STUDY OF CONSOLIDATION FEATURES FOR FRAGMENTALLY NANOSTRUCTURED HARD METAL COMPOSITES

Описание

Перевод названия: ИЗУЧЕНИЕ ОСОБЕННОСТЕЙ КОНСОЛИДАЦИИ ФРАГМЕНТАРНО НАНОСТРУКТУРИРОВАННЫХ ТВЕРДОСПЛАВНЫХ КОМПОЗИТОВ

Тип публикации: статья из журнала

Год издания: 2018

Ключевые слова: твердосплавные композиты, нанопорошки керамики, ингибиторы, композитные карбиды, моделирование и параметры микроструктуры, трещиностойкость, hard metal composites, nanopowders of ceramic, inhibitors, composite carbides, modeling and micro- structure parameters, fracture resistance

Аннотация: The results of experimental studies combined with modeling and prediction methods for the properties of hard metal composites show that modification with additives of ceramic nanoparticles and composite powders (WC-Co) allows to control microstructure parameters and provides the increase in binding durability and the level of physicomechanical properties of a hard alloy in general. Simultaneous complex application of submicrocrystalline WC carbides coated with Co layer and alloying additives of Al2O3 nanoparticles - grain growth inhibitors of the main phase, can be consid- ered as the most perspective direction of nanostructured hard metal with increased hardness, strength and crack resis- tance production. The coating of carbide particles with a binder layer is an effective starting method that allows to ob- tain a volumetric billet with maintaining the unique properties of the initial nanopowders and ensures a uniform distri- bution of the phases (WC, Co, Al2O3). Such a multiphase fragmented nanostructured composite is characterized by additional heterogeneity, determined by differences in size and elastic phases properties. By combining the sizes and properties of the phase components in such a heterogeneous composite, it is possible to provide an increase in the frac- ture energy, i. e., Palmkvist crack resistance up to 16-18 MPa m1/2 (due to inhibition on nanoparticles inclusions, stress reliefs and changes in intercrystalline crack trajectory, its length decrease). Based on the proposed stereological mod- els and the experimentally established relationships between composition and microstructure parameters, the required volume concentrations of nanoparticles additives and composite powders (WC-Co) were determined.

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Номера страниц: 108-119

Авторы

  • Gordeev Yu.I. (Siberian Federal University)
  • Jasinski V.B. (Siberian Federal University)
  • Anistratenko N.E. (Siberian Federal University)
  • Binchurov A.S. (Siberian Federal University)
  • Vadimov V.N. (JSC “Academician M. F. Reshetnev” Information Satellite Systems”)

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