A three-dimensional porous heat-proof structure conformal preparation mold and preparation method

Abstract

The invention provides a three-dimensional porous heat-proof structure conformal preparation mold and a preparation method, which belong to the technical field of heat-proof material forming. In the present invention, the three-dimensional porous structure prefabricated body is placed on the inner formwork, the diversion layer is laid outside the prefabricated body, and the flexible outer film layer is arranged outside the diversion layer, and the diversion layer and the flexible outer film layer are arranged at the bottom along the The bottom plate is extended to a certain width, which can not only ensure the integrity of the diversion layer and the flexible outer film layer and the surface of the prefabricated body, but also eliminate the dead corner of the glue due to the fan-shaped transmission, and improve the uniformity of the glue impregnation; through vacuuming, The glue is fed from the bottom, and due to the diversion effect of the diversion layer, the glue liquid penetrates evenly from the outside to the inside along the surface of the prefabricated body, and the excess glue liquid is discharged from the top, which solves the problem of uneven impregnation due to the gravity gradient, and at the same time improves the The utilization efficiency of the glue can realize the overall forming of various size spans and various curved surface configurations, breaking through the size limit of the existing forming process.

Description

technical field

[0001] The invention relates to the technical field of forming heat-resistant materials, and in particular provides a three-dimensional porous heat-resistant structure conformal preparation mold and a preparation method. Background technique

[0002] With the increasing emphasis on aerospace deep space exploration missions at home and abroad, lunar exploration has been included in the development direction of advanced aerospace technology. Friction will form an extremely high temperature exceeding 3000°C on the surface of the return capsule. The heat-resistant structure is the only effective measure to protect the return capsule from burning. The structure is required to be formed as a whole, and there can be no splicing and heterogeneous interface problems.

[0003] The heat-proof structure of the new generation spacecraft return module is a three-dimensional porous structure, using three-dimensional fiber-reinforced low-density ablation-resistant porous ma...

Examples

preparation example Construction

[0066] The present invention also provides a conformal preparation method of a three-dimensional porous heat-proof structure, comprising the following steps:

[0067] Step 1, preparing a prefabricated body with a three-dimensional porous structure;

[0068] Specifically, it is preferable to use a three-dimensional needle-punching process or a three-dimensional weaving process to prepare a preform with fiber distribution in the plane and in the thickness direction.

[0069] Step 2, placing the prefabricated body on the inner template of the mold provided in the above embodiment;

[0070] Step 3, laying the diversion layer outside the prefabricated body;

[0071] Step 4, laying the flexible outer film layer on the diversion layer, installing the inlet / outlet nozzle, and then sealingly connecting the flexible outer film layer with the bottom plate to form a closed system;

[0072] Step 5, first vacuumize through the glue outlet, and then enter the shaped resin glue through the ...

Embodiment

[0087] as attached Figure 4 As shown, the three-dimensional acupuncture process is used to prepare a plate-shaped three-dimensional prefabricated body 1 with an inner diameter of R2200mm, a thickness of 50mm, a width of 1000mm, and a chord length of 1500mm. The inner template 2 is cast aluminum alloy, the outer diameter is R2200mm, the width is 1000mm, and the height is 500mm. The distance between the lowest point of the arc-shaped three-dimensional prefabricated body 1 and the bottom plate 8 is 150mm;

[0088] Lay diversion layer 3 on the surface of arc-shaped three-dimensional prefabricated body 1, as attached Figure 5 As shown, the diversion layer 3 is composed of six sets of coils, three sets of coils on the left and right sides of the arc of the three-dimensional prefabricated body, and each set of coils starts from the central vertex of the arc and is placed in circles along the arc surface. Each connected two coils are fixed with rubber bands or tapes. The coils are ...

technical field

[0001] The invention relates to the technical field of forming heat-resistant materials, and in particular provides a three-dimensional porous heat-resistant structure conformal preparation mold and a preparation method. Background technique

[0002] With the increasing emphasis on aerospace deep space exploration missions at home and abroad, lunar exploration has been included in the development direction of advanced aerospace technology. Friction will form an extremely high temperature exceeding 3000°C on the surface of the return capsule. The heat-resistant structure is the only effective measure to protect the return capsule from burning. The structure is required to be formed as a whole, and there can be no splicing and heterogeneous interface problems.

[0003] The heat-proof structure of the new generation spacecraft return module is a three-dimensional porous structure, using three-dimensional fiber-reinforced low-density ablation-resistant porous ma...

Examples

preparation example Construction

[0066] The present invention also provides a conformal preparation method of a three-dimensional porous heat-proof structure, comprising the following steps:

[0067] Step 1, preparing a prefabricated body with a three-dimensional porous structure;

[0068] Specifically, it is preferable to use a three-dimensional needle-punching process or a three-dimensional weaving process to prepare a preform with fiber distribution in the plane and in the thickness direction.

[0069] Step 2, placing the prefabricated body on the inner template of the mold provided in the above embodiment;

[0070] Step 3, laying the diversion layer outside the prefabricated body;

[0071] Step 4, laying the flexible outer film layer on the diversion layer, installing the inlet / outlet nozzle, and then sealingly connecting the flexible outer film layer with the bottom plate to form a closed system;

[0072] Step 5, first vacuumize through the glue outlet, and then enter the shaped resin glue through the ...

Embodiment

[0087] as attached Figure 4 As shown, the three-dimensional acupuncture process is used to prepare a plate-shaped three-dimensional prefabricated body 1 with an inner diameter of R2200mm, a thickness of 50mm, a width of 1000mm, and a chord length of 1500mm. The inner template 2 is cast aluminum alloy, the outer diameter is R2200mm, the width is 1000mm, and the height is 500mm. The distance between the lowest point of the arc-shaped three-dimensional prefabricated body 1 and the bottom plate 8 is 150mm;

[0088] Lay diversion layer 3 on the surface of arc-shaped three-dimensional prefabricated body 1, as attached Figure 5 As shown, the diversion layer 3 is composed of six sets of coils, three sets of coils on the left and right sides of the arc of the three-dimensional prefabricated body, and each set of coils starts from the central vertex of the arc and is placed in circles along the arc surface. Each connected two coils are fixed with rubber bands or tapes. The coils are ...

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