High-temperature-resistant light-weight high-strength porous ceramic and preparation method thereof

A technology of porous ceramics and high temperature resistance, which is applied in the field of lightweight and high-strength porous ceramics and its preparation. It can solve the problems of excessive porous size distribution range, insufficient stability, and low reliability, and achieve high defect tolerance and short preparation cycle. , the effect of improving reliability

Active Publication Date: 2022-04-05
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a high-temperature-resistant lightweight high-strength porous ceramic and its preparation method, which can solve the problem of low strength, low reliability, and excessive porous size distribution range of existing porous ceramic materials. Technical problems of large size and insufficient stability at high temperature

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  • High-temperature-resistant light-weight high-strength porous ceramic and preparation method thereof
  • High-temperature-resistant light-weight high-strength porous ceramic and preparation method thereof
  • High-temperature-resistant light-weight high-strength porous ceramic and preparation method thereof

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preparation example Construction

[0037] The described high-temperature-resistant, light-weight, high-strength porous ceramic and its preparation method comprise the following steps:

[0038] Using ceramic nanowire airgel as raw material, through chemical vapor infiltration (or chemical vapor deposition, CVD), a layer of silicon carbide can be deposited on the surface of ceramic nanowires to become ceramic nanofibers. Ceramic nanowires in physical contact can be joined by deposited SiC to form fixed SiC nodes.

[0039] CVD process: At a temperature of 1000°C to 1300°C, hydrogen and argon are introduced into the CVD furnace (or called a CVI furnace), the gas flow rate of hydrogen is 20ml / min to 600ml / min, and argon is the diluent gas , the ventilation rate of argon gas is 20ml / min~600ml / min, and the precursor is trichloromethylsilane (CH3Cl3Si) gasified by vacuum gasification or bubbling gasification, and then passed into the furnace to control the precursor The flow rate is 20ml / min~600ml / min, and the tempera...

Embodiment 1

[0041] The present embodiment has prepared the density is 0.1g / cm 3 The high-temperature-resistant light-weight and high-strength porous ceramics, the specific steps are as follows:

[0042] 10mg / cm2 prepared by the method disclosed in Chinese patent CN109627006A 3 The silicon carbide nanowire airgel is used as raw material, which is placed in a CVD deposition furnace, and hydrogen and argon are introduced into the furnace at a temperature of 1000 ° C, and trichloromethylsilane is Pass it into the furnace so that the flow of trichloromethylsilane into the furnace is maintained at 20ml / min, continue to ventilate and keep warm for 12 hours, pyrolyze SiC on the surface of silicon carbide nanowires, increase the diameter of the nanowires and make them contact each other The nanowires form a SiC node at the contact; the hydrogen ventilation rate is 100ml / min; the argon ventilation rate is 100ml / min;

[0043] figure 1 Be the SEM picture of the silicon carbide nanowire airgel raw ...

Embodiment 2

[0045] The present embodiment has prepared the density is 0.3g / cm 3 The high-temperature-resistant light-weight and high-strength porous ceramics, the specific steps are as follows:

[0046] 10mg / cm2 prepared by the method disclosed in Chinese patent CN109627006A 3 SiC nanowire airgel was used as raw material, hydrogen and argon were introduced into the furnace at a temperature of 1100°C, and trichloromethylsilane (CH 3 Cl 3 Si) into the furnace, continue to ventilate and keep warm for 30h, generate SiC by pyrolysis on the surface of ceramic nanowires, and make the nanowires in contact with each other form SiC nodes at the contact points while increasing the diameter of the nanowires; the hydrogen gas ventilation rate Be 150ml / min; The argon ventilation rate is 150ml / min;

[0047] The resulting high-temperature-resistant, light-weight, high-strength porous ceramics have a volume density of 0.3 g / cm 3 , the porosity is 90.6%, and the compressive strength is 4.8MPa. When the...

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Abstract

The invention discloses a high-temperature-resistant light-weight high-strength porous ceramic and a preparation method thereof, and belongs to the technical field of porous ceramic preparation, a layer of silicon carbide is deposited on the surface of a ceramic nanowire, and the silicon carbide is a ceramic material with excellent high-temperature stability and has the characteristics of high strength and high hardness; therefore, a layer of silicon carbide is deposited on the surface of the ceramic nanowire, so that the ceramic nanofibers originally in physical contact are connected by the deposited silicon carbide, the high-temperature stability of the ceramic nanowire is improved, and experiments prove that the high-temperature-resistant light-weight high-strength porous ceramic has high defect tolerance, can bear the compressive strain as high as 40%, and can be used for preparing the high-temperature-resistant light-weight high-strength porous ceramic. The porous ceramic has a stable bearing function and relatively high reliability, has the characteristics of high porosity, low density, high strength, processability and maximum resistance to high temperature of 1600 DEG C, greatly improves the reliability, and is suitable for being used in the fields of heat insulation and fire prevention, catalyst carriers, high-temperature filtration and the like.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic preparation, and in particular relates to a high-temperature-resistant lightweight high-strength porous ceramic and a preparation method thereof. Background technique [0002] Porous ceramics are widely used in heat insulation, filtration, adsorption and other fields due to their light weight, high specific surface area, excellent chemical and high temperature stability and other characteristics. However, because the strength of the material decreases sharply with the increase of porosity, and the natural brittleness of ceramics, the mechanical reliability of high-porosity ceramic materials is low, and the tolerable compression deformation is low. In the actual transportation or use process easily broken. Due to the large pore size (>100μm) of traditional porous ceramics, it is prone to severe sintering shrinkage and unstable structure at high temperature (>1300°C). For example, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B35/565C04B35/622C04B35/624
Inventor 王红洁卢德庄磊苏磊牛敏彭康
Owner XI AN JIAOTONG UNIV
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