Effects of jet milling on W–10 wt.%Cu composite powder for injection molding

Journal of Materials Research and Technology

Xingjun Liu¹  Qian Zhang¹  Huayu Zhang²  Longshan Xu²  Cuiping Wang³  Mingliang Ouyang³  Chenglei Wang⁴ 

[1] Big Data, Harbin Institute of Technology, 518055, Shenzhen, PR China;;Institute of Materials Genome &School of Materials Science and Engineering, Harbin Institute of Technology, 518055, Shenzhen, PR China;School of Materials Science and Engineering, Xiamen University of Technology, 361024, Xiamen, PR China;

关键词: Composite powders;    Tungsten–copper;    Powder injection molding;    Jet milling;   

DOI  :  

来源: DOAJ

【 摘 要 】

Ultrafine W–10 wt.%Cu powders synthesized by thermo-chemical method have a good sinterability compared with the mechanically mixed powers, which are suitable for powder injection molding (PIM). The deagglomeration, however, is necessary to improve the flowability of the ultrafine powder to obtain a PIM feedstock with high powder loading. Jet milling (JM) was employed in this study to reduce the strong agglomerations among the particles, which were subsequently used for PIM. Results showed that JM was a proper process to modify the ultrafine powders for mass production with negligible contamination. JM modified the powder characteristics, including agglomeration, size distribution, surface morphology, and tap density, which considerably improved the rheological properties of feedstock. With the increasing of powder fraction in the feedstock from 46 vol.% to 52 vol.%, the shrinkage of the parts during sintering reduced accordingly, which is favorable for dimensional stability. The resulted W–10 wt.%Cu sintered composite has excellent physical properties, such as high thermal and electric conductivity, as well as low coefficient of thermal expansion, which can be attributed to its near full density and homogeneous microstructure.

【 授权许可】

Unknown