Process analysis of binder treatment on iron-based alloy powder. (20th October 2017)

• Record Type: Journal Article
• Authors: Zhang, Wang; Wang, Linshan; Wang, Rui; Liang, Xuebing; Zhang, Lin; Wang, Limin; Zhang, Shaoming
• Is Part Of: Powder metallurgy. Volume 60:Number 5(2017)
• Page Start: 330
• Page End: 336
• Publication Date: 2017-10-20
• Subjects: Powder metallurgy -- binder treatment -- bonding behaviour -- binder liquid -- fine powder -- irregular coarse particle; Powder metallurgy -- Periodicals; 671.3705
• DOI: 10.1080/00325899.2017.1327637
• Languages: English
• ISSNs: 0032-5899

Abstract

ABSTRACT: Binder treatment technology is a widely used method of bonding fine powders to coarse particles using a binder liquid. In this paper, binder treatment experiments were carried out for binary Fe–C mixture and multicomponent mixture (alloy powders exceeding 15 wt.%). The differences of particle size distribution and microstructural of conventional mixing and binder treatment mixing in Fe–C mixture were compared, and the fine particles were evenly bonded to the coarse iron particles surface and preferentially filled into the pits after binder treatment. The physical properties of the multicomponent mixture after binder treatment were improved, the flowrate and fine particles adhesion ratio achieved 30 s/50 g and 96%, respectively, and the segregation was obviously reduced. Further, the phenomenon of small particles bonded to large particles was explained by capillary force and snowball effect. Meanwhile, the theory that small particles migration caused by spontaneous capillary flow during drying and consolidation was proposed.