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A silicon carbide-based high-temperature self-lubricating composite material and its preparation method

A high-temperature self-lubricating and composite material technology, which is applied in the field of silicon carbide-based high-temperature self-lubricating composite materials and its preparation, can solve problems such as low operating temperature, achieve stable friction coefficient, improve high-temperature anti-friction and anti-wear performance, and heat resistance Good results

Active Publication Date: 2018-10-23
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two invention patents involve very low operating temperatures, and the invention patents related to higher temperature ceramic-based high-temperature self-lubricating materials, especially silicon carbide-based high-temperature self-lubricating materials, have not yet been published.

Method used

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  • A silicon carbide-based high-temperature self-lubricating composite material and its preparation method
  • A silicon carbide-based high-temperature self-lubricating composite material and its preparation method
  • A silicon carbide-based high-temperature self-lubricating composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to the mass percentage: 10% Mo, 30% CaF 2 , 60% SiC, weigh each powder material respectively. Mix in a high-energy ball mill at a speed of 200 rpm for 8 hours to obtain a composite powder, put the composite powder into a graphite abrasive tool, and then place it in a vacuum hot-press sintering furnace for hot-press sintering. The sintering parameters are: heating rate 15°C / min, furnace chamber vacuum 10 -2 ~10 -1 Pa, the sintering temperature is 1300°C, the applied pressure is 30 MPa, and the holding time is 20 min. After sintering, the material is cooled to room temperature with the furnace and taken out.

[0020] The material has a room temperature hardness of 7.31 GPa and a density of 3.99 g / cm 3 . The average coefficient of friction at room temperature is 0.24, and the wear rate is 2.05 × 10 -6 mm 3 / Nm; the average friction coefficient at 800°C is 0.46, and the wear rate is 9.87 × 10 -6 mm 3 / Nm; the average friction coefficient at 1000°C is 0...

Embodiment 2

[0022] According to the mass percentage: 25%Mo, 25%CaF 2 , 50% SiC, weigh each powder material respectively. Mix for 6 hours at a speed of 300 rpm in a high-energy ball mill to obtain a composite powder, put the composite powder into a graphite abrasive tool, and then place it in a vacuum hot-press sintering furnace for hot-press sintering. The sintering parameters are: heating rate 15°C / min, furnace chamber vacuum 10 -2 ~10 -1 Pa, the sintering temperature is 1300°C, the applied pressure is 30 MPa, and the holding time is 20 min. After sintering, the material is cooled to room temperature with the furnace and taken out.

[0023] The material has a room temperature hardness of 7.12 GPa and a density of 4.39 g / cm 3 . The average coefficient of friction at room temperature is 0.28, and the wear rate is 2.35 × 10 -6 mm 3 / Nm; the average coefficient of friction at 800°C is 0.29, and the wear rate is 7.90 × 10 -6 mm 3 / Nm; the average coefficient of friction at 1000°C ...

Embodiment 3

[0025] According to the mass percentage: 30%Mo, 20%CaF 2 , 50% SiC, weigh each powder material respectively. Mix for 4 hours at a speed of 300 rpm in a high-energy ball mill to obtain a composite powder. Put the composite powder into a graphite abrasive tool, and then place it in a vacuum hot-press sintering furnace for hot-press sintering. The sintering parameters are: heating rate 20°C / min, furnace chamber vacuum 10 -2 ~10 -1 Pa, the sintering temperature is 1200°C, the applied pressure is 20 MPa, and the holding time is 30 min. After sintering, the material is cooled to room temperature with the furnace and taken out.

[0026] The material has a room temperature hardness of 6.23 GPa and a density of 4.35 g / cm 3 . The average coefficient of friction at room temperature is 0.32, and the wear rate is 2.28 × 10 -6 mm 3 / Nm; the average coefficient of friction at 800°C is 0.25, and the wear rate is 6.88 × 10 -6 mm 3 / Nm; the average friction coefficient at 1000°C is ...

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Abstract

The invention discloses a silicon carbide base high-temperature self-lubricating composite material. The composite material comprises, by mass percent, 10%-40% of Mo, 10%-30% of CaF2 and 30%-80% of silicon carbide. The invention further discloses a preparation method of the composite material. The composite material has characteristics of a low friction coefficient and a low abrasion rate at the room temperature or at the temperature of 800 DEG C or the temperature of 1,000 DEG C, is suitable for manufacturing bearings, mechanical seals and other high-temperature mechanism lubricating components used within the range from the low temperature to the temperature of 1,000 DEG C and has wide application prospects in the field of aviation, spaceflight, nuclear energy, metallurgy, machinery and other fields.

Description

technical field [0001] The invention discloses a silicon carbide-based high-temperature self-lubricating composite material and a preparation method thereof. The material has high density and good high-temperature lubrication performance, and has good application prospects as a self-lubricating material in harsh environments such as high temperature, high load, and oil-free. Background technique [0002] The tribological properties of precision basic components such as rotary seals and high-temperature bearings in industrial equipment such as aero-engines, nuclear power equipment, and gas turbines that serve under extreme working conditions are directly related to the reliability, stability, durability, and energy efficiency of mechanical equipment. , lubricating materials are the bottleneck restricting the development of these technical equipment. Conventional lubricating oil, grease and traditional solid lubricating micropowder are difficult to meet the comprehensive requ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/00C22C29/02C22C1/05B22F3/14
CPCB22F3/14B22F2998/10C22C1/051C22C29/00C22C29/02B22F2009/043
Inventor 杨军刘维民李斐李茂华朱圣宇鹿毅杨博程军
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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