Method for preparing chopped carbon fiber reinforced carbon/carbon composite materials for pantograph slide plates

Abstract

The invention discloses a method for preparing chopped carbon fiber reinforced carbon / carbon composite materials for pantograph slide plates. The method includes placing chopped carbon fibers, mesophase asphalt powder and dispersing agents in water to obtain slurry; pouring the slurry into a metal container and carrying out freeze drying on the slurry in freeze drying equipment to obtain carbon fiber reinforcement; carrying out compression molding on the prepared carbon fiber reinforcement to obtain blanks; carrying out carbonization treatment on the prepared blanks; impregnating materials obtained after carbonization treatment is carried out in mesophase asphalt; carrying out carbonization treatment on materials obtained after materials are impregnated in the mesophase asphalt; repeatedly carrying out impregnation-carbonization by 4-6 times; carrying out graphitization treatment to obtain the target materials. The method has the advantages that the chopped carbon fiber reinforced carbon / carbon composite materials prepared by the aid of the method are excellent in electric conductivity and impact resistance, and the shortcoming of poor electric conductivity and impact resistance of existing pantograph slide plates made of carbon / carbon composite materials prepared in the prior art can be overcome.

Description

technical field

[0001] The invention belongs to the field of preparation of pantograph slides, and in particular relates to a preparation method of chopped carbon fiber reinforced carbon / carbon composite materials for pantograph slides. Background technique

[0002] As of September 2016, my country's railway business history has exceeded 120,000 kilometers, of which high-speed railways have exceeded 20,000 kilometers, achieving the goal of the country's "China's Long-term Railway Network Planning" ahead of schedule. Along with the raising of the speed of the train galloping on the high-speed railway, correspondingly also brought numerous scientific and technical problems. The pantograph sliding plate of the high-speed train is in sliding contact with the catenary wire, and the load current of about 500A is transmitted to the train, which puts forward more and more stringent requirements on the performance of the sliding plate material. At present, the commonly used material...

Examples

Embodiment 1

[0030] A method for preparing a chopped carbon fiber reinforced carbon / carbon composite material for a pantograph sliding plate, the steps are as follows:

[0031] (1) Put chopped mesophase pitch-based carbon fiber (1mm in length), mesophase pitch powder (particle size: 100 mesh) and dispersant into water to make a slurry; among them, chopped carbon fiber and mesophase pitch powder account for 50wt% of the water quality, the mass ratio of the chopped carbon fiber and the mesophase pitch powder is 7:3, the dispersant accounts for 1.5wt% of the water quality; the dispersant is polyacrylamide;

[0032] (2) Pour the slurry prepared in step (1) into a metal container, put it into a freeze dryer, freeze to -30°C under vacuum, and keep it warm for 30 minutes; continue to heat up to -20°C at a heating rate of 5°C / h , keep warm for 30 minutes; then continue to heat up to -5°C at a heating rate of 5°C / h, and keep warm for 30 minutes; then continue to heat up to -1°C at a heating rate of...

Embodiment 2

[0041] A method for preparing a chopped carbon fiber reinforced carbon / carbon composite material for a pantograph sliding plate, the steps are as follows:

[0042](1) Put chopped mesophase pitch-based carbon fibers (length: 25 mm), mesophase pitch powder (particle size: 250 mesh) and dispersant into water to make a slurry; among them, chopped carbon fibers and mesophase pitch powder account for 50wt% of the water quality, the mass ratio of the chopped carbon fiber and the mesophase pitch powder is 5:5, the dispersant accounts for 1.5wt% of the water quality; the dispersant is sodium polyacrylate;

[0043] (2) Pour the slurry prepared in step (1) into a metal container, put it into a freeze dryer, freeze to -40°C under vacuum, and keep it warm for 30 minutes; continue to heat up to -20°C at a heating rate of 5°C / h , keep warm for 30 minutes; then continue to heat up to -5°C at a heating rate of 5°C / h, and keep warm for 30 minutes; then continue to heat up to -1°C at a heating r...

Embodiment 3

[0052] A method for preparing a chopped carbon fiber reinforced carbon / carbon composite material for a pantograph sliding plate, the steps are as follows:

[0053] (1) Put chopped mesophase pitch-based carbon fiber (50 mm in length), mesophase pitch powder (500 mesh in particle size) and dispersant into water to make a slurry; among them, chopped carbon fiber and mesophase pitch powder account for 50wt% of the water quality, the mass ratio of the chopped carbon fiber and the mesophase pitch powder is 3:7, the dispersant accounts for 1.5wt% of the water quality; the dispersant is hydroxyethyl cellulose;

[0054] (2) Pour the slurry prepared in step (1) into a metal container, put it into a freeze dryer, freeze to -50°C under vacuum, and keep it warm for 30 minutes; continue to heat up to -20°C at a heating rate of 5°C / h , keep warm for 30 minutes; then continue to heat up to -5°C at a heating rate of 5°C / h, and keep warm for 30 minutes; then continue to heat up to -1°C at a hea...

technical field

[0001] The invention belongs to the field of preparation of pantograph slides, and in particular relates to a preparation method of chopped carbon fiber reinforced carbon / carbon composite materials for pantograph slides. Background technique

[0002] As of September 2016, my country's railway business history has exceeded 120,000 kilometers, of which high-speed railways have exceeded 20,000 kilometers, achieving the goal of the country's "China's Long-term Railway Network Planning" ahead of schedule. Along with the raising of the speed of the train galloping on the high-speed railway, correspondingly also brought numerous scientific and technical problems. The pantograph sliding plate of the high-speed train is in sliding contact with the catenary wire, and the load current of about 500A is transmitted to the train, which puts forward more and more stringent requirements on the performance of the sliding plate material. At present, the commonly used material...

Examples

Embodiment 1

[0030] A method for preparing a chopped carbon fiber reinforced carbon / carbon composite material for a pantograph sliding plate, the steps are as follows:

[0031] (1) Put chopped mesophase pitch-based carbon fiber (1mm in length), mesophase pitch powder (particle size: 100 mesh) and dispersant into water to make a slurry; among them, chopped carbon fiber and mesophase pitch powder account for 50wt% of the water quality, the mass ratio of the chopped carbon fiber and the mesophase pitch powder is 7:3, the dispersant accounts for 1.5wt% of the water quality; the dispersant is polyacrylamide;

[0032] (2) Pour the slurry prepared in step (1) into a metal container, put it into a freeze dryer, freeze to -30°C under vacuum, and keep it warm for 30 minutes; continue to heat up to -20°C at a heating rate of 5°C / h , keep warm for 30 minutes; then continue to heat up to -5°C at a heating rate of 5°C / h, and keep warm for 30 minutes; then continue to heat up to -1°C at a heating rate of...

Embodiment 2

[0041] A method for preparing a chopped carbon fiber reinforced carbon / carbon composite material for a pantograph sliding plate, the steps are as follows:

[0042](1) Put chopped mesophase pitch-based carbon fibers (length: 25 mm), mesophase pitch powder (particle size: 250 mesh) and dispersant into water to make a slurry; among them, chopped carbon fibers and mesophase pitch powder account for 50wt% of the water quality, the mass ratio of the chopped carbon fiber and the mesophase pitch powder is 5:5, the dispersant accounts for 1.5wt% of the water quality; the dispersant is sodium polyacrylate;

[0043] (2) Pour the slurry prepared in step (1) into a metal container, put it into a freeze dryer, freeze to -40°C under vacuum, and keep it warm for 30 minutes; continue to heat up to -20°C at a heating rate of 5°C / h , keep warm for 30 minutes; then continue to heat up to -5°C at a heating rate of 5°C / h, and keep warm for 30 minutes; then continue to heat up to -1°C at a heating r...

Embodiment 3

[0052] A method for preparing a chopped carbon fiber reinforced carbon / carbon composite material for a pantograph sliding plate, the steps are as follows:

[0053] (1) Put chopped mesophase pitch-based carbon fiber (50 mm in length), mesophase pitch powder (500 mesh in particle size) and dispersant into water to make a slurry; among them, chopped carbon fiber and mesophase pitch powder account for 50wt% of the water quality, the mass ratio of the chopped carbon fiber and the mesophase pitch powder is 3:7, the dispersant accounts for 1.5wt% of the water quality; the dispersant is hydroxyethyl cellulose;

[0054] (2) Pour the slurry prepared in step (1) into a metal container, put it into a freeze dryer, freeze to -50°C under vacuum, and keep it warm for 30 minutes; continue to heat up to -20°C at a heating rate of 5°C / h , keep warm for 30 minutes; then continue to heat up to -5°C at a heating rate of 5°C / h, and keep warm for 30 minutes; then continue to heat up to -1°C at a hea...