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Mullite fiber with villous whisker and preparation method thereof

A mullite fiber and fluffy technology, which is applied in the field of polycrystalline mullite fiber structure and preparation technology, can solve the problems of lack of research and achieve the effects of simple process, increased specific surface area and excellent performance

Active Publication Date: 2014-03-05
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whiskers are grown on the surface of the fiber to obtain the mullite fiber with a special structure, and the relevant research on the structure-functional integrated material is still relatively lacking.

Method used

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  • Mullite fiber with villous whisker and preparation method thereof
  • Mullite fiber with villous whisker and preparation method thereof
  • Mullite fiber with villous whisker and preparation method thereof

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Embodiment Construction

[0030] see figure 1 , The mullite fiber with fluffy whiskers of the present invention has radial whiskers distributed on the surface, and grows outward from the fiber center axis line as the origin. The whiskers on the fiber surface are mullite single crystals, with a diameter of 100-550 nm and a length of 1.5-7 μm. The main phase of the fiber is mullite phase, or contains a small amount of corundum phase, and the proportion of corundum phase is 0-18wt.%. The diameter of the mullite fiber (including the surface whisker part) is 4.1-56 μm. The natural length of the fibers is greater than 3 mm. from figure 1 It can be seen from the figure that the fine whiskers on the surface of the fiber are densely distributed three-dimensionally, which are nano-whiskers distributed radially, which greatly increases the specific surface area of ​​the fiber.

[0031] A method for preparing mullite fibers with fluffy whiskers, comprising the steps of:

[0032] (1) Mix liquid basic aluminum ...

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Abstract

The invention discloses a mullite fiber with villous whisker and a preparation method thereof. The mullite fiber is characterized in that the surface of the fiber is distributed with radial whiskers, which grow, with central axis as origin, towards the outside of the fiber. The whiskers on the fiber surface are mullite monocrystal. The invention first employs a sol-gel method to prepare mullite fiber with good continuity; then the gel fibers, nano aluminum oxide powder, nano silicon oxide powder and a catalyst are sintered together in a closed container to 1150-1350 DEG C, so that the fibers are crystallized, and monocrystal mullite whiskers grow in a radial pattern on the surface. The invention has the advantages of simple preparation process, and the obtained fiber has unique structure and excellent performance, and is suitable for usage as a structure function integrated material.

Description

technical field [0001] The invention relates to a polycrystalline mullite fiber structure and a preparation process that can be used for composite material reinforcement and toughening, skeleton or carrier material with large specific surface area. Background technique [0002] In SiO 2 ~Al 2 o 3 In the binary system, mullite is the only stable crystalline compound. Mullite has many excellent physical and chemical properties. For example, mullite has strong thermal shock resistance. Kaya et al. used mullite fiber-reinforced mullite-based composites. After 300 thermal cycles between 1150 ° C and room temperature, the sample had no obvious cracks, and its strength was 201 MPa (the strength at room temperature was 235 MPa). Mullite also has high high temperature strength and low creep. Osendi et al. found that the flexural strength of mullite at 1400 ° C was 240 MPa, which was higher than its 230 MPa at room temperature. Its Young's modulus begins to decrease slightly af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D01F11/00D01D1/02
Inventor 杨建锋张海鸿林光王波王继平史忠旗王红洁
Owner XI AN JIAOTONG UNIV