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Heat treating method of carbon graphite material

A heat treatment method and carbon-graphite technology, applied in the field of carbon-graphite composite materials, can solve the problems of poor machining performance, high blank hardness, loss of value, etc., and achieve the effects of improving strength, improving wear resistance, and reducing heat treatment temperature

Inactive Publication Date: 2009-06-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the carbonized pitch, the various components are combined into a whole blank. This kind of blank has high hardness, high brittleness, and extremely poor machining performance. If no heat treatment is performed, it cannot be processed into parts of the required size, and it is lost for engineering. material value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The formula is superfine petroleum coke: earthy graphite: wear-resistant carbon black: silicon carbide powder = 75:10:10:5, impregnated with asphalt twice, and roasted three times. The φ62×80mm carbon graphite blank is packed in 6 layers The hearth is φ300×700mm, and in the hearth of a 100kw intermediate frequency induction furnace, 15 substrates in each layer are protected with N2, raised to 900°C at 280°C / hour, then raised to 1550°C at 25°C / hour, and then heated to 250°C °C / hour, rise to 2000 °C, keep warm for 2 hours, then cool down to below 50 °C with the furnace. Swap the 1~6 layer, 2~5, 3~4 layer samples, and then process once according to the above process.

[0016] The pitch used in the present invention is medium-temperature coal tar pitch, the temperature when impregnating the pitch is 180°C, the pressure is 0.8MPa, the roasting temperature is 900°C, and the roasted product matrix with the required composition is obtained, and its density is 1.70g / cm 3 , Shor...

Embodiment 2

[0018] The difference from Example 1 is:

[0019] The formula is superfine petroleum coke: earthy graphite: wear-resistant carbon black: silicon carbide powder = 70:15:5:10, impregnated with asphalt twice, and roasted three times, the φ62×80mm carbon graphite blank is loaded in 6 layers The hearth is φ300×700mm, in the hearth of a 100 kW intermediate frequency induction furnace, 15 substrates per layer are used for N 2 Protection, at 250°C / hour, rise to 900°C, then at 40°C / hour, rise to 1600°C, then at 200°C / hour, rise to 1900°C, keep warm for 1 hour, then cool down to below 50°C with the furnace . Swap the 1~6 layer, 2~5, 3~4 layer samples, and then process once according to the above process.

[0020] The pitch used in the present invention is medium-temperature coal tar pitch, the temperature when impregnating the pitch is 170°C, the pressure is 1MPa, the roasting temperature is 950°C, and the roasted product matrix with the required composition is obtained, and its densi...

Embodiment 3

[0022] The difference from Example 1 is:

[0023] The formula is superfine petroleum coke: earthy graphite: wear-resistant carbon black: silicon carbide powder = 65:10:15:10, impregnated with asphalt twice, and roasted three times, the φ62×80mm carbon graphite blank is loaded in 6 layers The hearth is φ300×700mm, and in the hearth of a 100kW intermediate frequency induction furnace, 15 substrates in each layer are protected by Ar, at 300°C / hour, rising to 900°C, then at 50°C / hour, rising to 1650°C, and then at 300°C °C / hour, rise to 2100 °C, keep warm for 3 hours, then cool down to below 50 °C with the furnace. Swap the 1~6 layer, 2~5, 3~4 layer samples, and then process once according to the above process.

[0024] The asphalt used in the present invention is medium temperature coal tar pitch, the temperature when impregnating the asphalt is 190°C, the pressure is 0.6MPa, the roasting temperature is 850°C, and the roasted product matrix of the required composition is obtaine...

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Abstract

The invention relates to a carbon graphite composite material, in particular to a heat treatment method for the carbon graphite material. The material to be treated is roasted products, namely carbon graphite roughcast, and the formula of the carbon graphite roughcast comprises the following: the carbon graphite roughcast is prepared by taking ultrafine petroleum coke powder as a main composition, adding proper earthy graphite, abrasion-resistant carbon black and silicon carbide powder into the ultrafine petroleum coke powder, and performing kneading, profiling, asphalt leaching for two times and roasting for three times according to specified technology. After the temperature is raised to be between 850 and 950 DEG C at the speed of 250 to 300 DEG C per hour, the temperature is continuously raised to be between 1,550 and 1,650 DEG C at the speed of 20 to 50 DEG C per hour, and raised to be between 1,900 and 2,100 DEG C at the speed of 200 to 300 DEG C per hour; after the temperature is maintained for 1 to 3 hours, the carbon graphite composite material is cooled to a temperature of less than 50 DEG C along with a furnace and then discharged; and the position of a substrate in the furnace is exchanged, and the technology is repeated. The heat treatment method solves the technical problems of roughcast cracking, large brittleness and difficult processing, reduces the Shore hardness of the material to be approximately 65, and improves the density of the material from approximately 1.70 g / cm<3> to more than 1.80 g / cm<3>.

Description

technical field [0001] The invention relates to a carbon-graphite composite material, in particular to a heat treatment method for a carbon-graphite material. Background technique [0002] The superfine petroleum coke powder is selected as the main component, and then an appropriate amount of earthy graphite, wear-resistant carbon black and silicon carbide raw materials are added, and the carbon graphite blank is obtained after kneading, pressing, roasting, dipping in pitch twice, and second roasting. Among them, the microstructure of carbon components after carbonization of ultrafine petroleum coke and pitch still belongs to typical turbostratic structure, while the structure and properties of silicon carbide components have not changed significantly. Through the carbonized pitch, the various components are combined into an overall blank. This kind of blank has high hardness, high brittleness, and extremely poor machining performance. If no heat treatment is performed, it c...

Claims

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Application Information

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IPC IPC(8): C04B35/64C04B35/52
Inventor 白朔成会明徐红军巴力学程文利俎志鸿周序科罗川吴峻峰杜海峰冀金兰赵金福周金玉张海鹰牛鸿磊令狐喜欢靳登攀
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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