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A method for increasing the density of large-thickness fiber-reinforced quartz composites

A fiber-reinforced, composite material technology, applied in the direction of silica, silicon oxide, etc., can solve the problems of difficulty in increasing the density of composite materials, and the mechanical properties of fiber-reinforced quartz composite materials cannot meet high-strength properties, and achieve improved shear performance and cost. Low, enhanced interface effect

Active Publication Date: 2020-06-16
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For fiber preforms with a large thickness (more than 40mm), after multiple impregnations, it is difficult for silica sol to enter the pores inside the composite material, and it is difficult to increase the density of the composite material
The mechanical properties of fiber-reinforced quartz composites cannot meet the increasing requirements for high-strength properties

Method used

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  • A method for increasing the density of large-thickness fiber-reinforced quartz composites

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The needle-punched quartz fiber-reinforced quartz composite material (80mm thick) with a density of 1.50g / cm 3 , compressive strength 44MPa, shear strength 5.0MPa.

[0030] prepared as figure 1 shown in the following steps:

[0031] 1. Activate the benzenesulfonic acid type strong acid cation exchange resin with 1M hydrochloric acid solution 8 times the volume of the resin, and rinse the exchange column with water 8 times the volume of the resin.

[0032] 2. After diluting the industrial-grade water glass solution to a concentration of 5 wt %, ion exchange is performed through an ion exchange column, and the effluent with a pH value of less than 4 is collected.

[0033] 3. Place the composite material as the original base material in the collected orthosilicic acid solution and soak for 10 hours.

[0034] 4. Take out the composite material, drain and dry at 300°C for 1 hour.

[0035] 5. Repeat steps 1 to 4 four times.

[0036] 6. Sinter the composite material at 80...

Embodiment 2

[0039] The three-way orthogonal structure quartz fiber reinforced quartz composite material (83mm thick) that has undergone multiple silica sol impregnation-sintering in the early stage is used as the original substrate, with a density of 1.60g / cm 3 , Compressive strength 100MPa, shear strength 11.0MPa.

[0040] Adopt and embodiment 1 step processing, the density of three-way orthogonal structure quartz fiber reinforced quartz composite material after adopting the method of the present invention is 1.63g / cm 3 , an increase of 1.7%, a compressive strength of 160MPa, an increase of 60%, and a shear strength of 13.5MPa, an increase of 22%.

Embodiment 3

[0042] The 2.5D structure quartz fiber reinforced quartz composite material (70mm thick) that has undergone multiple silica sol impregnation-sintering in the early stage is used as the original substrate, with a density of 1.61g / cm 3 , Compressive strength 90MPa, shear strength 12MPa.

[0043] Adopt and embodiment 1 step processing, the density of 2.5D structure quartz fiber reinforced quartz composite material after adopting the method of the present invention is 1.64g / cm 3 , an increase of 2%, and a compressive strength of 140MPa, an increase of 55%. The shear strength is 15MPa, an increase of 25%.

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Abstract

The invention discloses a method for improving the density of a large-thickness fiber-reinforced quartz composite material. The fiber-reinforced quartz composite material which is prepared by multiple times of dipping-sintering technology in an early stage is taken as an original base material, fresh prepared orthosilicic acid solution is subjected to dipping drying for multiple times, and sintering is finally carried out. The method has the advantages of simple technology, low requirement on synthesis equipment and low cost, is favorable for improving the performance of the fiber-reinforced quartz composite material and is suitable for preparing the large-size fiber-reinforced quartz composite material.

Description

technical field [0001] The invention relates to a method for increasing the density of a large-thickness fiber-reinforced quartz composite material, which belongs to the technical field of fiber-reinforced composite materials. Background technique [0002] The fracture strain of traditional quartz ceramics is low, and when subjected to external forces, the material failure often manifests as brittle fracture, which is difficult to meet the requirements of structural parts under harsh conditions. In order to overcome its inherent limitations, in recent years, researchers at home and abroad have used the toughening effect of fibers to prepare a variety of fiber-reinforced quartz composite materials, which are widely used in high-temperature wave transmission and heat insulation. [0003] At present, the main preparation method of fiber-reinforced quartz composite materials is: using silica sol to impregnate the fiber preform several times, followed by drying and sintering. Fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/82C04B35/14C04B35/622C01B33/12
Inventor 吴焘张剑李洪深杨小波于长清昌毅赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH