Nickel aluminum base-width temperature-range self-lubrication alloy and preparation method thereof

A wide temperature range, self-lubricating technology, used in measuring devices, instruments, mechanical devices, etc., can solve the problem of high friction coefficient, and achieve the effects of high oxidation stability, good structure and good heat resistance.

Inactive Publication Date: 2019-03-01
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

Chinese patent CN102102155A discloses a self-lubricating material of nickel aluminum/graphite, and Al 3 o 3 When pairing, the friction coefficient is 0.31~0.37 at 25°C, and 0.42~0.48 at 600°C. The friction coefficient is higher at high temperature, and the friction and wear perf...

Method used

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  • Nickel aluminum base-width temperature-range self-lubrication alloy and preparation method thereof
  • Nickel aluminum base-width temperature-range self-lubrication alloy and preparation method thereof
  • Nickel aluminum base-width temperature-range self-lubrication alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to mass percentage Ni 3 75% of Al powder, 10% of Mo powder, 5% of Cr powder, and 10% of Ag powder were weighed as powder materials; the powder materials were dry-mixed in a planetary ball mill with a speed of 250r / min and a ball-to-material ratio of 8:1. The grinding balls are WC balls, and the ball milling time is 6 hours to obtain uniformly mixed Ni 3 Al-Mo-Cr-Ag mixed powder. Then put the mixed powder into a graphite mold coated with BN, put it into a vacuum hot-press sintering furnace for hot-press sintering, and the vacuum degree of the furnace cavity is 10 -2 ~10 -1 Pa, the heating rate is 12°C / min, the sintering temperature is 1100°C, the sintering pressure is 35MPa, and the sintering time is 60min. After sintering, cool down to room temperature with the furnace to obtain dense Ni 3 Al-10%Mo-Cr5%-10%Ag high temperature self-lubricating composite material.

[0028] After testing, the micro-Vickers hardness of the material is 3.5GPa, and the friction...

Embodiment 2

[0031] According to the mass percentage 70%Ni 3 Al powder, 8%Mo powder, 10%Cr powder, 12%Ag powder, weigh the powder materials respectively; place them in a planetary ball mill for dry mixing, the speed is 200r / min, the ball-to-material ratio is 6:1, grind The balls are WC balls, and the ball milling time is 8 hours to obtain uniformly mixed Ni 3 Al-Mo-Cr-Ag mixed powder. Put the mixed powder into a graphite mold coated with BN, and then put it into a vacuum hot-pressing sintering furnace for hot-pressing sintering, and the vacuum degree of the furnace cavity is 10 -2 ~10 -1 Pa, the heating rate is 15°C / min, the sintering temperature is 1150°C, the sintering pressure is 30MPa, and the sintering time is 20min. After sintering, cool down to room temperature with the furnace to obtain dense Ni 3 Al-8%Mo-10%Cr-12%Ag high temperature self-lubricating composite material.

[0032] After testing, the micro-Vickers hardness of the material is 3.4GPa, and the friction coefficient a...

Embodiment 3

[0035] According to the mass percentage 75%Ni 3 Al powder, 8%Mo powder, 7%Cr powder, 20%Ag powder, weigh the powder materials respectively, put them into a planetary ball mill for dry mixing, the speed is 300r / min, the ball-to-material ratio is 4:1, mill The balls are WC balls, and the ball milling time is 8 hours to obtain uniformly mixed Ni 3 Al-Mo-Cr-Ag mixed powder. Put the mixed powder into a graphite mold coated with BN, and then put it into a vacuum hot-pressing sintering furnace for hot-pressing sintering, and the vacuum degree of the furnace cavity is 10 -2 ~10 -1 Pa, the heating rate is 15°C / min, the sintering temperature is 1050°C, the sintering pressure is 30MPa, and the sintering time is 30min. After sintering, cool down to room temperature with the furnace to obtain dense Ni 3 Al-8%Mo-7%Cr-20%Ag high temperature self-lubricating composite material.

[0036] After testing, the micro-Vickers hardness of the material is 2.8GPa, and the friction coefficient and ...

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Abstract

The invention discloses nickel aluminum base-width temperature-range self-lubrication alloy. According to the alloy, Ni3Al with excellent high-temperature mechanical performance and oxidation resistance is used as a substrate, by adding an alloy element Mo, the high-temperature strength of the material is improved, by adding an alloy element Cr, the middle-temperature brittleness of the material is improved, and by adding soft metal Ag, the room-temperature toughness of the material is improved; the wide-temperature-range lubrication performance of the alloy is achieved through the lubricationfunction of the soft metal Ag at the middle and low temperature, and silver molybdate and silver chromate which are generated through a friction chemical reaction and an eutectic mixture of silver molybdate and silver chromate form solid-liquid lubrication in the high-temperature friction process. The prepared nickel aluminum base-width temperature-range self-lubrication alloy is good in organization structure, has good wide-temperature-range lubrication anti-resistance performance (the room temperature is 900 DEG C), is good in heat resistance and oxidation stability, is used as a processingmaterial for high-temperature motion system components such as bearings and seals and has wide application prospects.

Description

technical field [0001] The invention relates to a fully metallized high-temperature self-lubricating material, in particular to a nickel-aluminum-based wide-temperature range self-lubricating alloy, which is used for processing high-temperature motion system components such as high-temperature bearings. Background technique [0002] High-temperature lubrication is one of the key guarantee technologies for thermomechanical transmission mechanisms. The high-temperature lubrication performance of a mechanical system is directly related to its reliability, stability, energy efficiency and durability. Above 300°C, conventional lubricating oil, grease, and polymer-based self-lubricating composite materials can no longer meet the requirements of use, and high-temperature solid lubricating materials have higher operating temperatures. High-end equipment manufacturing and cutting-edge technology industries have a huge demand for high-performance high-temperature solid lubricant mate...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C19/05G01N3/56G01N19/02
CPCC22C1/0441C22C19/056C22C19/057G01N3/56G01N19/02
Inventor 朱圣宇杨军程军刘维民乔竹辉谈辉
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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