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Submicron Al2O3 fibre and preparation method thereof

A sub-micron fiber technology, applied in the field of sub-micron Al2O3 fiber and its preparation, can solve the problems of environmental pollution, small whisker output, complicated process, etc., and achieve the effects of short holding time, low energy consumption and simple process

Inactive Publication Date: 2014-06-18
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this invention is complicated, pollutes the environment, and the output of whiskers is small

Method used

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  • Submicron Al2O3 fibre and preparation method thereof
  • Submicron Al2O3 fibre and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A submicron Al 2 o 3 Fibers and methods of making them. First mix 10~35wt% metal Al powder and 65~90wt% C powder as raw materials for 5~300min, then place them in a ceramic crucible, and calcinate in an inert atmosphere at 800~1100℃ for 2~5 hours, Cooling, and then calcining at 500-1000°C and air atmosphere for 1-3 hours to remove C and obtain submicron Al 2 o 3 fiber.

[0016] In this embodiment: the metal Al powder is analytically pure metal Al powder; the C powder is graphite powder; the inert atmosphere is an argon atmosphere.

[0017] The submicron Al prepared in this embodiment 2 o 3 The fiber diameter is 50nm~100nm.

Embodiment 2

[0019] A submicron Al 2 o 3 Fibers and methods of making them. Except raw material and inert atmosphere, all the other are the same as embodiment 1.

[0020] In this embodiment: the metal Al powder is chemically pure metal Al powder; the C powder is carbon black powder; the inert atmosphere is a nitrogen atmosphere.

[0021] The submicron Al prepared in this embodiment 2 o 3 The fiber diameter is 50nm~120nm.

Embodiment 3

[0023] A submicron Al 2 o 3 Fibers and methods of making them. Except raw material and inert atmosphere, all the other are the same as embodiment 1.

[0024] In this embodiment: the metal Al powder is industrial metal Al powder; the C powder is pitch powder; the inert atmosphere is an argon atmosphere.

[0025] The submicron Al prepared in this embodiment 2 o 3 The fiber diameter is 70nm~200nm.

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Abstract

The invention relates to a submicron Al2O3 fibre and a preparation method thereof. The technical proposal is as follow: 10-60wt% of metal Al powder and 40-90wt% of C powder are used as raw materials, mixed for 5-300min, then placed in ceramic crucible to be calcined for 2-8 hours in inert atmosphere at the temperature of 800-1400 DEG C, and cooled down; then the mixture is calcined for 1-3 hours in air atmosphere at the temperature of 500-1000 DEG C to obtain the submicron Al2O3 fibre. The metal Al powder is selected form more than one kind of analytical reagent of metal Al powder, chemically pure of metal Al powder and industrial metal Al powder, and the granularity is 1-100mum; C powder is selected form more than one kind of graphite powder, carbon black powder, asphalt powder and resin powder, and the granularity of C powder is smaller than 100mum; and the inert atmosphere is argon atmosphere or nitrogen atmosphere. The preparation method provided by the invention has the advantages of simple process and low energy consumption. The prepared submicron Al2O3 fibre not only is high in purity, but also is submicron grade, and is good for subsequent use as additives and reinforcing agents.

Description

technical field [0001] The invention belongs to Al 2 o 3 The field of fiber technology. In particular, a submicron Al 2 o 3 Fibers and methods of making them. Background technique [0002] Al 2 o 3 Fiber has superior comprehensive properties such as high specific strength, high specific modulus and high temperature oxidation resistance, and is one of the promising and potential reinforcing agents for high-performance composite materials, especially high-temperature structural ceramic materials. But since Al 2 o 3 The high sensitivity of the whisker growth process and the long-term failure of the practical technology make it practical since it came out in the 1950s. In recent years, with the rapid development of research on ceramic-based and metal-based whisker composites for high-temperature applications, the demand for high-temperature oxidation-resistant and high-strength whiskers has become increasingly urgent. [0003] "A method for preparing alumina whiskers" ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/42
Inventor 李享成朱伯铨张品为
Owner WUHAN UNIV OF SCI & TECH