Porous high-entropy alloy material and preparation method and application thereof

A high-entropy alloy, pre-pressing technology, used in metal processing equipment, mechanical equipment, shafts and bearings, etc., can solve problems such as large differences in expansion coefficients, stuck, and whistling.

Active Publication Date: 2020-05-01
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

The existing porous materials mainly include polyimide, polyoxymethylene and phenolic wood, but these three types of porous materials have technical defects of low mechanical strength and low porosity during use
In addition, due to the large difference in expansion coefficient between polymer and steel rolling bearings, when the temperature changes, the expansion of the cage and the inner and outer rings are different, which is prone to problems such as jamming and howling.

Method used

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  • Porous high-entropy alloy material and preparation method and application thereof
  • Porous high-entropy alloy material and preparation method and application thereof
  • Porous high-entropy alloy material and preparation method and application thereof

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preparation example Construction

[0021] The invention provides a method for preparing a porous high-entropy alloy material, comprising the following steps:

[0022] AlCoCrAgNi high-entropy alloy spherical powder is provided, and the particle size of the AlCoCrAgNi high-entropy alloy spherical powder is 25-380 μm;

[0023] The AlCoCrAgNi high-entropy alloy spherical powder is sequentially pre-pressed and sintered to obtain a porous high-entropy alloy material.

[0024] The invention provides AlCoCrAgNi high-entropy alloy spherical powder, the particle size of the AlCoCrAgNi high-entropy alloy spherical powder is 25-380 μm, preferably 25-38 μm, 38-75 μm, 75-106 μm, 106-150 μm, 150-250 μm or 250-μm- The particle size of the AlCoCrAgNi high-entropy alloy spherical powder is preferably obtained by particle size classification. The particle size range of the AlCoCrAgNi high-entropy alloy spherical powder defined by the invention can ensure uniform pore size of the prepared porous high-entropy alloy material.

[0...

Embodiment 1

[0036] (1) Weigh 54g of Al powder with a particle size of 30-50μm, 118g of Co powder with a particle size of 30-50μm, 104g of Cr powder with a particle size of 30-50μm, 216g of Ag powder with a particle size of 30-50μm and 118g of Ni powder with a particle size of 30-50 μm (the molar ratio is 20:20:20:20:20);

[0037] (2) Obtain high-entropy alloy spherical powder by atomization method;

[0038] (3) Use particle size sieves with a particle size of 25 μm and 106 μm to carry out particle size classification, and take alloy powders with a particle size between 25 μm and 106 μm for use;

[0039] (4) The obtained high-entropy alloy powder is packed into a low-carbon steel ladle, vacuum-packed, and pre-compressed with a cold isostatic press. The pressure of the pre-compressed process is 300 MPa, and the holding time is 30 min;

[0040] (5) Sinter the billets and sheaths obtained after pre-pressing with a hot isostatic press, the sintering pressure is 15MPa, the temperature rises fr...

Embodiment 2

[0045] (1) Weigh 54g of Al powder with a particle size of 30-50μm, 118g of Co powder with a particle size of 30-50μm, 104g of Cr powder with a particle size of 30-50μm, 216g of Ag powder with a particle size of 30-50μm and 118g of Ni powder with a particle size of 30-50 μm (the molar ratio is 20:20:20:20:20);

[0046] (2) Obtain high-entropy alloy spherical powder by atomization method;

[0047] (3) Use particle size sieves with a particle size of 75 μm and 106 μm to carry out particle size classification, and take alloy powders with a particle size between 75 μm and 106 μm for use;

[0048] (4) The obtained high-entropy alloy powder is packed into a low-carbon steel ladle, vacuum-packed, and pre-compressed with a cold isostatic press. The pressure of the pre-compressed process is 300 MPa, and the holding time is 30 min;

[0049] (5) Sinter the billet and sheath obtained after pre-pressing with a hot isostatic press, the sintering pressure is 10MPa, the temperature is raised ...

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Abstract

The invention provides a porous high-entropy alloy material and a preparation method and application thereof, and belongs to the technical field of high-entropy alloy preparation. The provided preparation method comprises the following steps that AlCoCrAgNi high-entropy alloy spherical powder is provided, and the particle size of the AlCoCrAgNi high-entropy alloy spherical powder is 25-380 microns; and the AlCoCrAgNi high-entropy alloy spherical powder is sequentially subjected to pre-pressing treatment and sintering to obtain the porous high-entropy alloy material. The prepared porous high-entropy alloy material has the advantages of being high in tensile strength, high in porosity, low in friction coefficient, and good in matching performance between the expansion coefficient and a bearing; and meanwhile, the prepared porous high-entropy alloy material, as a bearing retainer, can be used for a heavy machinery rolling bearing, and solve the problems that in the prior art, an oil bearing retainer is low in bearing capacity, and poor in the matching performance between the expansion coefficient and a steel bearing.

Description

technical field [0001] The invention belongs to the field of high-entropy alloy preparation, and in particular relates to a porous high-entropy alloy material and its preparation method and application. Background technique [0002] Porous materials containing oil (that is, porous oil storage materials) are used in high-speed rolling bearings. When subjected to heat, pressure and centrifugal force, the lubricating oil overflows the surface, forming good lubrication for the rollers and reducing the frictional moment of the bearing; when the bearing is stationary, the lubricating oil passes through the hair Sorption is re-stored inside the porous material, reducing evaporation. Porous oil storage materials can increase the service speed and life of bearings and reduce bearing friction torque. They have been used in high-speed and high-precision oil-impregnated bearings in industries such as aircraft and automobiles, and have good application prospects in high-end manufacturing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11B22F3/02B22F3/14B22F1/00B22F9/08C22C30/00F16C33/44F16C33/56F16C33/66
CPCB22F3/11B22F3/02B22F3/14B22F9/082C22C30/00F16C33/44F16C33/56F16C33/6637B22F1/05B22F1/065Y02T10/86
Inventor 杨丽君赵普王廷梅王齐华谢海
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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