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Impregnating inorganic salt technology for anti-oxidation of carbon-graphite product

An anti-oxidation, carbon-graphite technology, applied in the field of carbon-graphite material preparation, can solve the problems of low anti-oxidation weight loss rate, etc., and achieve the effect of simple process and safe operation

Active Publication Date: 2019-03-29
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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  • Impregnating inorganic salt technology for anti-oxidation of carbon-graphite product
  • Impregnating inorganic salt technology for anti-oxidation of carbon-graphite product

Examples

Experimental program
Comparison scheme
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, and specifically discloses an impregnating inorganic salt technology for anti-oxidation of a carbon-graphite product. The technology comprises the following steps : (1) pressurizing and impregnating: (1.1) heating a product in a drying oven, putting the heated product in an impregnating barrel, and then putting the impregnating barrel together with the heated product in a stainless steel vacuum tank for vacuumizing; (1.2) introducing an impregnating solution a which is heated to a boiling state into an impregnatingvacuum tank under the condition of keeping a vacuum state, introducing air after the product is immerse in the impregnating solution, finally opening the vacuum tank and taking out the product and the impregnating barrel; (1.3) putting the product and the impregnating barrel in a lower bell jar of a hydraulic machine, and then sequentially sealing, pressurizing, maintaining pressure, relieving the pressure, pouring the impregnating solution and taking out the product; (2) curing the product; (3) carrying out secondary impregnation. Through the technology disclosed by the invention, the problem of high-temperature oxidation resistance of the carbon-graphite product can be solved, the situations that in the air of which the temperature is 650 DEG C, the anti-oxidation weight loss ratio is lower than 5 percent and the density increment rate is not smaller than 6 percent, and a treated material has no a moisture absorption phenomenon 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 Applications(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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