Antimony impregnated graphite is an excellent self-lubricating and anti-wear material. It can be used at high temperature of 500 ° C, cryogenic temperature of - 253 ° C, high speed of 20000 rpm, high pressure of 10MPa, or high viscosity. It is especially suitable for working conditions of water, oil, kerosene and other media.
Antimony metal is insoluble in water, hydrochloric acid and concentrated alkali solution. Antimony rarely dissolves when it rubs with steel with increased load and speed. Therefore, antimony impregnated graphite materials are also suitable for water, hydrochloric acid, concentrated alkali and other media. The materials of antimony impregnated graphite may be silicon carbide, tungsten carbide or stainless steel.
Application examples:
1. Application of m120d antimony impregnated graphite in propane pump.
The rotor of 150YZC magnetic drive propane booster pump developed by Lanzhou Petroleum Refining and chemical works is fully enclosed, and its bearings cannot be lubricated with lubricating fluid. M120d antimony impregnated graphite is used as the bearing, which realizes the purpose of no lubricating fluid and good wear resistance, and meets the special requirements of magnetic drive pump.
Note: bearing size Ф 96/ Ф seventy-five × 80mm counter grinding pair: Ni60
2. Application of m120d in mechanical seal of welded metal bellows.
Since 1986, Shanghai water pump plant has imported the manufacturing technology of this kind of seal from American companies, and has been using m120d antimony impregnated graphite to produce this kind of seal. It provides domestic matching seals for HPH hot water circulating pump of the plant, low-temperature liquid hydrocarbon pump of the Ministry of space, and seals in imported petrochemical units.
Note: its specification is Ф 25~ Ф 100mm。
3. Application in compressor.
M50.6/35 ~ 5/24 ~ 49 air nitrogen hydrogen combined compressor and 20m3 / min oxygen compressor (large injection molding machine) produced by Sichuan Jianyang Huaxi General Machinery Co., Ltd. are respectively impregnated with m254d antimony graphite. It can be used not only for low-pressure 5MPa compressor, but also for packing choke ring and guide ring at high-pressure 15MPa.
Note: the medium is air, nitrogen, natural gas, hydrogen sulfide gas, etc.
Graphite ring specification: Ф 100/ Ф seventy × ten Ф 75/ Ф fifty × 8mm。
Counter grinding pair: 38crmoa1.
4. Application in plastic industry.
The sealing moving ring of NHL superheated water circulation pump (Germany nhl50 / 210) and NKL pump of Fujian Sanming plastic factory used to be made of resin impregnated graphite material, which is not wear-resistant. The longest life is one month, and the shortest is only a dozen days. Later, 1790 was used. After half a year of operation, the wear was less than 0.01 mm, which met the use requirements. In addition, satisfactory results have been achieved by replacing the graphite ring with antimony impregnated graphite edge in the rotary joint of the roller Jane on imported equipment.
Note: Specification Ф 42/ Ф thirty-one × 13， Ф 48/ Ф twenty-nine × 22mm
Grinding pair: silicon carbide, with a service life of more than half a year.
5. Application in paper industry.
The sealing ring of the air head of the drying cylinder of the 2040 and 3300 paper machines of Sichuan Yibin Paper Mill requires good wear resistance and long service life. Graphite sealing can be used for several years in the imported equipment. In order to solve the localization of such imported equipment, m120d was tested on 3300 paper machine. After more than two years of operation and evaluation, it was proved that the use effect was good and met the use requirements.
Note: Specification（ Ф 135~ Ф 180） × 20mm.
Counter grinding: hard chromium plating on spherical surface # 45 # steel
6. Application in hot oil circulation pump.
The bearing of kb02a-200 hot oil circulating pump developed by Hunan Shaoyang No. M179d antimony impregnated graphite bearing has passed the 100 hour test and the wear is no more than 0.01mm, meeting the design requirements, and can be officially used in this new product.
Note: medium: high temperature heat transfer oil. Acid value: 0.5mg KOH / 8
Temperature: 260 ~ 300 ° C
Graphite bearing specification: Ф 55/ Ф forty-five × 40mm, externally installed Ф 60mm bearing sleeve.
For grinding pair, 40Cr quenching hardness RC: 40-45, service life more than 10000 hours.
7. Application in non-woven hot rolling mill.
Chengdu non-woven fabric factory has a hot rolling mill made in Taiwan, which is the key equipment for producing non-woven fabrics and sanitary napkins. Metal ball bearings have been used in the past. Therefore, under the condition of high temperature of 300 ° C, the general grease loses its lubricating effect, and the bearing cannot be lubricated, so it is easy to be damaged, and it can only be operated for one week. In June 1993, antimony impregnated graphite bearings were used to replace ball bearings. After two months of testing, little wear was measured and almost no wear value was measured. It is estimated that they can be used for more than one year.
Note: temperature 270 ~ 300 ° C, speed 30 rpm
Specifications Ф 180/ Ф one hundred and ten × 60mm.
8. Use on coal mill.
The large coal mill produced by Beijing Electric Power Equipment Co., Ltd. is a complete set for Dalate Banner power station in Inner Mongolia. The sealed medium is the primary hot air of MPS coal mill, including soot, water vapor condensate and coarse and fine pulverized coal. The sealed medium pressure is 10KPA, the medium temperature is 500 ° C, the rotating shaft diameter is 1900mm, the surface roughness is ra = 3.2, the material is ductile iron qt42-10, the rotating speed is 24.1 rpm, and the linear speed is 2.4m/s. The air flow velocity is 38.8m/s.
M170d antimony impregnated graphite ring has an inner diameter of 1900mm and a thickness of 12mm. Each ring is composed of 20 segments, with a small gap between each segment. A set of devices has 4 cycles in total. It is required that the service life of the graphite ring shall not be less than 10000 hours under the working conditions, and the product performance shall be close to the German E10K level.
The annual output value of East Carbon 95 reached more than 600000.
In recent years, the annual output value can reach more than 1 million. Do a good job in after-sales service and win the trust of users. It is estimated that the annual total output value can reach more than 4 million.
9. Application in water medium and dry friction.
A 〉 m120d antimony impregnated graphite can be successfully used in the mechanical seal of the nuclear secondary pump of the "July 28" project. The test shows that it meets and meets the design technical requirements. The effectiveness of matching antimony impregnated graphite with silicon carbide is affirmed. This product is used in nuclear power pumps, which is the first in China and is progressiveness. At present, this graphite material is being expanded in nuclear pumps to meet the matching needs.
Note: shutdown cooling pump containment spray pump safety injection pump
Shaft diameter Ф one hundred and fifteen Ф eighty Ф eighty-five
Inner seal outer seal inner seal outer seal inner seal outer seal
Friction pair SiC WC WC WC WC
(b) use of m106d boiler feed pump.
The CHTA type boiler feed water pump of Shenyang water pump works uses mechanical seal, which is successfully impregnated with m106d antimony graphite. Through dynamic 100 hour test, the wear amount is zero, the medium water pressure is 0.2-2 pieces / mm2, the rotational speed is 5200 rpm, the linear speed is 39.6 M / s, and the temperature is 10-70 ° C. the grinding pair is silicon carbide, and the carbon used can approach my10k in the United Kingdom.
Application of ＜ C ＞ m120d in polyester plant
In the past, the seals used on the steam inlet head of the post spinning workshop of the polyester plant of Tianjin Petrochemical General Factory used to use British my10k antimony impregnated graphite. In order to make the equipment domestic, m120d antimony impregnated graphite has been used since 1987. It has been proved by loading and running that its sealing and wear resistance have met the technical requirements specified by Dongfang carbon and can meet the actual needs of production. For more than two years, it has been used in Tianjin fiber washing plant, Heilongjiang Acheng fiber washing plant It has been popularized and used by Shanghai Petrochemical General Plant, fiber washing plant and other units, and has gradually replaced several imported ones.
Application of antimony impregnated graphite in submersible pumps.
Antimony impregnated graphite bearings have become one of the key components of submersible pumps, especially large-scale mining submersible pumps. Since 1986, East carbon impregnated antimony graphite bearings have been gradually used in various large and medium-sized submersible pumps produced by Hefei Electric Machinery Factory and Tianjin electric machinery factory. It can replace imported parts. The 1200kW (kw) and 1800kW series submersible pumps produced by Hefei Electric Machinery Factory, the other bearings and thrust bearings are matched with East Carbon m120d and m254d antimony impregnated graphite, and the electric pump won the National Gold Award in 1987.
Working conditions of graphite bearing:
Model flow m3 / N head speed rpm kw
　　550KQ 550 125—575 1470 28—1400
　　1500KQ 1500 50—300 1470 450—1600
Usage of graphite bearing:
Medium: general clean water temperature 80 ° C
Speed: 1470 RPM pressure: 2MPa
Counter grinding pair: chrome steel and stainless steel
Graphite bearing specification:
Guide bearing: Ф 150/ Ф one hundred and twenty-five × 80mm ＜ left-right rotation ＞
A set of 4 pieces (for 1200kW submersible pump)
　　 Ф 210/ Ф one hundred and seventy × 110mm ＜ left-right rotation ＞
A set of 4 pieces (for 1800kW submersible electric pump)
Thrust bearing: Ф 310/ Ф one hundred and forty × 18mm, 8-piece set (upper thrust)
　　 Ф 310/ Ф one hundred and forty × 20mm, 16 Piece Set (lower thrust)
M120d is used as the guide bearing and m254d is used as the thrust bearing. The wear of 8000 hours is not more than 0.5mm, which meets the process requirements.
(E) application of antimony impregnated graphite under dry friction conditions.
In the foundry industry, the lubrication of the bearing bush of the sand mold (core) drying pit car is a technical problem. The working environment of the pit truck is harsh, the temperature is as high as 450-550 ° C, the load is heavy, and the dust concentration is large. In the past, cast iron bearing shells could not solve the lubrication problem under high temperature, resulting in large friction resistance, unstable operation of pit trucks, and long traction distance. The steel wire was often broken, making the operation extremely unsafe, which seriously affected the production process. Many manufacturers can not find suitable high temperature resistant, self-lubricating and anti-wear materials, which affects the renovation of equipment. At the end of 1986, the East Carbon Plant cooperated with Changsha Machine Tool Foundry to try m120d antimony impregnated graphite as bearing bush on the pit car. After one year of continuous practical operation, it was shown that this graphite can fully adapt to working in harsh environments. Operating conditions:
Medium: air pressure 4MPa
Temperature: 450 ~ 500 ° C rotational speed: 8 rpm
Pair grinding: specification of 45 # steel bearing bush: Ф 125/ Ф ninety-five × 90mm
Note: steel sleeve is added for ball bearing
After one year's operation, the wear amount of antimony impregnated graphite is 1mm. According to this calculation, a bearing bush can be used for two years.