摘要
为研究多物理场耦合烧结法的低温快速致密化烧结机制及其动力学,以纯铁粉为研究对象,采用Gleeble-1500D热模拟机和真空烧结炉,对纯铁粉压坯分别进行了多物理场耦合烧结和传统真空烧结,并对两种烧结方式下的烧结机制及烧结活化能进行了对比研究。结果表明,传统真空烧结时的烧结机制以体积扩散为主,多物理场耦合烧结时其低温阶段以体积扩散为主,而高温阶段是体积扩散和蒸发凝聚的综合作用;传统真空烧结的烧结活化能为80.435 kJ/mol,而多物理场耦合烧结时的烧结活化能为23.551 kJ/mol。结果表明,电场对粉末材料的低温烧结快速致密化具有重要的促进作用。
In order to study densification mechanism and dynamics of multi-physics fields coupling during sintering process of rapid low temperature sintering, the experiments were carried out by a Gleeble-1500D thermal simulation instrument and vacuum sintering furnace, where pure iron powders were sintered by traditional vacuum sintering and multi-physics fields coupling sintering, and then sintering mechanism and sintering activation energy of the two methods were studied respectively. The results show that the mechanism of the traditional vacuum sintering is mainly volume diffusion, while that of multi-physics fields coupling sintering in the low temperature sintering stage is mainly volume diffusion, and in high temperature stage is the volume diffusion and evaporation condensation of comprehensive effect. The sintering activation energy of the traditional vacuum sintering is 80. 435 kJ/mol, while that of multi-physics fields coupling sintering is 23. 551 kJ/mol. The results show that the electric field plays an important role on promoting rapid densification of oowder material sintering in low temperature stage.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第2期24-28,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金资助项目(51275322)
关键词
多物理场耦合烧结
烧结机制
动力学
活化能
multi-physics fields coupling sintering
sintering mechanism
dynamics
activation energy
