(1. 蘭州理工大學(xué) 甘肅省有色金屬新材料省部共建國家重點(diǎn)實(shí)驗(yàn)室, 蘭州 730050;
2. 蘭州理工大學(xué) 有色金屬合金省部共建教育部重點(diǎn)實(shí)驗(yàn)室,
蘭州 730050)
摘 要: 采用自蔓延燃燒模式及熱爆燃燒模式合成較純的Mg2Ni金屬間化合物。通過對(duì)不同預(yù)熱溫度下熱爆反應(yīng)過程的研究, 證實(shí)在較低溫度下, Mg-Ni體系存在固-固反應(yīng), 且反應(yīng)的程度隨預(yù)熱速度的降低而增大。由于Mg-Ni體系為弱放熱體系, 因此燃燒過程為不完全燃燒。采用試樣頂部添加引燃劑（Al-Ti-C）的方法，成功淬熄了Mg-Ni反應(yīng)。對(duì)不同區(qū)域進(jìn)行的SEM、EDS和XRD分析表明反應(yīng)直接生成了Mg2Ni而沒有中間相。
關(guān)鍵字: 燃燒合成；Mg基；淬熄；反應(yīng)模式
mechanism of combustion synthesis of Mg2Ni
（1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,
Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys,
Ministry of Education, Lanzhou University of Technology,
Lanzhou 730050, China）
Abstract: The pure Mg2Ni intermetallic was synthesized by self-propagating combustion mode, and thermal explosion mode, respectively. And the reaction process of thermal explosion was researched under different preheat temperatures. The results show that solid combustion exists at lower temperatures, and the reaction extent increases with decreasing preheat rate. Further more, the synthesis is incomplete for the weak exothermal system. A further experiment of combustion front quenching (CFQ) was brought to success in cylindrical steel die by adding some Al-Ti-C powder that was accepted high exothermic system on the top of Mg-Ni specimen. The phase structure changes of all region in the quenched sample during the combustion synthesis were observed by scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffractometry. The results show that the synthesis of Mg2Ni is direct rather than through other intermediates.
Key words: combustion synthesis; Mg-based; combustion front quenching method; reaction mode
