A fecocrnimo-based high-entropy alloy composite material and its preparation method and application

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

Active Publication Date: 2022-05-13
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A fecocrnimo-based high-entropy alloy composite material and its preparation method and application
  • A fecocrnimo-based high-entropy alloy composite material and its preparation method and application
  • A fecocrnimo-based high-entropy alloy composite material and its preparation method and application

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preparation example Construction

[0024] The invention provides a method for preparing a FeCoCrNiMo-based high-entropy alloy composite material, comprising the following steps:

[0025] FeCoCrNiMo high-entropy alloy powder, Ti powder, Al powder and Ag powder are mixed, and the obtained mixture is sequentially subjected to spark plasma sintering, solution treatment and aging treatment to obtain FeCoCrNiMo-based high-entropy alloy composite material.

[0026] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.

[0027] In the present invention, the particle size of the FeCoCrNiMo high-entropy alloy powder is preferably 65-100 μm; the particle size of the Ti powder is preferably 15-35 μm; the particle size of the Al powder is preferably 20-40 μm; the particle size of the Ag powder is Preferably it is 15-35 micrometers. In the present invention, the sources of the FeCoCrNiMo high-entropy alloy powder, ...

Embodiment 1

[0040] In parts by mass, put 90 parts of FeCoCrNiMo high-entropy alloy powder, 3 parts of Ti powder and 3 parts of Al powder into Al 2 o 3 In a ball mill, mix for 20 hours at a speed of 300r / min; add 4 parts of Ag powder to the resulting mixed powder, and mix for 5 hours at a speed of 250r / min; pour out the mixed material and put it into a graphite mold , through spark plasma sintering, under the pressure of 30MPa, the temperature is gradually raised from room temperature to 950°C, molded for 20min, and then lowered to room temperature for demoulding, and the obtained composite material is subjected to heat preservation treatment at 1000°C for 1h, and after air cooling, it is aged at 850°C for 4h treatment to obtain FeCoCrNiMo-based high-entropy alloy composites.

Embodiment 2

[0042] In parts by mass, put 88 parts of FeCoCrNiMo high-entropy alloy powder, 4 parts of Ti powder and 3 parts of Al powder into Al 2 o 3 In a ball mill tank, mix for 18 hours at a speed of 280r / min; add 5 parts of Ag powder to the resulting mixed powder, mix for 10 hours at a speed of 200r / min, pour out the mixed material, and put in graphite The mould, through spark plasma sintering, is gradually heated from room temperature to 900 ° C under a pressure of 30 MPa, molded for 15 minutes, and then lowered to room temperature for demoulding; the material prepared by spark plasma sintering is subjected to heat preservation treatment at 1100 ° C for 1 hour, and after air cooling, at 800 ℃ for 8h aging treatment to obtain FeCoCrNiMo-based high-entropy alloy composites.

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Abstract

The invention provides a FeCoCrNiMo-based high-entropy alloy composite material and its preparation method and application, belonging to the technical field of self-lubricating materials. In the present invention, Al and Ti are added to the FeCoCrNiMo matrix, solid solution and aging treatment are carried out at the same time, and the second phase is precipitated, so that the FeCoCrNiMo alloy matrix is ​​strengthened, the strength of the composite material is ensured, and the impact of the addition of soft metal Ag on the hardness of the composite material can be reduced. At the same time, due to the low shear strength of Ag, the friction coefficient of the composite material is reduced. During the high-temperature friction process, the molybdenum in the matrix of the composite material can be oxidized to form molybdenum oxide, and the oxide of elemental silver and molybdenum is due to the tribochemical reaction Silver molybdate is generated in situ, and silver molybdate has obvious lubricating effect at high temperature (greater than 700°C), realizing the high temperature lubrication performance of the composite material at 800°C, and obtaining a wide temperature range from room temperature to 800°C. Self-lubricating compound.

Description

technical field [0001] The invention relates to the technical field of self-lubricating materials, in particular to a FeCoCrNiMo-based high-entropy alloy composite material and its preparation method and application. Background technique [0002] The development of high-performance high-temperature solid lubricating composite materials and technologies is one of the effective means to solve the friction and wear problems of friction parts under extreme working conditions such as high temperature and ensure the reliable and stable operation of the system. The mechanical properties of the high-temperature solid lubricating material matrix are the basic guarantee for the excellent performance of the composite material, and the addition of the lubricating phase is the key to the realization of the self-lubricating composite material. [0003] High-entropy alloys are one of the frontier fields of alloy research in recent years. Eutectic high-entropy alloys have attracted a lot of...

Claims

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Application Information

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Patent Type & Authority Patents(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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