Complexions at carbide / binder grain boundaries of Re-containing submicron cemented carbide

Development of Creep-Resistant Tungsten Carbide Copper Cemented Carbide

Fine-grained tungsten carbide copper (WC-Cu) cemented carbide was sintered via spark plasma sintering at 1773K using a fine WC powder with a mean particle size of 0.11 mm. The mechanical properties were compared with tungsten carbide cobalt (WC-Co) cemented carbide and a binderless WC-sintered material. The Vickers hardness and fracture toughness obtained by the indentation fracture method for ...

Development of Cemented Carbide Tool of Reduced Rare Metal Usage

Cemented carbides, including coated cemented carbides, account for 75% of the cutting tools market because of their features such as high hardness, toughness, and the responsiveness to iron, through the use of tungsten carbide for their main hard phases and cobalt for their bonding metals. The consumption of tungsten continues to increase as the amount of carbide tool production increases with ...

Theoretical Studies of the Atomic and Electronic Structures of Grain Boundaries in Silicon and Silicon-carbide

The atomic and electronic structures of a facetted twin boundary in Si and a twin boundary in 6-Sic have been studied theoretically for the first time. The atomic structure of the {211}/{111} facets in Si based on the model by Bourret and Bacmann has been optimised by the Keating model, and the electronic structure has been calculated using a supercell technique and a tight-binding model. It ha...

Pyrotechnic Smoke Compositions Containing Boron Carbide

Smokes are used on the battlefield for signaling, for marking targets, and for screening troop movements. Many high-performance compositions are toxic or hazardous, while non-toxic alternatives offer sub-par performance. The environmentally benign compositions described herein use boron carbide as a pyrotechnic fuel to produce thick clouds of white smoke. Experimentation and thermodynamic model...

Boron carbide/n-silicon carbide heterojunction diodes