Method for preparing helical carbon fiber

Abstract

The invention relates to a method for preparing a spiral carbon fiber. The method is characterized in that graphite is used as a basal body and is subjected to deoiling, sensitizing, activation treatment to form an even nickel-phosphorus alloy layer on the surface of the graphite through a chemical plating process, and the nickel-phosphorus alloy layer is used as a catalyst; under the action of a compound containing S, N2 is used as carrier gas; the flow of reaction gas C2H2 / H2 is controlled to be between 1 / 2 and 1 / 6; the reaction temperature is between 600 and 800 DEG C; the reaction time is between 1 and 3 hours; and the carbon fiber with two spiral structures is prepared, namely a single spiral carbon fiber and a double spiral carbon fiber. The diameter of a spiral tube is between 0.5 and 9 mu m; the thread pitch is between 0.1 and 3 mu m; and the length reaches the spiral carbon fiber of millimeter level. The method is simple, convenient and easy to operate, has an even and dense plating layer, good particle dis paster persity and high catalytic activation; the manufactured spiral carbon fiber has high purity and yield and can control the spiral shape of the spiral carbon fiber through changing the reaction condition.

Description

technical field [0001] The invention relates to a method for preparing spiral carbon fibers, specifically, a Ni-P alloy catalyst with fine particles, uniform dispersion and high catalytic activity is prepared on a graphite substrate by an electroless nickel plating process, and spiral carbon is prepared by a chemical vapor deposition method fiber. Background technique [0002] As a new type of carbon material, helical carbon fiber not only has excellent properties such as low density, high specific strength, heat resistance, electrical and thermal conductivity, and chemical stability, but also has a typical chirality due to its special helical shape. , good elasticity, and good combination with the matrix, it is expected to be used as high-performance reinforced composite materials, new electromagnetic wave absorbers, gas storage, biosynthesis catalysts, micro-inductors, micro-springs and other micro-mechanical components. [0003] At present, the chemical vapor deposition ...

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Problems solved by technology

[0003] At present, the chemical vapor deposition method is mostly used for spiral carbon fibers. Chinese patent CN1327093 discloses that acetylene is used as a carbon source, hydrogen is used as a reducing gas, and N 2 As a carrier gas, under the action of Ni powder as a catalyst and thiophene, helical carbon fibers are prepared by catalytic pyrolysis. In addition, Chinese patent CN1641083 discloses the use of certain transition metal sulfides or phosphides and their composites as catalysts to prepare helical carbon fibers. However, in the preparation process, there is a problem of uneven dispersion of catalyst powder on the substrate. The dispersion of catalyst is very important to the yield and output of spiral carbon fiber, which directly hinders the industrialization process of spiral carbon fiber.

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