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- Title
Mo-Cu pseudoalloys by combustion synthesis and spark plasma sintering.
- Authors
Minasyan, T.; Kirakosyan, H.; Aydinyan, S.; Liu, L.; Kharatyan, S.; Hussainova, I.
- Abstract
The in situ preparation of Mo-Cu from copper molybdate in the combustion mode with the help of thermo-kinetic coupling approach using the combined magnesium/carbon reducer to provide controllable thermal conditions is reported. To determine the optimum processing parameters, the stepwise nature of reaction mechanism in the CuMoO4-Mg-C system was comprehensively explored with the help of a copper wedge quenching technique combined with X-ray diffraction and microstructural analysis of intermediate and final products. Precursor compositions of CuMoO4(I)-1.2 Mg-2.2C and CuMoO4(II)-1.5 Mg-1.6C reduced at 3 MPa pressure in a temperature range of 1350-1450 °C were found to be the optimal conditions for the combustion formation of Mo-Cu nanocomposite with spherical particles of 50-100 nm in diameter and narrow size distribution. Combustion-synthesized Mo-Cu powders were consolidated by means of spark plasma sintering (SPS) at 1000 °C and pressure of 100 MPa in vacuum. The bulk material has demonstrated twofold enhanced microhardness as compared to microhardness of mechanically alloyed specimens.
- Subjects
THERMAL properties of alloys; COPPER compounds synthesis; MOLYBDENUM compounds synthesis; SELF-propagating high-temperature synthesis; COMBUSTION; REACTION mechanisms (Chemistry); METAL quenching; MICROHARDNESS
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 24, p16598
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-018-2787-1