A kind of high-entropy alloy immersion silver composite material and its preparation method and application

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

Active Publication Date: 2020-10-23
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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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

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  • A kind of high-entropy alloy immersion silver composite material and its preparation method and application
  • A kind of high-entropy alloy immersion silver composite material and its preparation method and application
  • A kind of high-entropy alloy immersion silver composite material and its preparation method and application

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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 impregnated with silver composite material and its preparation method and application, and relates to the technical field of high-entropy alloy materials. The preparation method provided by the invention comprises the following steps: (1) sintering AlCoCrFeNi high-entropy alloy spherical powder under vacuum conditions to obtain a high-entropy alloy material; (2) sintering the high-entropy alloy material and silver-based composite powder After vacuum packaging, sintering is carried out to obtain the high-entropy alloy immersion silver composite material. In the present invention, after the silver-based composite material is immersed in the AlCoCrFeNi high-entropy alloy, the high-entropy alloy has high strength and high wear resistance characteristics and the low friction coefficient characteristic of the silver-based composite material is combined, and the high-entropy alloy immersion is improved at the same time. The high-temperature oxidation resistance of the silver composite material enables it to be used as a dynamic sealing material at a temperature up to 600°C, which solves the technical defects of short service life and poor reliability of the existing 400-600°C dynamic sealing material.

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 Patents(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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