Preparation method of annealed pyrolytic graphite with very high heat conductivity

A technology of pyrolytic graphite and thermal conductivity, applied in the direction of graphite, etc., can solve the problems of thermal conductivity decline and limited application, and achieve the effect of complete sheet structure and good thermal conductivity

Pending Publication Date: 2018-11-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are also many reports and patents about high thermal conductivity graphite materials in China, such as: Chinese patent (publication number CN103011141A), which adopts carbonization of polyimide film in a protective atmosphere, and is processed by graphitization (2500-3000 ° C). The thermal conductivity of the obtained high thermal conductivity graphite film can also reach 1600W / (m·k), but its thickness is only 0.0125mm-0.075mm, and the thermal conductivity will decrease significantly when the thickness is increased, which limits its application in the aviation and aerospace fields. application

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  • Preparation method of annealed pyrolytic graphite with very high heat conductivity
  • Preparation method of annealed pyrolytic graphite with very high heat conductivity

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Embodiment 1

[0026] In this embodiment, the deposition temperature is 2000°C, and the flow rate of propane gas is 0.4m 3 / h, nitrogen flow rate 0.6m 3 / h, the deposition substrate is 6 graphite plates with a size of 420×100 mm, and the surface of the graphite plates is polished. Put the graphite plate into the induction furnace, turn on the vacuum pump to remove the air in the induction furnace, and raise the temperature to 2000°C at a rate of 15°C / min. At this time, the vacuum degree in the induction furnace is 150Pa, and nitrogen and propane are introduced at the same time for chemical vapor deposition. . The deposition time was 5 hours, and a deposited pyrolytic graphite plate with a size of 420×100×1.5 mm was obtained.

[0027] Process the PG plate into a PG sheet of 200×90×1mm, put it into a graphitization furnace and pressurize it at 0.5 MPa, and heat it at 2900°C for 1 hour. State pyrolytic graphite sheet, its thermal conductivity is 1721W / (m·k).

[0028] like figure 2 As show...

Embodiment 2

[0030] In this embodiment, the deposition temperature is 1950°C, and the flow rate of propane gas is 0.45m 3 / h, nitrogen flow rate 0.8m 3 / h, the deposition substrate is 6 graphite plates with a size of 420×120 mm, and the surface of the graphite plates is polished. Put the graphite plate into the induction furnace, turn on the vacuum pump to remove the air in the induction furnace, and raise the temperature to 1950°C at a rate of 15°C / min. At this time, the vacuum degree in the induction furnace is 160Pa, and nitrogen and propane are introduced at the same time for chemical vapor deposition. . The deposition time was 30 hours, and a deposited pyrolytic graphite plate with a size of 420×120×7 mm was obtained.

[0031] Process the PG plate into a PG sheet of 100×60×4mm, put it into a graphitization furnace and pressurize it at 0.5MPa, heat treatment at 3000°C for 3 hours, and cool to room temperature with the furnace after heat treatment to obtain annealed with ultra-high th...

Embodiment 3

[0033] In this embodiment, the deposition temperature is 2100°C, and the flow rate of propane gas is 0.35m 3 / h, nitrogen flow rate 0.9m 3 / h, the deposition substrate is 6 graphite plates with a size of 420×150 mm, and the surface is polished. Put the graphite plate into the induction furnace, turn on the vacuum pump to remove the air in the induction furnace, and raise the temperature to 2100°C at a rate of 15°C / min. At this time, the vacuum degree in the induction furnace is 100Pa, and nitrogen and propane are introduced at the same time for chemical vapor deposition. . The deposition time was 40 hours, and a deposited pyrolytic graphite plate with a size of 420×150×15 mm was obtained.

[0034] Process the PG plate into a 200×100×12mm PG sheet, put it in a graphitization furnace and pressurize it at 5MPa, heat treatment at 2800°C for 8 hours, and cool to room temperature with the furnace after heat treatment to obtain an annealed state with ultra-high thermal conductivity...

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Abstract

The invention relates to the field of pyrolytic carbon materials, in particular to a preparation method of annealed pyrolytic graphite with very high heat conductivity, comprising the steps of (1) preparing pyrolytic graphite, to be specific, preparing precipitated pyrolytic graphite material on a graphite substrate via a medium-frequency induction furnace by means of chemical vapor deposition through temperature control, gas flow control, reaction time control and the like; (2) subjecting the pyrolytic graphite to high-temperature high-pressure thermal treatment, to be specific, processing the prepared precipitated pyrolytic graphite material to required size, adding into a graphite mold with smooth surface, and performing high-temperature high-pressure thermal treatment to obtain the annealed pyrolytic graphite with very high heat conductivity. The annealed pyrolytic graphite prepared via the preparation method has heat conductivity in ab direction, up to 1600 W / (m k) and above.

Description

technical field [0001] The invention relates to the field of pyrolytic carbon materials, in particular to a method for preparing annealed pyrolytic graphite with ultra-high thermal conductivity. Background technique [0002] With the rapid development of my country's aerospace technology, the integration of electronic equipment components is getting higher and higher, and its heat consumption and heat flux density are also doubled. At the same time, strict requirements are placed on the lightweight of materials. Traditional aluminum, The thermal conductivity and high density of metal materials such as copper and silver can no longer meet their needs. Compared with metal materials, high thermal conductivity graphite material has the characteristics of light weight and large thermal conductivity. As a heat dissipation material, it can not only meet the thermal conductivity of the device, but also effectively reduce the weight of the device. It is a category with the most develo...

Claims

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Application Information

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IPC IPC(8): C01B32/21
CPCC01B32/21
Inventor 朱振国白朔徐红军成会明吴峻峰杜海峰王硕
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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