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Lightweight high-strength elastic ceramic and preparation method thereof

A ceramic and elastic technology, applied in the field of lightweight and high-strength elastic ceramics and its preparation, can solve the problems of low strength and high brittleness, and achieve the effects of high porosity, low density and excellent high temperature stability

Pending Publication Date: 2022-02-01
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a light-weight and high-strength elastic ceramic and its preparation method, aiming to solve the problems of low strength and high brittleness of the current elastic ceramic materials

Method used

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  • Lightweight high-strength elastic ceramic and preparation method thereof
  • Lightweight high-strength elastic ceramic and preparation method thereof
  • Lightweight high-strength elastic ceramic and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment has prepared the density is 100mg / cm 3 The lightweight and high-strength elastic ceramics, the specific steps are as follows:

[0035] 1) Using 2g of SiC nanowire airgel disclosed in Chinese patent 201811626203.6 as a raw material, fill it into a graphite mold with an inner diameter of 40mm, and keep the filled height fixed at 15.9mm;

[0036] 2) Place it in a nitrogen atmosphere at 1100°C for 2 hours, and cool with the furnace to obtain a density of about 0.10g / cm 3 Lightweight and high-strength elastic ceramics.

Embodiment 2

[0038] This embodiment has prepared the density is 300mg / cm 3 The lightweight and high-strength elastic ceramics, the specific steps are as follows:

[0039] 1) Si disclosed in 4g Chinese invention patent 201811626361.1 3 N 4 Nanoribbon airgel is used as raw material, which is filled in a graphite mold with an inner diameter of 40mm, and the filled height is kept fixed at 10.6mm;

[0040] 2) Put it in a nitrogen atmosphere at 1200°C for 2 hours, and cool it with the furnace to obtain a density of about 0.30g / cm 3Lightweight and high-strength elastic ceramics.

[0041] Depend on figure 1 It can be seen that the lightweight and high-strength elastic ceramics prepared in this example have an obvious layered structure.

[0042] Depend on figure 2 It can be seen that in the lightweight and high-strength elastic ceramics prepared in this example, the inner layer is a porous network structure formed by cross-linked SiC nanowires.

[0043] Depend on image 3 It can be seen th...

Embodiment 3

[0045] This embodiment has prepared the density is 500mg / cm 3 The lightweight and high-strength elastic ceramics, the specific steps are as follows:

[0046] 1) Using 6g of SiC nanowire airgel disclosed in Chinese patent 201811626203.6 as a raw material, fill it in a graphite mold with an inner diameter of 40mm, and keep the filled height fixed at 9.5mm;

[0047] 2) Place it in a nitrogen atmosphere at 1100°C for 2 hours, and cool with the furnace to obtain a density of about 0.50 / cm 3 Lightweight and high-strength elastic ceramics.

[0048] Depend on Figure 4 It can be seen that the compressive stress-strain diagram of the lightweight and high-strength elastic ceramics prepared in this embodiment is in the direction perpendicular to the layer. The brittle behavior of traditional ceramics, when the compressive strain is less than 20%, the resulting lightweight and high-strength elastic ceramics can achieve complete recovery, when the compressive strain is 20%, the density ...

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Abstract

The invention discloses a lightweight high-strength elastic ceramic and a preparation method thereof, and belongs to the technical field of porous ceramic preparation, the lightweight high-strength elastic ceramic is formed by bonding ceramic nanowires to form a continuous porous layered network, and the lightweight high-strength elastic ceramic is prepared by taking ceramic nanowire aerogel as a raw material, the preparation method comprises the following steps: forming a layered structure, placing ceramic nanowire aerogel in a mold, and carrying out axial compression; welding the ceramic nanowires, and performing heat preservation treatment in the high-temperature oxygen-free environment, wherein the ceramic nanowires making contact with one another can be welded together through oxide layers on the surfaces of the nanowires so that the lightweight high-strength elastic ceramic is obtained.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous ceramic materials, and in particular relates to a light-weight and high-strength elastic ceramic and a preparation method thereof. Background technique [0002] Due to the characteristics of light weight, low thermal conductivity, high specific surface area, excellent chemical and high temperature stability, porous ceramics are widely used in thermal insulation, thermal protection, high temperature filtration, adsorption and other fields. However, as 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 it is easy to break during actual transportation or use. The traditional methods of preparing high porosity ceramics, such as direct foaming method, sacrificial template method and gel injection molding, generally produce high porosity ceramics wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/577C04B35/596C04B35/622
CPCC04B35/565C04B35/587C04B35/622C04B2235/77C04B2235/9607C04B2235/5264C04B2235/5244C04B2235/524C04B2235/658C04B2235/656C04B2235/3418
Inventor 王红洁冯靖雅侯丽娟涂昂易振宇卢德苏磊牛敏庄磊彭康
Owner XI AN JIAOTONG UNIV
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