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Method for preparing fiber reinforced ceramic matrix composite material

A fiber-reinforced, composite material technology, applied in the field of composite material preparation technology, can solve the problems of increasing the preparation cycle of fiber-reinforced ceramic matrix composite materials, limiting the scope of application, expensive weaving costs, etc., to reduce production costs, save time, and improve mechanization. Effect

Pending Publication Date: 2022-04-12
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the weaving of the fiber reinforced body of fiber reinforced ceramic matrix composites is mainly done by hand, which not only increases the preparation cycle of fiber reinforced ceramic matrix composites, but also greatly limits its application range due to its expensive weaving cost.

Method used

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  • Method for preparing fiber reinforced ceramic matrix composite material

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preparation example Construction

[0033] The process route of the method for preparing fiber-reinforced ceramic matrix composites of the present invention is as follows: figure 1 As shown, the specific steps are as follows:

[0034] Step 1, fiber pretreatment (fiber cleaning): There is often a thin layer of epoxy resin on the surface of the fiber, and its existence will affect the interface bonding strength between the fiber and the matrix material in the composite material. It is necessary to select a suitable fiber pretreatment process to remove the epoxy resin on the surface of the fiber and minimize the impact on the fiber strength. Boil the fiber with acetone for 36-48 hours, then replace with new acetone, continue to cook for 12-24 hours, and finally dry it in the explosion-proof room for 3-4 days.

[0035] Step 2, fiber impregnation: soak the fiber treated in step 1 in the sol (the density of the sol is 1.20~1.38g / cm 3 )2-5h to obtain fully impregnated fibers.

[0036] Step 3, fiber winding: accordin...

Embodiment 1

[0050] Boil the B-type quartz fiber with acetone for 36 hours, then replace with new acetone, continue to cook for 12 hours, and finally dry it in the explosion-proof room for 3-4 days; impregnate the cleaned quartz fiber with a density of 1.20g / cm 3 In the silica sol for 2 hours, completely impregnated fibers were obtained; according to the set winding procedure, the fibers were wound onto the mandrel of the round table through the winding machine; the wound samples were kept in an oven at 80°C for 12 hours; dried Put the good sample in the glue injection tank, the density is 1.25~1.32g / cm 3 Inject the silica sol into the tank, pressurize at 3.5-3.7MPa, and keep the pressure for 24 hours; after the pressure keeping, send the sample to an oven at 80°C for 12 hours; put the dried sample in the injection tank, and set the density 1.25~1.32g / cm 3 Inject the silica sol into the tank, pressurize at 3.5-3.7MPa, and keep the pressure for 24 hours; cool down, take off the mandrel use...

Embodiment 2

[0052] Boil Nextel720 alumina fiber with acetone for 36 hours, then replace with new acetone, continue to cook for 12 hours, and finally dry it in the explosion-proof room for 3-4 days; impregnate the cleaned alumina fiber in the 3 In the silica sol for 2 hours, completely impregnated fibers were obtained; according to the set winding procedure, the fibers were wound onto the plate-shaped mandrel by a winding machine; the wound samples were kept in an oven at 100°C for 12 hours; The dried sample is placed in the glue injection tank, and the density is 1.25 ~ 1.32g / cm 3 Inject the silica sol into the tank, pressurize at 3.5-3.7MPa, and keep the pressure for 24 hours; after the pressure keeping, send the sample to an oven at 80°C for 12 hours; put the dried sample in the injection tank, and set the density 1.25~1.32g / cm 3 Inject the silica sol into the tank, pressurize at 3.5-3.7MPa, and keep the pressure for 24 hours; cool down, take off the mandrel used for winding the sample...

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Abstract

The invention relates to a method for preparing a fiber reinforced ceramic matrix composite material. The method comprises the following steps: 1) pretreating fibers to remove epoxy resin on the surfaces of the fibers; 2) impregnating the pretreated fibers in the sol to obtain completely impregnated fibers; (3) winding the impregnated fibers on a core mold, and drying; 4) sequentially carrying out composite dipping, drying, composite dipping, drying and sintering on the dried sample piece; and 5) repeating the step 4) for multiple times to obtain the fiber reinforced ceramic matrix composite material. The ceramic-based composite material with high fiber volume content is prepared by combining a fiber winding process and a sol-gel method, so that the time can be saved, the mechanization can be improved, the production cost can be reduced, and the fiber volume content can be improved by changing the fiber type, the ceramic matrix, the particle size distribution and fiber orientation of sol for impregnation and a winding mode. The thermal mechanical property of the fiber reinforced ceramic matrix composite material is adjusted.

Description

technical field [0001] The invention relates to a novel method for preparing a fiber-reinforced ceramic matrix composite material, which belongs to the field of composite material preparation technology. Background technique [0002] Ceramic materials have excellent properties such as high melting point, low density, corrosion resistance, oxidation resistance and ablation resistance, and are widely used in special fields such as aerospace and military industry. However, the high brittleness and poor plasticity and toughness of ceramic materials lead to poor reliability during use, which restricts its application range. For this reason, continuous fiber reinforced ceramic matrix composites have been developed by adopting continuous fiber toughening method to improve its characteristics. Fiber-reinforced ceramic matrix composites overcome the shortcomings of brittle fracture of ceramic materials and improve the thermal shock resistance of the material; at the same time, they ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/82C04B35/80C04B35/14C04B35/185C04B35/622C04B35/624
Inventor 高文博崔凤单张剑吕毅赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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