Carbon nano tube (CNT) toughened TiAl/B4C ceramic matrix composite and preparation method thereof

A technology of carbon nanotubes and composite materials, which is applied in the field of engineering ceramic materials, can solve the problems of large grain boundary movement resistance, low surface tension, and high brittleness, and achieve the effects of low price, excellent toughness, and excellent performance

Inactive Publication Date: 2011-01-12
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The covalent bond ratio of boron carbide is as high as 93.94%, much higher than that of other common ceramics, such as SiC (88%), Al2O3 (37%), ZrO2 (49%), etc., so its plasticity is poor, and the grain boundary movement resistance is very large , the surface tension in the solid state is very small, which determines that boron carbide is extremely difficult to sinter, such as sintering at 2300 ° C under normal pressure, usually only a relative density of less than 85% can be obtained
Moreover, the strong covalent bond of boron carbide also causes its low fracture toughness and high brittleness, which is its biggest weakness.

Method used

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  • Carbon nano tube (CNT) toughened TiAl/B4C ceramic matrix composite and preparation method thereof
  • Carbon nano tube (CNT) toughened TiAl/B4C ceramic matrix composite and preparation method thereof
  • Carbon nano tube (CNT) toughened TiAl/B4C ceramic matrix composite and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] Carbon nanotube toughened TiAl / B4C ceramic matrix composite material, which is composed of carbon nanotubes, Ti-Al intermetallic compounds and B4C, the composition ratio (weight ratio) of the material is: carbon nanotubes 5%, Ti- Al intermetallic compound 20%, B4C 75%. Its preparation method is as follows: first, with Ti powder 16.8g, Al powder 3.2g and stearic acid 0.6g (ball milling aid, addition is 3% of total mass) in high-energy ball mill ball mill 30 hours, then under vacuum or nitrogen Heat treatment at 600°C under protection to form a Ti-Al intermetallic compound with the main crystal phase Ti3Al; surface oxidation treatment of carbon nanotubes is carried out with concentrated nitric acid at 60°C in conjunction with ultrasonic dispersion. Then, the Ti3Al obtained by mechanical alloying was uniformly mixed with 5 g of surface-treated carbon nanotubes and 75 g of B4C powder for 3 hours. Finally, put the mixture into a graphite mold, pressurize 30Mpa at a temperat...

Embodiment 2

[0039]The mass percentage of each component is: carbon nanotube 2%, Ti-Al intermetallic compound 30%, B4C 68%. Its preparation method is as follows: first, with Ti powder 19.1g, Al powder 10.4g, molybdenum powder 0.5g and stearic acid 1.5g (ball milling aid, add-on is 5% of total mass) in high-energy ball mill ball mill 30 hours, Then heat treatment at 600°C under vacuum or nitrogen protection to form a Ti-Al intermetallic compound (containing a small amount of Ti3Al) in the main crystal phase TiAl; the surface oxidation treatment of carbon nanotubes is carried out with concentrated nitric acid at 60°C and with ultrasonic dispersion. Then, the TiAl obtained by mechanical alloying, 2 g of surface-treated carbon nanotubes and 65 g of B4C powder were uniformly mixed for 3 hours. Finally, put the mixture into a graphite mold, pressurize 30Mpa at a temperature of 1580°C, and sinter by hot pressing under vacuum or nitrogen protection.

Embodiment 3

[0041] Carbon nanotube toughened TiAl / B4C ceramic matrix composite material, which is composed of carbon nanotubes, Ti-Al intermetallic compounds and B4C, the composition ratio (weight ratio) of the material is: carbon nanotubes 5%, Ti- Al intermetallic compound 20%, B4C 75%. Oxidation treatment of carbon nanotubes is carried out with concentrated nitric acid at 60°C in combination with ultrasonic dispersion. Its preparation method is as follows: 16.8g of Ti powder, 3.2g of Al powder, 75g of B4C powder and 2.94g of stearic acid (a ball milling aid, the addition amount is 3% of the total mass) are ball milled in a high-energy ball mill for 20 hours. Finally, add 5g of carbon nanotubes that have undergone surface oxidation treatment, and carry out uniform mixing for 3 hours. Finally, put the mixed material into a graphite mold, pressurize 30Mpa at a temperature of 1600°C, and heat press and sinter under vacuum or nitrogen protection conditions. , Preparation of carbon nanotube ...

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Abstract

The invention relates to a high-strength light ceramic matrix composite applied to abyssal environment and a preparation method thereof. The composite consists of three parts: CNT, Ti-Al intermetallic compound and B4C. The preparation method comprises the steps of preparing Ti-Al intermetallic compound powder from titanium powder, aluminum powder and microelement additive through a mechanical alloying technology, then mixing the Ti-Al intermetallic compound powder with the CNT and the B4C powder to prepare powder, and performing hot pressing to the powder for shaping under protective atmosphere. The invention utilizes the advantages of the intermetallic compound and a ceramic material to make up the disadvantages, and performs toughening via the CNT, so as to develop and prepare the high-strength light ceramic matrix composite applied to the abyssal environment.

Description

technical field [0001] The invention belongs to the field of engineering ceramic materials, and relates to a high-strength and light-weight ceramic-based composite material used in a deep-sea environment and a preparation method thereof. Specifically, the invention relates to carbon nanotube toughened TiAl / B4C ceramic matrix composite material and a preparation method thereof. Background technique [0002] The deep seabed not only contains rich mineral resources such as oil, natural gas and natural gas hydrate, metal nodules, hydrothermal sulfide (rich in copper, iron, zinc and a small amount of lead, silver, gold, cobalt and other metals), but also has Extreme life phenomenon (genetic resources of deep-sea organisms). Therefore, with the increasing tension of terrestrial energy, it is urgent to develop deep-sea exploration and resource development technologies to realize the strategic goals of understanding the deep-sea environment, utilizing deep-sea resources, and achiev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/02C22C47/14C22C101/10
Inventor 董丽华范艳华尹衍升
Owner SHANGHAI MARITIME UNIVERSITY
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