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A method for enhancing the performance of alumina flexible fibers

A flexible fiber, alumina technology, applied in the field of fiber materials, can solve the problems of decreased toughness, affecting the mechanical properties of alumina flexible fibers, and decreasing the mechanical properties of alumina flexible fibers.

Active Publication Date: 2021-09-14
山东东珩国纤新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the preparation process of the existing preparation method, microcracks will appear in the gel spinning equipment and the sintering process, which will affect the mechanical properties of the alumina flexible fiber.
And when the use temperature of the alumina flexible fiber reaches above 1350 degrees, the mechanical properties of the alumina flexible fiber will decrease, especially the toughness will decrease significantly.

Method used

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  • A method for enhancing the performance of alumina flexible fibers
  • A method for enhancing the performance of alumina flexible fibers
  • A method for enhancing the performance of alumina flexible fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] (1) Synthesis of nano-SiO in situ on the surface of alumina flexible fibers 2 film

[0072] (1.1) purifying the fiber surface: alumina fibers into the flexible alcohol sonicated for 1 hour and thoroughly dried;

[0073] (1.2) Preparation of polymer solution: Take TEOS 10g, 250g propanol were mixed to L- arginine as catalyst modifiers and pH adjusted to pH 8.5, stirred for 20 minutes;

[0074] (1.3) in-situ polymerization: The polymerization solution fiber of step (1.1) is immersed in the step (1.2), the duration 2 hours;

[0075] (1.4) after the step (1.3) the reaction of alumina fibers rapid drying in an oven, drying temperature at 120 ℃, drying time 10 minutes.

[0076] (2) Heat treatment: flexible fibrous alumina is placed in a sintering furnace, at 10 ℃ / min heating rate was raised to 650 ℃, and then naturally cooled. After the heat-treated alumina flexible fibers quickly rinsed percent concentration of 15 seconds with 1.5% by mass of hydrofluoric acid, and rinse with ...

Embodiment 2

[0083] (1) Synthesis of nano-SiO in situ on the surface of alumina flexible fibers 2 film

[0084] (1.1) purifying the fiber surface: alumina fibers into the flexible alcohol sonicated for 2 hours and sufficiently dried;

[0085] (1.2) Preparation of polymer solution: Take TEOS 20g, 250g propanol were mixed to L- arginine as catalyst modifiers and pH was adjusted to pH 9, stirred for 20 minutes;

[0086] (1.3) in-situ polymerization: The polymerization solution fiber of step (1.1) is immersed in the step (1.2), the last 3 hours;

[0087] (1.4) after the step (1.3) the reaction of alumina fibers in an oven fast drying, drying temperature of 130 ℃, drying time 15 minutes.

[0088] (2) Heat treatment: flexible fibrous alumina is placed in a sintering furnace, at 10 ℃ / min heating rate was raised to 750 ℃, and then naturally cooled. After the heat-treated alumina flexible fibers quickly rinsed percent concentration of 15 seconds with 1.5% by mass of hydrofluoric acid, and rinse with ...

Embodiment 3

[0094] (1) Synthesis of nano-SiO in situ on the surface of alumina flexible fibers 2 film

[0095] (1.1) purifying the fiber surface: alumina fibers into the flexible alcohol sonicated for 1 hour and thoroughly dried;

[0096] (1.2) Preparation of polymer solution: Take acidic silica sol solid content of 30%, a catalyst and ammonia as pH adjusting agents, pH was adjusted to 6, stirred for 20 minutes, the standby;

[0097] (1.3) in-situ polymerization: The polymerization solution fiber of step (1.1) is immersed in the step (1.2), the duration 2 hours;

[0098] (1.4) after the step (1.3) the reaction of alumina fibers rapid drying in an oven, drying temperature at 120 ℃, drying time 30 minutes.

[0099] (2) Heat treatment: flexible fibrous alumina is placed in a sintering furnace, at 10 ℃ / min heating rate was raised to 650 ℃, and then naturally cooled. After the heat-treated alumina flexible fibers quickly rinsed percent concentration of 15 seconds with 1.5% by mass of hydrofluori...

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Abstract

The invention provides a method for enhancing the performance of alumina flexible fibers, comprising the following steps: (1) in-situ synthesis of nano-SiO 2 Thin film: Rapid hydrolysis and condensation on the surface of alumina flexible fibers under the action of silicon source and catalyst to form SiO 2 Nanoparticles; (2) performing heat treatment and surface roughening treatment on the alumina flexible fiber obtained in step (1); (3) performing polymer coating and heat curing treatment on the alumina flexible fiber treated in step (2). The method of the invention can improve the strength of the fiber and maintain good mechanical properties of the alumina flexible fiber at high temperature; at the same time, it can repair the microcracks that appear in the preparation process and further increase the mechanical properties of the fiber.

Description

Technical field [0001] The present invention belongs to the technical field of fiber materials, particularly relates to a method of enhancing the performance of flexible fibrous alumina. [0002] technical background [0003] Alumina fibers are high performance flexible inorganic fiber, the main component is aluminum oxide (A1 2 O 3 ), Also contains a certain amount of additives, such as silica, boron oxide, iron oxide, zirconium oxide, magnesium oxide and the like, and specific form of chopped fibers, whiskers, etc., and the flexible fibers. [0004] Alumina has a high temperature flexible fibers in addition, the characteristics of high strength, but also has strong corrosion resistance, thermal shock resistance, good thermal insulation performance, small size, light weight and resistance to mechanical shock, etc., is a comprehensive performance excellent engineering materials, can be used as ceramic, metal, plastic and other enhanced ingredients, it plays an important role in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/79D06M15/564D06M13/513D06M13/148D06M15/61D06M13/188D06M15/55D06M15/333
CPCD06M11/79D06M13/148D06M13/188D06M13/513D06M15/333D06M15/55D06M15/564D06M15/61
Inventor 井良霄郭文勇范宗忠
Owner 山东东珩国纤新材料有限公司
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