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Sulfur-containing self-lubricating high-entropy alloy and preparation method thereof

A high-entropy alloy and self-lubricating technology, applied in the field of high-entropy alloys and anti-wear and anti-wear materials, can solve problems such as poor tribological properties, and achieve the effects of low cost, good mechanical properties, and good application prospects.

Inactive Publication Date: 2018-11-30
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of poor tribological properties of conventional high-entropy alloys, and provide a sulfur-containing self-lubricating high-entropy alloy and its preparation method. The self-lubricating high-entropy alloy has both good mechanical properties and wide temperature range self- Lubrication performance, good application prospects in working conditions such as lean oil, high temperature and heavy load

Method used

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  • Sulfur-containing self-lubricating high-entropy alloy and preparation method thereof
  • Sulfur-containing self-lubricating high-entropy alloy and preparation method thereof
  • Sulfur-containing self-lubricating high-entropy alloy and preparation method thereof

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Embodiment 1

[0034]Select Co, Cr, Fe, Ni and FeS bulk materials as raw materials, and apply non-consumable vacuum arc melting technology to prepare CoCrFeNiS 0.25 Self-lubricating high-entropy alloy. The main implementation steps are as follows:

[0035] 1) According to CoCrFeNiS 0.25 The atomic percentage of the self-lubricating high-entropy alloy is converted to the mass percentage of Co, Cr, Fe, Ni, FeS and other raw materials required, and the raw materials are measured according to the mass percentage.

[0036] 2) Grind the surface of the raw material of the block to remove scale, then put it into absolute ethanol, ultrasonically clean it for 10 min, remove the impurities on the surface, and then blow dry it for use.

[0037] 3) Put the cleaned block raw materials into the water-cooled copper crucible of the arc melting furnace, and vacuumize to 10 -3 Pa, and then filled with high-purity argon to the pressure of 10 ~ 20 Pa in the furnace, and then evacuated to 10 -3 Below Pa, re...

Embodiment 2

[0042] Select pure metal powders Al, Co, Cr, Fe, Ni and FeS powders as raw materials, and prepare Al by powder metallurgy 0.2 CoCrFeNiS 0.75 Containing S self-lubricating high-entropy alloy, the main implementation steps are as follows:

[0043] 1) According to Al 0.2 CoCrFeNiS 0.75 The atomic percentage of the required mass percentage of Al, Co, Cr, Fe, Ni and FeS and other raw materials is converted, and the raw material powder is measured according to the mass percentage.

[0044] 2) Put the raw material powder into a planetary ball mill for mixing, the ratio of ball to material is 3:1, the speed of the ball mill is 150 r / min, and the mixing time is 2 hours.

[0045] 3) Put the uniformly mixed raw materials into a graphite mold, and carry out hot-press sintering in a spark plasma sintering furnace. During sintering, the heating rate is 50 °C / min, the sintering temperature is 1200 °C, the sintering pressure is 30 MPa, and the sintering holding time is 10 min. Cool down w...

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Abstract

The invention discloses a sulfur-containing self-lubricating high-entropy alloy and a preparation method thereof. The component of the self-lubricating high-entropy alloy is MxCoCrFeNiSy, M is one ormore of Al, Ti, Mo, V, Nb, Mn, W and Zr, the atom proportion x of the content is 0 to 2, the atom proportion y of the element S is valued at 0.05 to 3, and the atom proportions of the other elements are all 0.5 to 1.5. The invention further discloses the preparation method for the self-lubricating high-entropy alloy. The sulfur-containing self-lubricating high-entropy alloy disclosed by the invention has both good mechanical property and wide-temperature range (from room temperature to 800 DEG C) self-lubricating property, moreover, the cost is low, the reliability is high, and the sulfur-containing self-lubricating high-entropy alloy can be applied to mechanical equipment which can hardly adopt conventional grease for lubrication in working conditions such as oil deficiency, high temperature and heavy duty, and has a good application prospect in fields such as metallurgy, mine, energy, automobile, military industry and nuclear industry.

Description

technical field [0001] The invention relates to a sulfur-containing self-lubricating high-entropy alloy and a preparation method thereof, belonging to the field of high-entropy alloys and wear-reducing and anti-wear materials. Background technique [0002] Professor Ye Junwei, a Taiwanese scientist in my country, first proposed the concept of high-entropy alloys in 1995. After more than 20 years of development, the design theory and preparation technology of high-entropy alloys have now tended to be perfected. Unlike conventional metal materials, high-entropy alloys are usually composed of a variety of metal (or non-metal) elements with equiatomic ratios or close to equiatomic ratios, and have simple face-centered cubic (FCC), body-centered cubic (BCC) or FCC+ The phase structure of BCC, but it has excellent properties such as strength, hardness, radiation resistance, high temperature resistance, corrosion resistance and wear resistance that are incomparable to conventional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C32/00C22C1/05C22C1/10
CPCC22C1/05C22C1/1036C22C30/00C22C32/0089
Inventor 孟军虎张爱军韩杰胜苏博
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI