Alumina fiber reinforced mullite ceramic-based composite material and preparation method thereof

An alumina fiber and composite material technology, which is applied in the field of fiber-reinforced ceramic composite materials, can solve the problems of no interface layer protection, low alumina powder sintering activity, and decreased mechanical properties of composite materials, and achieves a simple, easy, and excellent preparation method. High temperature mechanical properties and the effect of improving impregnation efficiency

Active Publication Date: 2022-04-29
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has some disadvantages: First, because the ceramic yield of organic precursor or sol is low, generally not more than 20wt%, it needs to go through more than 10 times of repeated impregnation-high temperature heat treatment, and multiple heat treatments will easily aggravate the thermal damage of alumina fibers , leading to a decrease in the mechanical properties of the composit

Method used

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  • Alumina fiber reinforced mullite ceramic-based composite material and preparation method thereof
  • Alumina fiber reinforced mullite ceramic-based composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] S1. Preparation of mullite slurry: add mullite powder, mullite sol and citric acid into a ball mill tank, add large and small balls, set the speed of the ball mill to 150rpm, and mill for 8 hours to obtain ceramic with a yield of 20wt%. Mullite slurry. The mass ratio of mullite powder, mullite sol and citric acid is 40:150:1, and the ceramic yield of mullite sol is 20wt%.

[0027] S2. Pretreatment of alumina fiber preform: Arrange alumina fiber satin in a muffle furnace, heat to 500°C for 3 hours, and cool down to room temperature naturally to obtain alumina fiber preform after removal of sizing agent.

[0028] S3, preparation of lanthanum phosphate interface layer: adopt existing preparation methods such as CN110983757A to prepare lanthanum phosphate precursor solution, after stirring and mixing lanthanum nitrate solution (0.4mol / L) and phosphoric acid solution (0.4mol / L) at 1°C, Obtain the lanthanum phosphate precursor solution; impregnate the alumina fiber preform f...

Embodiment 2

[0032] S1. Preparation of mullite slurry: add mullite powder, mullite sol and citric acid into a ball mill tank, add large and small balls, set the speed of the ball mill to 300rpm, and mill for 8 hours to obtain ceramic with a yield of 40wt%. Mullite slurry. The mass ratio of mullite powder, mullite sol and citric acid is 80:200:2, and the ceramic yield of mullite sol is 10wt%.

[0033] S2. Pretreatment of the alumina fiber preform: Arrange the alumina fiber twill in a muffle furnace, heat to 600°C for 1 hour, and cool down to room temperature naturally to obtain the alumina fiber preform after removing the sizing agent.

[0034] S3. Preparation of lanthanum phosphate interface layer: after stirring and mixing lanthanum nitrate solution (0.6mol / L) and phosphoric acid solution (0.6mol / L) at 2°C, a lanthanum phosphate precursor solution is obtained; The fiber prefabricated body was impregnated with the lanthanum phosphate precursor solution and reacted at 50°C for 2h, then it ...

Embodiment 3

[0038]S1. Preparation of mullite slurry: add mullite powder, mullite sol and citric acid into a ball mill tank, add large and small balls, set the speed of the ball mill to 500rpm, and mill for 8 hours to obtain ceramic with a yield of 60wt%. Mullite slurry. The mass ratio of mullite powder, mullite sol and citric acid is 100:100:3, and the ceramic yield of mullite sol is 15wt%.

[0039] S2. Pretreatment of alumina fiber preform: Arrange alumina fiber plain weave in a muffle furnace, heat to 550°C for 1.5h, and cool down to room temperature naturally to obtain alumina fiber preform after removal of sizing agent.

[0040] S3. Preparation of lanthanum phosphate interface layer: after stirring and mixing lanthanum nitrate solution (0.5mol / L) and phosphoric acid solution (0.5mol / L) at 1°C, a lanthanum phosphate precursor solution is obtained; The fiber prefabricated body was impregnated with the lanthanum phosphate precursor solution and reacted at 60°C for 1.5h, then it was take...

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Abstract

The invention discloses an alumina fiber-reinforced mullite ceramic-based composite material and a preparation method thereof, and relates to the technical field of fiber-reinforced ceramic composites.The method comprises the preparation steps of preparation of mullite slurry through ball milling, pretreatment of alumina fiber cloth, preparation of a lanthanum phosphate interface layer, vacuum-hot press molding and densification. And finally obtaining a finished product of the alumina fiber reinforced mullite ceramic-based composite material. The alumina fiber is used as a reinforcing phase to enhance the strength of the alumina matrix, the preparation process is simple, and the prepared finished product has excellent high-temperature mechanical properties.

Description

technical field [0001] The invention relates to the technical field of fiber-reinforced ceramic composite materials, in particular to an alumina fiber-reinforced mullite ceramic-based composite material and a preparation method thereof. Background technique [0002] Continuous alumina fiber reinforced mullite ceramic matrix composites have high temperature resistance, oxidation resistance, good mechanical properties, strength and heat insulation properties, can be used for a long time under high temperature conditions, and have a wide range of applications in aviation, aerospace, nuclear energy and other fields prospect. The three-dimensional fabric vacuum impregnation-drying-heat treatment forming process uses alumina fibers to be woven into fiber preforms, and then impregnated-drying. This method needs to pretreat the fabric to remove the sizing agent, then use the organic precursor solution or sol as the matrix for repeated impregnation-drying and densification, and fina...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/185C04B35/622
CPCC04B35/80C04B35/185C04B35/622C04B2235/5224C04B2235/447C04B2235/3227C04B2235/96C04B2235/77
Inventor 慈吉良刘一畅王茜张剑吕毅赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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