Composite toughening material of nanometer carbon pipe/nanometer zirconium exide and its preparation method

A composite toughening material, nano-zirconia technology, which is applied in the field of carbon nanotube/nano-zirconia composite toughening material and its preparation, can solve the problems that have not been found in the relevant reports of CNTs/nano-zirconia composite toughened ceramic materials, etc. To achieve the effect of improving fracture toughness

Inactive Publication Date: 2006-01-25
TSINGHUA UNIV
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Problems solved by technology

[0005] So far, no other relevant reports on CNTs/nano z...

Method used

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  • Composite toughening material of nanometer carbon pipe/nanometer zirconium exide and its preparation method
  • Composite toughening material of nanometer carbon pipe/nanometer zirconium exide and its preparation method
  • Composite toughening material of nanometer carbon pipe/nanometer zirconium exide and its preparation method

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preparation example Construction

[0025] 1. Preparation of CNTs suspension:

[0026] The CNTs prepared by the chemical vapor deposition method were boiled in HF for 2 hours to remove the amorphous carbon on the surface of the CNTs, and washed with water until pH=7-7.5. Add the acid boiled CNTs to deionized water, add 0.1-0.6% surfactant corresponding to the mass of deionized water, and ultrasonically disperse.

[0027] 2. Preparation of CNTs / zirconium hydroxide

[0028] Add zirconium chloride to the CNTs suspension, and its concentration can be adjusted according to the actual needs, according to the amount of CNTs in the CNTs aqueous suspension, ranging from ZrCl 4 The mass ratio of CNTs to CNTs is preferably 4-40. When more zirconium chloride is added, the prepared nano-zirconia particles will be more, on the contrary, there will be less zirconium oxide particles; add enough concentrated ammonia water while stirring rapidly, and a large amount of zirconium hydroxide will be formed instantly gel:

[0029...

Embodiment 1

[0038] Add 0.5g of CNTs to 100ml of deionized water, add 0.1g of sodium dodecylsulfonate, and sonicate for 15min. Add 2g of zirconium chloride to the CNTs slurry and fully dissolve it. Quickly pour 20% concentrated ammonia water until no new precipitates are produced, and a large amount of zirconium hydroxide gel is formed. Filter and wash with water until neutral, dry in an oven at 100°C to remove crystal water. The XRD pattern of CNTs / zirconium hydroxide shows that zirconium hydroxide is amorphous (see Figure 2a ), SEM showed that the zirconium hydroxide particles were about 2-5nm. CNTs / zirconium hydroxide was heated in a tubular resistance furnace at 550° C. under the protection of an argon atmosphere for 3 hours, and then cooled with the furnace temperature to obtain CNTs / nanometer zirconia materials. The XRD pattern showed that zirconia had a cubic crystal structure (see Figure 2b ). High-resolution transmission electron microscopy (HRTEM) detection results (se...

Embodiment 2

[0040] Add 0.15g of CNTs to 100ml of deionized water, add 0.3g of dodecyloxyamine, and sonicate for 15min. Add 4g of zirconium chloride to the CNTs slurry and fully dissolve it. Quickly pour 20% concentrated ammonia water until no new precipitates are produced, and a large amount of zirconium hydroxide gel is formed. Filter and wash with water until neutral, dry in an oven at 200°C to remove crystal water. The XRD pattern of CNTs / zirconium hydroxide shows that zirconium hydroxide is amorphous, and SEM shows that the zirconium hydroxide particles are about 10nm. The CNTs / zirconium hydroxide was heated in a tubular resistance furnace at 600°C under the protection of argon atmosphere for 2h, and then cooled with the furnace temperature to obtain the CNTs / nano-zirconia material. The XRD pattern showed that the zirconium oxide had a cubic crystal structure. High-resolution transmission electron microscopy (HRTEM) detection results (see Figure 1c ) shows that the particle ...

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Abstract

The invention provides a carbon nano tube / nano zirconium oxide composite toughening material and its preparing process, wherein the material is CNTs with nano zirconium oxide particles adhered on the surface, and the preparing process comprises, preparing CNTs suspending liquid, charging zirconium source and strong base to form CNTs / zirconium hydroxide colloid, heating the CNTs / zirconium hydroxide colloid to dehydrate the colloid, then transforming zirconium hydroxide into zirconium oxide under high temperature protection state, finally obtaining the carbon nano tube / nano zirconium oxide composite toughening material with controllable nano grade grain diameter, when used for alumina ceramics, the fracture toughness property can be improved appreciably.

Description

Technical field: [0001] Carbon nanotube / nano zirconia composite toughened material and preparation method thereof belong to improvement of fracture toughness of ceramic materials such as alumina [0002] technology field. Background technique: [0003] Since carbon nanotubes (CNTs) were first discovered by Japanese scholar Iijima in 1991, due to their unique structure and excellent physical properties, their application research in engineering materials has quickly become a hotspot. Among them, in the field of composite materials, CNTs have been Widely used in the modification of composite materials. Zirconia is a traditional toughening material for alumina ceramics, and CNTs have only been used for toughening alumina ceramics in recent years, but there is no report of depositing zirconia on the surface of CNTs as a composite toughening material. [0004] The present inventors have prepared CNTs-modified alumina ceramic composite materials by using the heterocoagulation me...

Claims

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Application Information

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IPC IPC(8): C04B35/628C04B35/52
Inventor 朱跃峰石磊梁吉
Owner TSINGHUA UNIV
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