Alumina based long fiber containing mullite crystal phase, and preparation method thereof

A technology of alumina and mullite, applied in the field of alumina-based long fibers and their preparation, can solve the problems of damage to the comprehensive performance of fibers, unsuitable for industrial production, no continuity, etc., and achieve good tensile properties, low cost, Easy-to-prepare effects

Active Publication Date: 2012-02-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The FP-type fibers obtained by DuPont Company have large diameter and low strength, and are not suitable for industrial production; while the fibers obtained by ICI Company in the UK are short fibers without continuity; the Nextel s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example one

[0027] In this embodiment, an alumina-based long fiber containing mullite crystal phase, its crystal structure is composed of two crystal forms of mullite and alumina, of which the mullite crystal phase accounts for 2.6%, and the alumina crystal form is amorphous oxide Aluminum crystal form and α-alumina crystal form, and the two crystal forms have an arbitrary ratio, the primary fiber of the long fiber has an average diameter of 1 μm and a length of more than 31 m, and the fired fiber has a diameter of 0.5 μm and a length of 21 m.

[0028] In this embodiment, a method for preparing alumina-based long fibers containing mullite crystal phase includes the following steps:

[0029] Step 1: First change the molecular formula to: [Al 2 (OH) n Cl 6-n ] m , 02 O 3 The mass percentage content of the product is 20%, the PH value is 6, and the basicity is 30%-80%;

[0030] Step 2: First set the PH value to 1, and the contained SiO 2 Add 6.903ml of acidic silica sol with a ...

Example Embodiment

[0035] Example two

[0036] In this embodiment, an alumina-based long fiber containing mullite crystal phase, the crystal structure of which is composed of mullite crystal form, the average diameter of the primary fiber of the long fiber is 5μm, the length is more than 50m, the diameter of the fired fiber It is 3μm and the length is 35m.

[0037] In this embodiment, a method for preparing alumina-based long fibers containing mullite crystal phase includes the following steps:

[0038] Step 1: First change the molecular formula to: [Al 2 (OH) n Cl 6-n ] m , 02 O 3 The mass percentage content of the product is 25%, the PH value is 4, and the basicity is 30%-90%;

[0039] Step 2: First set the PH value to 2 and the SiO contained 2 Add 398 mL of acidic silica sol with a mass percentage of 20% and a particle size of 10 nm to the basic aluminum chloride sol prepared in step 1, and stir for 0.5 h to obtain a biphasic sol, and then add a polymerization degree of 1700 to the biphasic sol. 36...

Example Embodiment

[0044] Example three

[0045] In this embodiment, an alumina-based long fiber containing a mullite crystal phase has a crystal structure composed of two crystal forms of mullite and alumina, of which the mullite crystal form accounts for 99.9%, and the alumina crystal form is α-alumina The crystalline form of the long fiber has a primary fiber average diameter of 40 μm and a length of more than 150 m, and the fired fiber has a diameter of 30 μm and a length of 120 m.

[0046] In this embodiment, a method for preparing alumina-based long fibers containing mullite crystal phase includes the following steps:

[0047] Step 1: First change the molecular formula to: [Al 2 (OH) n Cl 6-n ] m , 02 O 3 The mass percentage content of the product is 20%, the PH value is 6, and the basicity is 60%-90%;

[0048] Step 2: First, set the PH value to 3.5 and the contained SiO 2 Add 736 mL of acidic silica sol with a mass percentage of 25% and a particle size of 20 nm to the basic aluminum chloride sol...

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Abstract

The invention relates to a preparation method for alumina based long fiber containing a mullite crystal phase. The preparation method comprises preparing a basic aluminum chloride sol, a precursor sol, a spinnable sol, original alumina based long fiber and the alumina based long fiber containing the mullite crystal phase, and has advantages of easy preparation and low cost. The prepared long fiber has advantages of long length, small diameter, high strength and good softness.

Description

technical field [0001] The invention relates to a reinforcing body of a composite material, in particular to an alumina-based long fiber containing mullite crystal phase and a preparation method thereof. Background technique [0002] Alumina-based long fiber is a high-performance ceramic fiber, its main components are alumina and silica, and its main forms are short fiber, long fiber and fiber aggregate. At present, publicly reported companies that prepare alumina-based long fibers include 3M’s Nextel series of long fibers, DuPont’s FP and PRD-166 series of long fibers, Japan’s Sumitomo’s Altex series and Sumica series of continuous fibers, and British ICI company The Saffil series of staple fibers. The fiber preparation methods are also different, such as DuPont's FP fiber, which uses 15 μm α-Al 2 o 3 Micropowder and Al 2 (OH) 5 Cl 2H 2 O and a small amount of MgCl 2 It is formulated into a gel solution, and after reaching a certain viscosity, it is spun into contin...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/185C04B35/622
Inventor 杨建锋杭勇张海鸥丁亚平林光李春芳鲍崇高韩志海
Owner XI AN JIAOTONG UNIV
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