目的 提高铝镁合金粉防氧化性能，对其在含能材料中的应用进行探索。方法 选用硅烷偶联剂KH845-4对30 μm雾化球形铝镁合金粉进行表面改性，选择反应温度、反应时间、反应浓度作为正交实验因素，通过热分析测试数据对表面改性效果进行评价。以电子能谱、扫描电镜、粒度分析等手段对表面改性前后的铝镁合金粉氧元素含量、形貌和粒度进行分析。结果 经硅烷偶联剂处理后，铝镁合金粉的熔融吸热起始温度和氧化放热起始温度都有所升高，但升高幅度有限。反应温度、反应时间、反应浓度对防氧化性能均有影响。反应浓度对正交实验评价指标的影响最大，反应温度的影响最小。硅烷膜层仅隔离了活性铝镁合金粉与空气之间的接触，不会改变铝镁合金粉的晶体结构。结论 硅烷偶联剂能够明显提高铝镁合金粉的防氧化性。表面改性最优工艺参数组合为：反应温度40 ℃，反应时间1.5 h，反应浓度4%（质量分数）。

The work aims to improve the antioxidation property of Al-Mg alloy powder and explore the application in energetic materials. Silane coupling agent (SCA) KH845-4 was chosen for surface modification of 30 μm atomized spherical Al-Mg alloy powder. Reaction temperature, reaction time, reaction concentration were chosen as the influence factors of the orthogonal experiment. The effect of surface modification was evaluated by thermal analysis test data. The oxygen content, morphology and particle size of Al-Mg alloy powder were analyzed by EDS, SEM and particle size analysis before and after the surface modification. After being treated by SCA, both onset temperature of the melting heat absorption and oxidative heat release of Al-Mg alloy powder increased, but the increasing range was limited. Antioxidation properties were affected by reaction temperature, reaction time and reaction concentration. The effect of reaction concentration on evaluation index of orthogonal experiment was the most significant and the effect of reaction temperature was the least. The silane film only isolated the contact between the active Al-Mg alloy powder and air. The crystal structure of Al-Mg alloy powder was not changed. SCA can effectively improve oxidation resistance of Al-Mg alloy powder. The best process scheme of surface modification is: reaction temperature at 40 ℃, reaction time at 1.5 hours and reaction concentration at 40%.