多场耦合下的粉末成形固结理论及关键技术  

Theory and Key Technology of Powder Forming and Consolidation in Multiple Coupled Fields

作　　者：李元元[1] 李小强[1] 

机构地区：[1]华南理工大学机械工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2007年第10期14-19,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家杰出青年科学基金资助项目(50325516);广东省自然科学基金资助项目(05300305)

摘　　要：为了探索高致密、高性能、高精度、短流程和低成本的粉末成形固结技术,分别对温度场与应力场和电磁场、温度场与应力场等不同场耦合下的粉末成形固结理论及关键技术进行了研究.利用研制出的侧压力直接动态测量装置,揭示了温度场与应力场耦合作用下的铁基粉末致密化机理,并在此基础上,实现了对温度场与应力场耦合下的粉末成形过程的数值模拟,确立了温度场与应力场耦合下铁基粉末的成形固结工艺.同时,研制出了一套电场、磁场、温度场与应力场多场耦合的粉末成形固结设备,确立了铁基、WC基等粉末在多场耦合作用下的成形与烧结工艺,揭示了多场耦合成形的烧结机理,实现了对电磁场、应力场耦合下的温度场的数值模拟.In order to implement the powder forming and consolidation with high densification, good property, high precision, short time and low cost, the theory and key technology of powder forming and consolidation are presented with regard to the coupling of the temperature and stress fields and the coupling of the electromagnetic field, the temperature field and the stress field. By using the newly-developed device for the direct measurement of dynamic lateral pressure during powder compacting process, the densification mechanism of Fe-based powders in the coupled temperature and stress fields is obtained. Then, a numerical simulation of powder densification in the coupled temperature and stress fields is carried out, and the forming and consolidation process of Fe-based powders is determined and optimized. Furthermore, an apparatus for the forming and consolidation in the coupled electric, magnetic, temperature and stress fields is successfully developed, which is then used to determine the forming and sintering processes of Fe-based and WC-based powders under multi-field coupling, reveal the corresponding mechanism, and simulate the temperature distribution in the coupled electromagnetic and stress fields.

关 键 词：粉末成形固结 温度场 应力场 电磁场 场耦合 

分 类 号：TF124[冶金工程—粉末冶金]