Preparation method for high-strength high-density isotropic impregnation silver carbon/graphite composite material

An isotropic, composite material technology, applied in the field of preparation of immersion silver graphite matrix material, can solve the problems of high manufacturing technical difficulty and high cost, achieve excellent electrochemical resistance, increased bulk density and flexural strength, high corrosion resistance sexual effect

Inactive Publication Date: 2016-01-06
CHENGDU ZHONGCHAO CARBON SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of silver-impregnated graphite M191G* not only has good mechanical strength, but also has the characteristics

Method used

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  • Preparation method for high-strength high-density isotropic impregnation silver carbon/graphite composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The first step: kneading of raw materials, kneading needle coke, pitch and catalyst evenly at a certain temperature (asphalt liquefaction temperature, ≯180°C), the best ratio of needle coke and pitch is 40:70, requiring needle coke Pre-crushing, the optimum particle size is 95% of the powder particle size <44μm, the external catalyst is boron carbide, the mass ratio is between 0.5% and 10%; the second step: secondary crushing, cooling the kneaded coke mixture , crushed into powder, the best crushing effect is 95% of the powder particle size <44μm;

[0057] The third step: forming and graphitization, the blank powder is formed by isostatic pressing, and then roasted, the roasting temperature is between 2600 and 3000 °C;

[0058] The fourth step: high-temperature purification, the product obtained by roasting is purified by halogen gas at 2200-2600 °C to remove impurities such as boron, and obtain high-purity and high-isotropy graphite. This embodiment does not require a...

Embodiment 2

[0060] Step 1: Mix raw materials, knead the binder and aggregate in a kneader (kneading temperature ≯ 150°C) at a ratio of (0.3-0.7): 1, and then pulverize to a powder with a particle size of <0.5mm. The binder is the lipid material of pitch, phenolic resin, furfural resin or epoxy resin, and the aggregate is natural microcrystalline graphite, graphite return material, petroleum coke, pitch coke, secondary coke, mesocarbon microspheres, etc. Natural microcrystalline graphite accounts for 30% to 100% of the mass of the aggregate, and the particle size of each aggregate is between 1 and 150 μm; it can also be carried out by using the following steps: first prepare the binder and the corresponding solvent to 5 to 70 wt% Binder solution, then prepare aggregate powder and binder solution at a ratio of 1: (0.5-0.1) to make a slurry, spray dry to obtain a powder with a particle size of <200 μmm, and the spray temperature ≥ the boiling point of the solution;

[0061] The second step: ...

Embodiment 3

[0064] The first step: raw material crushing, select Taixi anthracite raw coal powder with a degree of graphitization > 60%, and crush it, requiring more than 95% of the powder particle size to be ≤ 75 μm;

[0065] The second step: forming, using isostatic pressing, the forming pressure is 100-140Mpa;

[0066] The third step: one-time roasting, the green body is roasted at 800-1400°C, the heating rate is ≤3°C / h, the highest temperature is kept at 18-30°C, and the specific heating system; Stage 1: 100-350°C, heating rate: ≤2.5 ℃ / h, stage 2: 350~400℃, heating rate: ≤1℃ / h; stage 3: 400~500℃, heating rate: ≤0.7℃ / h; stage 4: 500~600℃, heating rate: ≤ 1°C / h; stage 5: 600~700°C, heating rate: ≤1.4°C / h; stage 6: 700~800°C, heating rate: ≤2°C / h; stage 7: 800~1100°C, heating rate: ≤3℃ / h;

[0067]The fourth step: impregnation, preheat the roasted compact to 330°C, then transfer it to a pressure-resistant container filled with coal tar pitch with a softening point of 150°C, and slowly h...

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Abstract

The invention provides a preparation method for a high-strength high-density isotropic impregnation silver carbon/graphite composite material and is aimed at providing a preparation method for a stable high-strength long-service-life carbon graphite material. According to the technical scheme, firstly, a carbon graphite substrate material matched with impregnation silver is prefabricated, and an isotropic graphite material substrate is prepared through an isostatic pressing forming method; then the isotropic graphite material substrate reaches performance parameters matched with an impregnation silver process through continuous impregnation, roasting, impregnation angle changing and other processes; and afterwards silver is impregnated under the circumstances of high temperature and high pressure, so that the silver penetrates the network structure of the carbon graphite substrate, and the high-strength long-service-life carbon graphite/ silver composite material with carbon graphite as the substrate is formed. According to the preparation method, the mechanical strength of the carbon graphite/ silver composite material can be significantly improved; the carbon graphite/ silver composite material is good in friction coefficient, thermal conductivity, radiation resistance and low in abrasion loss, and the requirement for the service life of the material above 60 years is met.

Description

technical field [0001] The present invention is about compressive strength up to 200MPa, volume density > 2.4g / cm 3 The preparation method of the above high-strength and high-density fine-grained carbon graphite material, especially the preparation method of the silver-impregnated graphite base material with isostatic pressing molding and nuclear power material grade M191G*. Background technique [0002] Carbon / graphite materials have been widely used in many industrial fields because of their outstanding advantages such as good electrical conductivity, thermal conductivity, high temperature resistance, corrosion resistance, self-lubrication, good chemical stability, and low thermal expansion coefficient. The high-temperature wear-resistant sealing material has low mechanical strength and poor wear resistance, and is also limited by the preparation process, leaving many straight air holes inside. In the prior art, in order to solve the shortcomings of the above-mentioned...

Claims

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Application Information

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IPC IPC(8): B22D19/00C01B31/04
CPCY02P20/129
Inventor 侯玉杰程诺
Owner CHENGDU ZHONGCHAO CARBON SCI & TECH
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