SiC nano-wire reinforced porous ceramic composite material and preparation method thereof

A technology of porous ceramics and composite materials, applied in ceramic products, other household appliances, applications, etc., can solve the problems of insufficient effective filtration performance, poor performance reliability, and low service life, so as to improve filtration performance and high temperature insulation performance, The effect of reducing size and improving performance

Active Publication Date: 2018-12-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, porous ceramic materials are mainly made of ceramic powder, which are formed by injection, dry pressing, sintering and other processes to obtain porous ceramic materials. The porous ceramics obtained by these methods have the advantages of high porosity, controllable pore size, and high production efficiency. However, due t...

Method used

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Embodiment 1

[0019] A SiC nanowire-reinforced porous ceramic composite with a bulk density of 1.0 g / cm 3 , with a through-porosity of 60%, consisting of porous ceramics, SiC nanowires, an interface layer and a SiC matrix, characterized in that SiC nanowires are grown in-situ in porous ceramics, and the interface layer is coated on the surface of SiC nanowires and porous ceramics, The SiC matrix is ​​filled in the gaps between the porous ceramics and the SiC nanowires; the porous ceramics are silicon carbide porous ceramics with a volume density of 0.6g / cm 3 , the through-porosity is 85%, and the hole density is 60PPI; the diameter of the SiC nanowire is 50nm, and the length is 1mm; the interface layer is a SiC interface layer, and the thickness is 0.3 μm.

[0020] A method for preparing a SiC nanowire reinforced porous ceramic composite material, characterized in that it comprises the steps in the following order:

[0021] (1) Ultrasonic cleaning of the porous ceramics with absolute ethan...

Embodiment 2

[0027] A SiC nanowire-reinforced porous ceramic composite with a bulk density of 0.8 g / cm 3 , with a through-porosity of 65%, consisting of porous ceramics, SiC nanowires, an interface layer and a SiC matrix, characterized in that SiC nanowires are grown in-situ in porous ceramics, and the interface layer is coated on the surface of SiC nanowires and porous ceramics, The SiC matrix is ​​filled in the gaps between the porous ceramics and the SiC nanowires; the porous ceramics are alumina porous ceramics with a volume density of 0.5g / cm 3 , the through-porosity is 85%, and the hole density is 60PPI; the diameter of the SiC nanowire is 50nm, and the length is 1mm; the interface layer is a BN interface layer, and the thickness is 0.3 μm.

[0028] A method for preparing a SiC nanowire reinforced porous ceramic composite material, characterized in that it comprises the steps in the following order:

[0029] (1) Ultrasonic cleaning of the porous ceramics with absolute ethanol, and d...

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Abstract

The invention discloses a SiC nano-wire reinforced porous ceramic composite material and a preparation method thereof. The material has a bulk density of 0.5-1.8 g/cm<3> and a through-hole ratio of 50-80%, and is composed of porous ceramic, SiC nano-wires, an interface layer and a SiC matrix, the SiC nano-wires in situ grow in the porous ceramic, the surfaces of the SiC nano-wires and the porous ceramic are coated with the interface layer, and gaps of the porous ceramic and the SiC nano-wires are filled with the SiC matrix. The SiC nano-wires are used to reinforce a porous ceramic composite material, so the internal specific surface area of the porous ceramic is effectively improved, and the porous ceramic is structurally toughened and reinforced; and in-situ filling with the SiC matrix significantly improves the filtration performance and the high-temperature heat insulation performance of the porous ceramic composite material.

Description

technical field [0001] The invention relates to a porous ceramic composite material and a preparation method thereof, in particular to a SiC nanowire reinforced porous ceramic composite material and a preparation method thereof. Background technique [0002] The porous ceramic structure presents a three-dimensional network structure, which has low density, high porosity, large specific surface area, good thermal shock resistance, chemical corrosion resistance, low thermal expansion coefficient, good dimensional stability and good filtration adsorption. It is used in gas and liquid filtration, purification and separation, chemical catalysis, sound absorption and shock absorption, high temperature insulation materials and other fields. However, due to the high brittleness of porous ceramics, and the size of the pores of porous ceramics is generally between tens to hundreds of microns, when it is used in the fields of filter materials and sound-absorbing and heat-insulating mat...

Claims

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Application Information

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IPC IPC(8): C04B41/89C04B35/565C04B35/80C04B35/622
CPCC04B35/806C04B35/565C04B35/622C04B41/009C04B41/52C04B41/89C04B2235/5244C04B2235/614C04B2235/616C04B35/10C04B38/00C04B41/4596C04B41/5059C04B41/4529C04B41/5064C04B41/4531C04B41/4983C04B41/455
Inventor 肖七巧陈照峰廖家豪
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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