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Multilayered structure aluminium oxide self-lubricating composite ceramic, and preparation method thereof

A composite ceramic and multi-layer structure technology, which is applied in the field of multi-layer structure alumina self-lubricating composite ceramics and its preparation, can solve the decline in mechanical properties of materials, restrict the application and industrialization process of ceramic lubricating composite materials, reliability and anti-damage. It can overcome the problems of poor mechanical properties, excellent thermal shock resistance, and high flexural strength.

Active Publication Date: 2016-12-21
YANTAI ZHONGKE RES INST OF ADVANCED MATERIALS & GREEN CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent brittleness of ceramic materials and the decline in the mechanical properties of materials caused by tribological design, their reliability and damage resistance are poor, which restricts the wider application of ceramic lubricating composite materials in the mechanical field. application and industrialization process

Method used

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  • Multilayered structure aluminium oxide self-lubricating composite ceramic, and preparation method thereof
  • Multilayered structure aluminium oxide self-lubricating composite ceramic, and preparation method thereof
  • Multilayered structure aluminium oxide self-lubricating composite ceramic, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Ball milling 300 g of alumina with a particle size range of 100-200 mesh in an alcohol medium for 24 hours can obtain an ultrafine powder with an alumina particle size of 50 nm to 200 nm; the above 0.69 g alumina ultrafine powder and 0.23 g of metal molybdenum powder is mixed in a vibrating mixer for 2 hours to obtain an alumina-molybdenum mixed powder; the prepared alumina and alumina-molybdenum powder are alternately layered in a steel mold, and the layer thickness is 1.50 mm. After the laying is finished, it is preformed by cold pressing at a pressure of 150 MPa. Finally, put it into a hot pressing furnace for sintering at a heating rate of 10 ℃ / min, a sintering temperature of 1400 ℃, a sintering pressure of 10 MPa, and a sintering time of 120 minutes. The entire sintering process is carried out under argon protection. The analysis of the finally obtained sintered sample shows that the layered structure is obvious, the average thickness of each layer is 277 μm, and th...

Embodiment 2

[0030] Ball milling 300 g of alumina with a particle size range of 100-200 mesh in an alcohol medium for 24 hours can obtain an ultrafine powder with an alumina particle size of 50 nm to 200 nm; the above 0.43 g alumina ultrafine powder and 0.14 g of metal molybdenum powder is mixed in a vibrating mixer for 2 hours to obtain an alumina-molybdenum mixed powder; the prepared alumina and alumina-molybdenum powder are alternately layered in a steel mold, and the layer thickness is 0.95 mm. After the laying is finished, it is preformed by cold pressing at a pressure of 150 MPa. Finally, put it into a hot pressing furnace for sintering, the heating rate is 5 ℃ / min, the sintering temperature is 1450 ℃, the sintering pressure is 25 MPa, and the sintering time is 100 minutes. The entire sintering process is carried out under argon protection. The analysis of the finally obtained sintered sample shows that the layered structure is obvious. The average thickness of each layer is 172 μm. T...

Embodiment 3

[0032] Ball milling 300 g of alumina with a particle size range of 100-200 mesh in an alcohol medium for 24 hours can obtain ultra-fine alumina powder with a particle size of 50 nm to 200 nm; the above 1.81 g of alumina ultra-fine powder and 0.60 g of metal molybdenum powder is mixed in a vibrating mixer for 2 hours to obtain an alumina-molybdenum mixed powder; the prepared alumina and alumina-molybdenum powder are alternately layered in a steel mold, and the layer thickness is 4.00 mm. After the laying is finished, it is preformed by cold pressing at a pressure of 150 MPa. Finally, put it into a hot pressing furnace for sintering at a heating rate of 10°C / min, a sintering temperature of 1350°C, a sintering pressure of 20 MPa, and a sintering time of 80 minutes. The entire sintering process is carried out under argon protection. The analysis of the finally obtained sintered sample shows that the layered structure is obvious, the average thickness of each layer is 721 μm, and th...

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Abstract

The invention discloses a multilayered structure aluminium oxide self-lubricating composite ceramic. The multilayered structure aluminium oxide self-lubricating composite ceramic is formed via alternative overlapping of aluminium oxide-metallic molybdenum layers and aluminium oxide layers; wherein the aluminium oxide-metallic molybdenum layer is taken as the surface layer, the aluminium oxide layers are taken as interval layers, layer thickness ratio is controlled to be 1:1, layer thickness is controlled to be 150 to 1000<mu>m, the aluminium oxide-metallic molybdenum layers contain 73 to 76wt% of aluminium oxide and 24 to 27wt% of metallic molybdenum. The invention also discloses a preparation method of the multilayered structure aluminium oxide self-lubricating composite ceramic. The multilayered structure aluminium oxide self-lubricating composite ceramic possesses excellent mechanical properties (high toughness), thermal stability (high thermal shock resistance), and tribology performance (low frictional wear), and excellent self-lubricating properties in a temperature range from room temperature to 1000 DEG C, and is especially suitable to be used for preparing special workpieces with low friction and high thermal shock resistance at high temperature service conditions.

Description

Technical field [0001] The invention relates to a multilayer structure alumina self-lubricating composite ceramic and a preparation method thereof, and belongs to the technical field of design and preparation of self-lubricating composite materials in service under extreme environments. Background technique [0002] The reliability and stability of lubricating materials have become a key factor to ensure the safe, efficient and stable operation of high-end equipment mechanical systems such as aviation, aerospace, nuclear energy, and rail transit. In recent years, with the rapid development of modern industry and high technology in my country, the operating conditions of mechanical parts have become more and more demanding, and the conditions have become more and more complex. The service conditions of lubricating materials involve high temperature, strong corrosion, vibration, special media and atmosphere, etc. The multi-factor coupling environment puts forward higher requirements...

Claims

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Application Information

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IPC IPC(8): C22C29/12C22C1/05C22C1/10C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/96C04B2235/9684C22C1/051C22C29/005C22C29/12
Inventor 张永胜宋俊杰胡丽天苏云峰樊恒中
Owner YANTAI ZHONGKE RES INST OF ADVANCED MATERIALS & GREEN CHEM ENG
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