Peculiarities of vacuum annealing of nanocrystalline WC powders |
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| Affiliation: | 1. Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada;2. Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada;3. Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada |
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| Abstract: | The effect of vacuum annealing temperature on the phase and chemical composition, particle size, and microstrains of nanocrystalline powders of tungsten carbide WC with particles from 20 to 60 nm in size has been studied using X-ray diffraction and electron microscopy methods. It is established that nanocrystalline WC powders stored in air, contain from 1 to 2 wt.% of impurity oxygen. It is found that vacuum annealing of WC nanopowders at a temperature up to 1400 °C is accompanied by appreciable decarburization and variation in the phase composition due to carbon desorption as a result of interaction with impurity oxygen. Annealing leads to coarsening of powder particles caused by intergrowth of aggregated nanoparticles and to decreasing microstrains. |
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