Device for continuously growing carbon nanotubes and method adopting method

Abstract

The invention relates to the technical field of arc discharge heat plasma, in particular to an arc device for continuously growing carbon nanotubes and a method adopting the method. According to the device, a carbon-source substance is efficiently catalyzed and split under the double actions of high temperature and ion bombardment produced by arc heat plasma, recrystallization is performed, and the carbon nanotubes with high graphitization degree are generated. The device mainly comprises an arc chamber, a constant-temperature chamber and a deposition chamber which are connected in series sequentially through pipelines, wherein a metal anode and a graphite arc slot cathode with a bend are arranged in the arc chamber, gas to be subjected to arc striking is injected into the arc chamber by agraphite cuvette, and stable arc is formed after voltage is applied between two electrodes. A thermal insulation casing is adopted outside the arc chamber, the deposition chamber adopts a double-layer water-cooling stainless cavity wall, and a cage type collection device is arranged in the deposition chamber. After being catalyzed to be degraded by the arc chamber, the carbon source substance enters the constant-temperature chamber, starts to grow and finally deposits in the deposition chamber, and incompletely reacting gas can be further collected and injected into the combination device forcircular catalysis reaction.

Description

technical field [0001] The invention relates to the technical field of arc discharge thermal plasma methods, in particular to an arc device and method for continuously growing carbon nanotubes. Background technique [0002] Arc discharge is the strongest self-sustaining discharge method in gas discharge: when the power supply provides high-power electric energy, the voltage between the electrodes only needs tens of volts, and the gas between the two electrodes can continue to pass through a strong current (5~600A ) and is ionized to form a plasma, which generates a high temperature (2000~10000°C) and emits a strong brilliance at the same time. Under the dual effects of high-temperature arc and ion bombardment, it can even evaporate graphite, titanium, tungsten, molybdenum and other high-melting point substances, and recrystallize to obtain high-purity metals and alloys; arc discharge can also be used for halogenation and low boiling point of metal oxides. Thermal cracking o...

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Problems solved by technology

[0003] The arc discharge method is a traditional method for preparing carbon nanomaterials with high crystallinity. Chinese patents such as CN 1823006 A, CN2475983Y, CN 1765735 A and CN 102009974 A all introduce the use of traditional arc discharge methods to grow carbon nanomaterials by using graphite ablation electrodes. The arc device or method of the material, and the evaporation and ablation of the graphite electrode requires extremely high temperature (melting point is 3850±50°C, boiling point is 4250°C), which increases the overall energy consumption of the arc system; on the other hand, the ablated graphite The anode is easily exhausted due to its size. At this time, it is necessary to wait for the electric arc furnace to cool down completely, then empty the electric arc furnace, replace the graphite anode, and then vacuumize. The ionized gas is introduced to preheat and repeat the arc reaction, which greatly reduces the production efficiency and is difficult. For industrial mass production

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