Surface Modification of Diamonds in Diamond/Al-Matrix Composite

C. Edtmaier; Ludger Weber; Reza Tavangar

doi:10.4028/www.scientific.net/AMR.59.125

Paper Titles

Improved Mechanical Properties of Ti₂AlNb-Based Intermetallic Alloys and Composites
p.105

Diamond-Based Metal Matrix Composites for Thermal Management Made by Liquid Metal Infiltration — Potential and Limits
p.111

Comparative Study of Predictive Finite Element Methods for Mechanical Properties in 2D Woven Carbon/Carbon Composites
p.116

Heat Sink Materials Processing by Pulse Plasma Sintering
p.120

Surface Modification of Diamonds in Diamond/Al-Matrix Composite
p.125

Carbon Nanotubes as Highly Conductive Nano-Fillers in Metallic Matrices
p.131

Influence of Different Deposition Parameters on the Performance of a Ti-Ta-C Interface Layer in SiC-Fiber Reinforced Copper Matrix Composites
p.138

Diamond Composites for Power Electronics Application
p.143

Effect of Fibre Anisotropy on Composite Thermal Conductivity
p.148

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 59Surface Modification of Diamonds in...

Surface Modification of Diamonds in Diamond/Al-Matrix Composite

Abstract:

Fe- or Mn-powders were mixed with the diamonds and the mixtures were heat treated under different gas atmospheres like hydrogen or argon gas and at varying temperatures in order to roughen the surface of the diamond particles. Subsequently the reaction layers are removed by the addition of aqueous solutions of HCl. The modified surface structure after the etching process is investigated by electron microscopy showing increased roughening of the formerly flat faces of the diamond particles with increasing heat treatment temperature. After drying the diamonds, composites were prepared by gas pressure infiltration with pure Al. For treatments in the temperature range from 750 to 850°C the thermal conductivity can be improved by up to 20 percent compared to composites based on un-treated powders.