High-entropy alloy silver immersion composite material and preparation method thereof, and application of high-entropy alloy silver immersion composite material

A high-entropy alloy and composite material technology, applied in the field of high-entropy alloy immersion silver composite materials and their preparation, can solve the problems of short life, low friction coefficient of high-entropy alloy immersion silver composite materials, wear resistance, poor sealing performance, and poor reliability question

Active Publication Date: 2020-04-07
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The high-entropy alloy silver-impregnated composite material prepared by the invention has the characteristics of good mechanical properties, low friction coefficient, good wear resistance and good sealing performance, and can solve the technical defects of short service life and poor reliability of existing 400-600 ℃ dynamic sealing materials

Method used

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  • High-entropy alloy silver immersion composite material and preparation method thereof, and application of high-entropy alloy silver immersion composite material
  • High-entropy alloy silver immersion composite material and preparation method thereof, and application of high-entropy alloy silver immersion composite material
  • High-entropy alloy silver immersion composite material and preparation method thereof, and application of high-entropy alloy silver immersion composite material

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preparation example Construction

[0025] The invention provides a method for preparing a high-entropy alloy immersion silver composite material, comprising the following steps:

[0026] (1) Under vacuum conditions, AlCoCrFeNi high-entropy alloy spherical powder is sintered to obtain a high-entropy alloy material; the particle size of the AlCoCrFeNi high-entropy alloy spherical powder is 30-200 μm;

[0027] (2) After the high-entropy alloy material and the silver-based composite powder are vacuum-encapsulated, sintering is carried out to obtain a high-entropy alloy-impregnated silver composite material;

[0028] The silver-based composite powder is prepared from components comprising the following parts by mass:

[0029] 80-90 parts of Ag powder, 5-15 parts of BN powder, SiO 2 Powder 0.5~5 parts, CaF 2 Powder 0~5 parts, BaF 2 0-5 parts of ZnO powder and 0-1 part of ZnO powder.

[0030] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available produc...

Embodiment 1

[0053] (1) Weigh 54g of Al powder, 118g of Co powder, 104g of Cr powder, 112g of Fe powder, and 118g of Ni powder, put them into a ball mill pot, and mix them in the ball mill. The particle size of the powder is 50-200 μm. The powder volume ratio is 2:1, the diameter of the grinding ball is 10mm and 5mm, the volume ratio of the two kinds of grinding balls is 2:1, the speed of the ball mill is 400rpm, and the grinding time is 40h to obtain the mixed powder;

[0054] (2) Prepare the mixed powder into AlCoCrFeNi high-entropy alloy spherical powder in metal vacuum atomization equipment;

[0055] (3) classify the obtained AlCoCrFeNi high-entropy alloy spherical powder with a 38 μm sampling sieve and a 76 μm sampling sieve, and select AlCoCrFeNi high-entropy alloy spherical powder with a particle size of 38 to 76 μm for use;

[0056] (4) The AlCoCrFeNi high-entropy alloy spherical powder obtained in step (3) is packed into a mould, and sintered in a vacuum two-way pressure furnace w...

Embodiment 2

[0064] (1) Weigh 14g of Al powder, 125g of Co powder, 116g of Cr powder, 120g of Fe powder, and 125g of Ni powder, put them into a ball mill pot, and mix them in the ball mill. The particle size of the powder is 50-200 μm. The powder volume ratio is 2:1, the diameter of the grinding ball is 10mm and 5mm, the volume ratio of the two kinds of grinding balls is 2:1, the speed of the ball mill is 400rpm, and the grinding time is 24h to obtain the mixed powder;

[0065] (2) Prepare the mixed powder into AlCoCrFeNi high-entropy alloy spherical powder in metal vacuum atomization equipment;

[0066] (3) Classify the obtained AlCoCrFeNi high-entropy alloy spherical powder with a 76 μm sampling sieve and a 105 μm sampling sieve, and select AlCoCrFeNi high-entropy alloy spherical powder with a particle size of 78-105 μm;

[0067] (4) The AlCoCrFeNi high-entropy alloy spherical powder obtained in step (3) is packed into a mould, and sintered in a vacuum two-way pressure furnace with a pre...

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Abstract

The invention provides a high-entropy alloy silver immersion composite material and a preparation method thereof, and application of the high-entropy alloy silver immersion composite material, and relates to the technical field of high-entropy alloy materials. The preparation method provided by the invention comprises the following steps of: (1) under a vacuum condition, sintering AlCoCrFeNi high-entropy alloy spherical powder to obtain a high-entropy alloy material; and (2) after the high-entropy alloy material and silver-based composite powder are subjected to vacuum packaging, performing sintering to obtain the high-entropy alloy silver immersion composite material. According to the preparation method, the silver-based composite powder is immersed into the AlCoCrFeNi high-entropy alloy,the characteristics of high strength and high wear resistance of the high-entropy alloy are combined with the characteristic of low friction coefficient of the silver-based composite material, the high-temperature oxidation resistance of the high-entropy alloy silver immersion composite material is improved, the application temperature of the high-entropy alloy silver immersion composite materialserving as a dynamic sealing material can reach 600 DEG C, and the technical defects that an existing 400-600 DEG C dynamic sealing material is short in service life and poor in reliability are overcome.

Description

technical field [0001] The invention relates to the technical field of high-entropy alloy materials, in particular to a high-entropy alloy-impregnated silver composite material and its preparation method and application. Background technique [0002] Domestic high-temperature dynamic sealing materials mainly include copper alloys, graphite and high-temperature alloys. Among them, copper alloy sealing rings mainly include Babbitt alloy sealing rings, tin bronze sealing rings, beryllium bronze sealing rings, etc., and the maximum service temperature is 350°C. Above 350℃, the mechanical strength of the copper alloy decreases rapidly, and the surface oxidation phenomenon intensifies. Graphite sealing materials include flexible graphite, pure graphite sintering, graphite impregnated resin, graphite impregnated metal and other types. The maximum service temperature of graphite sealing ring is 500 ℃. Advantages, graphite sealing rings are widely used in high-temperature dynamic s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06C22C32/00B22F3/14B22F1/00B22F9/08B22F7/00C22C30/00
CPCC22C5/06C22C32/0005B22F3/14B22F9/082B22F3/26B22F7/00C22C30/00C22C19/07B22F2999/00B22F1/05B22F2201/20
Inventor 杨丽君赵普王廷梅王齐华杨增辉
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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