Microstructure and wear resistance of low temperature hot pressed TiB2 |
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Authors: | J.S. Peters B.A. Cook J.L. Harringa A.M. Russell |
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Affiliation: | 1. Department of Materials Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran;2. Department of Materials Science and Engineering, University of Tabriz, Tabriz, Iran;3. Chemistry and Chemical Engineering Research Center of Iran, Iran |
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Abstract: | Fine-grained TiB2 compacts have been hot pressed to 98–99% theoretical density at 1400 °C. The compacts were consolidated from sub-micron powders prepared by a high-energy ball milling technique. Titanium diboride (TiB2) powders were obtained from the milling of commercially synthesized TiB2 and also from the mechanical alloying (MA) of Ti and B precursors. The formation of TiB2 from Ti and B powders by mechanical alloying was found to reach completion after 3 h, and wear debris from steel mill vials and media introduced 0.8 to 1.5 wt% Fe in the sintered compacts. The dry erosion resistance of the highest density compacts was examined using an ASTM standard test with an abrasive jet of Al2O3 impinging at a normal angle of incidence. Steady-state erosion rates of 0.5 mm3/kg of erodent compare favorably with the measured value of 9 mm3/kg for commercial, fine-grained WC–Co cermets under identical conditions. Microstructures, fracture surfaces, and erosion craters were also examined by electron microscopy. |
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