Preparation method of highly-compact nickel-aluminium-based self-lubricating material

A lubricating material and dense technology, applied in the field of preparation of nickel-aluminum-based self-lubricating materials, can solve the problems of easy falling off of graphite, reduced wear resistance, high brittleness, etc., and achieve the effect of uniform structure, uniform dispersion and fine particles

Inactive Publication Date: 2011-06-22
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

However, the material prepared by powder metallurgy always has a certain number of cavities and microcracks in the matrix, especially it is difficult to achieve a tight bond between the graphite and the matrix, so the material is relatively brittle, and the graphite is easy to fall off during the friction process. Reduced wear resistance

Method used

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  • Preparation method of highly-compact nickel-aluminium-based self-lubricating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First, mix 85.0wt% electrolytic nickel powder with a purity of 99.8% and 10.0wt% aluminum powder with a purity greater than 99%, and perform high-energy ball milling for 4 hours, then add 5.0wt% flake graphite powder and continue ball-milling for 2 hours. The ratio is 10:1, and the rotation speed is 200rav / min. After ball milling, sieve the composite powder, weigh an appropriate amount of composite powder and put it into a graphite mold, first perform cold pressing, the cold pressing pressure is 30MPa, and the holding time is 15 minutes, and then carry out hot pressing sintering in an intermediate frequency hot pressing sintering furnace , the sintering temperature is 1100°C, the pressure is 14MPa, and the holding time is 20 minutes; then it is cooled with the furnace to produce a highly dense (98.5%) nickel-aluminum-graphite self-lubricating material.

Embodiment 2

[0016] First, mix 87.0wt% electrolytic nickel powder with a purity of 99.8% and 8.5.0wt% aluminum powder with a purity greater than 99%, and perform high-energy ball milling for 4 hours, then add 4.5wt% flake graphite powder and continue ball milling for 3 hours. The ratio is 10:1, and the rotation speed is 150rav / min. After ball milling, sieve the composite powder, weigh an appropriate amount of composite powder and put it into a graphite mould, first perform cold pressing, the cold pressing pressure is 34MPa, the holding time is 15 minutes, and then carry out hot pressing sintering in the intermediate frequency hot pressing sintering furnace , the sintering temperature is 1150°C, the pressure is 12MPa, and the holding time is 25 minutes; then it is cooled with the furnace, and the highly dense (99.1%) nickel-aluminum-graphite self-lubricating material can be produced.

Embodiment 3

[0018] First, mix 86.0wt% electrolytic nickel powder with a purity of 99.8% and 9.0wt% aluminum powder with a purity greater than 99%, and perform high-energy ball milling for 4 hours, then add 5.0wt% flake graphite powder and continue ball-milling for 4 hours. The ratio is 10:1, and the rotation speed is 200rav / min. After ball milling, sieve the composite powder, weigh an appropriate amount of composite powder and put it into a graphite mold, first perform cold pressing, the cold pressing pressure is 30MPa, and the holding time is 10 minutes, and then carry out hot pressing sintering in an intermediate frequency hot pressing sintering furnace , the sintering temperature is 1000°C, the pressure is 13.5MPa, and the holding time is 20 minutes; then it is cooled with the furnace to produce a highly dense (98.6%) nickel-aluminum-graphite self-lubricating material.

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Abstract

The invention discloses a preparation method of a highly-compact nickel-aluminium-based self-lubricating material. The method adopts a combined technology of batch high-energy ball milling and powder metallurgy to prepare a material with a compactness of more than 98%. The invention is especially applicable to mechanical movement self-lubricating part materials working in a corrosive environment at a high temperature.

Description

technical field [0001] The invention relates to a preparation method of a high-density nickel-aluminum base self-lubricating material, belonging to the field of high-temperature-resistant lubricating materials. Background technique [0002] Nickel-based alloys have been used as materials used in high-temperature corrosive environments such as gas turbine blades, high-temperature engines, high-temperature metallurgy, high-temperature chemicals, and high-temperature boilers. After adding component aluminum to the nickel-based alloy, its high-temperature oxidation resistance and corrosion resistance are further improved. Since the 1970s, intermetallic nickel 3 The new high-temperature materials represented by aluminum have attracted worldwide attention. Its superior high-temperature strength and high-temperature oxidation and corrosion resistance are considered to play an important role in the new generation of engines and high-temperature chemical and metallurgical fields. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04
Inventor 贾均红王爱芳张定军易戈文王文珍
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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