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Rapid discharge sintering of nickel-diamond metal matrix composites
Date Issued
July 2011
Date Available
24T11:50:16Z January 2014
Abstract
In this study rapid discharge sintering (RDS) and furnace sintering of nickel–diamond metal matrix composites (MMCs) is compared. Nickel–diamond powder composites (80–20% by weight respectively) were uniaxially pressed into 20 mm discs at compaction pressures of 100, 200 and 300 MPa. Discharge sintering was carried out using a microwave plasma formed with hydrogen and hydrogen/nitrogen as the discharge gases and tube furnace sintering carried out in a argon or a hydrogen/nitrogen (3:1) atmosphere. Discs pressed to 300 MPa were treated at both 850 and 1000 °C. The properties of the sintered nickel–diamond composites were characterized using density, approximate flexural strength, hardness, wear resistance, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The RDS samples sintered at 1000 °C achieved the maximum approximate disc flexural strength of 473 MPa within a 20 min treatment time compared with 6 h for furnace sintered samples. Samples sintered using the RDS technique exhibited increased hardness values and a finer nickel matrix over furnace sintered samples. Using the RDS technique it has been possible to process nickel–diamond MMCs without oxidation or graphitisation at temperatures above 900 °C. Minimal diamond destruction was observed during abrasive wear testing of the RDS samples compared with damage and pull-out observed for furnace sintering.
Type of Material
Journal Article
Publisher
Elsevier
Journal
Journal of Materials Processing Technology
Volume
211
Issue
7
Start Page
1210
End Page
1216
Copyright (Published Version)
2011 Elsevier
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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Rapid_discharge_sintering_of_nickel-diamond_metal_matrix_composites.pdf
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1.17 MB
Format
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18
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