Preparation method of high-temperature-resistant graphite material

A technology of graphite material and high temperature resistance, which is applied in the field of preparation of high temperature resistant graphite materials, can solve the problems of long production cycle, cumbersome processing process, easy oxidation, etc., and achieve high temperature oxidation resistance, simple preparation process, and good bonding strength. Effect

Pending Publication Date: 2021-08-27
CHINA RAILWAY LONGCHANG MATERIALS
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Problems solved by technology

Aiming at the problem that graphite materials are easy to oxidize at high temperature, currently commonly used methods mainly include vapor phase deposition method, solid phase sintering method, silicone oil impregnation method, etc., but the above-mentioned methods have complex implementation process, low process control rate, long production cycle, and samples The pre-processing process is cumbersome and other problems, which cannot meet the actual application requirements

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  • Preparation method of high-temperature-resistant graphite material

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preparation example Construction

[0020] A preparation method of a high temperature resistant graphite material, comprising the following three stages:

[0021] First, the preprocessing stage:

[0022] The graphite is washed with distilled water and alcohol for 10-15 minutes in turn, and then filtered and dried for later use to remove impurities on the surface of the graphite.

[0023] The particle size of the graphite used above is 150-500 μm, and the carbon content in the graphite is ≥94 wt %.

[0024] Second, the inorganic salt impregnation stage:

[0025] 1) Weigh 2~12g of sodium tetraborate and sodium dihydrogen phosphate, then add 20~30ml of distilled water at 90~100°C, fully stir and mix until transparent, then add 1~5ml of phosphoric acid, stir well to prepare dipping solution A .

[0026] The purities of sodium tetraborate, sodium dihydrogen phosphate and phosphoric acid used above are all analytically pure, with a purity of 99.9%.

[0027] 2) Add 2-10 g of graphite into impregnation solution A fo...

Embodiment 1

[0032] A preparation method of high temperature resistant graphite.

[0033] 1) First weigh 10 g of sodium tetraborate and sodium dihydrogen phosphate, then add 20 ml of distilled water at 90 to 100°C, stir and mix until transparent, add 5 ml of phosphoric acid, and stir thoroughly to obtain dipping solution A.

[0034] 2) Add 2-10 g of graphite into the impregnation solution A for dipping, heat to 75°C, keep the temperature constant for 3 hours, filter, and dry at 80°C for 12 hours to obtain mixture B.

[0035] 3) The mixture B is placed in a muffle furnace, and heat-treated at 120-400° C. for 1-2 hours to obtain a high-temperature resistant graphite material.

Embodiment 2

[0037] A preparation method of high temperature resistant graphite.

[0038] 1) First weigh 8 g of sodium tetraborate and sodium dihydrogen phosphate, then add 20 ml of distilled water at 90 to 100°C, stir and mix until transparent, then add 4 ml of phosphoric acid, and stir thoroughly to prepare immersion solution A.

[0039] 2) Add 2 to 10 g of graphite into the impregnation solution A for dipping, heat to 75°C, keep the temperature constant for 3 hours, filter, and dry at 85°C for 13 hours to obtain mixture B.

[0040] 3) The mixture B is placed in a muffle furnace, and heat-treated at 120-400° C. for 1-2 hours to obtain a high-temperature resistant graphite material.

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Abstract

The invention discloses a preparation method of a high-temperature-resistant graphite material. The preparation method comprises the following steps: step 1, removing impurities on the surface of graphite; 2, performing inorganic salt impregnation on the graphite; and 3, carrying out heat treatment on the graphite impregnated with the inorganic salt. Compared with the prior art, the preparation method has the positive effects that the preparation process is simple, the cost is low, the main components of the used impregnation liquid are phosphate and borate, the high-temperature oxidation resistance of the impregnation liquid is mainly derived from a series of changes generated by decomposition of the borate and phosphate at high temperature, a layer of stable oxidation-resistant coating covers the surface or pores of the graphite, channels for oxidizing gas to diffuse into the graphite are reduced, and the high-temperature oxidation resistance of the graphite is improved. The prepared anti-oxidation coating covered by the graphite powder has good bonding strength with graphite.

Description

technical field [0001] The invention relates to the technical field of graphite powder, in particular to a preparation method of a high temperature resistant graphite material. Background technique [0002] Graphite materials are widely used in aerospace, high-speed rail, metal smelting, refractory materials, nuclear power industry, petroleum machinery due to their good corrosion resistance, thermal conductivity, excellent mechanical properties, and high thermal stability. and other fields. However, graphite materials have strong oxidation sensitivity, and begin to be oxidized and decomposed at about 400 °C in the atmospheric environment, and the oxidation weight loss becomes more and more significant with the increase of temperature, which seriously restricts the further application of graphite materials in high temperature fields. Therefore, it is of great significance to improve the high temperature oxidation resistance of graphite and prolong the service life of the mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21
CPCC01B32/21
Inventor 庾正伟宋川刘锦霖陈奎徐腈蔓田雅萍
Owner CHINA RAILWAY LONGCHANG MATERIALS
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