Inorganic salt impregnation process for anti-oxidation of carbon graphite products

An anti-oxidation and carbon graphite technology, which is applied in the field of carbon graphite material preparation, can solve the problem of low anti-oxidation weight loss rate and achieve the effects of low anti-oxidation weight loss rate, simple process and safe operation

Active Publication Date: 2021-07-16
ZIGONG DONGXIN CARBON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through this process, the problem of high-temperature oxidation resistance of carbon graphite products is solved, and the anti-oxidation weight loss rate is 5% lower in the air at 650°C, the density increase rate is ≮6%, and the treated material is guaranteed to have no moisture absorption in the air

Method used

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  • Inorganic salt impregnation process for anti-oxidation of carbon graphite products
  • Inorganic salt impregnation process for anti-oxidation of carbon graphite products

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Impregnation solution a formula (by mass percentage): 13.31% zinc phosphate, 0.60% aluminum phosphate, 30.64% phosphoric acid with a mass concentration of 85%, 0.16% boric acid, 55.29% water, and the total mass percentage is 100%.

[0026] Impregnation solution b formula (by mass percentage): 29.41% zinc phosphate, 1.33% aluminum phosphate, 67.73% phosphoric acid with a mass concentration of 85%, 1.53% boric acid, and the total mass percentage is 100%.

[0027] Carbon graphite product anti-oxidation impregnated inorganic salt process, it comprises the following steps:

[0028] The pretreatment of the product to be impregnated is: rough processing of carbon and graphite products, and then washing with water to remove impurities such as powder and ash on the surface of the product. After the product is dried, put it in a hot tank or an oven to dry at a temperature of 120±10°C, and the drying time should not be less than four hours before impregnating.

[0029] Then put t...

Embodiment 2

[0035] Impregnation solution a formula (by mass percentage): 10.59% zinc phosphate, 0.53% aluminum phosphate, 27.11% phosphoric acid with a mass concentration of 85%, 0.61% boric acid, 61.15% water, and the total mass percentage is 100%.

[0036] Impregnation solution b formula (by mass percentage): 27.27% zinc phosphate, 1.00% aluminum phosphate, 69.79% phosphoric acid with a mass concentration of 85%, 1.57% boric acid, and the total mass percentage is 100%.

[0037] Carbon graphite product anti-oxidation impregnated inorganic salt process, it comprises the following steps:

[0038] The pretreatment of the product to be impregnated is: rough processing of carbon and graphite products, and then washing with water to remove impurities such as powder and ash on the surface of the product. After the product is dried, put it in a hot tank or an oven to dry at a temperature of 120±10°C, and the drying time should not be less than four hours before impregnating.

[0039] Then put t...

Embodiment 3

[0045] Impregnation solution a formula (by mass percentage): 8.95% zinc phosphate, 0.45% aluminum phosphate, 22.91% phosphoric acid with a mass concentration of 85%, 0.52% boric acid, 67.18% water, and the total mass percentage is 100%.

[0046] Impregnation solution b formula (by mass percentage): 27.27% zinc phosphate, 1.37% aluminum phosphate, 69.79% phosphoric acid with a mass concentration of 85%, 1.57% boric acid, and the total mass percentage is 100%.

[0047] Carbon graphite product anti-oxidation impregnated inorganic salt process, it comprises the following steps:

[0048] The pretreatment of the product to be impregnated is: rough processing of carbon and graphite products, and then washing with water to remove impurities such as powder and ash on the surface of the product. After the product is dried, put it in a hot tank or an oven to dry at a temperature of 120±10°C, and the drying time should not be less than four hours before impregnating.

[0049] Then put the ...

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Abstract

The invention relates to the field of preparation of carbon graphite materials, in particular to a process of impregnating an inorganic salt for oxidation resistance of carbon graphite products. The process includes steps 1) pressurized impregnation, heating the product in an oven, putting the heated product into the impregnation barrel, and then putting the impregnation barrel together into a stainless steel vacuum tank to extract the vacuum; 1.2) under the condition of maintaining vacuum, Introduce the impregnation liquid a heated to boiling state into the impregnation vacuum tank; after the impregnation liquid submerges the product, let in the air, and finally open the vacuum tank, take out the product and the impregnation barrel; 1.3) Put the product and the impregnation barrel into the lower bell jar of the hydraulic press , and then sequentially perform sealing, adding air pressure, maintaining pressure, releasing pressure, pouring out the impregnation solution, and taking out the product; 2) curing the product; 3) secondary impregnation. Through this process, the problem of high-temperature oxidation resistance of carbon graphite products is solved, and the anti-oxidation weight loss rate is 5% lower in the air at 650°C, the density increase rate is ≮6%, and the treated material has no moisture absorption in the air.

Description

technical field [0001] The invention relates to the technical field of preparation of carbon graphite materials, in particular to a process of impregnating an inorganic salt for oxidation resistance of carbon graphite products. Background technique [0002] With the continuous development of science and technology, carbon graphite materials have become important materials in contemporary industry. Carbon graphite materials have unique self-lubricating properties, low thermal expansion rate and good wear resistance, and are widely used in the sealing field. A series of advantages such as high thermal resistance, high thermal shock resistance, low thermal expansion, low elasticity and easy finishing make it widely used in aero-engines and become an indispensable material for engine sealing. [0003] Carbon graphite material is a granular structure material, which is made of various raw materials by adding binders, kneading, forming, roasting, and graphitization. During the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/5048C04B41/87C04B35/522C04B41/4539C04B41/0072
Inventor 罗少伶叶大鑫鄢鹏宋延礼沈志麟夏尚能包丽娟罗玲莉
Owner ZIGONG DONGXIN CARBON CO LTD
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