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Self-consolidation forming method of natural graphite

A natural graphite, solidification and forming technology, applied in ceramic forming machines, supply devices, manufacturing tools and other directions, can solve the problems of harsh conditions of graphite hot-pressing forming method, easy cracking and high cost in cold forming method, and achieve the reduction of preparation cost, High toughness and uniform material effect

Inactive Publication Date: 2010-07-14
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the existing graphite hot-press forming method is harsh, the shape and size of the product are controlled by the size of the hot-press furnace, secondary cutting is required, the cost is high, and the cold forming method is prone to cracks and low toughness. problems, while providing a method for self-solidification of natural graphite

Method used

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  • Self-consolidation forming method of natural graphite

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specific Embodiment approach 1

[0009] Specific embodiment one: the method for the self-solidification molding of natural graphite of the present embodiment, carry out according to the following steps: one, according to the size of graphite workpiece and the plastic mold that design processing feed port can be sealed; Two, be natural graphite by mass ratio: Silica sol: phenol: formaldehyde with a mass concentration of 35% to 37%: sodium carbonate: water = 50 to 70: 4 to 7: 8 to 12: 14 to 20: 4 to 7: 8 to 20, and natural graphite, silicon Sol, phenol, formaldehyde, sodium carbonate and water with a mass concentration of 35% to 37% are mixed evenly, poured into the mold prepared in step 1, and the feeding port is closed; 3. Put the mold treated in step 2 at a temperature of 50 ℃~75℃ in a constant temperature box for 1.5h~2.5h, and then remove the mold to obtain a solidified graphite piece; 4. Put the solidified graphite piece obtained in step 3 into the graphitization furnace, under the protection of nitrogen ...

specific Embodiment approach 2

[0011] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the sealing process described in step 5 is carried out according to the following steps: a. Put the carbonized graphite parts into an incubator with a temperature of 150° C. to 160° C. Keep it inside for 2h~4h; b. Submerge the graphite piece treated in step a in a high-pressure impregnation kettle equipped with medium-temperature pitch, and keep it for 2h~4h under the conditions of temperature 150°C~180°C and pressure 2MPa~5MPa; c. Place the graphite parts treated in step b in the greenhouse for 24h to 48h; d. Put the graphite parts treated in step c into the graphitization furnace, under nitrogen protection, at a temperature of 2°C / min to 5°C / min Raise the temperature to 900°C-1100°C and keep it for 1.5h-2.5h; e. When cooling the graphite parts treated in step d to 150°C-180°C, immerse them in a high-pressure impregnation tank equipped with medium-temperature asphalt. 150 ℃ ...

specific Embodiment approach 3

[0012] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the sealing process described in step five is carried out according to the following steps: a, put the carbonized graphite parts in the incubator with a temperature of 155°C Keep it for 3 hours; b. Submerge the graphite parts treated in step a in a high-pressure impregnation kettle equipped with medium-temperature pitch, and keep it for 3 hours at a temperature of 160 ° C and a pressure of 3 MPa; c. Put the graphite parts treated in step b Place it in the greenhouse for 36 hours; d, put the graphite parts treated in step c into the graphitization furnace, and under the protection of nitrogen, raise the temperature to 1000 °C at a rate of 4 °C / min and keep it for 2 hours; e, put the graphite parts treated in step d When the temperature of the graphite parts is lowered to 170°C, immerse them in a high-pressure impregnation kettle filled with medium-temperature asphalt, ...

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Abstract

The invention provides a self-consolidation forming method of natural graphite, relating to the method of graphite forming. The invention solves the following problems: the existing hot-press forming method of graphite has harsh conditions, the shape and the size of the product are controlled by the size of the hot-pressing furnace, secondary cutting is required, the cost is high, and cracks are easily generated and the tenacity is low in the cold-forming method of graphite. The method comprises the following steps: designing and processing a plastic mould according to the appearance and the size of the graphite workpiece, mixing the natural graphite, silica sol, phenol, formaldehyde, sodium carbonate and water, then adding the mixture into the mould and sealing the charging hole, and obtaining the graphite workpiece after solidifying, carbonizing and hole sealing. In the method, the natural graphite undergoes one-step forming in the polymer solution under normal pressure, the condition is mild, the size and the shape of the formed graphite workpiece are controlled by the size of the plastic mould and the cost is low; and the bending strength of the graphite workpiece is 26-30MPa and the porosity is 1-5%, and the graphite workpiece has no cracks. The invention can be used in such fields as the nuclear industry, the aviation industry and the general industry.

Description

[0001] technical field [0002] The present invention relates to a method of forming graphite. Background technique [0003] Natural graphite is one of the rare non-metallic mineral materials, which has good electrical conductivity, thermal conductivity, lubrication, fire resistance and chemical stability. Due to the special properties mentioned above, graphite is widely used in metallurgy, machinery, petroleum, chemical industry, nuclear industry, national defense and other fields. Its main uses are roughly divided into the following six categories: 1. Refractory materials: In the smelting industry, graphite is used to manufacture graphite crucibles, as protective agents for steel ingots, and as magnesia-carbon bricks for the lining of smelting furnaces; 2. Conductive materials: in electrical appliances In the industry, graphite is widely used as electrodes, brushes, electric rods, carbon tubes, and coatings for TV picture tubes; 3. Wear-resistant materials and lubricants:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/14B28B13/02
Inventor 赵国刚张海军
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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