Preventive action of silicon nitride at HT-HP sintering of cubic boron nitride

Autor:	Piotr Klimczyk, Yu. A. Mel’niichuk, M. V. Nikishina, I. A. Petrusha, T. I. Smirnova, A. S. Osipov
Rok vydání:	2015
Předmět:	Materials science Metallurgy High density Sintering Intergranular corrosion Nitride Block (periodic table) Inorganic Chemistry chemistry.chemical_compound Silicon nitride chemistry Boron nitride Percolation General Materials Science
Zdroj:	Journal of Superhard Materials. 37:222-233
ISSN:	1934-9408 1063-4576
DOI:	10.3103/s1063457615040024
Popis:	Special features of sintering cBN at the pressure ~ 7.7 GPa and temperature ~ 2300°C with addition of Si3N4 (~3 wt %) have been studied. It has been found that the Si3N4 addition makes it possible to block the penetrating percolation of melts from the outer medium, which results in an intergranular destruction. A material with an extremely high density (3.46 ± 0.02 g/cm3) has been developed for a wide application in cutting tools, including tools to machine hard alloys of the WC–Co group. The mechanism of the preventive protective action of Si3N4 has been discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e9d1f3c39bcb17c654e271207e517002 https://doi.org/10.3103/s1063457615040024 Zobrazit plný text záznamu Full text from SpringerLink