摘要
为研究快速升温过程中的电热冲击对多物理场耦合烧结收缩及致密化的影响,以纯Fe粉为研究对象,利用Gleeble-1500D热模拟机,将Fe粉压坯以50℃/s的升温速度快速加热至825℃,不保温,然后冷却至400℃,随后分别以相同的升温速度和冷却速度在400～825℃的范围内共进行5次电热冲击,并与传统真空烧结法进行了烧结致密化对比。研究发现,多物理场耦合烧结时,在快速升温的电热冲击过程中压坯在较低温度时便出现急剧收缩,在825℃的最高温度下经过2 min的电热冲击循环,即得到了相对密度为97.55%的烧结体;而传统真空烧结时,在1 125℃的烧结温度保温60 min,烧结体的相对密度为85.70%。结果表明,与传统的高温长时间的烧结保温方式相比,多物理场耦合烧结的电热冲击方式是实现粉末材料快速烧结致密化的一条新途径。
In order to investigate the electro-heating impact on shrinkage and densification of multi-physics fields coupling sintering during the rapid heating process,the iron powder compact was firstly heated to 825 ℃ at the preset heating rate of 50 ℃/s,and then cooled down to 400 ℃ without heat preservation.After that,the compact was heated at the same heating rate and cooled again between 825 ℃ and 400 ℃ for 5 cycles.The whole process was carried out by Gleeble-1500D thermal simulation instrument.Further,the sample was compared with that of traditional vacuum sintering.It was demonstrated that for the multi-physics fields coupling sintering the sample appeared severe contraction at low temperature during the fast temperature rising due to the heating shock.After 2 minutes'electro-heating impact cycle,the powder compact was realized to relative density of 97.55%,compared with traditional vacuum sintering technology where the powder compact was sintered at 1 125 ℃,the holding time was 60 minutes,and the relative density was 85.70%.The results showed that the electro-heating impact of multi-physics fields coupling sintering is a new method to realize density in comparison with the long holding time traditional vacuum sintering.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2013年第S1期154-157,共4页
Journal of Sichuan University (Engineering Science Edition)
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
电热冲击
收缩
致密化
multi-physics fields coupling sintering
electro-heating impact
shrinkage
densification
