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Method for forming continuous fiber-bonded short carbon fiber toughened ceramic matrix composite material

A short carbon fiber, continuous fiber technology, applied in the direction of additive processing, can solve the problems that the fiber and the ceramic matrix cannot be formed at the same time, the accuracy of the ceramic matrix composite material is limited, and the toughening effect is not good. The effect of molding and wide choice

Inactive Publication Date: 2019-09-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with this method, the fiber and the ceramic matrix cannot be formed simultaneously, and the precision of the final ceramic matrix composite is limited by the pre-woven fiber preform
On the other hand, although short carbon fibers can be formed simultaneously with the ceramic matrix, the toughening effect is not good.

Method used

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  • Method for forming continuous fiber-bonded short carbon fiber toughened ceramic matrix composite material
  • Method for forming continuous fiber-bonded short carbon fiber toughened ceramic matrix composite material
  • Method for forming continuous fiber-bonded short carbon fiber toughened ceramic matrix composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1, dissolving polycarbosilane as a ceramic precursor in the organic solvent n-hexane to obtain a ceramic precursor solution with a mass fraction of the ceramic precursor of 50%, taking a ceramic precursor and chopped carbon fibers with a mass ratio of 4:5, Add chopped carbon fibers into the ceramic precursor solution, stir and evaporate the ceramic precursor solution, and obtain -1 Under the shear rate, the short carbon fiber mixed precursor slurry with a viscosity of 1000Pa s;

[0032] Step 2, centrifuge the short carbon fiber mixed precursor slurry at a speed of 1000r / min for 40 minutes to obtain the direct writing slurry, and then load it into the air pressure feeding device of the 3D printer;

[0033] Step 3: Install the glass fiber as a continuous fiber on the fiber conveying device, then place the beginning of the continuous fiber into the inner cylinder of the coaxial nozzle, and make it pass over the outlet of the coaxial nozzle, and the outer cylinder of t...

Embodiment 2

[0040] Step 1, dissolving polysiloxane as a ceramic precursor in an organic solvent mixed with cyclohexane, n-heptane, n-octane and petroleum ether to obtain a ceramic precursor solution with a mass fraction of ceramic precursor of 50%, taking A mass ratio of ceramic precursor and chopped carbon fiber is 10:5, the chopped carbon fiber is added to the ceramic precursor solution, the ceramic precursor solution is stirred and evaporated, and the obtained -1 Under the shear rate, the short carbon fiber mixed precursor slurry with a viscosity of 5000Pa s;

[0041] Step 2, centrifuging the short carbon fiber mixed precursor slurry at a speed of 3000r / min for 20 minutes to obtain the direct writing slurry, and then loading it into the pneumatic feeding device of the 3D printer;

[0042] Step 3, install carbon fiber and aramid fiber as continuous fiber on the fiber conveying device, then put the beginning of the continuous fiber into the inner cylinder of the coaxial nozzle, and make ...

Embodiment 3

[0049] Step 1, dissolving polysilazane as a ceramic precursor in toluene and xylene as an organic solvent to obtain a ceramic precursor solution with a mass fraction of a ceramic precursor of 50%, and taking a ceramic precursor with a mass ratio of 7:5 and chopped carbon fiber, the chopped carbon fiber is added to the ceramic precursor solution, the ceramic precursor solution is stirred and evaporated, and the obtained -1Under the shear rate, the short carbon fiber mixed precursor slurry with a viscosity of 3000Pa s;

[0050] Step 2: centrifuge the short carbon fiber mixed precursor slurry at a speed of 2000r / min for 30 minutes to obtain the direct writing slurry, and then load it into the pneumatic feeding device of the 3D printer;

[0051] Step 3, install polyaramid fiber and smart fiber as continuous fiber on the fiber conveying device, then put the beginning of the continuous fiber into the inner cylinder of the coaxial nozzle, and make it pass over the outlet of the coaxi...

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Abstract

The invention discloses a method for forming a continuous fiber-bonded short carbon fiber toughened ceramic matrix composite material. A ceramic precursor, an organic solvent and chopped carbon fibersare mixed to form a direct writing slurry, the direct writing slurry is added into the outer cylinder of a coaxial nozzle, a continuous fiber is added into the inner cylinder of the coaxial nozzle tomake a finally printed blank have a core-shell structure with the continuous fiber as the core and a short carbon fiber toughened ceramic matrix as the shell, the ceramic matrix is formed by crackingand converting the ceramic precursor, the chopped carbon fibers are directionally distributed in the matrix, and the chopped carbon fibers in the outer layer are directionally arranged, so the toughness of the ceramic material can be greatly improved. A 3D printing technology makes the ceramic precursor quickly and accurately molded, and the ceramic material matrix with different components can be prepared in different sintering environments in the high temperature sintering process by means of a precursor conversion process, so the original materials can be widely selected.

Description

technical field [0001] The invention belongs to the field of fiber-reinforced ceramic matrix composite material printing, and in particular relates to a forming method of continuous fiber combined with short carbon fiber toughened ceramic matrix composite material. Background technique [0002] Fiber-toughened ceramic matrix composites are a new type of thermal structure / function integrated material that combines the performance advantages of metal materials and ceramic materials. It overcomes the shortcomings of ceramic materials such as high density, high brittleness, and poor reliability. At this stage, there are many studies on continuous fiber toughened ceramic matrix composites, but less research on short carbon fiber toughened ceramics. Continuous fibers have a significant effect on improving the toughness of ceramic matrix composites, but current research mainly focuses on the preparation of continuous fiber preforms and then the synthesis of ceramic matrix composite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/571C04B35/622C04B35/626B33Y10/00B33Y70/00
CPCB33Y10/00B33Y70/00C04B35/806C04B35/571C04B35/622C04B35/62605C04B2235/6026C04B2235/96
Inventor 鲁中良随雨浓夏园林赵洪炯苗恺李涤尘
Owner XI AN JIAOTONG UNIV
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