A ring-shaped composite material preparation tool capable of increasing deposition density uniformity

Abstract

A kind of ring composite material preparation tool that can increase deposition density uniformity, including ring piece of porous body, also include top cover, base and outer cylinder assembly;The outer cylinder assembly includes several outer cylinders;Ring piece assembly sleeve is placed in the outer cylinder assembly, and spacer ring is placed between adjacent ring piece;Gas inlet pipe is connected on the top cover;Gas outlet is opened on the base;Top spacer ring is connected between the ring piece assembly sleeve and top cover;The space in the outer cylinder assembly is divided into inner cavity and outer cavity by the ring piece assembly sleeve, spacer ring and top spacer ring;The outer cavity is communicated with gas outlet;The inner cavity is communicated with gas inlet pipe;Inner column assembly is placed in the ring piece assembly sleeve.The utility model can evenly ring piece surface flow field, improve the gas amount that permeates into ring piece inside, reduce ring piece inside and surface gas amount difference, improve the problem of ring composite material overall density unevenness.

Description

Technical Field

[0001] This utility model relates to the field of chemical vapor infiltration technology, specifically to a tooling for preparing cyclic composite materials that can increase the uniformity of deposition density. Background Technology

[0002] Chemical vapor infiltration (CVI) is a key process for preparing high-performance composite materials in the aerospace field. It achieves material densification by depositing gaseous reaction products on the surface and inside of porous preforms. This process is widely used in the preparation of carbon / carbon composites and silicon carbide ceramic matrix composites, and the net-shape forming of complex components can be achieved by controlling parameters such as temperature field and pressure gradient. When using CVI to prepare cyclic composites, multiple cyclic components are usually stacked. Under high temperature, gas flows through the cyclic components, reacting and forming deposits on the surface and in the internal pores of the cyclic components. Cyclic composites prepared using existing technologies suffer from uneven overall density. The main reason for this problem is that during deposition, the gas flows through the cyclic components, resulting in an uneven flow field on the outer surface of the cyclic components. Furthermore, only a small amount of gas can penetrate into the interior of the cyclic components through their own pores, leading to a large difference in gas volume between the interior and surface of the cyclic components, resulting in uneven overall density. Utility Model Content

[0003] The present invention aims to provide a tooling for preparing annular composite materials that can increase the uniformity of deposition density. This tooling can uniformize the flow field on the surface of the annular part, increase the amount of gas penetrating into the interior of the annular part, reduce the difference in gas volume between the interior and surface of the annular part, and improve the problem of uneven overall density of the annular composite material.

[0004] To solve the above-mentioned technical problems, the present invention provides a technical solution for a tooling system for preparing cyclic composite materials that can increase the uniformity of deposition density:

[0005] The device includes a porous annular component, a top cover, a base, and an outer cylinder assembly placed between the top cover and the base. The outer cylinder assembly comprises several vertically stacked outer cylinders. An annular component assembly sleeve, consisting of multiple vertically stacked annular components, is placed inside the outer cylinder assembly, with spacers placed between adjacent annular components. An air inlet pipe is connected to the top cover. A gas outlet is provided on the base. A top spacer ring connects the annular component assembly sleeve and the top cover. The annular component assembly sleeve, spacers, and top spacer ring divide the space within the outer cylinder assembly into an inner cavity and an outer cavity. The outer cavity communicates with the gas outlet. The inner cavity communicates with the air inlet pipe. An inner column assembly is placed inside the annular component assembly sleeve.

[0006] The inner column assembly consists of several vertically stacked inner columns, and the number of inner columns is the same as the number of outer cylinders.

[0007] The distance between the outer wall of the inner column and the inner wall of the annular component is the same as the distance between the inner wall of the outer cylinder and the outer wall of the annular component.

[0008] The inner diameter of the washer ring, the inner diameter of the top washer ring, and the inner diameter of the ring-shaped member are the same, and the washer ring, the top washer ring, and the ring-shaped member are coaxial.

[0009] The washer ring and the top washer ring are solid parts.

[0010] Five ring-shaped pieces are placed inside each of the outer cylinders.

[0011] The technical effects that this utility model can achieve are:

[0012] 1. In the preparation of cyclic composite materials using chemical vapor infiltration technology, the gas can flow uniformly across the surface of the cyclic component, increasing the amount of gas penetrating into the interior of the cyclic component, reducing the gas volume difference between the interior and surface of the cyclic component, and allowing the gas to uniformly generate deposits on the surface and in the internal pores of the cyclic component, thereby improving the problem of uneven overall density of the cyclic composite material.

[0013] 2. The outer cylinder assembly of this utility model includes several outer cylinders stacked vertically together. Therefore, this utility model can stack different numbers of outer cylinders according to the requirements. When the number of stacked outer cylinders is greater, the number of annular parts that can be placed inside the outer cylinder assembly is also greater (that is, the number of annular parts that can be permeated at the same time is also greater). Attached Figure Description

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0015] Figure 1 This is a schematic diagram of the structure of a ring-shaped composite material preparation tool that can increase the uniformity of deposition density according to this utility model (the outer cylinder assembly has only one outer cylinder);

[0016] Figure 2 This is a schematic diagram of the structure of a ring-shaped composite material preparation tool that can increase the uniformity of deposition density according to this utility model (the outer cylinder assembly has two outer cylinders);

[0017] Figure 3 This is a schematic diagram of the structure of a ring-shaped composite material preparation tool that can increase the uniformity of deposition density according to this utility model (the outer cylinder assembly has four outer cylinders). Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] See Figures 1 to 3 .

[0020] A tooling for preparing annular composite materials that can increase the uniformity of deposition density includes a porous annular component 1, a top cover 2, a base 3, and an outer cylinder assembly placed between the top cover 2 and the base 3. The outer cylinder assembly includes several vertically stacked outer cylinders 4. An annular component assembly sleeve composed of several vertically stacked annular components 1 is placed inside the outer cylinder assembly, and a gasket 5 is placed between adjacent annular components 1. An air inlet pipe 6 is connected to the top cover 2, and a gas outlet 7 is provided on the base 3. A top gasket 8 is connected between the annular component assembly sleeve and the top cover 2. The annular component assembly sleeve, the gasket 5, and the top gasket 8 divide the space inside the outer cylinder assembly into an inner cavity 9 and an outer cavity 10. The outer cavity 10 communicates with the gas outlet 7, and the inner cavity 9 communicates with the air inlet pipe 6. An inner column assembly is placed inside the annular component assembly sleeve. Specifically, the inner column assembly is composed of several vertically stacked inner columns 11, and the number of inner columns 11 is the same as the number of outer cylinders 4.

[0021] The purpose of this utility model, which combines the top cover 2, the outer cylinder assembly, and the base 3, is to ensure unidirectional gas flow (see reference). Figure 1 That is, gas flows in through the inlet pipe 6 of the top cover 2 and flows out through the gas outlet 7 of the base 3, which restricts the gas flow space and flow direction, and increases the utilization rate of gas.

[0022] In the design of the base 3 and the top cover 2, the base is the main load-bearing component and is thickened to increase safety; the main function of the top cover 2 is to limit the gas flow space and is thinned to reduce the load on the base. Therefore, the base 3 is thick and the top cover 2 is thin.

[0023] In this invention, a gasket 5 is placed between adjacent annular components 1 to separate the annular components 1 and increase the contact area between the annular components 1 and the gas. Furthermore, the gas flow area is divided into inner and outer sides, namely, an inner cavity 9 and an outer cavity 10, with the annular components 1, top gasket 8, and gasket 5 as boundaries. The outer cavity 10 communicates with the gas outlet 7, and the inner cavity 9 communicates with the gas inlet pipe 6. Gasket 5 and top gasket 8 are solid components, and the pores of the annular component 1 itself become the only airflow channel connecting the inner cavity 9 and the outer cavity 10. The specific gas flow direction is as follows: Figure 1 As shown, the purpose is to define the gas flow path, force the gas to flow into the internal pores of the annular component 1, increase the amount of gas penetrating into the interior of the annular component 1, reduce the gas volume difference between the interior and surface of the annular component 1, and thus increase the density uniformity between the interior and surface of the annular component 1.

[0024] The distance between the outer wall of the inner column 11 and the inner wall of the annular member 1 is the same as the distance between the inner wall of the outer cylinder 4 and the outer wall of the annular member 1. The middle diameters of the gasket 5 and the top gasket 8 are the same as the middle diameter of the annular member 1 (middle diameter = (inner diameter + outer diameter) / 2), and the gasket 5, the top gasket 8, and the annular member 1 are coaxial. Figure 1As shown, the purpose is to uniformly distribute the gas flow space on both the inner and outer sides of the annular part 1, increase the uniformity of the flow field on the surface of the annular part 1, and thus increase the uniformity of the surface density of the annular part 1.

[0025] The outer cylinder assembly includes several vertically stacked outer cylinders 4, wherein the top of the uppermost outer cylinder 4 does not have a slot for stacking (see reference). Figure 1 , 2 3) The inner column assembly consists of several vertically stacked inner columns 11, and the number of inner columns 11 is the same as the number of outer cylinders 4. The top of the uppermost inner column 11 does not have a slot for stacking (see reference). Figure 1 , 2 3) The purpose of the above-mentioned stacked structure design is to increase the degree of freedom in the preparation of the number of ring-shaped parts 1; preferably, five ring-shaped parts 1 are placed inside each outer cylinder 4. For example, five ring-shaped parts can be prepared using only one outer cylinder 4 and one inner column 11. Figure 1 As shown, for each additional outer cylinder 4 and inner column 11, 5 more annular components can be manufactured. Figure 1 , 2 As shown in Figure 3.

Claims

1. A tooling for preparing annular composite materials that can increase the uniformity of deposition density, comprising an annular component (1) in the form of a porous body, characterized in that: It also includes a top cover (2), a base (3), and an outer cylinder assembly placed between the top cover (2) and the base (3); the outer cylinder assembly includes several vertically stacked outer cylinders (4); an annular component assembly sleeve consisting of multiple annular components (1) stacked vertically is placed inside the outer cylinder assembly, and a gasket (5) is placed between adjacent annular components (1); an air inlet pipe (6) is connected to the top cover (2); a gas outlet (7) is opened on the base (3); a top gasket (8) is connected between the annular component assembly sleeve and the top cover (2); the annular component assembly sleeve, gasket (5), and top gasket (8) divide the space inside the outer cylinder assembly into an inner cavity (9) and an outer cavity (10); the outer cavity (10) communicates with the gas outlet (7); the inner cavity (9) communicates with the air inlet pipe (6); an inner column assembly is placed inside the annular component assembly sleeve.

2. The tooling for preparing a ring-shaped composite material according to claim 1, characterized in that: The inner column assembly consists of several vertically stacked inner columns (11), and the number of inner columns (11) is the same as the number of outer cylinders (4).

3. The tooling for preparing a ring-shaped composite material according to claim 2, characterized in that: The distance between the outer wall of the inner column (11) and the inner wall of the annular member (1) is the same as the distance between the inner wall of the outer cylinder (4) and the outer wall of the annular member (1).

4. The tooling for preparing a ring-shaped composite material according to claim 1, characterized in that: The inner diameter of the pad ring (5), the inner diameter of the top pad ring (8) and the inner diameter of the ring (1) are the same, and the pad ring (5), the top pad ring (8) and the ring (1) are coaxial.

5. The tooling for preparing a ring-shaped composite material according to claim 1, characterized in that: The washer ring (5) and the top washer ring (8) are solid parts.

6. The tooling for preparing a ring-shaped composite material according to claim 1, characterized in that: Five annular pieces (1) are placed inside each of the outer cylinders (4).

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