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Preparation method of alumina fiber reinforced ceramic matrix composite material containing alumina interface layer

A technology of alumina fiber and composite materials, which is applied in the field of alumina fiber reinforced ceramic composite materials, can solve the problems of high brittleness of alumina fibers, high preparation cost, and large fiber damage, etc., achieve simple and easy preparation methods, and improve mechanical properties , Reduce the waste of broken yarn

Active Publication Date: 2022-05-03
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to weave continuous alumina fibers into three-dimensional fabrics in advance. Because alumina fibers are brittle and easy to break, the weaving process will cause great damage to the fibers, the utilization rate of alumina fibers is low, and the subsequent densification process of composite materials is complicated, resulting in It is expensive to prepare
In addition, due to the steric hindrance effect of the fiber, it is difficult for the alumina sol to penetrate into the interior of the fabric, resulting in poor uniformity of the interface layer on the surface of the fabric, thereby affecting the mechanical properties of the composite material.

Method used

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  • Preparation method of alumina fiber reinforced ceramic matrix composite material containing alumina interface layer
  • Preparation method of alumina fiber reinforced ceramic matrix composite material containing alumina interface layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] S1. Preparation of alumina sol: Add pseudoboehmite powder and ultrapure water into a three-necked flask, place it in an oil bath, set the heating temperature of the oil bath, heat and stir for 1 hour, then slowly add dilute Nitric acid solution, adjust the pH to 2.5-3.5, continue heating and stirring for 4 hours to obtain an alumina sol with a solid content of 8 wt%. The mass ratio of pseudo-boehmite powder and ultrapure water is 10:100, the heating reaction temperature is 85°C, and the concentration of dilute nitric acid is 1mol / L.

[0033] S2. Pretreatment of alumina fibers: put alumina fibers (the raw material is alumina as the main component, and other components include mullite, silica, boria) in a pressure vessel, pour ultrapure water, and heat to After 24 hours of heat preservation at 85°C, the alumina fibers were taken out, and dried naturally at room temperature to obtain continuous alumina fibers after removing the sizing agent.

[0034] S3. Winding molding p...

Embodiment 2

[0037] S1. Preparation of alumina sol: Add pseudo-boehmite powder and ultrapure water into a three-necked flask, place it in an oil bath, set the heating temperature of the oil bath, fully heat and stir for 2 hours, then slowly add dilute Nitric acid solution, adjust the pH to 2.5-3.5, continue heating and stirring for 3 hours to obtain an alumina sol with a solid content of 5 wt%. The mass ratio of pseudo-boehmite powder and ultrapure water is 15:100, the heating reaction temperature is 70°C, and the concentration of dilute nitric acid is 1mol / L.

[0038] S2. Pretreatment of alumina fiber: put the alumina fiber in a pressure vessel, pour ultrapure water into it, heat to 80°C, take out the alumina fiber after keeping it warm for 20 hours, and dry it naturally at room temperature to obtain the removal of the sizing agent After continuous alumina fiber.

[0039] S3. Winding molding preparation of alumina fiber reinforced ceramic matrix composites containing alumina interface la...

Embodiment 3

[0042]S1. Preparation of alumina sol: Add pseudoboehmite powder and ultrapure water into a three-necked flask, place it in an oil bath, set the heating temperature of the oil bath, fully heat and stir for 4 hours, then slowly add dilute Nitric acid solution, adjust the pH to 2.5-3.5, continue heating and stirring to react, and obtain an alumina sol with a solid content of 10wt% in 2 hours. The mass ratio of pseudo-boehmite powder and ultrapure water is 20:100, the heating reaction temperature is 90°C, and the concentration of dilute nitric acid is 1mol / L.

[0043] S2. Pretreatment of alumina fibers: put the alumina fibers in a pressure vessel, pour ultrapure water, heat to 80°C, take out the alumina fibers after 18 hours of heat preservation, and dry naturally at room temperature to obtain the removal of the sizing agent After continuous alumina fiber.

[0044] S3. Winding molding preparation of alumina fiber reinforced ceramic matrix composites containing alumina interface l...

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Abstract

The invention discloses a preparation method of an alumina fiber reinforced ceramic matrix composite material containing an alumina interface layer, and relates to the technical field of alumina fiber reinforced ceramic composite materials. An acid hydrolysis method is used to prepare alumina sol, and the alumina fiber is pretreated to remove After the impregnating agent, the impregnated alumina sol is wound onto the mandrel for molding, followed by repeated impregnation of the oxide sol and drying-heat treatment to obtain a composite material. The method omits the weaving forming process of the fiber prefabricated body, adopts the winding forming method, and prepares the alumina fiber reinforced ceramic matrix composite material in one step, thereby reducing the waste of broken yarn in the weaving process of the fiber. An alumina interface layer is formed between the alumina fiber and the oxide matrix, which effectively reduces the bonding strength between the fiber and the matrix, exerts the toughening and strengthening effect of the fiber, and improves the mechanical properties of the composite material. The preparation method provided by the invention has the advantages of simplicity, low cost, no pollution and the like.

Description

technical field [0001] The invention relates to the technical field of alumina fiber-reinforced ceramic composite materials, in particular to a preparation method of alumina fiber-reinforced ceramic-based composite materials containing an alumina interface layer. Background technique [0002] The continuous alumina fiber reinforced oxide ceramic matrix composite material has high temperature resistance, oxidation resistance, good mechanical strength and heat insulation performance, and can be used for a long time at 1200 ° C. This material can replace the poor strength and toughness under high temperature oxidative conditions. Metal materials and non-oxide-based ceramic composite materials meet the application requirements of a new generation of aerospace vehicles and aero-engines, and have broad application prospects in aviation, aerospace, nuclear energy and other fields. Fiber-reinforced oxide composites tend to have a strong bond between the fiber and the matrix under hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B41/87C04B35/64B29C70/34
CPCC04B41/87C04B41/5031C04B35/64B29C70/34C04B2235/6562C04B41/4584C04B41/0072
Inventor 慈吉良吴焘张剑吕毅赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH