliding direction, and SiCw rearranges along the sliding direction. The surface layer forms β-Al2O3, the sub-surface crystal grains and the whisker are broken, and cracks form at the interface and expand to the matrix.