Aluminiferous silicon carbide fiber and preparation method thereof

A technology of aluminum silicon carbide and fiber, which is applied in the field of aluminum-containing silicon carbide fiber and its preparation, which can solve the problems of fiber strength reduction and temperature sensitivity of SiC fiber high temperature treatment, so as to inhibit growth, improve normal temperature mechanical properties and high temperature stability Effect

Active Publication Date: 2018-06-22
江西信达航科新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of SiC fiber is very sensitive to high temperature treatment temperature; it is generally believed that at high temperature, as the temperature rises, obvious holes and microcracks appear inside the SiC fiber, so that the fiber strength drops sharply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The invention provides a method for preparing aluminum-containing silicon carbide fibers, comprising the following steps:

[0024] S101: Grinding of aluminum isopropoxide

[0025] Put aluminum isopropoxide into a ball mill to grind for 24-48 hours, pass through an 800-mesh sieve after drying, then heat to 128-132°C, and stir well until it is completely melted.

[0026] S102: Preparation of aluminum sol

[0027] Take distilled water and pour it into a three-necked flask, heat it to 85-95°C, slowly add molten aluminum isopropoxide and let it stand for 1-2 hours, then stir it openly for 2-4 hours to obtain a white precipitate; then add nitric acid or hydrochloric acid dropwise to adjust the pH range 2.0 to 3.0, reflux aging for 24 hours, and a transparent aluminum sol was obtained.

[0028] S103: impregnated aluminum sol

[0029] Immerse the melt-spun product in aluminum sol for 30-40 minutes, take it out and dry it in the air at 60-80°C until completely dried. Among t...

Embodiment 1

[0036] This embodiment provides a method for preparing aluminum-containing silicon carbide fibers, comprising the following steps:

[0037] S101: Grinding of aluminum isopropoxide

[0038] Put 100g of aluminum isopropoxide into a ball mill to grind for 48 hours, pass through a 800-mesh sieve after drying, then heat to 132°C, and stir well until it is completely melted.

[0039] S102: Preparation of aluminum sol

[0040] Take 1000g of distilled water and pour it into a three-neck flask, heat it to 85°C, slowly add molten aluminum isopropoxide and let it stand for 2 hours, then stir for 2 hours in the open to obtain a white precipitate; then add hydrochloric acid dropwise, adjust the pH range to 2.0, and age for 24 hours under reflux , to obtain a transparent aluminum sol.

[0041] S103: impregnated aluminum sol

[0042] Immerse the melt-spun product in aluminum sol for 30 minutes, take it out and dry it in the air at 60°C until it is completely dried. Among them, the prepar...

Embodiment 2

[0048]This embodiment provides a method for preparing aluminum-containing silicon carbide fibers, comprising the following steps:

[0049] S101: Grinding of aluminum isopropoxide

[0050] Put 100g of aluminum isopropoxide into a ball mill to grind for 48 hours, pass through a 800-mesh sieve after drying, then heat to 130°C, and stir well until it is completely melted.

[0051] S102: Preparation of aluminum sol

[0052] Take distilled water and pour it into a three-necked flask, heat it to 95°C, slowly add molten aluminum isopropoxide and let it stand for 1 hour, then stir for 4 hours in the open to obtain a white precipitate; then add nitric acid dropwise, adjust the pH range to 3.0, and age under reflux for 24 hours. A transparent aluminum sol was obtained.

[0053] S103: impregnated aluminum sol

[0054] Immerse the melt-spun product in aluminum sol for 40 minutes, take it out and dry it in the air at 80°C until it is completely dried. Among them, the preparation method ...

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Abstract

The invention relates to an aluminiferous silicon carbide fiber and a preparation method of the silicon carbide fiber. The method comprises the following steps of: S101: grinding aluminum isopropoxide, heating to a molten state, S102: adding aluminum isopropoxide in the molten state into hot water for uniform stirring and standing, regulating a pH (potential of hydrogen) value of a solution afterthe standing to 2.0-3.0, and performing backflow ageing to form aluminum collosol, S103: soaking a melt spinning product in the aluminum collosol, and then taking out and drying the product, S104: performing infusibility treatment on a product obtained in S103, and S105: performing high-temperature sintering on a product obtained in S104, and obtaining the aluminiferous silicon carbide fiber at last. In a preparation process of the silicon carbide fiber, an Al element is introduced by a physical method; the method is simple in technology, has no adverse effect on an environment; and the prepared aluminiferous silicon carbide fiber is high in strength, large in modulus and stable in high temperature property, and has good application prospects in the high temperature field of aerospace, weaponry and the like.

Description

technical field [0001] The invention relates to the technical field of high-performance fibers, in particular to an aluminum-containing silicon carbide fiber and a preparation method thereof. Background technique [0002] Due to its high strength, high modulus, and excellent high temperature resistance, silicon carbide (SiC) fibers have extremely broad application prospects in high-end fields such as aerospace and weaponry. The development level of silicon carbide fiber reflects the military strength and comprehensive strength of a country to a certain extent. Therefore, silicon carbide fiber has always been an embargoed item from Western countries to my country, and the preparation technology of silicon carbide fiber is a military secret of Western countries. Breaking through the technology monopoly of western countries, realizing the independent production of silicon carbide fibers, and improving the performance of existing silicon carbide fibers are an important means to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10D06M11/45D06M101/30
CPCD01F9/10D06M11/45D06M2101/30
Inventor 吴宝林侯振华
Owner 江西信达航科新材料科技有限公司
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