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A kind of preparation method of high-performance graphite sealing material

A graphite-sealed, high-performance technology, applied in manufacturing tools, ceramic molding machines, etc., can solve the problems of insufficient compact structure, waste of raw materials, large porosity, etc., and achieve the effect of increasing the rate of roasting yield, reducing production costs, and improving quality

Active Publication Date: 2019-09-10
哈尔滨电碳厂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Coke powder is one of the raw materials of graphite sealing materials. In the traditional preparation process of graphite sealing materials, old-fashioned grinding equipment is mostly used to prepare coke powder. The obtained coke powder has a particle size of about 50 μm. The coke powder with this particle size is used to prepare graphite sealing materials. There are disadvantages of not dense enough structure and large porosity
[0004] In the traditional graphite sealing material preparation process, most of the compression molding process is prepared into a solid core blank, which is then used in the subsequent roasting process, but in the subsequent process of preparing the graphite sealing material into a product, it needs to be shaped to remove useless parts. Waste is more serious
[0005] Using the roasting process of traditional graphite sealing materials, roasting large-scale, fine-grained annular products is prone to shrinkage and deformation, resulting in a large number of cracks

Method used

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  • A kind of preparation method of high-performance graphite sealing material
  • A kind of preparation method of high-performance graphite sealing material
  • A kind of preparation method of high-performance graphite sealing material

Examples

Experimental program
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Embodiment 1

[0048] This embodiment provides a method for preparing an ablation-resistant carbon material, the method comprising the following steps:

[0049] 1) Mix ultrafine coke powder with a particle size below 10 μm, graphite powder with a particle size below 50 μm, and pitch coke powder with a particle size below 50 μm to obtain a mixture; wherein: the total weight of the mixture is 100% Calculated, the three components are mixed according to the following weight percentages in the mixture: the content of superfine coke powder is 70wt%, pitch coke powder is 20wt%, graphite powder 10wt%;

[0050] 2) Add medium-temperature asphalt with a softening point of 93°C and a carbon residue rate of 40wt% to the mixture obtained in step 1) according to 45wt% of the total mixture, knead for 3 hours until the material temperature reaches 160°C, and then roll at 130°C , the thickness of the rolled sheet is less than 2 mm, and the rolled sheet is cooled and then crushed and ground to a particle size...

Embodiment 2

[0065] The difference between this embodiment and Example 1 is that each raw material formula is different, specifically: the total weight of the mixture is 100% in the present embodiment step 1), and the three components are mixed according to the following weight percentages in the mixture: The content of fine coke powder is 70wt%, graphite powder is 5wt%, and pitch coke powder is 25wt%. In step 2), pitch is added by 50wt% of the total mixture.

[0066] The product density that present embodiment obtains is 1.87g / cm , Shore hardness 53, degree of graphitization 88%

Embodiment 3

[0068] The difference between this embodiment and Example 1 is that each raw material formula is different, specifically: the total weight of the mixture is 100% in the present embodiment step 1), and the three components are mixed according to the following weight percentages in the mixture: The content of fine coke powder is 65wt%, graphite powder is 15wt%, and pitch coke powder is 20wt%. In step 2), pitch is added by 40wt% of the total mixture.

[0069] The product density that present embodiment obtains is 1.83g / cm 3 , Shore hardness 51, graphitization degree 87%.

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Abstract

The invention discloses a preparation method for a high-performance graphite sealing material, belonging to the technical field of carbon material processing. The method comprises the following steps:uniformly mixing ultrafine coke powder with a particle size of 10 [mu]m or less, graphite powder with a particle size of 50 [mu]m or less, and pitch coke powder with a particle size of 50 [mu]m or less, then adding medium-temperature asphalt with a softening point of 70-100 DEG C and a residual carbon ratio of 30-50wt%, and carrying out mixing, kneading, flaking, cooling, crushing and milling successively so as to obtain compressed powder; and subjecting the compressed powder to compression molding with an annular compression mold, roasting an annular prefabricated green body in a closed crucible, carrying out impregnation after completion of roasting, and carrying out graphitization in a graphitization furnace after completion of impregnation so as to obtain the graphite sealing materialafter graphitization. The prepared graphite sealing material of the invention has the advantages of uniform compactness, good wear resistance, high degree of graphitization, high mechanical strength,low porosity, improved molding rate and calcination yield, and reduction in raw material consumption and production cost.

Description

technical field [0001] The invention relates to a preparation method of a high-performance graphite sealing material, belonging to the technical field of carbon material processing. Background technique [0002] With the continuous development of my country's aviation industry, the technical requirements for aviation graphite sealing materials are getting higher and higher. Graphite sealing materials for an aero-engine are completely dependent on imports, and there is no such material in China that can meet the requirements for use. The technical index of the graphite sealing material prepared by the invention meets the use requirement and fills up the gap in the country. [0003] Coke powder is one of the raw materials of graphite sealing materials. In the traditional preparation process of graphite sealing materials, old-fashioned grinding equipment is mostly used to prepare coke powder. The obtained coke powder has a particle size of about 50 μm. The coke powder with thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/532C04B35/64B28B7/00
Inventor 陈明礼梁世林马庆春邵泽钦吕洪全殷景峰
Owner 哈尔滨电碳厂有限责任公司
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