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Preparation method of ablation-resistant carbon-graphite material

A carbon-graphite and ablation-resistant technology, applied in the field of preparation of ablation-resistant carbon-graphite materials, can solve the problems of low bulk density and easy cracking of high-density graphite materials, so as to increase the amount of pitch coking, shorten the production cycle, and improve the The effect of decoking amount

Active Publication Date: 2018-11-30
哈尔滨电碳厂有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that existing graphite materials have low bulk density and high-density graphite materials are prone to cracking during the roasting process, the invention provides a method for preparing an ablation-resistant carbon material, and the adopted technical scheme is as follows:

Method used

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  • Preparation method of ablation-resistant carbon-graphite material
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  • Preparation method of ablation-resistant carbon-graphite material

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preparation example Construction

[0037] A kind of preparation method of ablation-resistant carbon-graphite material of the present invention, at first the petroleum coke powder and modified pitch powder below 0.5mm in particle diameter, the petroleum coke powder and graphite powder below 0.1mm in particle diameter, according to particle diameter The content of petroleum coke powder below 0.5mm is 15-35wt%, the content of graphite powder is 5-15wt%, the content of petroleum coke powder with particle size below 0.1mm is 30-50wt%, and the content of modified asphalt powder is 20-30wt% %, mix at room temperature for 1-2 hours, mix thoroughly to obtain the mixture; heat and mix the mixture for 1-2 hours, control the temperature at 130°C-140°C during the heating and mixing process, and then roll the sheet at 130-150°C, The thickness of the rolled sheet is less than 2mm, and the rolled sheet is cooled, crushed and ground to a particle size of less than 0.5mm, and made into pressed powder; the pressed powder is put in...

Embodiment 1

[0044] This example provides a method for preparing modified asphalt, which is to heat the medium-temperature asphalt to 280°C-320°C, and pass compressed air (which can be realized by an air compressor) into the medium-temperature asphalt during the heating process, compressing The air blowing volume is controlled at 0.025m 3 / min, raise the softening point of asphalt to 110-120°C, add catalyst sulfur, stir to obtain modified asphalt, and crush the modified asphalt into powder to obtain modified asphalt powder.

[0045] GB / T8727-2008 standard test method is used to test the coke analysis value before and after modified asphalt. The coke analysis value of ordinary medium temperature asphalt before modification is 30%, and the coke analysis value of modified asphalt after modification can reach 60%. , so the coke analysis value of pitch can be increased from 30% to 60% by the modification method of the present invention.

Embodiment 2

[0047] This embodiment provides a preparation method of ablation-resistant carbon graphite material. In this embodiment, the modified asphalt powder is the modified asphalt powder prepared in Example 1. First, petroleum coke powder with a particle size below 0.5 mm and modified Asphalt powder, petroleum coke powder and graphite powder with a particle size of less than 0.1mm, the content of petroleum coke powder with a particle size of less than 0.5mm is 20wt%, and the content of graphite powder is 5wt%, and the petroleum coke powder with a particle size of less than 0.1mm The content of coke powder is 45wt%, the content of modified asphalt powder is 30wt%, mix at room temperature for 1.5h, and mix well to obtain a mixture; heat and mix the mixture for 1.5h, and control the temperature at 130-140°C during the heating and mixing process. Then roll the sheet at a temperature of 135°C, the thickness of the rolled sheet is below 2mm, and the rolled sheet is cooled, crushed and groun...

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Abstract

The invention discloses a preparation method of an ablation-resistant carbon-graphite material, and belongs to the technical field of carbon material processing. The method comprises the following steps: mixing petroleum coke powder with a particle size of 0. 5mm or below, graphite powder, petroleum coke powder with a particle size of 0.1mm or below and the modified asphalt powder at room temperature, carrying out mixing by heating, carrying out rolling, then carrying out crushing and grinding to obtain press powder, putting the press powder into a drying oven for carrying out drying, then pressing the press powder in a mould with a temperature of 130-150 DEG C at a pressure of 30-50 MPa for finishing hot-press molding, placing the formed material in a closed crucible for roasting, carrying out two-time asphalt impregnation by taking asphalt as an impregnant, repeating the roasting and asphalt impregnation processes for 2-3 times, and finishing graphitization to obtain the carbon-graphite material. According to the invention, the four raw materials are reasonably proportioned, and the asphalt modification, the hot-press molding and the pressurized roasting process are combined, sothat the carbon-graphite material with high strength, high density, high graphitization degree, high-temperature resistance, abrasion resistance and thermal shock resistance is prepared.

Description

technical field [0001] The invention relates to a preparation method of an ablation-resistant carbon graphite material, belonging to the technical field of carbon material preparation. Background technique [0002] Since the ramjet nozzle is uncooled, it has very strict requirements on the material, not only to withstand thermal load and thermal shock, but also to undergo chemical corrosion. High-density and high-strength graphite materials have high density, good thermal stability, and excellent high-temperature mechanical properties, thermophysical properties and good corrosion resistance. It is a better corrosion-resistant material for solid rocket motors. [0003] Traditional graphite materials generally use medium-temperature pitch as the binder. The coke analysis value of ordinary medium-temperature pitch is low, resulting in low volume density of graphite products after roasting, which affects the corrosion resistance and thermal shock resistance of the products. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532C04B35/622C04B35/645
CPCC04B35/522C04B35/532C04B35/622C04B35/645C04B2235/616C04B2235/6562C04B2235/6567C04B2235/77
Inventor 陈明礼梁世林吕洪全马庆春刘文丰
Owner 哈尔滨电碳厂有限责任公司
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