Effects of carbide grain growth inhibitors on the microstructures and mechanical properties of WC–SiC–Mo2C hard ceramics

Autor:	Naomi Takahashi, Shigeaki Sugiyama, Hitoshi Taimatsu, Akihiro Nino
Rok vydání:	2014
Předmět:	Equiaxed crystals Materials science Metallurgy Microstructure Carbide chemistry.chemical_compound Grain growth Fracture toughness chemistry Tungsten carbide visual_art visual_art.visual_art_medium Silicon carbide Ceramic
Zdroj:	International Journal of Refractory Metals and Hard Materials. 43:150-156
ISSN:	0263-4368
Popis:	Cr3C2, NbC, or ZrC was added to WC–4.85 mol% SiC–1 mol% Mo2C ceramics and sintered at 1600 °C using a resistance-heated hot-pressing machine. Dense ceramics containing 0–0.3 mol% Cr3C2, 0–3 mol% NbC, and 0–10 mol% ZrC were obtained. An additive carbide-based solid solution was observed only for NbC and ZrC additions. The coarse plate-like WC grains disappeared with the addition of Cr3C2, NbC, or ZrC and the ceramics consisted of fine equiaxed WC grains. Higher hardnesses, 19.4–21.8 GPa, were measured for the carbide-added WC–SiC–Mo2C ceramics than for the WC–4.85 mol% SiC ceramics because of the disappearance of coarse plate-like grains. The addition of a small amount of ZrC improved the fracture toughness without reducing the hardness.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b45e75e5b2c25edf9a65da9cdebf8bdf https://doi.org/10.1016/j.ijrmhm.2013.11.016 Zobrazit plný text záznamu Full Text from ScienceDirect