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Ultra-temperature CNTs/TiB2-SiC ceramic composite material and preparation method thereof

A ceramic composite material, tib2-sic technology, which is applied in the field of ultra-high temperature CNTs/TiB2-SiC ceramic composite material and its preparation, can solve the problems of inability to break through fracture toughness and restriction of thermal shock resistance.

Active Publication Date: 2015-12-23
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Representative ZrB 2 base and HfB 2 However, after nearly ten years of development, although there have been breakthroughs in temperature resistance and ablation type, its thermal shock resistance has been restricting its development, and the fracture toughness cannot exceed 5MPa m 1 / 2

Method used

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  • Ultra-temperature CNTs/TiB2-SiC ceramic composite material and preparation method thereof
  • Ultra-temperature CNTs/TiB2-SiC ceramic composite material and preparation method thereof
  • Ultra-temperature CNTs/TiB2-SiC ceramic composite material and preparation method thereof

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preparation example Construction

[0037] An ultra-high temperature CNTs / TiB of the present invention 2 -The preparation method of SiC ceramic composite material includes:

[0038] S1: mixing step, firstly mixing titanium boride powder, silicon carbide powder and carbon nanotube powder to obtain a mixed powder of titanium diboride, silicon carbide and carbon nanotube powder; and

[0039] S2: a sintering step, sintering the mixed powder through a spark plasma sintering molding process to obtain the CNTs / TiB 2 -SiC ceramic composite material.

[0040] The S1 step can include:

[0041] S11: mixing step, mixing and drying titanium diboride powder, carbon nanotube powder and silicon carbide powder to obtain a dried mixed powder; and

[0042] S12: Grinding, grinding and sieving the dry mixed powder to obtain a uniformly mixed mixed powder.

[0043] In step S11, the average particle size of the titanium diboride powder is 10 nm to 50 nm, preferably 20 nm; and / or, the average particle size of the silicon carbide powder is 40 nm t...

Embodiment 1

[0059] According to the conventional process, the raw material powder is weighed according to the required proportion: using commercially available TiB 2 Powder, SiC powder, CNTs as raw materials, the purity of the powder is higher than 99%; TiB 2 The volume fractions of SiC powder and CNTs are 70%, 15% and 15%, respectively.

[0060] Using planetary ball mill for TiB 2 It is mixed with SiC powder. To prevent impurities from being mixed, ZrO with higher hardness and better chemical stability is used 2 The dispersion medium is anhydrous ethanol, and the spherical mass ratio is 10:1. First put TiB 2 After mixing with SiC, ball mill for 6 hours, at the same time disperse CNTs in absolute ethanol, vibrate with ultrasonic for 1 hour, after the two are mixed, continue wet grinding for 4 hours. Then CNTs / TiB 2 -The SiC slurry is placed on an evaporator to evaporate and dry, and finally placed in a constant temperature (80°C) drying oven for 24 hours.

[0061] The dried mixed powder is rep...

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Abstract

The invention provides a preparation method of an ultra-temperature CNTs / TiB2-SiC ceramic composite material. The method comprises the following steps of mixing, drying and grinding titanium diboride powder, silicon carbide powder and carbon nanotube powder to obtain mixed powder of titanium diboride, silicon carbide and carbon nanotube; then sintering the mixed powder through a spark plasma sintering moulding process to obtain the fast SPS (Spark Plasma Sintering) CNTs / TiB2-SiC ceramic composite material. The CNTs / TiB2-SiC ceramic composite material is a high-toughness thermal protection material with high temperature resistance, ablation resistance and thermal shock resistance, and can meet the demand of thermal protection materials of key parts of a hypersonic cruise vehicle.

Description

Technical field [0001] The invention belongs to the technical field of preparation of special ceramic materials, and relates to an ultra-high temperature CNTs / TiB 2 -SiC ceramic composite material and its preparation method. Background technique [0002] At this stage, heat protection materials are mainly divided into ablative and non-ablative types. With the development of high-speed, long-term and reusable hypersonic aircraft, higher requirements are put forward for the structural integrity of heat protection materials. , Low / micro ablation type heat protection materials represented by ultra-high temperature ceramic materials (UHTC) have become one of the primary candidates for heat protection materials for key parts of hypersonic aircraft in the future. Representative ZrB 2 Base and HfB 2 However, after nearly ten years of development, despite breakthroughs in temperature resistance and ablation, its thermal shock resistance has been restricting its development, and the fractu...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
Inventor 林佳张厚安黄羽廉冀琼杨益航
Owner XIAMEN UNIV OF TECH
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