Paper Titles
Sinetring of Cobalt - (3-25 wt.%) Iron Materials
p.1129
The In-Situ Dressing of CMP Pad Conditioners with Novel Coating Protection
p.1133
The Metallization of Diamond Grits
p.1137
The Revolution of Diamond Synthesis Technology
p.1141
Thermal Protection Shield Concept for Diamond Impregnated Tools
p.1145
A Study of Reduced and Carburized Reactions in Dry-Milled WO3+Co3O4+C Mixed Powders with Different Carbon Content
p.1149
Binder-Free Tungsten Carbide Fabricated by Pulsed Electric Current Sintering
p.1153
Development of High Corrosion Resistant Mo2NiB2 Boride Base Cermets for Plastic Injection Molding Machine Parts
p.1157
Effect of Adding a Type of Binder Phase on The Microstructure, Properties and Heat Treatment of Steel Bonded TiC Cermets
p.1161

Thermal Protection Shield Concept for Diamond Impregnated Tools

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Abstract:

Due to their better mechanical and physical properties diamond tools have largely replaced cemented carbide tools for machining of mineral materials like concrete and rocks. The decomposition tendency of diamond has to be taken into consideration during the manufacturing process as well as during their employment in machining tools. By using water cooling the diamond decomposition is reduced, but the contamination of occupied buildings by concrete/rock-watermixture and the need of water supply units on building sites are unfavourable. However, absence of water cooling lead to an increased tribological and thermal wear of conventional diamond tools. Due to the heat development the diamonds in direct contact with mineral materials as well as the diamonds in deeper layers are deteriorated. The Institute of Materials Engineering pursues a novel thermal protection shield concept, in which thermal insulating materials such as Al2O3, ZrO2 or glass in diamond impregnated composite structures act as heat shield, which protects diamonds in deeper layers against high temperature and graphitisation. Before the effectiveness of this concept could be investigated suitable composites have to be manufactured. In this paper the powder metallurgical production processes of diamondalumina- cobalt-composites with varying alumina and cobalt particle sizes, their microstructures and porosities are described. In comparison to composites with larger alumina particle sizes it could be observed that the distribution of alumina particles with particle sizes below 70 ,m in the cobalt matrix is uniform and the porosity of the composite decrease.

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Periodical:

Materials Science Forum (Volumes 534-536)

Pages:

1145-1148

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.534-536.1145

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Online since:

January 2007

Authors:

Wolfgang Tillmann, Miriam Gathen, Christian Kronholz

Keywords:

Aluminum (Al), Bronze, Cobalt, Diamond, Diamond Impregnated Tool, Glass, Heat Shield Concept, Hot Isostatic Pressing (HIP), Pressureless Sintering, Thermal Protection

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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