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NiCr-Al2O3 self-lubricating composite material and preparation method thereof

A composite material and self-lubricating technology, which is applied to the preparation of parts and components that serve under high-temperature conditions. In the field of preparation of high-temperature self-lubricating composite materials, it can solve the problems that no systematic research reports have been seen, and no solid lubricating materials have been retrieved. , to achieve the effect of good friction and wear performance and wide temperature range lubrication performance, improved friction and wear performance, and uniform structure

Inactive Publication Date: 2014-02-12
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

[0003] At present, a lot of work has been carried out at home and abroad in terms of high-temperature lubrication and wear-resistant materials and technology research. A variety of metal-based high-temperature self-lubricating wear-resistant materials have obtained engineering applications, but most of them focus on the research of high-temperature lubrication and wear-resistant properties of materials. , there is no systematic research report on the design and research of wide temperature range self-lubricating function of materials
In terms of metal-based high-temperature self-lubricating wear-resistant materials and high-temperature self-lubricating alloys that have important engineering application values, only a small number of foreign patents that can be used at around 900 °C (related patents: US4728448) have been used at the top of the US aerospace industry. The technical field has been successfully applied, and the rest of the operating temperature is below 800°C. No patents related to solid lubricating materials that can achieve continuous lubrication from room temperature to 1000°C have been retrieved.

Method used

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  • NiCr-Al2O3 self-lubricating composite material and preparation method thereof
  • NiCr-Al2O3 self-lubricating composite material and preparation method thereof

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Embodiment 1

[0024] The present invention NiCr-Al 2 o 3 The components and mass percentages of the cermet-based wide-temperature range high-temperature self-lubricating composite material are: Ni: 38.4%, Cr: 9.6%, Al 2 o 3 : 32%, SrSO 4 : 10%, Ag: 10%. First, Ni and Cr powders with a purity greater than 99.0% were mixed according to the mass ratio of Ni: 38.4%, Cr: 9.6%, and the above mixture was mixed by wet ball milling on a four-pot planetary high-energy ball mill (FRITSCH, Germany). The ball milling time 20h, rotating speed 250r / min, ball material ratio 10:1. Then the powder purity greater than 99.0% Al 2 o 3 , SrSO 4 , Ag powder by nanometer Al 2 o 3 : 32%, SrSO 4 : 10%, Ag: 10% mass ratio mixed, and added to the above mixture, and then the above mixture using the above wet ball milling process, after drying, to obtain mixed powder. Weigh 50g of the above-mentioned mixed powder into a graphite mold for cold-press preforming, then put the above-mentioned graphite mold into a...

Embodiment 2

[0026] The present invention NiCr-Al 2 o 3 The components and mass percentages of the cermet-based wide-temperature range high-temperature self-lubricating composite material are: Ni: 36%, Cr: 9%, nano-Al 2 o 3 : 30%, SrSO 4 : 9%, Ag: 16%. First, Ni and Cr powders with a purity greater than 99.0% were mixed according to the mass ratio of Ni: 36%, Cr: 9%, and the above mixture was mixed by wet ball milling on a four-pot planetary high-energy ball mill (FRITSCH, Germany). The ball milling time 20h, rotating speed 200r / min, ball material ratio 10:1. Then the powder purity greater than 99.0% Al 2 o 3 , SrSO 4 , Ag powder by nanometer Al2 o 3 : 30%, SrSO 4 : 9%, Ag: 16% in mass ratio, mixed and added to the above mixture, and then the above mixture was subjected to the above-mentioned wet ball milling process, and after drying, a mixed powder was obtained. Weigh 50g of the above-mentioned mixed powder into a graphite mold for cold-press preforming, then put the above-ment...

Embodiment 3

[0028] The present invention NiCr-Al 2 o 3 The components and mass percentages of the cermet-based wide temperature range high-temperature self-lubricating composite material are: Ni: 38.4%, Cr: 9.6%, Al 2 o 3 : 32%, SrSO 4 : 11%, Ag: 9%. First, Ni and Cr powders with a purity greater than 99.0% were mixed according to the mass ratio of Ni: 38.4%, Cr: 9.6%, and the above mixture was mixed by wet ball milling on a four-pot planetary high-energy ball mill (FRITSCH, Germany). The ball milling time 20h, rotating speed 250r / min, ball material ratio 10:1. Then the powder purity greater than 99.0% Al 2 o 3 , SrSO 4 , Ag powder by nanometer Al 2 o 3 : 32%, SrSO 4 : 11%, Ag: 9% in mass ratio, mixed and added to the above mixture, and then the above mixture was subjected to the above-mentioned wet ball milling process, and after drying, a mixed powder was obtained. Weigh 50g of the above-mentioned mixed powder into a graphite mold for cold-press preforming, then put the above...

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Abstract

The invention discloses a NiCr-Al2O3 self-lubricating composite material and a preparation method thereof. The material comprises the following components by mass: 35.04-39.36% of nickel, 8.76-9.84% of chromium, 29.2-32.8% of nanometer alumina, 9-11% of strontium sulfate, and 9-16% of silver. The material has the advantages of excellent frictional wear performance and wide-temperature range lubricating property from room temperature to 1000 DEG C, and can be used to solve problems of lubrication and wear resistance between related parts under special environment conditions in industrial fields of aerospace, petroleum, chemical engineering, and the like.

Description

technical field [0001] The invention belongs to the field of high-temperature lubricating materials, in particular to a NiCr-Al 2 o 3 The cermet-based wide temperature range high-temperature self-lubricating composite material, the present invention also relates to the preparation method of the high-temperature self-lubricating composite material, which is especially suitable for the preparation of parts and components serving under high-temperature conditions, and realizes lubrication and wear resistance. Background technique [0002] With the development of high technology, industrial sectors such as aviation, aerospace, nuclear technology, electronics and energy require materials that can withstand high temperatures (>400°C), low temperatures, and high vacuum (10 -6 Pa), strong radiation, heavy load and high-speed movement and other special working conditions. Among them, wear is one of the main ways of failure of mechanical parts, accounting for about 60% to 80% o...

Claims

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Application Information

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IPC IPC(8): C22C32/00C22C1/05
Inventor 贾均红刘峰王文珍易戈文陕钰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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