CN115433923B - Concave-like ceramic matrix composite connecting part forming die and application method thereof - Google Patents

Concave-like ceramic matrix composite connecting part forming die and application method thereof Download PDF

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Publication number
CN115433923B
CN115433923B CN202210879895.5A CN202210879895A CN115433923B CN 115433923 B CN115433923 B CN 115433923B CN 202210879895 A CN202210879895 A CN 202210879895A CN 115433923 B CN115433923 B CN 115433923B
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framework
box
die
shaped
fiber cloth
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CN115433923A (en
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李仁意
田录录
陈旭
张少博
陈静
康志杰
付志强
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Xian Xinyao Ceramic Composite Material Co Ltd
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Xian Xinyao Ceramic Composite Material Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • C04B41/87—Ceramics
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/02—Pretreatment of the material to be coated
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/26—Deposition of carbon only
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
    • C23C16/32—Carbides
    • C23C16/325—Silicon carbide

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Moulds, Cores, Or Mandrels (AREA)

Abstract

The invention relates to a molding die and a process method for a concave-like ceramic matrix composite connecting part. The ceramic matrix composite connecting part forming die and the process method solve the technical problems that an existing C/SiC composite connecting part is formed by independently forming a plurality of small components and then assembling and rivet welding, the riveting cannot be realized due to the fact that the assembling is limited by the height of a part, and the cutting part has a penetration risk when a single small component is shaped. The connecting parts are split into a plurality of small components, the small components are subjected to pre-carbon deposition, then are assembled and sewn, carbon deposition is continuously carried out on the sewn preform, and when the framework preform is shaped, a crisscross method is adopted to layer the carbon fiber cloth. The invention can effectively solve the problem that the middle part of the prefabricated body cannot be deposited to the carbon interface layer due to thicker wall thickness, thereby improving the integral strength of the connecting part and simultaneously solving the problem of penetration caused by locally and continuously cutting the carbon cloth.

Description

Concave-like ceramic matrix composite connecting part forming die and application method thereof
Technical Field
The invention relates to a molding die for a concave-like ceramic matrix composite connecting part and a using method thereof.
Background
The C/SiC composite material connecting part is formed by assembling and rivet welding after a plurality of small components are formed independently. The conventional rivet welding process is only suitable for small components with certain heights on the side surfaces because a riveting tool is required, and the rivet welding cannot be performed when the heights of the side surfaces of the small components cannot meet the heights required by the rivet welding process. In addition, when a single small-sized component is shaped, in order to ensure smoothness of the carbon fiber cloth, the carbon fiber cloth is usually required to be cut, and the cutting position is at a penetrating risk, so that the strength of the small-sized component can be influenced.
Disclosure of Invention
The invention mainly aims to solve the technical problems that the side surface of a plurality of small components are limited by the height of the small components when the traditional C/SiC composite material connecting component is riveted and welded after the small components are independently molded, so that the rivet and welding cannot be realized, and the cutting part of a single small component has a penetration risk when the small component is molded, and the invention provides a molding die for the concave-type ceramic matrix composite material connecting component, which is characterized in that:
comprises a skeleton carbon deposition tool and a box-type part carbon deposition tool;
the box-type part carbon deposition tool comprises at least one box-type part inner die and a plurality of box-type part outer dies;
the shape of the outer die of the box-shaped part is matched with the shape of the inner die of the box-shaped part;
the processing cavity between the box-shaped part inner die and the box-shaped part outer die is used for processing a box-shaped part prefabricated body in the connecting part;
the box-shaped part inner die and the box-shaped part outer die are fixed through a reinforcing frame;
a plurality of L-shaped sewing grooves are uniformly formed in the periphery of the bottom of the box-shaped part inner die;
the framework carbon sinking tooling comprises a first framework outer die, a second framework outer die, a first framework inner die, a second framework inner die, a third framework inner die, a fourth framework inner die and a fifth framework inner die; the first framework outer mold is similar to a concave shape, the outer mold surface is a convex side surface, the inner mold surface is a concave side surface, and the shape of the inner mold surface is matched with the shape of a framework prefabricated body in the connecting part; the inner molded surface is provided with a concave groove penetrating through the outer mold of the first framework, and the shape of the concave groove is matched with that of the outer mold of the second framework;
the second framework outer die is fixed in the concave groove of the first framework outer die, the bottom surface of the second framework outer die extends out of the inner molded surface, and the peripheral edges of the opening are flush with the peripheral edges of the concave groove;
the first framework inner die, the second framework inner die and the third framework inner die are linearly distributed in an I shape and are sequentially fixed on the inner molded surface of the first framework outer die; the first framework inner die and the third framework inner die are respectively positioned at the upper side and the lower side of the second framework inner die, and the fourth framework inner die and the fifth framework inner die are fixed on the inner molded surface of the first framework outer die and are respectively positioned at the left side and the right side of the second framework inner die; the shape of the second framework inner die is matched with the shape of the bottom of the second framework outer die.
The shapes of the second framework outer die, the fourth framework inner die and the fifth framework inner die are matched with the shapes of the box-shaped part prefabricated body.
Further, the box-shaped part carbon deposition tooling number is 3, when the box-shaped part carbon deposition tooling number is one, the box-shaped part carbon deposition tooling needs to be repeatedly processed for 3 times, the processing time is long, the processing efficiency is low, and when the box-shaped part carbon deposition tooling number is 3, the box-shaped part prefabricated body can be deposited at one time, so that the processing efficiency is improved.
Further, the width of the L-shaped sewing groove is 2-3mm, and the interval is 8-10mm.
Furthermore, the skeleton carbon deposition tool and the box-type part carbon deposition tool are respectively provided with a plurality of positioning pin holes and bolt holes for fixing.
Meanwhile, the invention also provides a use method of the concave-type ceramic matrix composite connecting part forming die, which is characterized by comprising the following steps of:
step 1, shaping of a box-shaped part preform
Step 1.1, taking 3 box-type member inner molds with the same shape and structure, respectively paving a plurality of layers of carbon fiber cloth on the outer walls of the first box-type member inner mold, the second box-type member inner mold and the third box-type member inner mold, wherein the carbon fiber cloth is fixed by an adhesive, the edges of the carbon fiber cloth are flush with the edges around the opening of the box-type member inner mold, so as to obtain a first box-type member prefabricated body, a second box-type member prefabricated body and a third box-type member prefabricated body, sewing the 3 box-type member prefabricated bodies on the outer walls of the corresponding box-type member inner molds, and locking the edges around the opening of the 3 box-type member prefabricated bodies;
step 1.2, installing a first box-type part outer mold and a second box-type part outer mold on the outer surface of each box-type part prefabricated body with a box-type part inner mold, and fixing through 2 reinforcing frames to finish shaping of 3 box-type part prefabricated bodies;
step 2, shaping the skeleton preform
Step 2.1, positioning the second framework outer die by using a positioning pin, fixing a bolt in a concave groove of the first framework outer die, enabling the opening direction to be consistent with the outer surface direction, enabling the bottom surface to extend out of the inner molded surface, and enabling the peripheral edge of the opening to be flush with the peripheral edge of the concave groove;
step 2.2, paving a layer of first-layer carbon fiber cloth in a straight shape on the inner molded surface of the first framework outer mold, wherein the width of the first-layer carbon fiber cloth is the same as the width of the bottom of the second framework outer mold; a second layer of carbon fiber cloth in an I shape is paved on the first layer of carbon fiber cloth, a third layer of carbon fiber cloth in an I shape is paved on the second layer of carbon fiber cloth, wherein the width of the third layer of carbon fiber cloth is the same as the width of the bottom of the second framework outer die, an included angle between the third layer of carbon fiber cloth and the first layer of carbon fiber cloth is 90 degrees, a fourth layer of carbon fiber cloth in an I shape is paved on the third layer of carbon fiber cloth, an included angle between the fourth layer of carbon fiber cloth and the second layer of carbon fiber cloth is 90 degrees, no visible gap is reserved at the joint of each layer of carbon fiber cloth, the carbon fiber cloth is fixed by an adhesive, the layering is repeated for a plurality of times, a framework preform is obtained, the edge of the framework preform is enabled to be flush with the edge of the inner surface of the first framework outer die, and the framework preform is sewn on the inner surface of the first framework outer die;
step 2.3, arranging the first framework inner die, the second framework inner die and the third framework inner die in an I-shaped linear manner, positioning by positioning pins in sequence, and fixing bolts on the framework preform to ensure that the edges of all end faces are flush with the edges of the framework preform; then the openings of the fourth framework inner die and the fifth framework inner die face upwards, the bottom surfaces are positioned by positioning pins, and bolts are fixed on the left side and the right side of the second framework inner die, so that the shaping of the framework preform is completed;
step 3, CVI pre-carbon deposition
Respectively pre-depositing a carbon interface layer on the box-shaped part prefabricated body and the framework prefabricated body which are subjected to shaping according to preset requirements, wherein the thickness of the carbon interface layer is 30-50nm;
step 4, pre-carbon precipitation post-treatment
Step 4.1, after pre-carbon deposition, removing the reinforcing frame, removing the outer mold of the box-type part, sewing and trimming the thread ends;
step 4.2, dismantling a fourth framework inner die, a fifth framework inner die, a second framework outer die, a first framework inner die, a second framework inner die and a third framework inner die, enabling the openings of 3 box-shaped member prefabricated bodies with box-shaped member inner dies to face upwards, and fixing the bottom surfaces of the box-shaped member prefabricated bodies to corresponding positions of the fourth framework inner die, the fifth framework inner die and the second framework outer die through positioning pins and bolts respectively;
step 4.3, sewing adjacent surfaces of the skeleton prefabricated body and the 3 box-type piece prefabricated bodies with the box-type piece inner molds, and then carrying out through sewing on L-shaped sewing grooves corresponding to the adjacent surfaces among the 3 box-type piece prefabricated bodies with the box-type piece inner molds to obtain a sewn concave-like connecting part prefabricated body, wherein the through sewing is to sew two opposite sewing grooves;
step 5, CVI carbon deposition is carried out again
Step 5.1, fixing the first framework inner die, the second framework inner die and the third framework inner die on the framework preform again;
step 5.2, adopting a CVI process to deposit a carbon interface layer according to design requirements;
step 6, adopting a CVI process to deposit a silicon carbide substrate on the concave-like connecting part preform subjected to carbon interface layer deposition according to preset requirements until the preset required specified density is reached, and removing a die on the connecting part;
step 7, machining the dimension specification
And processing the concave-like ceramic matrix composite connecting part prefabricated body reaching the specified density, processing a positioning pin and a hole penetrating through the connecting part prefabricated body when the bolt is fixed into a weight reduction cavity according to design requirements, and processing the whole outline dimension according to preset requirements to obtain the concave-like ceramic matrix composite connecting part comprising the first box-type part, the second box-type part, the third box-type part and the framework.
Further, the step 6 specifically includes:
6.1 The density of the prefabricated body of the similar concave connecting part reaches a first preset density, and the first framework inner die, the second framework inner die and the third framework inner die are removed;
6.2 The density of the prefabricated body of the similar concave connecting part reaches a second preset density, and the first framework outer die and the 3 box-shaped part inner dies are removed;
6.3 Continuing to deposit until the density of the prefabricated body of the similar concave connecting part reaches the final preset density, and finishing the deposition.
The mould is dismantled in batches through the first preset density and the second preset density, so that the deposition effect of the connecting part preform can be effectively improved, and the strength of the preform is enhanced.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention is mainly used for shaping the C/SiC composite material connecting part which has smaller side surface height of the small-sized component and can not be prepared by adopting a rivet welding mode. By performing the preliminary carbon deposition on each of the small-sized member preforms separately and then sewing the side surfaces of the preliminary carbon deposition small-sized members and performing the secondary carbon deposition, not only is the bonding between the carbon interface layers enhanced, but also the overall strength of the connecting member is improved.
2. When the framework preform is shaped, the carbon fiber cloth is cut and laid in a crisscross mode, so that the risk of penetration caused by continuous cutting and laying of the part is effectively avoided, and the overall strength of the connecting part can be improved.
3. In the invention, the die assembly fixing adopts a mode of bolt fixing, combining positioning and slightly positioning, and is flexible and convenient.
4. In the invention, the connecting part prefabricated body is split into a plurality of small-sized component prefabricated bodies, the small-sized component prefabricated bodies are pre-carbon-deposited and then sewn, and then the sewn prefabricated bodies are continuously carbon-deposited, thereby effectively solving the problem of uneven carbon interface layer deposition caused by thicker wall thickness of the prefabricated bodies and improving the integral strength of the connecting part.
Drawings
FIG. 1 is a schematic view of a box-shaped preform after shaping according to the present invention;
FIG. 2 is a schematic structural view of the second skeleton outer mold fixed in the concave groove of the first skeleton outer mold in the invention;
FIG. 3 is a schematic view of a first layer of carbon fiber cloth laid on the inner mold surface of the first framework outer mold in the invention;
FIG. 4 is a schematic view of the laying of a second layer of carbon fiber cloth on the inner surface of the outer mold of the first framework in the invention;
FIG. 5 is a schematic diagram of the structure of the present invention after the shaping of the skeleton preform;
FIG. 6 is a schematic view showing a structure in which a first box preform and a second box preform with box inner molds are fixed on a skeleton preform after removing a first skeleton inner mold, a second skeleton inner mold, a third skeleton inner mold, a fourth skeleton inner mold, and a fifth skeleton inner mold after pre-carbon deposition;
FIG. 7 is a schematic view of the structure of the present invention wherein the second skeletal outer mold is removed after pre-carbon deposition, and a third box-like member preform with an inner mold is fixed to the skeletal preform;
FIG. 8 is a schematic view of a pair of stitching in accordance with the present invention;
FIG. 9 is a schematic view of the structure of the present invention before the first, second and third matrix molds are again fixed to the matrix preform for the second carbon deposition;
FIG. 10 is a schematic view showing a split structure of a preform for a joining member of a concave-type ceramic matrix composite according to the present invention;
FIG. 11 is a schematic view of a concave side structure of a preform for a ceramic matrix composite connection member of the present invention after finishing the machining;
FIG. 12 is a schematic view of a male side structure of a preform for a ceramic matrix composite connection member of the present invention after finishing the process;
FIG. 13 is a schematic view showing a split structure of a concave-type ceramic matrix composite connecting member preform after finishing processing in accordance with the present invention;
the drawings are detailed as follows:
1-first box-type member, 2-second box-type member, 3-third box-type member, 4-skeleton, 5-first box-type member preform, 6-second box-type member preform, 7-third box-type member preform, 8-skeleton preform, 701-third box-type member inner mold, 702-first box-type member outer mold, 703-second box-type member outer mold, 704-reinforcing frame, 9-second skeleton outer mold, 10-first skeleton outer mold, 1101-first layer carbon fiber cloth, 1102-second layer carbon fiber cloth, 12-fourth skeleton inner mold, 13-fifth skeleton inner mold, 14-first skeleton inner mold, 15-second skeleton inner mold, 16-third skeleton inner mold, 501-first box-type member inner mold, 601-second box-type member inner mold, 17-pair-through sewing, 18-dowel holes, 19-bolt holes, 20-L-type sewing grooves, 21-weight reducing cavities.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, based on the embodiments of the present invention shall fall within the scope of protection of the present invention.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
The invention provides a molding die for a connecting part of a similar concave ceramic matrix composite, which comprises a skeleton carbon sinking tool and a box-type part carbon sinking tool; the box-type part carbon deposition tool comprises at least one box-type part inner die and a plurality of box-type part outer dies; the shape of the outer die of the box-shaped part is matched with the shape of the inner die of the box-shaped part; the processing cavity between the box-shaped part inner die and the box-shaped part outer die is used for processing a box-shaped part prefabricated body in the connecting part; the inner die and the outer die are fixed through a reinforcing frame 704; a plurality of L-shaped sewing grooves 20 are uniformly formed in the periphery of the bottom of the box-shaped part inner die; the framework carbon sinking tooling comprises a first framework outer die 10, a second framework outer die 9, a first framework inner die 14, a second framework inner die 15, a third framework inner die 16, a fourth framework inner die 12 and a fifth framework inner die 13; wherein the first framework outer die 10 is shaped like a concave, the outer profile is a convex side, the inner profile is a concave side, and the shape of the inner profile is matched with the shape of a framework preform in the connecting part; the inner molded surface is provided with a concave groove penetrating through the outer mold 10 of the first framework, and the shape of the concave groove is matched with that of the outer mold 9 of the second framework; the second framework outer die 9 can be fixed in a concave groove of the first framework outer die 10, the bottom surface of the second framework outer die extends out of the inner molded surface, and the peripheral edge of the opening is flush with the peripheral edge of the concave groove; the first framework inner die 14, the second framework inner die 15 and the third framework inner die 16 can be in I-shaped linear arrangement and are sequentially fixed on the inner molded surface of the first framework outer die 10; the first framework inner die 14 and the third framework inner die 16 are respectively positioned at the upper side and the lower side of the second framework inner die 15, and the fourth framework inner die 12 and the fifth framework inner die 13 can be fixed on the inner molded surface of the first framework outer die 10 and are respectively positioned at the left side and the right side of the second framework inner die 15; the shapes of the second framework outer die 9, the fourth framework inner die 12 and the fifth framework inner die 13 are matched with the shape of the box-shaped part prefabricated body; the skeleton carbon deposition tool and the box-type part carbon deposition tool are respectively provided with a plurality of positioning pin holes 18 and bolt holes 19 for fixing.
Example 1
The application method of the concave-like ceramic matrix composite connecting part forming die comprises the following steps:
1) Shaping of box-shaped part preforms
1.1 Taking 3 box-type member inner molds with the same shape and structure, respectively paving a plurality of layers of carbon fiber cloth on the outer walls of the first box-type member inner mold 501, the second box-type member inner mold 601 and the third box-type member inner mold 701 until the thickness of the carbon fiber cloth reaches 3mm, fixing the carbon fiber cloth by using an adhesive, ensuring that the edges of the carbon fiber cloth are flush with the peripheral edges of the opening of the box-type member inner mold, respectively obtaining a first box-type member prefabricated body 5, a second box-type member prefabricated body 6 and a third box-type member prefabricated body 7, sewing the 3 box-type member prefabricated bodies on the outer walls of the corresponding box-type member inner molds, and locking the peripheral edges of the opening of the 3 box-type member prefabricated bodies;
1.2 A first exterior mold 702 and a second exterior mold 703 are installed on the outer surface of each box-shaped member preform with an interior mold, and then are sleeved on the exterior molds through 2 reinforcing frames 704 to fix, thereby completing the shaping of 3 box-shaped member preforms, as shown in fig. 1.
2) Shaping of skeleton preform
2.1 Positioning the second framework outer die 9 by using positioning pins, fixing the second framework outer die 9 in the concave groove of the first framework outer die 10 by using bolts, wherein the opening direction is consistent with the outer surface direction, the bottom surface extends out of the inner molded surface, and the peripheral edges of the opening are flush with the peripheral edges of the concave groove as shown in fig. 2;
2.2 With the inner surface of the first skeleton outer mold 10 as a reference, a first layer of carbon fiber cloth 1101 shaped like a straight line is laid on the inner surface, as shown in fig. 3, and the width of the first layer of carbon fiber cloth 1101 is the same as the bottom width of the second skeleton outer mold 9; a second layer of carbon fiber cloth 1102 shaped like an I is paved on the first layer of carbon fiber cloth 1101, as shown in fig. 4, no visible gap is ensured at the joint of the two layers of carbon fiber cloth, a layer of third layer of carbon fiber cloth shaped like a straight line is paved on the second layer of carbon fiber cloth 1102, wherein the width of the third layer of carbon fiber cloth is the same as the bottom width of the second framework outer die 9 and forms an included angle of 90 degrees with the first layer of carbon fiber cloth 1101, a layer of fourth layer of carbon fiber cloth shaped like an I is paved on the third layer of carbon fiber cloth, an included angle of 90 degrees is formed between the fourth layer of carbon fiber cloth and the second layer of carbon fiber cloth 1102, no visible gap is ensured at the joint of the third layer of carbon fiber cloth and the fourth layer of carbon fiber cloth, the carbon fiber cloth is fixed by an adhesive, the steps are repeated for a plurality of times until the thickness of the bottom carbon fiber cloth of the second framework outer die 9 is 6mm, the thickness of the inner surface of the first framework outer die 10 is 3mm, the framework prefabricated body 8 is obtained, the edge of the framework prefabricated body 8 and the inner surface of the first framework outer die 10 is enabled to be sewn together with the inner surface of the first framework body 10;
2.3 The first framework inner die 14, the second framework inner die 15 and the third framework inner die 16 are arranged in an I-shaped linear manner, and are positioned sequentially through positioning pins, and are fixed on the framework preform 8 through bolts, so that the edges of all end faces are flush with the edges of the framework preform 8; and then the openings of the fourth framework inner die 12 and the fifth framework inner die 13 are upwards, the bottom surfaces are positioned by positioning pins, and bolts are fixed on the left side and the right side of the second framework inner die 15, so that the shaping of the framework preform is completed, as shown in fig. 5.
3) CVI pre-carbon deposition
And respectively pre-depositing a carbon interface layer on the shaped box-shaped part prefabricated body and the framework prefabricated body 8 according to preset requirements, wherein the thickness of the carbon interface layer is 30nm.
4) Pre-carbon precipitation post-treatment
4.1 After pre-carbon deposition, removing the reinforcing frames 704 on the first box-type member preform 5, the second box-type member preform 6 and the third box-type member preform 7, and removing the first box-type member outer mold 702, the second box-type member outer mold 703 and the sewn and overlooked thread ends;
4.2 Removing the fourth skeleton inner mold 12, the fifth skeleton inner mold 13, the second skeleton outer mold 9, the first skeleton inner mold 14, the second skeleton inner mold 15, and the third skeleton inner mold 16 from the skeleton preform 8, and mounting the first box-type member preform 5 with the box-type member inner mold, the second box-type member preform 6 with the box-type member inner mold, and the third box-type member preform 7 with the box-type member inner mold to the corresponding positions of the fourth skeleton inner mold 12, the fifth skeleton inner mold 13, and the second skeleton outer mold 9, respectively, as shown in fig. 6 and 7;
4.3 The adjacent faces of the skeleton preform 8 and the 3 box-shaped member preforms with the box-shaped member inner molds are sewn, and then the L-shaped sewing grooves 20 corresponding to the adjacent faces among the 3 box-shaped member preforms with the box-shaped member inner molds are subjected to the opposite-penetrating sewing 17, as shown in fig. 8, wherein the L-shaped sewing grooves have the width of 2mm and the interval of 8mm, so that the sewn concave-like connecting member preform is obtained.
5) Again CVI carbon deposition
5.1 The first skeleton inner mold 14, the second skeleton inner mold 15, the third skeleton inner mold 16 are fixed again to the skeleton preform 8, positioned by positioning pins, and fixed by bolts, as shown in fig. 9;
5.2 Continuously depositing a carbon interface layer on the sewn concave-like connecting part preform according to preset requirements by adopting a CVI process.
6) Performing silicon carbide matrix deposition on the concave-like connecting part preform subjected to carbon interface layer deposition by adopting a CVI process according to preset requirements until the density of the concave-like connecting part preform reaches 1.85g/cm 3 ；
6.1 During the deposition of the silicon carbide substrate, when the density of the prefabricated body of the similar concave connecting part reaches the first preset density of 1.2g/cm 3 Dismantling the first framework inner die 14, the second framework inner die 15 and the third framework inner die 16;
6.2 When the density of the prefabricated body of the similar concave connecting component reaches the second preset density of 1.5g/cm 3 Dismantling the first framework outer die 10 and 3 box-type part inner dies;
6.3 Continuing the deposition until a density of 1.85g/cm was reached 3 When this is done, the deposition of the preform of the female-like connection member is completed, as shown in fig. 10.
7) Sizing
The density reaches 1.85g/cm 3 The concave-like ceramic matrix composite connecting part preform is processed, the positioning pin and the hole penetrating through the connecting part preform when the bolt is fixed are processed into a weight reduction cavity according to design requirements, and the whole outline dimension is processed according to design requirements, so that the concave-like ceramic matrix composite connecting part is obtained, as shown in fig. 11 to 13.
Example two
The application method of the concave-like ceramic matrix composite connecting part forming die comprises the following steps:
1) Shaping of box-shaped part preforms
1.1 Taking 3 box-type member inner molds with the same shape and structure, respectively paving a plurality of layers of carbon fiber cloth on the outer walls of the first box-type member inner mold 501, the second box-type member inner mold 601 and the third box-type member inner mold 701 until the thickness of the carbon fiber cloth reaches 2mm, fixing the carbon fiber cloth by using an adhesive, and obtaining a first box-type member prefabricated body 5, a second box-type member prefabricated body 6 and a third box-type member prefabricated body 7 by enabling the edges of the carbon fiber cloth to be flush with the edges of the opening of the box-type member inner mold, sewing the 3 box-type member prefabricated bodies on the outer walls of the corresponding box-type member inner molds, and performing edge locking on the edges around the opening of the 3 box-type member prefabricated bodies;
1.2 A first box-type part outer mold 702 and a second box-type part outer mold 703 are arranged on the outer surface of each box-type part prefabricated body with the box-type part inner mold, and then the first box-type part outer mold 702 and the second box-type part outer mold 703 are sleeved on the box-type part outer mold through 2 reinforcing frames 704 for fixing, so that the shaping of 3 box-type part prefabricated bodies is completed;
2) Shaping of skeleton preform
2.1 Positioning the second framework outer die 9 by using positioning pins, fixing the second framework outer die 9 in the concave groove of the first framework outer die 10 by using bolts, enabling the opening direction to be consistent with the outer surface direction, enabling the bottom surface to extend out of the inner molded surface, and enabling the peripheral edges of the opening to be flush with the peripheral edges of the concave groove;
2.2 A layer of first layer of carbon fiber cloth 1101 is paved on the inner surface of the first framework outer die 10 in a straight shape, and the width of the first layer of carbon fiber cloth 1101 is the same as the bottom width of the second framework outer die 9; a second layer of carbon fiber cloth 1102 shaped like an I is paved on the first layer of carbon fiber cloth, a third layer of carbon fiber cloth shaped like an I is paved on the second layer of carbon fiber cloth 1102, wherein the width of the third layer of carbon fiber cloth is the same as the bottom width of the second framework outer die 9, an included angle between the third layer of carbon fiber cloth and the first layer of carbon fiber cloth 1101 is 90 degrees, a fourth layer of carbon fiber cloth shaped like an I is paved on the third layer of carbon fiber cloth, an included angle between the fourth layer of carbon fiber cloth and the second layer of carbon fiber cloth 1102 is 90 degrees, no visible gap is reserved at the joint of each layer of carbon fiber cloth, the carbon fiber cloth is fixed by an adhesive until the thickness of the bottom carbon fiber cloth of the second framework outer die 9 is 4mm, the thickness of the inner-profile carbon fiber cloth is 2mm, layering is completed, a framework prefabricated body 8 is obtained, the edge of the framework prefabricated body 8 is enabled to be flush with the inner-profile edge of the first framework outer die 10, and the framework prefabricated body 8 is sewn with the inner-profile surface of the first framework outer die 10;
2.3 The first framework inner die 14, the second framework inner die 15 and the third framework inner die 16 are arranged in an I-shaped linear manner, and are positioned sequentially through positioning pins, and are fixed on the framework preform 8 through bolts, so that the edges of all end faces are flush with the edges of the framework preform 8; then the openings of the fourth framework internal mold 12 and the fifth framework internal mold 13 face upwards, the bottom surfaces are positioned by positioning pins, and bolts are fixed on the left side and the right side of the second framework internal mold 15, so that the shaping of the framework prefabricated body is completed;
3) CVI pre-carbon deposition
Respectively pre-depositing a carbon interface layer on the shaped box-shaped part prefabricated body and the framework prefabricated body 8 according to preset requirements, wherein the thickness of the carbon interface layer is 50nm;
4) Pre-carbon precipitation post-treatment
4.1 After pre-carbon deposition, removing the reinforcing frames 704 on the first box-type member preform 5, the second box-type member preform 6 and the third box-type member preform 7, and removing the first box-type member outer mold 702, the second box-type member outer mold 703 and the sewn and overlooked thread ends;
4.2 Removing the fourth framework inner die 12, the fifth framework inner die 13, the second framework outer die 9, the first framework inner die 14, the second framework inner die 15 and the third framework inner die 16 on the framework prefabricated body 8, enabling the openings of the 3 box-shaped member prefabricated bodies with the box-shaped member inner dies to face upwards, and fixing the bottom surfaces of the box-shaped member prefabricated bodies to corresponding positions of the fourth framework inner die 12, the fifth framework inner die 13 and the second framework outer die 9 through positioning pins and bolts respectively;
4.3 Sewing adjacent surfaces of the framework preform 8 and 3 box-shaped part preforms with the box-shaped part inner molds, and then carrying out opposite-penetrating sewing 17 on L-shaped sewing grooves 20 corresponding to the adjacent surfaces among the 3 box-shaped part preforms with the box-shaped part inner molds, wherein the width of the L-shaped sewing grooves is 3mm, and the distance is 10mm, so as to obtain the sewn concave-like connecting part preform.
5) Again CVI carbon deposition
5.1 A first framework inner mold 14, a second framework inner mold 15, a third framework inner mold 16 are again fixed to the framework preform 8;
5.2 Continuously depositing a carbon interface layer on the sewn concave-like connecting part preform by adopting a CVI process according to preset requirements.
6) Performing silicon carbide matrix deposition on the concave-like connecting part preform subjected to carbon interface layer deposition by adopting a CVI process according to preset requirements until the density of the concave-like connecting part preform reaches 1.88g/cm 3 ；
6.1 During deposition of the silicon carbide substrate, when the connection is similar to a concave connectionThe density of the component preform reaches the first preset density of 1.25g/cm 3 Dismantling the first framework inner die 14, the second framework inner die 15 and the third framework inner die 16;
6.2 When the density of the prefabricated body of the similar concave connecting component reaches the second preset density of 1.45g/cm 3 Dismantling the first framework outer die 10 and 3 box-type part inner dies;
6.3 Continuing deposition until a density of 1.88g/cm At 3 hours And completing the deposition of the prefabricated body of the similar concave connecting part.
7) Sizing
The density reaches 1.88g/cm 3 The concave-like ceramic matrix composite connecting part prefabricated body is processed, the positioning pin and the hole penetrating through the connecting part prefabricated body when the bolt is fixed are processed into a weight reduction cavity according to the design requirement, and the whole outline dimension is processed according to the design requirement, so that the concave-like ceramic matrix composite connecting part is obtained.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.

Claims (6)

1. A kind of concave ceramic matrix composite link forming die, its characterized in that:
comprises a skeleton carbon deposition tool and a box-type part carbon deposition tool;
the box-type part carbon deposition tool comprises at least one box-type part inner die and a plurality of box-type part outer dies;
the shape of the outer die of the box-shaped part is matched with the shape of the inner die of the box-shaped part;
the processing cavity between the box-shaped part inner die and the box-shaped part outer die is used for processing a box-shaped part prefabricated body in the connecting part;
the box-shaped part inner mold and the box-shaped part outer mold are fixed through a reinforcing frame (704);
a plurality of L-shaped sewing grooves (20) are uniformly formed in the periphery of the bottom of the box-shaped part inner die;
the framework carbon sinking tooling comprises a first framework outer die (10), a second framework outer die (9), a first framework inner die (14), a second framework inner die (15), a third framework inner die (16), a fourth framework inner die (12) and a fifth framework inner die (13); the first framework outer die (10) is similar to a concave shape, the outer profile is a convex side, the inner profile is a concave side, and the shape of the inner profile is matched with the shape of a framework prefabricated body in the connecting part; the inner molded surface is provided with a concave groove penetrating through the first framework outer mold (10), and the shape of the concave groove is matched with the shape of the second framework outer mold (9);
the second framework outer die (9) is fixed in the concave groove of the first framework outer die (10), the bottom surface of the second framework outer die extends out of the inner molded surface, and the peripheral edge of the opening is flush with the peripheral edge of the concave groove;
the first framework inner die (14), the second framework inner die (15) and the third framework inner die (16) are linearly distributed in an I shape and are sequentially fixed on the inner molded surface of the first framework outer die (10); the first framework inner die (14) and the third framework inner die (16) are respectively positioned at the upper side and the lower side of the second framework inner die (15); the fourth framework inner die (12) and the fifth framework inner die (13) are fixed on the inner molded surface of the first framework outer die (10) and are respectively positioned at the left side and the right side of the second framework inner die (15); the shape of the second framework inner die (15) is matched with the shape of the bottom of the second framework outer die (9),
the shapes of the second framework outer die (9), the fourth framework inner die (12) and the fifth framework inner die (13) are matched with the shapes of the box-shaped part prefabricated bodies.
2. The concave-type ceramic matrix composite connecting member molding die according to claim 1, wherein:
the number of the box-shaped part carbon deposition tools is 3, and the box-shaped part carbon deposition tools are identical in shape and structure.
3. The concave-type ceramic matrix composite connecting member molding die according to claim 2, wherein:
the L-shaped sewing groove (20) has a groove width of 2-3mm and a spacing of 8-10mm.
4. A female-type ceramic matrix composite connecting member forming mold as claimed in claim 3 wherein:
the framework carbon deposition tool and the box-type part carbon deposition tool are respectively provided with a plurality of positioning pin holes (18) and bolt holes (19) for fixing.
5. A method of using a female-type ceramic matrix composite connecting member forming mold as claimed in any one of claims 1 to 4, comprising the steps of:
step 1, shaping of a box-shaped part preform
Step 1.1, taking 3 box-type piece inner molds with the same shape and structure, respectively paving a plurality of layers of carbon fiber cloth on the outer walls of a first box-type piece inner mold (501), a second box-type piece inner mold (601) and a third box-type piece inner mold (701), fixing the carbon fiber cloth by using an adhesive, and obtaining a first box-type piece prefabricated body (5), a second box-type piece prefabricated body (6) and a third box-type piece prefabricated body (7) by enabling the edges of the carbon fiber cloth to be flush with the peripheral edges of the opening of the box-type piece inner mold, sewing the 3 box-type piece prefabricated bodies on the outer walls of the corresponding box-type piece inner molds, and locking the peripheral edges of the opening of the 3 box-type piece prefabricated bodies;
step 1.2, installing a first box-type part outer mold (702) and a second box-type part outer mold (703) on the outer surface of each box-type part prefabricated body with a box-type part inner mold, and fixing through 2 reinforcing frames (704), thereby completing the shaping of 3 box-type part prefabricated bodies;
step 2, shaping the skeleton preform
Step 2.1, positioning the second framework outer die (9) by using a positioning pin, fixing a bolt in a concave groove of the first framework outer die (10), enabling the opening direction to be consistent with the shape surface direction, enabling the bottom surface to extend out of the inner molded surface, and enabling the peripheral edges of the opening to be flush with the peripheral edges of the concave groove;
step 2.2, a layer of first-layer carbon fiber cloth (1101) shaped like a straight line is paved on the inner surface of the first framework outer die (10), and the width of the first-layer carbon fiber cloth (1101) is the same as the bottom width of the second framework outer die (9); a layer of second carbon fiber cloth (1102) shaped like an I is paved on the first layer of carbon fiber cloth, a layer of third carbon fiber cloth shaped like an I is paved on the second layer of carbon fiber cloth (1102), the width of the third layer of carbon fiber cloth is the same as the width of the bottom of the second framework outer die (9), an included angle between the third layer of carbon fiber cloth and the first layer of carbon fiber cloth (1101) is 90 degrees, a layer of fourth carbon fiber cloth shaped like an I is paved on the third layer of carbon fiber cloth, an included angle between the fourth layer of carbon fiber cloth and the second layer of carbon fiber cloth (1102) is 90 degrees, no visible gap is reserved at the joint of each layer of carbon fiber cloth, the carbon fiber cloth is fixed by an adhesive, the layering is repeated for a plurality of times, a framework preform (8) is obtained, the edge of the framework preform (8) is enabled to be flush with the edge of the inner surface of the first framework outer die (10), and the framework preform (8) is sewn on the inner surface of the first framework outer die (10);
step 2.3, arranging the first framework inner die (14), the second framework inner die (15) and the third framework inner die (16) in an I-shaped linear manner, positioning by positioning pins sequentially, and fixing bolts on the framework preform (8) to ensure that the edges of all end surfaces are flush with the edges of the framework preform (8); then the openings of the fourth framework internal mold (12) and the fifth framework internal mold (13) are upwards, the bottom surfaces are positioned by positioning pins, and bolts are fixed on the left side and the right side of the second framework internal mold (15), so that the shaping of the framework prefabricated body is completed;
step 3, CVI pre-carbon deposition
Respectively pre-depositing a carbon interface layer on the box-shaped part prefabricated body and the framework prefabricated body which are subjected to shaping according to preset requirements, wherein the thickness of the carbon interface layer is 30-50nm;
step 4, pre-carbon precipitation post-treatment
Step 4.1, after pre-carbon deposition, removing the reinforcing frame (704), and removing the outer die of the box-type part, sewing and overlock thread ends;
step 4.2, dismantling a fourth framework inner die (12), a fifth framework inner die (13), a second framework outer die (9), a first framework inner die (14), a second framework inner die (15) and a third framework inner die (16), enabling the openings of 3 box-shaped part prefabricated bodies with box-shaped part inner dies to face upwards, and fixing the bottom surfaces of the box-shaped part prefabricated bodies to corresponding positions of the fourth framework inner die (12), the fifth framework inner die (13) and the second framework outer die (9) through positioning pins and bolts respectively;
step 4.3, sewing adjacent surfaces of the skeleton prefabricated body (8) and the 3 box-shaped piece prefabricated bodies with the box-shaped piece inner molds, and then carrying out through sewing (17) on L-shaped sewing grooves (20) corresponding to the adjacent surfaces among the 3 box-shaped piece prefabricated bodies with the box-shaped piece inner molds, so as to obtain a sewn concave-like connecting part prefabricated body, wherein the through sewing (17) is to sew two opposite sewing grooves;
step 5, CVI carbon deposition is carried out again
Step 5.1, fixing the first framework inner die (14), the second framework inner die (15) and the third framework inner die (16) on the framework preform (8) again;
step 5.2, adopting a CVI process to deposit a carbon interface layer according to design requirements;
step 6, adopting a CVI process to deposit a silicon carbide substrate on the concave-like connecting part preform subjected to carbon interface layer deposition according to preset requirements until the preset required specified density is reached, and removing a die on the connecting part;
step 7, machining the dimension specification
Processing the concave-like ceramic matrix composite connecting part prefabricated body reaching the specified density, processing a positioning pin and a hole penetrating through the connecting part prefabricated body when being fixed by a bolt into a weight reduction cavity (21) according to design requirements, and processing the whole outline size according to preset requirements to obtain the concave-like ceramic matrix composite connecting part comprising the first box-shaped part (1), the second box-shaped part (2), the third box-shaped part (3) and the framework (4).
6. The method of using a mold for forming a concave-like ceramic matrix composite connecting member according to claim 5, wherein step 6 specifically comprises:
6.1 The density of the prefabricated body of the similar concave connecting part reaches a first preset density, and the first framework inner die (14), the second framework inner die (15) and the third framework inner die (16) are removed;
6.2 The density of the prefabricated body of the similar concave connecting part reaches a second preset density, and the first framework outer die (10) and the 3 box-shaped part inner dies are removed;
6.3 Continuing to deposit until the density of the prefabricated body of the similar concave connecting part reaches the final preset density, and finishing the deposition.
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