反应浓度对铝镁合金粉表面硅烷膜的形成及热性能的影响

摘要

In order to avoid the oxidation, different concentration of silane coupling agent were chosen for processing atomized Al-50Mg alloy powder. By means of thermal analysis, SEM, EDS and particle size analysis, the surface of the coated samples were analyzed. Effect of reaction concentration on the formation and thermal properties of silane film on the surface of Al-50Mg alloy powder was studied. Results show that silane coupling agent can be grafted on the surface of the Al-50Mg alloy powder through the covalent bond. The silane film has good oxidation resistance. When concentration of silane coupling agent reached 2%, melting endothermic peak, heat absorption and weighting rate of the Al-50Mg alloy powder could show optimal performance. It has more practical value than the 1% and 4% concentrations of coating.%为避免雾化铝镁合金粉氧化,用不同浓度硅烷偶联剂对其进行包覆处理,利用热分析、扫描电镜、电子能谱、粒度分析等手段,对包覆处理后的样品进行分析,研究不同反应浓度对雾化铝镁合金粉表面硅烷膜的形成及热性能的影响.结果表明,硅烷偶联剂能够通过共价键作用,接枝在雾化铝镁合金粉表面,形成的硅烷膜具有很好的防氧化特性.当反应浓度达到2%时,75 μm雾化铝镁合金粉熔融吸热峰温度和吸热量最低,增重率最大,比1%,4%浓度包覆更具有应用价值.