| 镍-铝粉末压坯燃烧热分析 |
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| 引用本文： | 冯广杰,李卓然,徐慨,刘羽.镍-铝粉末压坯燃烧热分析[J].焊接学报,2014,35(9):65-68. |
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| 作者姓名： | 冯广杰 李卓然 徐慨 刘羽 |
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| 作者单位： | 哈尔滨工业大学先进焊接与连接国家重点实验室, 哈尔滨 150001 |
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| 基金项目： | 国家自然科学基金资助项目(51075101) |
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| 摘 要： | 以镍-铝混合粉末压坯作为研究对象,利用差热分析(DTA)试验分析了镍-铝粉末压坯的自蔓延反应.并通过在真空炉中加热,观测镍-铝粉末压坯的燃烧状况,对燃烧产物进行X射线衍射(XRD)相组成分析.利用热量传递相关知识,进行理论公式推导分析了镍-铝粉末压坯比表面积对实际燃烧温度的影响,对比了镍-铝粉末压坯不同传热形式的影响.结果表明,镍-铝粉末压坯的自蔓延反应分为3个阶段,固相反应,共晶液相,剧烈反应;镍-铝粉末压坯比表面积的增大会提高实际燃烧温度;镍-铝粉末压坯与周围环境通过导热方式散失的热量大于热辐射方式散失的热量.
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| 关 键 词： | 粉末压坯 燃烧 热分析 |
| 收稿时间： | 2013/3/22 0:00:00 |
Thermal analysis of Ni-Al powder compact combustion behavior |
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| FENG Guangjie,LI Zhuoran,XU Kai and LIU Yu.Thermal analysis of Ni-Al powder compact combustion behavior[J].Transactions of The China Welding Institution,2014,35(9):65-68. |
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| Authors: | FENG Guangjie LI Zhuoran XU Kai and LIU Yu |
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| Affiliation: | State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | The SHS reaction of Ni-Al powder compact was analyzed by DTA test. The combustion state was observed while heating Ni-Al powder compact in a vacuum furnace. XRD analysis was conducted to determine the combustion products. Heat transfer theory was used to analyze the effect of specific surface area on the actual combustion temperature of powder compact.Theoretical formula was obtained by related derivation, and the effect of different heat transfer modes was compared. The results indicate that the SHS reaction of Ni-Al powder compact consisted of three stages: solid-phase reaction, emergence of eutectic liquid and the sharp reaction. Increasing the specific surface area of Ni-Al powder compact caused higher actual combustion temperature. The quantity of lost heat from Ni-Al powder compact to surrounding environment was larger by conduction than by radiation. |
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| Keywords: | powder compact combustion thermal analysis |
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