阅读说明：本技术 用于受电弓的高强度耐磨碳滑板及其制备方法 (High-strength wear-resistant carbon sliding plate for pantograph and preparation method thereof ) 是由 臧文平 王晋 张臣 于 2020-07-24 设计创作，主要内容包括：本发明公开了一种用于受电弓的高强度耐磨碳滑板,由干粉混合料与其质量27-35％的液态沥青经混捏、挤压、焙烧后制得,所述干粉混合料由以下质量百分比的原料充分混合而成：0.5-0.2mm粒度的沥青焦粒10％-30％,0.2-0mm粒度的沥青焦粒15％-30％,沥青焦粉30％-40％,石墨粉5％-20％,碳黑5％-10％。本发明还公开其制备方法。本发明从产品性能综合考虑,合理配置各品种粒级的原料,从原料配比上提高了产品基础性能；严格控制混捏时速和混捏温度,提高了产品内在结构状态；通过预压挤压成型均匀了产品密实度,减少了内裂分层问题；通过焙烧升温曲线的设计减少了焙烧变形裂纹和填充料的配置避免了产品粘砂,提高了成品率,从而从整体上改善了受电弓碳滑板的结构性能,使其各项理化指标达到国内先进水平。(The invention discloses a high-strength wear-resistant carbon sliding plate for a pantograph, which is prepared by kneading, extruding and roasting a dry powder mixture and 27-35% of liquid asphalt by mass, wherein the dry powder mixture is prepared by fully mixing the following raw materials in percentage by mass: 10-30% of asphalt coke particles with the granularity of 0.5-0.2mm, 15-30% of asphalt coke particles with the granularity of 0.2-0mm, 30-40% of asphalt coke powder, 5-20% of graphite powder and 5-10% of carbon black. The invention also discloses a preparation method of the composition. The invention takes the product performance into comprehensive consideration, reasonably allocates raw materials of various particle sizes, and improves the basic performance of the product in terms of raw material proportion; the kneading speed per hour and the kneading temperature are strictly controlled, so that the internal structural state of the product is improved; the product compactness is uniform through prepressing and extrusion molding, and the problem of internal cracking and delamination is reduced; through the design of the roasting temperature rise curve, the roasting deformation cracks and the configuration of the filler are reduced, the sand sticking of the product is avoided, and the yield is improved, so that the structural performance of the carbon pantograph slide plate is integrally improved, and various physical and chemical indexes of the carbon pantograph slide plate reach the domestic advanced level.)

1. A high-strength wear-resistant carbon sliding plate for a pantograph is characterized by being prepared by kneading, extruding and roasting a dry powder mixture and 27-35% by mass of liquid asphalt, wherein,

the dry powder mixture is prepared by fully mixing the following raw materials in percentage by mass:

10-30% of asphalt coke particles with the granularity of 0.5-0.2mm, 15-30% of asphalt coke particles with the granularity of 0.2-0mm, 30-40% of asphalt coke powder, 5-20% of graphite powder and 5-10% of carbon black.

2. The high-strength wear-resistant carbon sliding plate for the pantograph of claim 1, wherein the dry powder mixture is prepared by fully mixing the following raw materials in percentage by mass:

25% of asphalt coke particles with the granularity of 0.5-0.2mm, 20% of asphalt coke particles with the granularity of 0.2-0mm, 30% of asphalt coke powder, 20% of graphite powder and 5% of carbon black.

3. The high-strength wear-resistant carbon skateboard for pantographs according to claim 2, characterized in that the liquid pitch accounts for 27% ± 2% of the mass of the dry powder mixture.

4. The high-strength wear-resistant carbon sliding plate for the pantograph of claim 1, wherein the dry powder mixture is prepared by fully mixing the following raw materials in percentage by mass:

25% of asphalt coke particles with the granularity of 0.5-0.2mm, 25% of asphalt coke particles with the granularity of 0.2-0mm, 33% of asphalt coke powder, 10% of graphite powder and 7% of carbon black.

5. The high-strength wear-resistant carbon skateboard for pantographs according to claim 4, wherein the liquid pitch accounts for 30% ± 2% of the mass of the dry powder mixture.

6. The method for manufacturing a high-strength wear-resistant carbon sliding plate for a pantograph according to any one of claims 1 to 5, comprising the steps of:

s1, mixing the materials according to the dosage proportion of the dry powder mixture, heating the mixture to 150 +/-5 ℃ by a double-shaft Z-shaped kneader, uniformly stirring the mixture, dry-mixing the mixture for 40 +/-5 minutes, adding liquid asphalt with the corresponding dosage proportion, and kneading the mixture for 35 +/-5 minutes to obtain paste;

s2, adding the paste material into an extrusion molding machine for pre-pressing and extruding after the paste material is cooled to 130 +/-5 ℃ to obtain a molded green body;

s3, placing the green body into a roasting furnace, roasting according to a roasting temperature rise curve of first short, medium slow and later high, cooling to 1250 +/-20 ℃ to obtain a roasted product, soaking under high pressure, and roasting for the second time to obtain a finished product.

7. The method as claimed in claim 6, wherein the pre-pressing pressure of the pre-pressing extrusion process in the step S2 is 150Kg/cm²The extrusion pressure is 160-180Kg/cm²。

8. The method according to claim 6, wherein the firing temperature increase curve in step S3 is: when the roasting temperature is below 300 ℃, the temperature is increased by 10-20 ℃ per 8 hours; when the roasting temperature is 300-600 ℃, the temperature is increased by 5-10 ℃ every 8 hours; when the roasting temperature reaches 600 ℃, the temperature is raised by 20-30 ℃ per 8 hours until the roasting temperature reaches 1250 ℃.

9. The method according to claim 6, wherein the pressure of the high pressure impregnation in the step S3 is 13 + 2Kg/cm²Using softening point 9 in the impregnationImpregnating pitch at medium temperature of 0 plus or minus 5 ℃.

10. The preparation method according to claim 6, wherein the roasting temperature rise curve of the secondary roasting in the step S3 is as follows: when the roasting temperature is below 500 ℃, the temperature is increased by 10-20 ℃ per 8 hours; the temperature is raised to 30-50 ℃ per 8 hours when the roasting temperature is 500-800 ℃, and is raised to 50 ℃ per 8 hours when the roasting temperature reaches 800 ℃ until the temperature reaches 1000 ℃, and the temperature is preserved for 70-100 hours, and then the temperature is naturally reduced and cooled.

Technical Field

The invention relates to the technical field of carbon sliding plates of pantograph, in particular to a high-strength wear-resistant carbon sliding plate for a pantograph and a preparation method thereof.

Background

At present, with the rapid development in the field of high-speed rails, the carbon material of the pantograph carbon slide plate required by the power supply connection of the power source of a high-speed rail power set is indispensable, at present, all domestic pure carbon slide plates are imported, and the carbon slide plate of the pantograph has special application fields, so that the requirements on the strength, hardness and resistance of the material are very strict, and the carbon slide plate of the pantograph, which has high strength and wear resistance, has good strength, hardness, conductivity and shock resistance and has the effects of corrosion resistance and high temperature resistance.

The carbon pantograph sliding plate used at present in China has certain strength and hardness, but has poor shock resistance, high porosity, wear resistance and high loss in the using process. The indexes of strength, hardness and resistance are not optimal, and potential safety hazards and consumption cost increase exist in the using process.

Disclosure of Invention

In view of the above problems in the prior art, the present invention provides a high-strength wear-resistant carbon sliding plate for a pantograph, which improves product quality through improvement of material processes.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a high-strength wear-resistant carbon sliding plate for a pantograph is prepared by kneading, extruding and roasting a dry powder mixture and 27-35% by mass of liquid asphalt, wherein,

the dry powder mixture is prepared by fully mixing the following raw materials in percentage by mass:

10-30% of asphalt coke particles with the granularity of 0.5-0.2mm, 15-30% of asphalt coke particles with the granularity of 0.2-0mm, 30-40% of asphalt coke powder, 5-20% of graphite powder and 5-10% of carbon black.

Specifically, the dry powder mixture is prepared by fully mixing the following raw materials in percentage by mass:

25% of asphalt coke particles with the granularity of 0.5-0.2mm, 20% of asphalt coke particles with the granularity of 0.2-0mm, 30% of asphalt coke powder, 20% of graphite powder and 5% of carbon black.

Specifically, the liquid asphalt accounts for 27% +/-2% of the mass of the dry powder mixture.

Specifically, the dry powder mixture is prepared by fully mixing the following raw materials in percentage by mass:

25% of asphalt coke particles with the granularity of 0.5-0.2mm, 25% of asphalt coke particles with the granularity of 0.2-0mm, 33% of asphalt coke powder, 10% of graphite powder and 7% of carbon black.

Specifically, the liquid asphalt accounts for 30% +/-2% of the mass of the dry powder mixture.

Further, the preparation method of the high-strength wear-resistant carbon sliding plate for the pantograph comprises the following steps:

s1, mixing the materials according to the dosage proportion of the dry powder mixture, heating the mixture to 150 +/-5 ℃ by a double-shaft Z-shaped kneader, uniformly stirring the mixture, dry-mixing the mixture for 40 +/-5 minutes, adding liquid asphalt with the corresponding dosage proportion, and kneading the mixture for 35 +/-5 minutes to obtain paste;

s2, adding the paste material into an extrusion molding machine for pre-pressing and extruding after the paste material is cooled to 130 +/-5 ℃ to obtain a molded green body;

s3, placing the green body into a roasting furnace, roasting according to a roasting temperature rise curve of first short, medium slow and later high, cooling to 1250 +/-20 ℃ to obtain a roasted product, soaking under high pressure, and roasting for the second time to obtain a finished product.

Wherein the prepressing pressure of the prepressing extrusion procedure in the step S2 is 150Kg/cm²The extrusion pressure is 160-180Kg/cm²。

The baking temperature rise curve in the step S3 is: when the roasting temperature is below 300 ℃, the temperature is increased by 10-20 ℃ per 8 hours; when the roasting temperature is 300-600 ℃, the temperature is increased by 5-10 ℃ every 8 hours; when the roasting temperature reaches 600 ℃, the temperature is raised by 20-30 ℃ per 8 hours until the roasting temperature reaches 1250 ℃.

The pressure of the high-pressure impregnation in the step S3 is 13 plus or minus 2Kg/cm²In the impregnation, medium-temperature impregnation pitch with a softening point of 90 +/-5 ℃ is used.

The roasting temperature rise curve of the secondary roasting in the step S3 is as follows: when the roasting temperature is below 500 ℃, the temperature is increased by 10-20 ℃ per 8 hours; the temperature is raised to 30-50 ℃ per 8 hours when the roasting temperature is 500-800 ℃, and is raised to 50 ℃ per 8 hours when the roasting temperature reaches 800 ℃ until the temperature reaches 1000 ℃, and the temperature is preserved for 70-100 hours, and then the temperature is naturally reduced and cooled.

Compared with the prior art, the invention has the following beneficial effects:

the invention comprehensively considers the product performance requirements, reasonably configures the raw materials of various particle sizes, and improves the product performance from the aspect of raw material proportion; the stirring and kneading speed is accelerated on the basis of uniform mixing of the raw materials, and the internal structural state of the product is improved on the basis of strictly controlling the kneading temperature; the product compactness is uniform through prepressing in the extrusion forming process, the product density is increased, and the problem of internal cracking and layering is reduced; through the design of the roasting temperature rise curve, the roasting deformation cracks and the configuration of the filler are reduced, the sand sticking of the product is avoided, and the yield is improved, so that the structural performance of the carbon pantograph slide plate is integrally improved, and various physical and chemical indexes of the carbon pantograph slide plate reach the domestic advanced level. The invention has the advantages of ingenious design, simple structure and convenient use, and is suitable for being applied to the production of carbon products.

Detailed Description

The present invention is further illustrated by the following examples, which include, but are not limited to, the following examples.