摘要
利用燃烧合成技术在制备多孔材料方面有其独特的优势,基于Al-Ti-B4C-TiH2系燃烧合成反应制备泡沫铝。通过燃烧过程中的反应放热量、燃烧温度、原料配比临界条件的理论计算及DSC曲线分析对Al-Ti-B4C-TiH2系燃烧合成反应进行热力学研究。实验结果表明:Al-Ti间、Ti-B4C间反应分别在800℃及1 300℃左右发生,首先Al-Ti间反应,随着反应放热量的增加TiB4C间反应被激活,大量剩余的Ti优先与B4C反应直至无B4C存在,剩余的Ti再与Al反应,AlTi间反应的最终产物应为TiAl3。原料中的TiH2受热分解释放出气体迫使预制体膨胀得到泡沫铝。原料配比的临界条件中Al的质量分数为76%,且生成物中Al相质量分数为68.8%。
Combustion Synthesis （CS） has its unique advantages in the preparation of porous materials. In this paper, the aluminum foam was produced by Al-Ti-B4C-TiH2 reaction. The thermodynamics of Al-Ti-B4C-TiH2 reaction was researched by the theoretical calculations of combustion temperature, critical condition and released heat. DSC curve analysis results show that the reaction temperature between Al-Ti and Ti-B4C was 800℃ and 1 300℃, respectively. Al and Ti reacted firstly, then the reaction heat caused the reaction of Ti and B4 C. The residual Ti reacted with Al to form TiAl3. The powder of TiH2 was heated to release gas to make the precursor expansion. The mass fraction of aluminum in the raw material ratio and combustion products reached to 76% and 68.8% ,respectively.
出处
《太原理工大学学报》
CAS
北大核心
2014年第1期37-41,共5页
Journal of Taiyuan University of Technology
关键词
泡沫铝
燃烧合成反应
反应热
燃烧温度
aluminum foam
combustion synthesis reaction
heat of reaction
ignition tempera ture
