论文部分内容阅读
分别对Al-TiO_2体系、Al-V_2O_5体系、Al-V_2O_5-TiO_2体系以及Al-V_2O_5-TiO_2-CaO体系单位质量反应热(q,J/g)进行了计算.考察了单位质量反应热对实验结果的影响.利用XRD物相分析仪、SEM扫描电镜以及ICP对合金进行了系统的分析.结果表明:Al-V_2O_5-TiO_2-CaO体系的单位质量反应热小于2 700 J/g,发热量不足,反应不能靠自热进行,需要对体系进行补充热量才能保证自蔓延反应顺利进行;CaO的加入会降低体系的单位质量反应热.合金的主要物相为Ti、Al金属间化合物、Al_2O_3及硅铁化合物.合金微观组织结构为基体相、板条状β相以及不规则的Al_2O_3夹杂相,单位质量反应热对合金中含硅相的尺寸及分布有较大影响.随着单位质量反应热的增加,合金中Ti的含量呈下降趋势,合金中的铝呈上升趋势,V、Fe、Si元素含量(质量分数/%)随单位质量反应热的增加基本保持不变.制备合金中Al的质量分数最低为9.35%,Fe最低为2.17%,Si最低为0.78%,V最高含量为4.30%.
The heat of mass reaction (q, J / g) per unit mass of Al-TiO 2 system, Al-V 2 O 5 system, Al-V 2 O 5 -TiO 2 system and Al-V 2 O 5 -TiO 2 -CaO system were calculated respectively. The results were analyzed systematically by means of XRD, SEM and ICP.The results show that the heat of mass per unit mass of Al-V 2 O 5 -TiO 2 -CaO system is less than 2 700 J / g, , The reaction can not be carried out by self-heating, and the system needs to be supplemented with heat to ensure the smooth progress of self-propagating reaction. The addition of CaO will reduce the heat of reaction per unit mass of the system.The main phases of the alloy are Ti, Al intermetallic compounds, Al 2 O 3 and silicon The microstructure of the alloy is mainly composed of matrix phase, lath-shaped β phase and irregular Al 2 O 3 phase, and the heat of mass reaction has a great effect on the size and distribution of the silicon-containing phase in the alloy.With the mass reaction heat , The content of Ti in the alloy decreases and the content of aluminum in the alloy increases, while the content of V, Fe and Si (mass fraction /%) remains unchanged with the increase of heat of reaction per unit mass of Al in the alloy Most scores 9.35%, the lowest of Fe 2.17%, Si minimum 0.78%, V content is 4.30% maximum.