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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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  • Summary
  • 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 composite
Second, the process cycle is long, the efficiency is low, and the process cost is high
However, the sintering activity of alumina powder is low, and the bonding between particles is weak; in addition, without the protection of the interface layer, the fiber is easy to react with the matrix under high temperature conditions, resulting in a decrease in the performance of the composite material

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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