Fiber preform forming method of ceramic matrix composite longitudinal corrugated heat insulation screen

A corrugated heat shield and composite material technology, applied in combustion methods, chemical instruments and methods, lighting and heating equipment, etc., can solve the problems of difficulty in forming fiber preforms, low mold attachment rate, etc. The effect of reducing production cost and reducing fiber damage

Active Publication Date: 2022-02-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a fiber prefabricated method for the longitudinally corrugated heat shield of ceramic matri

Method used

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  • Fiber preform forming method of ceramic matrix composite longitudinal corrugated heat insulation screen

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1:

[0037] A fiber preform forming method of a longitudinal corrugating screen of a ceramic matrix composite material, including the following steps:

[0038] (1) High-purity graphite, in the inside of the heat shield, the outer mold 1 and other molds of the molding die are prepared, respectively; wherein the inner mold 1 and the outer die have a number of diameters perpendicular to its profile. 5mm vent hole, the axial height of the stereotype is 1.12 times the height of the heat insulating screen member, and the fixed mold wall thickness is 10 mm, and the inner mold 1 and the outer mold of the stereotype are 6 sectors distributed along the heat shield. Segment part combination;

[0039] (2) Wrap the two-dimensionally woven carbon fiber in the internal mold 1, and the bonding of the two-dimensional woven carbon fiber flat cloth and the internal mold 1 is completed with polyvinyl alcohol.

[0040] (3) Apply polyvinyl alcohol green rubber to the outer surface of the...

Example Embodiment

[0044] Example 2:

[0045] A fiber preform forming method of a longitudinal corrugating screen of a ceramic matrix composite material, including the following steps:

[0046] (1) Electrode graphite is used in the inside of the insulation screen, and the inner mold 1 and an exterior mold of the stereotype die are each prepared, and the mold 1 and the outer mold have a number of diameters perpendicular to the vertical shape. The venting hole, the axial height of the stereotype is 1.1 times the height of the heat insulating screen member, the stereotype wall thickness is 5 mm, and the internal mold 1 and the outer mold of the stereotype are all 6 fan sections distributed along the heat-insulating screen. Combination of parts;

[0047] (2) Wrap the two-dimensionally woven carbon fiber in the internal mold 1, and the bonding of the two-dimensional woven carbon fiber flat cloth and the internal mold 1 is completed with polyvinyl alcohol.

[0048] (3) Apply polyvinyl alcohol green rubber...

Example Embodiment

[0052] Example 3:

[0053] A fiber preform forming method of a longitudinal corrugating screen of a ceramic matrix composite material, including the following steps:

[0054] (1) High-purity graphite, in the inside of the heat shield, the outer mold 1 and other molds of the molding die are prepared, respectively; wherein the inner mold 1 and the outer die have a number of diameters perpendicular to its profile. 10mm vent hole, the axial height of the stereotype is 1.5 times the height of the heat insulating screen member, the stereotyped mold wall thickness is 15 mm, and the inner mold 1 and the outer mold of the stereotype are all 6 sectors distributed along the heat shield. Segment part combination;

[0055] (2) Wrap the two-dimensionally woven carbon fiber in the internal mold 1, and the bonding of the two-dimensional woven carbon fiber flat cloth and the internal mold 1 is completed with polyvinyl alcohol.

[0056] (3) Apply polyvinyl alcohol green rubber to the outer surface ...

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Abstract

The invention discloses a method for forming a fiber preform of a ceramic matrix composite longitudinal corrugated heat shield, which comprises the following steps of: preparing an inner mold and an outer mold of a heat shield mold, winding single-layer unidirectional fiber cloth on the inner mold for one circle and fixing, replacing fiber bundles and hot melt adhesive lines in situ, and repeating the operations to obtain the fiber preform; and finally, clamping the fiber preform between the inner mold and the outer mold, and sewing the inner mold, the fiber preform and the outer mold into a whole by using a sewing line, thereby completing the forming of the fiber preform. According to the invention, the fiber damage in the fiber preform forming process can be greatly reduced. According to the method, the mold attaching rate of the prefabricated body can be remarkably improved, meanwhile, the production cost can be remarkably reduced, and the preparation period is shortened. In addition, the prepared fiber preform can be subjected to a subsequent densification process of a ceramic matrix by adopting a chemical vapor infiltration method, a resin infiltration cracking method or a melt infiltration method, so that the process adaptability is better.

Description

technical field [0001] The invention relates to the technical field of thermal protection of ceramic matrix composite materials, in particular to a method for forming a fiber prefabricated body of a ceramic matrix composite material longitudinally corrugated heat shield. Background technique [0002] Installing the afterburner between the turbine and the tail nozzle of the aero-engine is one of the main technical means for the advanced military aircraft to increase the flight speed and improve the maneuverability in a short time. In the working state of afterburner, the core gas temperature of the afterburner can generally reach above 2000K, which far exceeds the temperature limit that the engine case can withstand. It is necessary to design a heat shield structure between the afterburner and the case , to isolate the core gas from the casing, and at the same time introduce part of the external duct airflow to assist in cooling the heat shield structure to ensure that the en...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B5/06B32B7/12B32B7/08B32B37/00B32B37/12F01D25/14F23R3/42
CPCB32B9/007B32B5/024B32B5/26B32B7/12B32B5/06B32B7/08B32B37/00B32B37/12F01D25/145F23R3/42B32B2262/106B32B2262/10B32B2307/304B32B2605/18
Inventor 刘持栋张海昇栗尼娜杨勇涂建勇何江怡成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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