Antioxidation graphite sealing ring

A graphite sealing and anti-oxidation technology, which is applied in the field of solar thermal utilization, can solve the problems that graphite sealing rings cannot meet the use requirements and application restrictions, and achieve the effects of retaining self-lubricating performance, improving grinding efficiency, and improving wear resistance

Inactive Publication Date: 2016-11-23
JOIN GREEN ENERGY TECH TIANJIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite materials are widely used in aviation, nuclear energy and industrial fields. However, graphite materials begin to oxidize in an oxidizing environment above 500°C, which greatly limits their application. The existing graphite sealing rings can no longer meet the needs of use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An oxidation-resistant graphite sealing ring is prepared according to the following steps:

[0023] (1) Weigh each component according to the mass parts: 15 parts of silicon powder, 8 parts of boron carbide, 65 parts of asphalt, 8 parts of graphite, and 5 parts of tetrahydrofuran;

[0024] (2) Mix and stir the graphite, silicon powder, boron carbide and asphalt weighed in step (1), add tetrahydrofuran, and then quickly add it to the ball mill tank for ball milling for 50 hours. After the ball milling, vacuum distillation treatment, vacuum distillation After the treatment is completed, the mixture is added to the mold, heat-treated at 2000°C and pressed into a tube, and the tube is impregnated with polycarbosilane under high pressure at a pressure of 0.8MPa, and then pressurized and roasted to shape. After the shape is completed, it is cut into rings and polished.

Embodiment 2

[0026] An oxidation-resistant graphite sealing ring is prepared according to the following steps:

[0027] (1) Weigh each component according to the mass parts: 12 parts of silicon powder, 5 parts of boron carbide, 70 parts of asphalt, 5 parts of graphite, and 3 parts of tetrahydrofuran;

[0028] (2) Mix and stir the graphite, silicon powder, boron carbide and asphalt weighed in step (1), add tetrahydrofuran, and then quickly add it to the ball mill tank for ball milling for 50 hours. After the ball milling, vacuum distillation treatment, vacuum distillation After the treatment is completed, the mixture is added to the mold, heat-treated at 2000°C and pressed into a tube, and the tube is impregnated with a high-pressure polymer impregnating agent at a pressure of 0.8 MPa, and then pressurized and roasted to shape. After the shape is completed, it is cut into rings and polished. .

Embodiment 3

[0030] An oxidation-resistant graphite sealing ring is prepared according to the following steps:

[0031] (1) Weigh each component according to the mass parts: 8 parts of silicon powder, 10 parts of boron carbide, 68 parts of asphalt, 12 parts of graphite, 2 parts of tetrahydrofuran;

[0032] (2) Mix and stir the graphite, silicon powder, boron carbide and asphalt weighed in step (1), add tetrahydrofuran, and then quickly add it to the ball mill tank for ball milling for 50 hours. After the ball milling, vacuum distillation treatment, vacuum distillation After the treatment is completed, the mixture is added to the mold, heat-treated at 2000°C and pressed into a tube, and the tube is impregnated with a high-pressure polymer impregnating agent at a pressure of 0.8 MPa, and then pressurized and roasted to shape. After the shape is completed, it is cut into rings and polished. .

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Abstract

The invention belongs to the technical field of solar energy photo-thermal utilization, and particularly relates to an antioxidation graphite sealing ring. The sealing ring is characterized by being prepared from, by mass, 5-15 parts of silica powder, 5-15 parts of boron carbide, 65-70 parts of pitch, 5-15 parts of graphite and 1-5 parts of tetrahydrofuran. After graphite, silica powder, boron carbide and pitch are mixed, tetrahydrofuran is used as a dispersing agent, the mixture is subjected to ball milling and dispersed and then is added into a mold, pressed and roasted to form a pipe shape, high-pressure dipping and pressurized roasted molding are carried out, and the mold pipe is cut into a ring after molding is finished, polished and ground. The product has the advantages of being high in antioxidation, high in strength, resistant to abrasion and thermal expansion and good in sealing performance.

Description

technical field [0001] The invention belongs to the technical field of solar light and heat utilization, and in particular relates to an oxidation-resistant graphite sealing ring. Background technique [0002] With fossil fuels decreasing day by day, solar energy has become an important part of the energy used by human beings and has been continuously developed. There are two ways to use solar energy: photothermal conversion and photoelectric conversion. Solar power is a new type of renewable energy. Solar energy has the advantages of large resources, wide distribution range, clean and pollution-free, and reliable technology. Solar power generation technology has increasingly become the focus of the development of renewable energy technology in my country and even in the world. my country is rich in solar energy resources, and more than 2 / 3 of the country's total area has an annual sunshine time of more than 2,000 hours. The annual theoretical reserves of solar energy reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/524
Inventor 邱凤华晏强任科文
Owner JOIN GREEN ENERGY TECH TIANJIN CO LTD
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