Hard Metal Matrix Composites Reinforced with Cubic Boron Nitride

Guerold Sergueevitch Bobrovinitchii; Ana Lúcia Diegues Skury; Sérgio Neves Monteiro; Marcia G. de Azevedo

doi:10.4028/www.scientific.net/MSF.727-728.310

Paper Titles

Physicochemical Analysis of Ti-Si-B Powder Alloys
p.287

Mechanical Properties of Composite AA2024 Matrix with Aluminium Carbide Dispersed by High Energy Milling
p.293

Titanium Metal Matrix Composite Laser Coatings Based on Carbides
p.299

Obtention and Characaterization of the Sn-Ni-Fe-Cu Alloys Applied in Diamond Saw Blade Production
p.305

Hard Metal Matrix Composites Reinforced with Cubic Boron Nitride
p.310

Mechanical and Structural Characterization of Cu-Ni-Ag/Y₂O₃ Composites Obtained by Powder Metallurgy
p.314

Metal Matrix Composites from Powder Mixtures of Copper, Tungsten, Aluminum and Nanodiamonds
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Effect of the Milling Time and Addition of a Grinding Agent of Quasicrystalline Powder Based on AlCuFeB Alloys
p.324

Study of Oxidation on Pr-Fe-Co-B Nanopowders Produced by HDDR and Mechanical Milling
p.329

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Hard Metal Matrix Composites Reinforced with Cubic Boron Nitride

Abstract:

Cubic boron nitride (cBN) composites with hardmetal such as metal turning and rocks drilling, WC-Co, matrix are alternative substitutes for similar diamond composites in high speed machining operations and rocks and drilling. Although it possesses related technical properties close to diamond, cBN has the inconvenience of reacting with hardmetals. This deteriorates the composite properties. A possible solution to this negative effect is to apply high pressures during the sintering operation. In this work, powder mixtures of cBN with a hardmetal (WC15%Co) were subjected to pressures up to 7.0GPa and temperatures up to 1400°C for 40 seconds. The results showed significantly higher values of hardness and compressive strength as well as an improved wear resistance.