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Zirconia composite ceramic and preparation method thereof

A composite ceramic and zirconia technology, which is applied in the field of zirconia ceramics, can solve the problems of decreased strength and toughness, low fracture toughness of ceramics, and cannot meet the conditions of use, and achieves the effects of simple preparation method, low sintering temperature, and enhanced toughness.

Active Publication Date: 2014-05-07
SHENZHEN SUNTECH ADVANCED CERAMICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in some special use occasions, the conditions of use cannot be met, such as the fracture toughness of ceramics is too low to withstand the shear force and pull-out force, or some use environments require the engineering materials used to have electrical conductivity
Zirconia ceramics have the highest mechanical properties at room temperature among ceramic materials, but their strength and toughness decrease sharply with the rise of temperature, and they are insulators at room temperature, which restricts their large-scale application. Therefore, research and development of a new type of zirconia Composite ceramics are currently a research hotspot in this field

Method used

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  • Zirconia composite ceramic and preparation method thereof
  • Zirconia composite ceramic and preparation method thereof
  • Zirconia composite ceramic and preparation method thereof

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preparation example Construction

[0039] see image 3 , the preparation method of the zirconia composite ceramics of an embodiment, comprises the following steps:

[0040] S210, immersing 1-5mm carbon fibers in oleic acid, ultrasonically dispersing for 12-24 hours, taking out and drying, so that an oleic acid film is formed on the surface of the carbon fibers.

[0041] In this embodiment, the carbon fiber is formed by chopping carbon fiber filaments, which has the advantages of uniform dispersion, various feeding methods, and simple process.

[0042] In this embodiment, the mass ratio of oleic acid to carbon fiber is 10:1.

[0043] In this embodiment, the drying method specifically includes: drying naturally or drying in an oven at 40-50°C.

[0044] By immersing the carbon fiber in oleic acid, an oleic acid film is formed on the surface, so that it can get better compatibility in the oily binder.

[0045] S220. Mix the dried carbon fiber with a binder, and stir at 170-180° C. for 1-2 hours to obtain a first...

Embodiment 1

[0064] Immerse 100g of 1mm carbon fiber in 1000g of oleic acid, ultrasonically disperse it for 12 hours, take it out and dry it in the air to form an oleic acid film on the surface, mix the dried carbon fiber with 400g of polymethyl methacrylate with a mass ratio of 40:70:10, The binder prepared from paraffin wax and stearic acid was mixed and stirred at 170° C. for 2 hours to obtain the first mixture. The first mixture, 1900 g of zirconia and 100 g of yttrium oxide were mixed, heated to 170° C., stirred for 2 hours, and crushed to obtain the second mixture. The second mixture was molded at 170° C. to obtain a green body. Soak the green body in kerosene at 50°C for 12 hours to remove paraffin, then remove polymethyl methacrylate and stearic acid at 500°C and 400Pa vacuum. in CH 4 In a gas atmosphere, the green body from which the binder has been removed is sintered at 1450° C. to obtain the zirconia composite ceramic.

[0065] Figure 5 Macrophotograph of the zirconia comp...

Embodiment 2

[0068] Immerse 100g of 5mm carbon fiber in 1000g of oleic acid, ultrasonically disperse it for 12 hours, take it out and dry it in an oven at 40°C to form an oleic acid film on the surface, and mix the dried chopped carbon fiber with 300g of oleic acid with a mass ratio of 40:70:10 A binder prepared from polymethyl methacrylate, paraffin wax and stearic acid was mixed and stirred at 180° C. for 1 hour to obtain a first mixture. The first mixture, 1900g of zirconia and 100g of calcium oxide were mixed, heated to 180°C, stirred for 4 hours, and crushed to obtain the second mixture. The second mixture was molded at 180° C. to obtain a green body. Soak the green body in kerosene at 60°C for 24 hours to remove paraffin, then remove polymethylmethacrylate and stearic acid at 500°C and 400Pa vacuum. in CH 4 In a gas atmosphere, the green body from which the binder has been removed is sintered at 1490° C. to obtain the zirconia composite ceramic.

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Abstract

A zirconia composite ceramic comprises zirconia, a stabilizing agent and carbon fiber, wherein the carbon fiber is uniformly mixed with the zirconia and the stabilizing agent, and in the zirconia composite ceramic, the volume content of the carbon fiber is 5%-20%. According to the zirconia composite ceramic, a toughening function of the carbon fiber is utilized, so that the toughness of the zirconia composite ceramic is effectively enhanced; meanwhile, the carbon fiber is uniformly distributed, and a mutual-lapping lattice structure is formed in the zirconia composite ceramic, so as to enable the zirconia composite ceramic to have the electric conductivity at a room temperature. The invention further provides a preparation method for the zirconia composite ceramic.

Description

technical field [0001] The invention relates to the field of zirconia ceramics, in particular to a zirconia composite ceramic and a preparation method thereof. Background technique [0002] As the scope of use of special ceramics increases, the defects of ceramics themselves are also exposed. Ceramics, as an inorganic material, have extremely high hardness (the Vickers hardness of the most commonly used alumina can reach more than 90), high temperature resistance , Friction resistance, insulation properties, excellent biocompatibility. However, in some special use occasions, the conditions of use cannot be met. For example, the fracture toughness of ceramics is too low to withstand shear force and pull-out force, or some use environments require that the engineering materials used have electrical conductivity. Zirconia ceramics have the highest mechanical properties at room temperature among ceramic materials, but their strength and toughness decrease sharply with the rise ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/48C04B35/622
Inventor 王明明
Owner SHENZHEN SUNTECH ADVANCED CERAMICS