Flow rate of metal powders at reduced and elevated air pressure
Yang, Shoufeng and Evans, Julian R.G. (2005) Flow rate of metal powders at reduced and elevated air pressure. Powder Technology, 154, (2-3), 95-98. (doi:10.1016/j.powtec.2005.04.038).
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Description/Abstract
There are suggestions that the flow rate of dry powder is affected by ambient gas pressure as distinct from pressure differential. This raises the concern that computer controlled powder deposition methods for selective laser sintering in which powder mixtures are delivered to the building platform by acoustic control of flow in capillaries may be affected by partial vacuum applied to reduce oxidation. The flow rate of free flowing powders in the static Hall flow meter was measured at reduced and elevated air pressure. There was no systematic difference in the Hall flow times for these powders over 8 orders of magnitude of pressure in the range from 2.0 × 105 Pa down to 8.1 × 10− 4 Pa. Copper powder as well as a tool steel was investigated because of the suggestion that flow reduction could be due to welding of asperities but flow rate reduction was not observed at reduced pressure down to 10− 4 Pa.
| Item Type: | Article |
|---|---|
| Additional Information: | Short communication |
| ISSNs: | 0032-5910 (print) 1873-328X (electronic) |
| Keywords: | powder flow, vacuum, pressure, selective laser sintering |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering |
| Item ID: | 165077 |
| Date Deposited: | 07 Oct 2010 13:59 |
| Last Modified: | 01 Jun 2011 17:44 |
| Contributors: | Yang, Shoufeng (Author) Evans, Julian R.G. (Author) |
| Date: | 6 July 2005 |
| Additional Information: | Short communication |
| Status: | Published |
| Publisher: | ELSEVIER SCIENCE SA |
| URI: | http://eprints.soton.ac.uk/id/eprint/165077 |
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