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High-entropy alloy self-lubricating composite material and preparation method thereof

A high-entropy alloy and composite material technology is applied in the field of high-entropy alloy-based self-lubricating composite materials and their preparation, which can solve problems such as limitations of use conditions and achieve the effects of excellent mechanical properties and good self-lubricating properties.

Active Publication Date: 2016-08-31
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

In these patents, the strength of the material is sacrificed in order to obtain good self-lubricating properties, so the use conditions are limited by the strength

Method used

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  • High-entropy alloy self-lubricating composite material and preparation method thereof
  • High-entropy alloy self-lubricating composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] One composition is CoCrFeNi-8Ag-10(Gr / MoS 2 )-5(CaF 2 / BaF 2 )-4CeO 2 The preparation steps of the high-entropy alloy-based self-lubricating composite are as follows:

[0016] (1) Weigh CoCrFeNi quaternary high-entropy alloy powder, silver powder, graphite powder, molybdenum disulfide powder, calcium fluoride powder, barium fluoride powder and cerium oxide powder respectively according to mass percentage. Among them, silver powder is 10%, the particle size is not more than 0.038mm; graphite powder is 5%, the particle size is not more than 0.044mm; molybdenum disulfide powder is 5%, the particle size is not more than 0.005mm; calcium fluoride powder is 2%, barium fluoride powder is 3% , the particle size of the two is not greater than 0.019mm; the cerium oxide is 4%, the particle size is not greater than 0.019mm; the balance is CoCrFeNi quaternary high-entropy alloy powder, the particle size is not greater than 0.076mm. All powders were greater than 99% pure. Put th...

Embodiment 2

[0023] A composition of CoCrFeNi-4Ag-6 (Gr / MoS 2 )-5(CaF 2 / BaF 2 )-6CeO 2 The preparation steps of the high-entropy alloy-based self-lubricating composite are as follows:

[0024] (1) Weigh CoCrFeNi quaternary high-entropy alloy powder, silver powder, graphite powder, molybdenum disulfide powder, calcium fluoride powder, barium fluoride powder and cerium oxide powder respectively according to mass percentage. Among them, silver powder is 4%, the particle size is not more than 0.038mm; graphite powder is 3%, the particle size is not more than 0.044mm; molybdenum disulfide powder is 3%, the particle size is not more than 0.005mm; calcium fluoride powder is 2%, barium fluoride powder is 3% , the particle size of the two is not greater than 0.019mm; the cerium oxide is 6%, the particle size is not greater than 0.019mm; the balance is CoCrFeNi quaternary high-entropy alloy powder, the particle size is not greater than 0.076mm. All powders were greater than 99% pure. Put the a...

Embodiment 3

[0031] A composition of CoCrFeNi-8Ag-6 (Gr / MoS 2 )-10(CaF 2 / BaF 2 )-8CeO 2 The preparation steps of the high-entropy alloy-based self-lubricating composite are as follows:

[0032] (1) Weigh CoCrFeNi quaternary high-entropy alloy powder, silver powder, graphite powder, molybdenum disulfide powder, calcium fluoride powder, barium fluoride powder and cerium oxide powder respectively according to mass percentage. Among them, silver powder is 8%, the particle size is not more than 0.038mm; graphite powder is 3%, the particle size is not more than 0.044mm; molybdenum disulfide powder is 3%, the particle size is not more than 0.005mm; calcium fluoride powder is 4%, barium fluoride powder is 6% , the particle size of the two is not greater than 0.019mm; the cerium oxide is 8%, the particle size is not greater than 0.019mm; the balance is CoCrFeNi quaternary high-entropy alloy powder, the particle size is not greater than 0.076mm. All powders were greater than 99% pure. Put the ...

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Abstract

The invention discloses a high-entropy alloy self-lubricating composite material. According to the high-entropy alloy self-lubricating composite material, four-element high-entropy alloy CoCrFeNi serves as a matrix, and silver, graphite, molybdenum disulfide, calcium fluoride, barium fluoride and cerium oxide serve as a lubrication phase; the silver element content is 2%-15%, the sum of the content of the graphite and the content of the molybdenum disulfide is 5%-10%, and the content of the graphite is equal to that of the molybdenum disulfide; the sum of the content of the calcium fluoride and the content of the barium fluoride is 5%-10%, and the ratio of the content of the calcium fluoride to the content of the barium fluoride is 4:6; the content of the cerium oxide is 3%-8%; the balance is the four-element high-entropy alloy CoCrFeNi; and all the contents are expressed by mass percent. The invention further discloses a preparation method of the composite material. The composite material provided by the invention has good self-lubricating performance and meanwhile has excellent strength and toughness within the wide temperature region (the room temperature to 800 DEG C).

Description

technical field [0001] The invention relates to a high-entropy alloy-based self-lubricating composite material and a preparation method thereof. Background technique [0002] Metal-based self-lubricating composite materials are widely used in mechanical parts that are difficult to lubricate with conventional grease or in mechanical equipment that serve in harsh working conditions such as high speed, heavy load, high temperature, vacuum, cryogenic, and radiation. In order to obtain a lower coefficient of friction, metal-based self-lubricating composites usually need to add more solid lubricants, but too much solid lubricants will inevitably deteriorate the mechanical properties of composites, and to obtain good self-lubricating properties must At the cost of sacrificing part of the material strength. Currently widely reported mainly nickel-based composites. Chinese patent CN103540780B discloses a preparation method of a high-strength nickel-based high-temperature self-lubri...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C32/00C22C1/05B22F9/04B22F3/105
CPCB22F3/105B22F9/04B22F2009/043C22C1/05C22C30/00C22C32/0089
Inventor 孟军虎张爱军韩杰胜苏博
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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