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Continuous fiber reinforced sic part preparation method and product based on additive manufacturing

A continuous fiber and fiber-reinforced technology, which is applied in the field of continuous fiber-reinforced SiC parts preparation, can solve problems such as the difficulty in manufacturing continuous fiber composite parts, and achieve the effects of short preparation cycle, wide adaptability and easy operation

Active Publication Date: 2021-01-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods are difficult to manufacture continuous fiber composite parts with complex shapes, such as conformal cooling channels, grid structures, etc.

Method used

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  • Continuous fiber reinforced sic part preparation method and product based on additive manufacturing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (a) Construct the CAD model of the part, convert it into STL format, and use the fused deposition modeling additive manufacturing technology, use ABS as the polymer material, and untreated continuous carbon fiber as the reinforcing fiber material to form a three-dimensional polymer blank;

[0053] (b) thermally decomposing and carbonizing the three-dimensional polymer preform obtained in step (a) under vacuum conditions at 600° C. for 5 hours to obtain a carbon preform;

[0054] (c) Use the precursor impregnation cracking method, vacuumize the air in the preform, and then immerse the carbon preform in the toluene solution of polycarbosilane, pressurize to make the polycarbosilane fully fill the pores of the preform, and fill the preform after curing. The carbon preform with polycarbosilane is moved to the cracking furnace, and heat-treated at 900°C under vacuum conditions. The polycarbosilane is cracked at high temperature and reacts with the carbon preform to form SiC, ...

Embodiment 2

[0056] (a) Construct the CAD model of the part, convert it into STL format, and adopt the fused deposition modeling additive manufacturing technology, use PLA as the polymer material, and the continuous carbon fiber with CVD deposited SiC on the surface as the reinforcing fiber material to form a three-dimensional polymer preform;

[0057] (b) Pyrolysis and carbonization of the three-dimensional resin structure obtained in step (a) under vacuum conditions at 900°C for 8 hours to obtain a carbon preform;

[0058] (c) Use the precursor impregnation cracking method, vacuumize the air in the preform, and then immerse the carbon preform in the carbon tetrachloride solution of polycarbosilane, pressurize the polycarbosilane to fully fill the pores of the preform, and cure Finally, the carbon preform filled with polycarbosilane is moved to a cracking furnace, and heat-treated at 800°C under vacuum conditions. The polycarbosilane is cracked at high temperature and reacted with the carb...

Embodiment 3

[0060] (a) Construct the CAD model of the part, convert it into STL format, and adopt the fused deposition modeling additive manufacturing technology, use PC as the polymer material, and the continuous glass fiber with surface chemical modification as the reinforcing fiber material to form a three-dimensional polymer blank;

[0061] (b) Pyrolytically carbonizing the three-dimensional resin structure obtained in step (a) under an argon atmosphere at 800° C. for 10 h to obtain a carbon preform;

[0062] (c) Using the precursor impregnation and cracking method, vacuumize the air in the preform, and then immerse the carbon preform in the n-hexane solution of polycarbosilane, pressurize to make the polycarbosilane fully fill the pores of the preform, and cure it. The carbon preform filled with polycarbosilane is moved to a cracking furnace and heat-treated at 1100°C under vacuum conditions. The polycarbosilane is cracked at high temperature and reacts with the carbon preform to form...

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Abstract

The invention belongs to the field of SiC ceramic part preparation, and discloses a preparation method of continuous fiber reinforced SiC parts based on additive manufacturing, and a product. The preparation method comprises the following steps that (a) continuous fibers and raw materials for preparing SiC parts are selected, the continuous fibers and the raw materials are utilized for additive manufacturing, thus SiC part initial blanks with the continuous fibers are obtained, and an additive manufacturing method comprises fused deposition molding, laser selective sintering molding and a light curing technology or a three-dimensional spray printing technology; (b) the initial blanks are pyrolyzed and carbonized, thus porous structures are formed in the initial blanks, and in this way, porous carbon performs are obtained; and (c) the carbon performs are subjected to reaction sintering to generate SiC, and thus the required continuous fiber reinforced SiC parts are obtained. The invention further discloses the continuous fiber reinforced SiC parts obtained through the preparation method. Through the preparation method, the technical problems that ceramic parts are high in hardness and large in brittleness and have many limitations on structures of the formed parts are solved.

Description

technical field [0001] The invention belongs to the field of preparation of SiC ceramic parts, and more specifically relates to a preparation method and product of continuous fiber reinforced SiC parts based on additive manufacturing. Background technique [0002] Silicon carbide ceramics and their composite materials have the characteristics of high specific strength, specific modulus, high temperature resistance, corrosion resistance and low density, and have great potential in aerospace, military, energy, automotive industries and other fields. However, the inherent brittleness, poor reliability, and high processing cost of ceramic materials limit their further applications. Fiber-reinforced silicon carbide matrix composites can improve the mechanical strength and damage tolerance of the silicon carbide matrix by adding high-strength, high-modulus fiber materials, and continuous fibers have better reinforcement than chopped fibers, because continuous fibers are in A cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/573C04B35/80C04B35/82C04B35/64C04B35/653B28B1/00B33Y10/00B33Y70/10
CPCC04B35/573C04B35/82C04B35/64C04B35/653B28B1/001B33Y10/00B33Y70/00C04B2235/5248C04B2235/5244C04B2235/6026C04B2235/48C04B2235/665
Inventor 闫春泽李昭青刘主峰陈鹏史玉升
Owner HUAZHONG UNIV OF SCI & TECH