Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Coated superhard particles and composite materials made from coated superhard particles
A method for coating superhard particles comprises mixing superhard particles with MoO3 particles, the ratio of the superhard particles to the MoO3 particles being between 1:1 and 1:10 by weight, heating the mixture in a vacuum or protective atmosphere at a first temperature of no more than 795°C and heating the mixture at a second temperature of at least 830°C in an inert gas at a pressure of between 0.1 and 10 MPa. During the increase from the first to the second temperature, at least one annealing process in a vacuum or protective atmosphere is preferably performed. After heating the mixture at the second temperature, a heat treatment in an atmosphere selected from a vacuum, hydrogen, nitrogen CO or CO2 may be performed. Also disclosed are coated particles having a superhard material core and a coating of molybdenum carbide. A composite material comprises the coated particles and a metallic binder comprising copper, silver or gold or alloys or mixtures thereof. A method of fabricating said composite material comprises forming a green body from a mixture of metallic binder material and the coated particles and electrical resistance sintering the mixture by applying current and pressure.
Coated superhard particles and composite materials made from coated superhard particles
A method for coating superhard particles comprises mixing superhard particles with MoO3 particles, the ratio of the superhard particles to the MoO3 particles being between 1:1 and 1:10 by weight, heating the mixture in a vacuum or protective atmosphere at a first temperature of no more than 795°C and heating the mixture at a second temperature of at least 830°C in an inert gas at a pressure of between 0.1 and 10 MPa. During the increase from the first to the second temperature, at least one annealing process in a vacuum or protective atmosphere is preferably performed. After heating the mixture at the second temperature, a heat treatment in an atmosphere selected from a vacuum, hydrogen, nitrogen CO or CO2 may be performed. Also disclosed are coated particles having a superhard material core and a coating of molybdenum carbide. A composite material comprises the coated particles and a metallic binder comprising copper, silver or gold or alloys or mixtures thereof. A method of fabricating said composite material comprises forming a green body from a mixture of metallic binder material and the coated particles and electrical resistance sintering the mixture by applying current and pressure.
Coated superhard particles and composite materials made from coated superhard particles
IGOR YURIEVICH KONYASHIN (Autor:in) / HAUKE HINNERS (Autor:in) / BERND HEINRICH RIES (Autor:in)
05.09.2018
Patent
Elektronische Ressource
Englisch
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