High-temperature-resistance wide-temperature-region self-lubricating composite material and preparation method thereof

A composite material and wide temperature range technology, which is used in the field of high temperature resistant and wide temperature range self-lubricating composite materials and their preparation, can solve the problem that the narrow applicable temperature range cannot meet the actual use requirements of the wide temperature range, there is no public report, and the lubrication effect is lost. problem, to achieve the effect of high density, good structure and excellent performance

Inactive Publication Date: 2016-11-09
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

When the temperature is higher than 400°C, conventional lubricating greases, polymer-based self-lubricating materials, etc. lose their lubricating effect due to volatilization and decomposition, and single solid lubricants such as graphite, molybdenum disulfide, and soft metals have a narrow temperature range and cannot meet wide application conditions. The actual use requirements of the temperature domain
[0003] At present, there are public patents and related reports on wide temperature range self-lubricating materials and technologies at home and abroad, mainly from room temperature to high temperature of 700 ° C, while there are almost no public reports on wide temperature range lubricating materials and technologies from low temperature –60 ° C to high temperature

Method used

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  • High-temperature-resistance wide-temperature-region self-lubricating composite material and preparation method thereof
  • High-temperature-resistance wide-temperature-region self-lubricating composite material and preparation method thereof
  • High-temperature-resistance wide-temperature-region self-lubricating composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to mass percentage: 12%Ag, 5%BaF 2 / CaF 2 Eutectic, 4% graphite powder, 79% nickel-based alloy powder, each powder material was weighed separately. Among them, the composition of nickel-based alloy powder is 74%Ni, 15%Cr, 4%Mo, 5%Ti, 2%Al. Put various powders into WC ball milling tanks, the grinding balls are WC, and the ball-to-material ratio is 5:1, and then put the ball milling tanks in a high-energy ball mill, and mix them for 5 hours at a speed of 200 rpm to obtain mixed powders. Put the mixed powder into a graphite mold, and then place it in a vacuum hot-press sintering furnace for sintering. The parameters are: vacuum degree 1×10 -1 Pa, the heating rate is 25°C / min, the sintering temperature is 1250°C, the pressure is 35 MPa, and the holding time is 25min. After sintering, the material is cooled to room temperature with the furnace to obtain a self-lubricating composite material with high temperature resistance and wide temperature range.

[0020] T...

Embodiment 2

[0024] According to mass percentage: 15%Ag, 8%BaF 2 / CaF 2 Eutectic, 2% graphite powder, 75% nickel-based alloy powder, weigh each powder material respectively. Among them, the composition of nickel-based alloy powder is 70%Ni, 18%Cr, 3%Mo, 6%Ti, 3%Al. Put various powders into WC ball milling tanks, the grinding balls are WC, and the ball-to-material ratio is 4:1, then put the ball milling tanks in a high-energy ball mill, and mix for 8 hours at a speed of 180 rpm to obtain mixed powders. Put the mixed powder into a graphite mold, and then place it in a vacuum hot-press sintering furnace for sintering. The parameters are: vacuum degree 2×10 -1 Pa, the heating rate is 30°C / min, the sintering temperature is 1200°C, the pressure is 30 MPa, and the holding time is 20min. After sintering, the material is cooled to room temperature with the furnace to obtain a self-lubricating composite material with high temperature resistance and wide temperature range.

[0025] The room tempe...

Embodiment 3

[0029]According to mass percentage: 20%Ag, 10%BaF 2 / CaF 2 Eutectic, 1% graphite powder, 69% nickel-based alloy powder, each powder material was weighed separately. Among them, the composition of nickel-based alloy powder is 66%Ni, 20%Cr, 2%Mo, 8%Ti, 4%Al. Put various powders into WC ball milling tanks, the grinding balls are WC, and the ball-to-material ratio is 3:1, then put the ball milling tanks in a high-energy ball mill, and mix for 10 hours at a speed of 150 rpm to obtain mixed powders. Put the mixed powder into a graphite mold, and then sinter in a vacuum hot-press sintering furnace, the parameters are: vacuum degree 4×10 -1 Pa, the heating rate is 35°C / min, the sintering temperature is 1150°C, the pressure is 40 MPa, and the holding time is 15 minutes. After the sintering, the material is cooled to room temperature with the furnace to obtain a self-lubricating composite material with high temperature resistance and wide temperature range.

[0030] The room tempera...

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Abstract

The invention discloses a high-temperature-resistance wide-temperature-region self-lubricating composite material. The composite material comprises the following components in percentage by weight: 65-84% of nickel base alloy, 10-20% of Ag, 1-5% of graphite, and 5-10% of BaF2/CaF2 eutectic crystal; the nickel alloy is atomized alloy powder, and comprises the following components in percentage by weight: 61-77% of Ni, 15-20% of Cr, 1-4% of Mo, 5-10% of Ti, and 2-5% of Al; and the BaF2/CaF2 eutectic crystal consists of 38 weight% of CaF2 and 62 weight% of BaF2. The invention further discloses a preparation method of the composite material; and the composite material is prepared through a hot-pressed sintering technology. The composite material is low in friction coefficient and wear rate in a temperature range from low temperature (-60 DEG C) to high temperature 800 DEG C. The composite material is suitable for manufacturing such parts as high-temperature bearings and slide blocks, and is broad in application prospect in high-temperature moving systems of mechanical equipment.

Description

technical field [0001] The invention relates to a self-lubricating composite material with high temperature resistance and wide temperature range and a preparation method thereof. The composite material is suitable for high-temperature motion system components of mechanical equipment, and its working temperature can range from –60°C to 800°C. Background technique [0002] The rapid development of my country's high-tech has led to higher temperatures for moving parts in mechanical equipment, such as high-temperature bearings, high-temperature seals and other key components. Therefore, in the field of high-tech equipment, there is an urgent need for materials and technologies with continuous lubrication performance from low temperature (–60°C) to high temperature (800°C). When the temperature is higher than 400°C, conventional lubricating greases, polymer-based self-lubricating materials, etc. lose their lubricating effect due to volatilization and decomposition, and single s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C30/00C22C32/00C22C1/05
CPCC22C19/056B22F2998/10C22C1/05C22C30/00C22C32/0084C22C32/0089
Inventor 杨军刘维民甄金明朱圣宇程军乔竹辉
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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