摘要
为深入研究激光熔覆反应合成TiCp/Al复合材料过程,数值计算该过程的温度场和流场时需将所发生的化学反应热纳入计算。因此本文采用在试样扫描过程中突然停止激光发射的办法,得到反应过程中不同阶段所形成的组织,进而判断出各阶段所发生的反应;利用差热分析法(DTA)和热力学计算法确定反应热焓值。研究表明:激光熔覆条件下Al-Ti-C粉料层中合成反应的过程为:先发生3Al+Ti→Al3Ti反应,再发生Al3Ti+C→TiC+Al反应。3Al+Ti→Al3Ti的反应热为146.63kJ/mol,Al3Ti+C→TiC+Al的反应热为38.60kJ/mol。该反应热焓值可用于温度场和流场的数值模拟计算。
In order to fully understand the mechanism of process on laser cladding synthesis of TiCp/Al, reaction enthalpies should be brought into temperature and velocity fields numerical calculation. So in this paper, the laser emission was stopped suddenly during the scanning and the constituents in the microstructure of cladding layer ahead of laser beam were detected. The kinds of reactions can be deduced from the transition of the constituents. By means of difference thermal analysis and thermodynamics calculation, the reaction enthalpies could be determined. Study shows that: under laser lading condition, the reaction 3Al+Ti-->Al3Ti occurs firstly, and then the reaction Al3Ti+C-->TiC+3Al takes place. The reaction enthalpies of 3Al+Ti-->Al3Ti and Al3Ti+C-->TiC+3Al were determined as 146.63 kJ/mol and 38.60 kJ/mol, respectively.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2004年第10期1029-1032,共4页
Rare Metal Materials and Engineering
基金
陕西省教委专项基金(AJ04020)
西安市科委工业攻关基金(GG04062)
西安建筑科技大学博士基金资助项目
关键词
激光熔覆
差热分析
热力学计算
化学反应
反应热焓
laser cladding
difference thermal analysis
thermodynamics calculation
chemical reactions
reaction enthalpies
