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Effect of particle size and sintering temperature on densification during coupled multifield-activated microforming

Published online by Cambridge University Press:  24 August 2012

Dong Lu ,
Yi Yang ,
Yi Qin  and
Gang Yang
Dong Lu
Affiliation:
School of Manufacturing Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China
Yi Yang*
Affiliation:
School of Manufacturing Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China
Yi Qin
Affiliation:
Department of Design, Manufacture and Engineering Management, Manufacturing Engineering Research Centre, The University of Strathclyde, Glasgow, G1 1XJ, United Kingdom
Gang Yang
Affiliation:
School of Manufacturing Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this paper, a novel sintering method is introduced for the forming of microcomponents in which the loose powders were loaded directly into the die, sintered with an external electric field, a thermal field, and an external stress field (called coupled multifields activation), where the fields were generated by a Gleeble thermal simulation instrument. Two kinds of 316L stainless steel powders of different particle sizes (20 and 70 μm) with no binder were sintered with microforming using a multifield coupling method. For particle size of 20 μm, a nearly fully densified microsintered compact (relative density is 99.2%) was manufactured at a relatively low sintering temperature (900 °C) and within a relatively short sintering time (4 min). The fluctuated temperature–time curve reveals that the rapid mass transfer of liquid phase is the dominant densification mechanism in the compacts with a starting particle size of 20 μm.

Keywords

steelsinteringdensification
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 20 , 28 October 2012 , pp. 2579 - 2586
Copyright
Copyright © Materials Research Society 2012

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