High-temperature self-lubricating nano composite ceramic material with toughness and preparation method thereof

A high-temperature self-lubricating, nano-composite technology, applied in the direction of lubricating compositions, base materials, petroleum industry, etc., can solve the reliability and stability limitations Widely used, nano-composite ceramics have little research on tribology, fracture toughness and surface hardness and other issues, to achieve the effect of improving comprehensive mechanical properties, low friction coefficient, and high fracture toughness

Inactive Publication Date: 2011-06-15
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, there are still several major problems in the current research: ①In ceramic matrix self-lubricating composite materials, in order to improve the high-temperature tribological properties of the material, a certain amount of solid lubricating components are usually introduced, and these flexible, layered structures, The introduction of anisotropic solid lubricant components will produce a large number of weak interfacial layers, which will cause a decrease in the mechanical properties of the material, especially the fracture toughness and surface hardness
② The reliability and stability of ceramic materials have always been one of the reasons that limit their wide application
However, there are relatively few studies on the tribology of nanocomposite ceramics, especially the lubrication technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 50gZrOCl 2 ·8H 2 O, 6gAl(NO 3 ) 3 9H 2 O and 3.5gY(NO 3 ) 3 ·6H 2 O was dissolved in 400ml of distilled water, stirred to completely dissolve the salt until the solution was transparent, and 3g of nano-molybdenum powder prepared by ball milling was dispersed into the above solution. In addition, prepare a 0.1M ammonia solution with distilled water, slowly add the above two solutions dropwise into 300ml of ammonia solution with a pH of 10, and stir vigorously at the same time. After the reaction is complete, the pH of the system remains basically unchanged. Get the prebody. Then wash with distilled water and absolute ethanol respectively, and finally calcined at 750°C for 2 hours to obtain ZrO 2 (3Y) / Al 2 o 3 / Mo nanocomposite powder. The prepared nano-composite powder was molded with a pressure of 300MPa, and the formed green body was sintered in a hot-press sintering furnace, the sintering temperature was 1400°C, the pressure was 30MPa, the holding time was ...

Embodiment 2

[0015] 50gZrOCl 2 ·8H 2 O, 12.5gAl(NO 3 ) 3 9H 2 O and 3.5gY(NO 3 ) 3 ·6H 2 O was dissolved in 400ml of distilled water, stirred to completely dissolve the salt until the solution was transparent, and 4.5g of nano-molybdenum powder prepared by ball milling was dispersed into the above solution. In addition, prepare a 0.1M ammonia solution with distilled water, slowly add the above two solutions dropwise into 300ml of ammonia solution with a pH of 10, and stir vigorously at the same time. After the reaction is complete, the pH of the system remains basically unchanged. Get the prebody. Then wash with distilled water and absolute ethanol respectively, and finally calcined at 850°C for 2 hours to obtain ZrO 2 (3Y) / Al 2 o 3 / Mo nanocomposite powder. The prepared nano-composite powder was molded with a pressure of 400 MPa, and the formed green body was sintered in a hot-press sintering furnace, the sintering temperature was 1300 ° C, the pressure was 40 MPa, the holding ...

Embodiment 3

[0017] 50gZrOCl 2 ·8H 2 O, 5gAl(NO 3 ) 3 9H 2 O and 3.5gY(NO 3 ) 3 ·6H 2 O was dissolved in 400ml of distilled water, stirred to completely dissolve the salt until the solution was transparent, and 7.5g of nano-molybdenum powder prepared by ball milling was dispersed into the above solution. In addition, prepare a 0.1M ammonia solution with distilled water, slowly add the above two solutions dropwise into 300ml of ammonia solution with a pH of 10, and stir vigorously at the same time. After the reaction is complete, the pH of the system remains basically unchanged. Get the prebody. Then wash with distilled water and absolute ethanol respectively, and finally calcined at 700°C for 2 hours to obtain ZrO 2 (3Y) / Al 2 o 3 / Mo nanocomposite powder. The prepared nano-composite powder was molded with a pressure of 500 MPa, and the formed green body was sintered in a hot-press sintering furnace, the sintering temperature was 1350 ° C, the pressure was 30 MPa, the holding tim...

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Abstract

The invention discloses a high-temperature self-lubricating nano composite ceramic material with toughness and a preparation method thereof. The material consists of a matrix phase, a reinforcing phase and a lubricating phase; the structure of the material mainly consists of hybrid crystal boundary type, intra-crystal type and nano-nano type; the matrix phase is ZrO2-Y2O3 and accounts for 65 to 80 mass percent, and the grain diameter of the matrix phase is 50 to 100 nanometers; the reinforcing phase is Al2O3 and accounts for 5 to 10 mass percent, and the grain diameter of the reinforcing phase is 100 to 150 nanometers; and the lubricating phase is metal Mo and accounts for 10 to 30 mass percent, and the grain diameter of the lubricating phase is 200 to 300 nanometers. The hybrid structure of the material has very high fracture toughness; and due to a lubricating oxide film generated at high-temperature friction, the material has low friction coefficient and can be used as a structural material.

Description

technical field [0001] The invention relates to a high-temperature self-lubricating nano-composite ceramic material with high toughness and a preparation method thereof. Background technique [0002] Ceramic-based self-lubricating composite materials are considered to be the ceramic lubrication technology with the most development potential and practical value, and have broad application prospects and value in high-tech fields such as aerospace and national defense. However, there are still several major problems in the current research: ①In ceramic matrix self-lubricating composite materials, in order to improve the high-temperature tribological properties of the material, a certain amount of solid lubricating components are usually introduced, and these flexible, layered structures, The introduction of anisotropic solid lubricant components will produce a large number of weak interfacial layers, which will lead to a decrease in the mechanical properties of the material, es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M125/04C22C1/05C22C29/12C10M103/06
Inventor 胡丽天张永胜胡天昌秦宝峰李昊坤
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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