Al/Mo/PMF复合粉末的制备及其热氧化和增压性能  

Preparation and Characterization of Thermal Oxidation and Pressurization of Al/Mo/PMF Composite Powder

作　　者：夏滨 蔡水洲[1] XIA Bin;CAI Shui-zhou(State Key Laboratory of Material Processing and Die&Mould Technology,The School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan,430074,China)

机构地区：[1]华中科技大学材料成型与模具技术国家重点实验室,湖北武汉430074

出　　处：《含能材料》2021年第10期920-927,共8页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金(51871106)。

摘　　要：为了获得具有燃烧增压效应的金属合金复合燃料,通过真空悬浮熔炼、超高温气雾化法、机械合金化等方法联用制备了Al/Mo/PMF(氟化石墨)复合粉末。用X射线衍射(XRD)、扫描电镜(SEM)、热重-差热分析(TG/DTA)等表征手段分析复合粉末的物相、颗粒形貌、热性能,用氧弹量热仪、定容等热燃烧实验测试复合粉末的燃烧焓及增压性能。结果表明,经机械球磨后,PMF在复合粉末颗粒中分布均匀,有助于提高粉末的热反应活性,起始反应温度前移,且由燃烧产生的低沸点AlF3、MoO3等产物造成的额外增压效应较为明显,Al/Mo/PMF 64/16/20复合粉末燃烧产生的额外增压比纯Al粉高4.49%。但随着PMF含量增加,复合粉末的燃烧焓及燃烧完全程度有所降低,Al/Mo/PMF 76/19/5复合粉末的实测燃烧焓为22541.8 J·g-1,而Al/Mo/PMF 64/16/20复合粉末的实测燃烧焓为16788.5 J·g-1。当PMF含量为5%时,既能保证复合粉末的燃烧完全,又能兼顾到气态产物的额外增压,其对应最大压力值为3.430 MPa。同时还研究了Al/Mo/PMF 76/19/5复合粉末的氧化过程及机理。In order to obtain the metal alloy composite fuel with pressurization effect,Al/Mo/PMF composite powder was prepared by a combination of vacuum suspension smelting,ultra-high temperature gas atomization and mechanical alloying. The phase,morphology and thermal properties of the composite powder were analyzed by XRD,SEM,TG/DTA. The combustion enthalpy and pressurization properties of the composite powder was measured by oxygen bomb calorimeter and constant volume isothermic combustion experiments. Results show that PMF distributes homogeneously in the composite particles after mechanical ball milling,which is helpful to improve the thermal reactivity of the powder and advance the initial reaction temperature.The extra pressurization effect was obvious due to the production of AlF3 and MoO3 with low boiling point. The extra pressurization generated by the combustion of Al/Mo/PMF 64/16/20 composite powder was 4.49% higher than that of pure Al powder.With the increase of PMF in the composite,the combustion enthalpy and combustion completeness of the composite powder decreased. The measured combustion enthalpy of Al/Mo/PMF 76/19/5 composite powder was 22541.8 J·g-1,while the measured combustion enthalpy of Al/Mo/PMF 64/16/20 composite powder was 16788.5 J·g-1. When the PMF content was 5%,the composite can burn completely,meanwhile the extra pressurization can be presented effectively. The corresponding maximum pressure was 3.430 MPa. In addition,the oxidation process and the mechanism of Al/Mo/PMF 76/19/5 composite powder were also studied.

关 键 词：Al/Mo/PMF复合粉末 氟化石墨(PMF)热性能 增压性能 氧化机理 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]