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Conductive superhard material BxCy compound and preparation method thereof

A technology of superhard materials and compounds, applied in the direction of conductive materials, conductive materials, conductors, etc., can solve problems such as unrealized

Inactive Publication Date: 2008-02-13
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

People try to transform this compound into sphalerite or wurtzite structure compound under high temperature and pressure, but it has not been realized so far.

Method used

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  • Conductive superhard material BxCy compound and preparation method thereof

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Embodiment

[0020] Prepare boric acid and sucrose in a ratio of 1:3 and mix them evenly. Firstly, after a low-temperature chemical reaction below 300°C, a B-C compound containing H and O is obtained, and then put it into an alumina or graphite crucible, under the protection of flowing nitrogen. Then heat up to 1600°C in a resistance furnace for high-temperature treatment to remove H and O. The B-C precursor with high carbon content is obtained by controlling the raw material ratio and heating process parameters. Then mix the precursor and the Mg-Ni alloy catalyst and press it into a disc, or press the precursor and the alloy catalyst into a disc separately, put it into a high-pressure pressure chamber, and perform high-temperature and high-pressure synthesis on a six-sided top or two-sided top press. (1500°C, 6GPa), dissolve the recovered sample with a mixture of dilute sulfuric acid and dilute nitric acid to dissolve the catalyst, dry it, and finally obtain a conductive superhard materia...

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Abstract

The present invention relates to an electric superhard BxCy compound and the preparation method of the compound. The present invention is characterized in that the BxCy compound contains B of 5%-30%, C 70%-95% and a structure containing a sphalerite and a spiauterite; thereof the conductive B-C bond and C-C bond have the hybrid characteristic of sp3 and the rigidity is more than 40GPa. The preparation steps are as following: A precursor of the BxCy and a catalytic alloy of Mg-Ni are mixed and pressed to be a wafer or the precursor of the BxCy and the catalytic alloy of Mg-Ni are respectively pressed to be the wafer and then put into a pressure cavity of high pressure. The wafer is synthesized on a press at a high temperature between 1200 DEG C and 1800 DEG C and a high pressure between 3 GPa and 10 GPa. The catalyst of the obtained production is solubilized by a mixed liquor of a dilute sulfuric acid and a dilute nitric acid and then dried.

Description

technical field [0001] The invention relates to a conductive superhard material B x C y Compounds and methods for their preparation. Background technique [0002] Usually people refer to materials with a hardness greater than 40GPa as superhard materials. As we all know, diamond and cubic BN are the most typical superhard materials, but these two materials are good insulators; there are few materials with hardness greater than 40GPa in nature, and the hardness is around 40GPa, such as α-B, B 4 C (boron carbide), etc., but they are not conductive. α-B, boron carbide is made of B 12 The compound with rhombohedral structure stacked by icosahedra is a high hardness material with low density, high melting point, good chemical inertness and excellent neutron absorption characteristics, so it is widely used as electronic materials, nuclear Materials and fields such as military and pharmaceuticals. [0003] Diamond can be artificially synthesized from graphite under the action...

Claims

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Application Information

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IPC IPC(8): C01B31/36H01B1/00
Inventor 田永君何巨龙柳忠元徐波于栋利
Owner YANSHAN UNIV
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