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Preparation method of high temperature resistant ceramic matrix composite screw

A technology of high-temperature-resistant ceramics and composite materials, which is applied in the field of preparation of high-temperature-resistant ceramic-based composite screws, can solve the problems that the temperature resistance can only reach 1650 ° C, and the thread accuracy is reduced, so as to improve the mechanical properties and oxidation resistance. The effect of complete screw teeth and high precision

Active Publication Date: 2017-08-08
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method prepares composite material bolts by CVI+PIP process, which reduces the processing cost, but its temperature resistance can only reach 1650 ° C, and the silicon carbide introduced by PIP is used after the screw thread is processed, and the silicon carbide particles are filled in after multiple dipping. The gap and the thread surface make the accuracy of the thread decrease

Method used

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  • Preparation method of high temperature resistant ceramic matrix composite screw
  • Preparation method of high temperature resistant ceramic matrix composite screw
  • Preparation method of high temperature resistant ceramic matrix composite screw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] M10 metric coarse thread round head standard bolts. The total length of the bolt is 24mm, the height of the countersunk head is 4mm, the length of the screw rod is 20mm, the total length of the thread is 18mm, and the angle of the countersunk head is 100°.

[0042] Use T7006K carbon fiber non-weft cloth and T70012K mesh tire to alternately lay up and needle-punch carbon fiber prefabricated body, in which the non-weft cloth 0 / 90° lay-up, and mesh tire 1.X+1.Y are continuously needle-punched into a carbon fiber prefabricated flat plate, The density is controlled at 0.45-0.5g / cm 3 .

[0043] Place the prefabricated flat plate in a CVI furnace, use propane and argon as raw materials, control the flow ratio of the two to 1:3, deposit at 950°C for 48 hours, and the density reaches 1.0g / cm 3 , Take out the screw that is processed as continuous. The shank diameter is 12mm, the screw head diameter is 25mm, and the height is 10mm.

[0044] Put the processed continuous screw i...

Embodiment 2

[0049] M12 metric coarse thread hexagonal standard bolts. The total length of the bolt is 25mm, the bolt head is 5mm, the length of the screw rod is 20mm, and the total length of the thread is 18mm.

[0050] In the X and Y directions, T7006KPANCF continuous long-fiber soft braid is used to lay up the long-fiber layer at 0 / 90°, and the Z-direction is made of T7006KPANCF bidirectional puncture to make a carbon fiber prefabricated body with thin edges, and the density is controlled at 0.6-0.75g / cm 3 .

[0051] Put the preform in a CVI furnace, use propane and argon as raw materials, control the flow ratio of the two to 1:2.5, deposit at 1000°C for 36 hours, and the density reaches 1.20g / cm 3 , Take out the screw that is processed as continuous. The shank diameter is 15mm and the height of the screw head is 12mm.

[0052] Put the processed continuous screw into the CVI furnace, H 2 The / Ar flow ratio is 1:2, the MTS flow rate is 200g / h, the deposition temperature is 1300°C, th...

Embodiment 3

[0056] M8 metric coarse thread hexagonal standard bolts. The total length of the bolt is 25mm, the bolt head is 5mm, the length of the screw rod is 20mm, and the total length of the thread is 18mm.

[0057] Silicon carbide fiber prefabricated body is formed by alternate lamination of silicon carbide fiber cloth, in which the cloth is laminated at 0 / 90°, continuously needled into a flat plate of fiber prefabricated body, and the density is controlled at 0.75g / cm 3 .

[0058] Put the preform in a CVI furnace, use propane and argon as raw materials, control the flow ratio of the two to 1:2.5, deposit at 1100°C for 24 hours, and the density reaches 1.30g / cm 3 , Take out the screw that is processed as continuous. The shank diameter is 10mm and the height of the screw head is 12mm.

[0059] Put the processed continuous screw into the CVI furnace, H 2 The / Ar flow ratio is 1:2, the MTS flow rate is 250g / h, the deposition temperature is 1500°C, the deposition time is 80 hours, and...

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Abstract

The invention relates to a preparation method of a screw, in particular to a preparation method of a high temperature resistant ceramic matrix composite screw. The preparation method of the high temperature resistant ceramic matrix composite screw comprises the following steps: (1) preparing a fiber perform; (2) depositing pyrolytic carbon in the fiber perform; (3) carrying out primary processing according to the size of the screw, after leaving a processing allowance, processing the fiber perform into a continuous screw rod; (4) depositing an SiC matrix in the screw rod; (5) carrying out secondary processing according to the size of the screw, and finishing in place; (6) by taking an ultra-high temperature ceramic precursor as a raw material, introducing an ultra-high temperature ceramic matrix; (7) processing the continuous screw rod into single screws, and preparing SiC coatings on the surfaces respectively; and (8) carrying out thread processing according to the requirements of the screw to obtain a screw product. According to the preparation method, by organically combining preparation and processing of a screw material, the prepared screw resists high temperature, is intact in screw tooth size and high in accuracy and has higher mechanical performance and oxidation resistance performance.

Description

technical field [0001] The invention relates to a method for preparing a screw, in particular to a method for preparing a high-temperature resistant ceramic matrix composite material screw. Background technique [0002] As countries around the world pay more and more attention to the development of hypersonic vehicles, the flight speed of the aircraft is also gradually increasing. During its high-speed flight, friction with the atmosphere generates a lot of heat, making its nose cone, leading edge and other parts as high as 1800°C. Therefore, its thermal protection system is crucial. The screws and nuts used to connect the structural parts of the thermal protection system need to have excellent performance, especially when the screws are applied outside the heat-resistant structure, and are subjected to high temperature, high pressure, vibration and other factors, they need to have sufficient strength and durability. High temperature, anti-oxidation and other properties. ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/84C04B35/56C04B35/628C04B35/565C04B41/87
CPCC04B35/5622C04B35/565C04B35/62863C04B35/62873C04B35/806C04B41/009C04B41/5059C04B41/87C04B2235/483C04B2235/77C04B2235/94C04B2235/95C04B41/4531
Inventor 王艳艳周长灵栾强刘瑞祥姜凯杨芳红
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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