Abstract:
A process for the synthesis of carbon coatings on the surface of metal carbides, preferably SiC, by etching in a halogen-containing gaseous etchant, and optionally hydrogen gas, leading to the formation of a carbon layer on the metal carbide. The reaction is performed in gas mixtures containing 0 to two moles of hydrogen for every two moles of halogen gas, preferably about 0.5 to one mole of hydrogen gas for eery two moles of halogen gas, at temperatures from about 100 DEG C to about 4,000 DEG C. preferably about 800 DEG C to about 1,000 DEG C, over any time range, maintaining a pressure of preferably about one atmosphere.
Abstract:
A process for the synthesis of carbon coatings on the surface of metal carbides, preferably SiC, by etching in a halogen-containing gaseous etchant, and optionally hydrogen gas, leading to the formation of a carbon layer on the metal carbide. The reaction is performed in gas mixtures containing about 0 % (trace) amounts to 100 % halogen-containing gaseous etchant, e.g., Cl2, and about 0 % to 99.9 % H2 (hydrogen gas) at temperatures from about 100 DEG C to about 4,000 DEG C, preferably about 800 DEG C to about 1,200 DEG C, over any time range, maintaining a pressure of preferably about one atmosphere, to about 100 atmospheres.
Abstract:
Rodamiento dispuesto como parte de un dispositivo mecánico, incluyendo dicho dispositivo mecánico una parte sólida en contacto de fricción con dicho rodamiento, de manera que hay un movimiento relativo entre dicha parte sólida y dicho rodamiento cuando se acciona el dispositivo mecánico, en el que el rodamiento está formado a partir de un carburo metálico que se empobrece metálicamente en la superficie del rodamiento para proporcionar una capa superficial de carbono, comprendiendo la capa superficial de carbono una subcapa de carbono interna que tiene una relación de intensidad pico Raman de 1D/1G de 0, 8 a 1, 20, y una subcapa de carbono externa más grafitizada.
Abstract:
A process for the synthesis of carbon coatings on the surface of metal carbides, preferably SiC, by etching in a halogen-containing gaseous etchant, and optionally hydrogen gas, leading to the formation of a carbon layer on the metal carbide. The reaction is performed in gas mixtures containing 0 to two moles of hydrogen for every two moles of halogen gas, preferably about 0.5 to one mole of hydrogen gas for eery two moles of halogen gas, at temperatures from about 100° C. to about 4,000° C., preferably about 800° C. to about 1,000° C., over any time range, maintaining a pressure of preferably about one atmosphere.