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FeCoCrNiMo-based high-entropy alloy composite material as well as preparation method and application thereof

A high-entropy alloy and composite material technology is applied in the field of FeCoCrNiMo-based high-entropy alloy composite materials and their preparation, which can solve the problems of reduced material strength, poor bonding performance, and easy occurrence of a large number of micro-cracks.

Active Publication Date: 2022-03-01
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soft metallic silver has good lubricating performance at room temperature to 600°C, and the realization of lubricating performance at higher temperatures is achieved by adding high-temperature lubricating phases, such as hexagonal boron nitride, metal fluoride, etc., but metals and such inorganic The material bonding performance is poor, and a large number of micro-cracks are prone to appear inside the material, resulting in a decrease in the strength of the material

Method used

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  • FeCoCrNiMo-based high-entropy alloy composite material as well as preparation method and application thereof
  • FeCoCrNiMo-based high-entropy alloy composite material as well as preparation method and application thereof
  • FeCoCrNiMo-based high-entropy alloy composite material as well as preparation method and application thereof

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preparation example Construction

[0024] The present invention provides a method for preparing an FECOCRNIMO-based high entropy alloy composite, including the following steps:

[0025] FECOCRNIMO high entropy alloy powder, Ti powder, Al powder and Ag powder were mixed, and the resulting mixture was subjected to discharge plasma sintering, solid solution and aging treatment to obtain FECOCRNIMO-based high entropy alloy composite.

[0026] In the present invention, if there is no special description, the required materials are commercially available goods well known to those skilled in the art.

[0027] In the present invention, the particle size of the FECRNIMO high entropy alloy powder is preferably 65 to 100 μm; the particle size of the Ti powder is preferably 15 to 35 μm; the particle size of the Al powder is preferably 20 to 40 μm; the particle size of the Ag powder It is preferably 15 to 35 μm. The present invention has no particular limitation on the source of FECOCRNIMO high entropy alloy powder, Ti powder, ...

Embodiment 1

[0040] Add 90 FECOCRNIMO high entropy alloy powder, Ti powder 3 parts and Al powder 3 parts in 3 parts of 3 parts and AL powder. 2 O 3 In the ball mill, mixed for 20 h under the condition of rotation 300R / min; add 4 Ag powder to the resulting mixed powder, mixed with 5 h under the condition of 250 R / min; pour the mixed mixed mixture, load the graphite mold By discharging plasma sintering, under pressure of 30 MPa, the temperature is gradually warmed by room temperature to 950 ° C, 20 min, fuel to the room temperature, and the resulting composite is charged at 1 h, after air cooling, after 4 h at 850 ° C for 4 h Treatment to obtain FECOCRNIMO-based high entropy alloy composite.

Embodiment 2

[0042] According to the mass parts, 88 FeCoCrnimo high entropy alloy powder, Ti powder 4 parts and Al powder 3 parts were put in Al 2 O 3 In the ball mill, mixed for 18 h under the conditions of the rotational speed 280R / min; 5 parts of Ag powder was added to the resulting mixed powder, mixed under the condition of 200R / min, and mixed mixed mixed mixture, put graphite The mold is sintered by discharge plasma, at a pressure of 30 MPa, gradually warping from room temperature to 900 ° C, molded 15 min, fuel to the room temperature; the material prepared by discharge plasma sintering is 1 h at 1100 ° C, after air cooling, at 800 EtOAc EtOAc EtOAc EtOAc EtOAc.

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Abstract

The invention provides a FeCoCrNiMo-based high-entropy alloy composite material as well as a preparation method and application thereof, and belongs to the technical field of self-lubricating materials. Al and Ti are added into a FeCoCrNiMo matrix, solid solution treatment and aging treatment are carried out at the same time, and a second phase is separated out, so that the FeCoCrNiMo alloy matrix is strengthened, the strength of the composite material is guaranteed, and the influence of addition of soft metal Ag on the hardness of the composite material can be reduced; meanwhile, due to the fact that Ag has low shear strength, the friction coefficient of the composite material is reduced, in the high-temperature friction process, molybdenum in a composite material matrix can be oxidized to form molybdenum oxide, silver molybdate is generated in situ due to the friction chemical reaction of elemental silver and the molybdenum oxide, and the silver molybdate has an obvious lubricating effect at the high temperature (higher than 700 DEG C); the high-temperature lubricating property of the composite material at 800 DEG C is realized, and the self-lubricating composite material in a wide temperature range from room temperature to 800 DEG C is obtained.

Description

Technical field [0001] The present invention relates to the field of lubricating materials, and more particularly to a FECOCRNIMO-based high entropy alloy composite material and a preparation method thereof. Background technique [0002] Developing high-performance high temperature solid lubrication composites and technology is one of the effective means of solving friction and wear in extreme working conditions such as high temperatures to ensure a reliable and stable operation of the system. The mechanical properties of the high temperature solid lubricating material matrix are basic guarantees for achieving excellent properties of composite materials, and the addition of lubrication phase is the key to achieving self-lubricating composite materials. [0003] High entropy alloy is one of the frontier fields of alloy studies in recent years. The eutectic high entropy alloy is much attention because of its excellent mechanical properties, and the CoCrnifeMo series alloy is based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C30/00B22F3/105B22F3/24C10M125/00
CPCC22C1/04C22C30/00B22F3/105B22F3/24C10M125/00B22F2003/1051B22F2003/248C10M2201/08C10N2030/06
Inventor 杨蕊王廷梅王齐华杨丽君谢海许雪飞
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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