Pressure infiltration mold tool for preparing silicon carbide aluminum-based material
By designing non-horizontal casting ports and block-assembled pressure-impregnation mold tools, the thickness unevenness and warpage of the sheet-shaped silicon carbide-based material castings are solved, and the uniformity of the castings and high-quality casting is achieved.
Patent Information
- Application Number
- CN202422314124.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The existing mold design has resulted in inconsistent thickness of the aluminum layer on and below the sheet-shaped silicon carbide-based castings, and the warping problem after heat treatment of large-sized materials has not been effectively solved.
A pressure-impregnation mold tool is designed, including a graphite encapsulated shell and a removable aluminum liquid impregnation module. The casting port of the molding cavity extends upwards, the sides of the molding cavity are non-horizontal, and multiple molding cavity are used and assembled in blocks for a tight fit, ensuring that the metal liquid is full and providing uniform pressure when solidified.
Through gravity and the shrinkage effect of fluid metal liquid, we ensure uniformity of casting thickness, prevent warping, and improve casting quality.
Smart Images
Figure CN223114150U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of preparation of silicon carbide aluminum matrix materials, and particularly relates to a pressure infiltration die tooling for preparing silicon carbide aluminum matrix materials. Background Art
[0002] High-volumetric-fraction silicon carbide aluminum matrix materials (silicon carbide content: 55 vol% - 70 vol%) have excellent thermal and mechanical properties, and are ceramic metal matrix composites for electronic component packaging obtained by pressure-infiltrating high-temperature conditioned aluminum liquid into porous silicon carbide ceramics with high-pressure gas. During the preparation of silicon carbide aluminum matrix materials, the structural design of the infiltration die tooling is a key preparation link, which determines the rate of aluminum liquid infiltrating into the pores of silicon carbide ceramics and the aluminum coating thickness and shape on the periphery of the silicon carbide aluminum matrix materials, and further affects the setting and distribution of the temperature field during the heat treatment of the materials and whether the products warp or not. However, most of the existing dies use single-sided direct infiltration of aluminum liquid, and the sheet-shaped silicon carbide aluminum matrix material castings are in a horizontal state, which results in uneven aluminum layer thickness on the upper and lower surfaces of the sheet-shaped silicon carbide aluminum matrix material castings and warping problems of large-size material castings after heat treatment, which need to be solved urgently. Summary of the Invention
[0003] In order to solve the problems existing in the prior art, the purpose of the utility model is to provide a pressure infiltration die tooling for preparing silicon carbide aluminum matrix materials, which can effectively solve the problems of uneven aluminum layer thickness on the upper and lower surfaces of sheet-shaped silicon carbide aluminum matrix material castings and warping problems of large-size material castings after heat treatment.
[0004] The technical solution adopted by the utility model is as follows:
[0005] A pressure infiltration die tooling for preparing silicon carbide aluminum matrix materials, comprising a graphite encapsulation housing, a module installation cavity is arranged in the graphite encapsulation housing, and an aluminum liquid infiltration module is detachably arranged in the module installation cavity. A forming cavity for casting sheet-shaped castings is arranged in the aluminum liquid infiltration module, the casting port of the forming cavity extends upward to the upper surface of the aluminum liquid infiltration module, and the side surface of the forming cavity is non-horizontal.
[0006] Preferably, a plurality of the forming cavities which are parallel to each other or distributed in an array are arranged in the aluminum liquid infiltration module.
[0007] Preferably, the aluminum liquid infiltration module is divided into several blocks at the forming cavity. When the several blocks are assembled, the aluminum liquid infiltration module is formed, and the side surface of the aluminum liquid infiltration module can be closely attached to the inner wall of the module installation cavity.
[0008] Preferably, among the several sub-blocks, there are a first infiltration sub-block, a second infiltration sub-block, and a third infiltration sub-block. A first groove is formed on one side surface of the first infiltration sub-block, and the upper end of the first groove extends to the upper end surface of the first infiltration sub-block. One side surface of the second infiltration sub-block can closely adhere to the side surface of the first infiltration sub-block and seal the side surface of the first groove to form a first molding cavity for casting a sheet-shaped casting. A second groove is formed on the other side surface of the second infiltration sub-block, and the upper end of the second groove extends to the upper end surface of the second infiltration sub-block. One side surface of the third infiltration sub-block can closely adhere to the side surface of the second infiltration sub-block and seal the side surface of the second groove to form a second molding cavity for casting a sheet-shaped casting.
[0009] Preferably, a third groove is formed on the surface of the second infiltration sub-block facing the first infiltration sub-block, and the third groove and the first groove together form the first molding cavity.
[0010] Preferably, a fourth groove is formed on the surface of the third infiltration sub-block facing the second infiltration sub-block, and the fourth groove and the second groove together form the second molding cavity.
[0011] Preferably, a plurality of the second infiltration sub-blocks are repeatedly arranged between the first infiltration sub-block and the third infiltration sub-block.
[0012] Preferably, the overall shape of the aluminum liquid infiltration module is a cuboid. The overall shapes of the first infiltration sub-block, the second infiltration sub-block, and the third infiltration sub-block are all sheet-shaped rectangles. The module installation cavity is a cuboid-shaped cavity with an upper opening adapted to the outer shape of the aluminum liquid infiltration module.
[0013] Preferably, the structure of the graphite encapsulation housing is split. The graphite encapsulation housing is split into a first outer frame and a second outer frame from the module installation cavity. When the first outer frame and the second outer frame are assembled, a module installation cavity without an upper bottom and a lower bottom is formed at the joint of the first outer frame and the second outer frame.
[0014] Preferably, the pressure infiltration die tooling for preparing the aluminum matrix composite material with silicon carbide of the present invention further includes a base. The first outer frame and the second outer frame can be detachably and fixedly installed on the base. A flat plate for sealing the lower opening of the module installation cavity is provided between the bottoms of the first outer frame and the second outer frame and the base.
[0015] The present invention has the following beneficial effects:
[0016] In the pressure infiltration die tooling for preparing silicon carbide aluminum matrix materials of the present utility model, the casting port of the forming cavity extends upward to the upper surface of the aluminum liquid infiltration module, and the side surface of the forming cavity is non-horizontal. Therefore, during casting, the molten metal will enter the forming cavity under the action of gravity from the upper casting port, which helps the molten metal to fill the forming cavity and the gas to float upward, thereby helping to improve the casting quality. In addition, the side surface of the forming cavity is non-horizontal, that is to say, when the sheet-shaped casting to be cast is in the casting process, its orientation is non-horizontal (such as in a vertical or inclined state, preferably in a vertical state). At this time, due to the gravity of the molten metal, the cavity surface of the aluminum liquid infiltration module will always exert a force on the side surface of the sheet-shaped casting. And because the molten metal has fluidity, under the action of gravity, when the molten metal solidifies, the molten metal will make up for shrinkage in time. Therefore, the side surface of the sheet-shaped casting will not shrink and deform along the thickness direction of the sheet-shaped casting as the molten metal solidifies, thus ensuring the uniformity of the thickness of the sheet-shaped casting and preventing the warping problem of the sheet-shaped casting after cooling. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a schematic structural diagram of the pressure infiltration die tooling for preparing silicon carbide aluminum matrix materials in an embodiment of the present utility model;
[0018] Figure 2 is a schematic diagram of the first outer frame or the second outer frame in an embodiment of the utility model;
[0019] Figure 3 is a schematic diagram of the first infiltration sub-block in an embodiment of the utility model;
[0020] Figure 4 is a schematic diagram of the second infiltration sub-block in an embodiment of the utility model;
[0021] Figure 5 is a schematic diagram of the third infiltration sub-block in an embodiment of the utility model.
[0022] In the figure, 1 - graphite encapsulation housing, 1-1 - first outer frame, 1-2 - second outer frame, 1-3 - module installation cavity, 2 - aluminum liquid infiltration module, 2-1 - first infiltration sub-block, 2-1-1 - first groove, 2-2 - second infiltration sub-block, 2-2-1 - second groove, 2-2-2 - third groove, 2-3 - third infiltration sub-block, 2-3-1 - fourth groove, 2-4 - first forming cavity, 2-5 - second forming cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] The following will further illustrate the present utility model in conjunction with the drawings and embodiments.
[0024] See Figure 1, in this embodiment, a pressure infiltration die tooling for preparing a silicon carbide aluminum matrix material is provided, including a graphite encapsulation housing 1. A module installation cavity 1-3 is provided in the graphite encapsulation housing 1. A molten aluminum infiltration module 2 is detachably arranged in the module installation cavity 1-3 ( Figure 1 The molten aluminum infiltration module 2 shown in is only a partial schematic diagram of the molten aluminum infiltration module 2, not all of it). A forming cavity for casting sheet-shaped castings (such as the first forming cavity 2-4 and the second forming cavity 2-5) is provided in the molten aluminum infiltration module 2. The casting ports of the forming cavity (such as the openings on the upper sides of the first forming cavity 2-4 and the second forming cavity 2-5) extend upward to the upper surface of the molten aluminum infiltration module 2, and the side surfaces of the forming cavity are non-horizontal. Among them, one or more forming cavities can be provided, which can be set according to actual needs, and the present utility model does not make specific limitations.
[0025] When the above-mentioned pressure infiltration die tooling for preparing a silicon carbide aluminum matrix material in this embodiment is in use, the molten aluminum infiltration module 2 is loaded into the block installation cavity 1-3, and at the same time, the casting ports of the forming cavity are upward, and then molten metal is poured into the forming cavity from the casting ports of the forming cavity.
[0026] On the basis of the above embodiment, in this embodiment, when multiple forming cavities are provided in the molten aluminum infiltration module 2, for the convenience of pouring and to improve the pouring efficiency as much as possible, the multiple forming cavities are arranged in a row (or a line) parallel to each other, or in an array distribution form. Those skilled in the art can set according to the actual situation, and the present utility model does not make specific limitations. And Figure 1 In the illustrated embodiment, the multiple forming cavities are arranged in a row.
[0027] On the basis of the above embodiment, referring to Figure 1 , in this embodiment, the molten aluminum infiltration module 2 is divided into several sub-blocks at the forming cavity. When the several sub-blocks are assembled, the molten aluminum infiltration module 2 is formed, and the side surface of the molten aluminum infiltration module 2 can be closely attached to the inner wall of the module installation cavity 1-3. After casting, the molten aluminum infiltration module 2 can be disassembled into several sub-blocks, which is convenient for removing the formed sheet-shaped castings.
[0028] As a preferred implementation of the above solution, referring to Figures 1 - 5 , in this embodiment, the several sub-blocks include a first infiltration sub-block 2-1, a second infiltration sub-block 2-2, and a third infiltration sub-block 2-3, in order to Figure 1 and Figure 3Taking the shown orientation as an example, a first groove 2-1-1 is formed on the right side surface of the first infiltration block 2-1. The upper end of the first groove 2-1-1 extends to the upper end surface of the first infiltration block 2-1. The left side surface of the second infiltration block 2-2 can be closely attached to the right side surface of the first infiltration block 2-1 to seal the side surface of the first groove 2-1-1 and form a first molding cavity 2-4 for casting a sheet-like casting, as Figure 1 shown. Taking Figure 1 the shown orientation as an example and combining with Figure 4 , a second groove 2-2-1 is formed on the right side surface of the second infiltration block 2-2. The upper end of the second groove 2-2-1 extends to the upper end surface of the second infiltration block 2-2. The left side surface of the third infiltration block 2-3 can be closely attached to the right side surface of the second infiltration block 2-2 to seal the side surface of the second groove 2-2-1 and form a second molding cavity 2-5 for casting a sheet-like casting. Among them, after the above-mentioned first infiltration block 2-1, second infiltration block 2-2, and third infiltration block 2-3 are combined together, they can be used as a unit of the molten aluminum infiltration module 2. The molten aluminum infiltration module 2 can be composed of one such unit or multiple such units; when the molten aluminum infiltration module 2 is composed of one such unit, the left side surface of the first infiltration block 2-1 should be in close contact with the left side surface of the module installation cavity 1-3, and the right side surface of the third infiltration block 2-3 should be in close contact with the right side surface of the module installation cavity 1-3. When the molten aluminum infiltration module 2 is composed of multiple such units, multiple such units are arranged in sequence from left to right in the module installation cavity 1-3, and the right side surface of the third infiltration block 2-3 of the adjacent unit is in close contact with the left side surface of the first infiltration block 2-1. The left side surface of the first infiltration block 2-1 of the leftmost unit is in close contact with the left side surface of the module installation cavity 1-3, and the right side surface of the third infiltration block 2-3 of the leftmost unit is in close contact with the right side surface of the module installation cavity 1-3. The close contact setting between the above-mentioned adjacent surfaces is to prevent leakage of liquid in the molding cavity on the one hand, so that the sheet-like casting generates flash and the thickness direction dimensions are unqualified and uneven; on the other hand, it can also apply a certain pressure to the axial direction (taking the orientation shown in Figure 1 ) of the entire molten aluminum infiltration module 2 in the left-right direction, so as to ensure the size of the molding cavity during casting and ensure the uniformity of the thickness of the sheet-like casting. The mutually contacting surfaces of the above-mentioned first infiltration block 2-1, second infiltration block 2-2, and third infiltration block 2-3 are as smooth as possible, so as to achieve a good sealing effect and prevent or minimize the formation of flash.
[0029] As a preferred implementation of the above solution, refer to Figure 1 , Figure 3 and Figure 4, in this embodiment, a third groove 2-2-2 is formed on the surface of the second impregnation block 2-2 facing the first impregnation block 2-1, and the third groove 2-2-2 and the first groove 2-1-1 together form the first molding cavity 2-4. This structural design helps with demolding after casting. Specifically, during demolding, after separating the second impregnation block 2-2 and the first impregnation block 2-1, a part of the sheet-shaped casting will protrude from the third groove 2-2-2 or the first groove 2-1-1 in the thickness direction. At this time, it is easy to separate the sheet-shaped casting from the second impregnation block 2-2 or the first impregnation block 2-1. Therefore, the design of the above structure can well prevent the problem that the sheet-shaped casting is embedded in the groove and difficult to take out.
[0030] As a preferred implementation of the above solution, see Figure 1 , Figure 4 and Figure 5 , in this embodiment, a fourth groove 2-3-1 is formed on the surface of the third impregnation block 2-3 facing the second impregnation block 2-2, and the fourth groove 2-3-1 and the second groove 2-2-1 together form the second molding cavity 2-5. This design has the same purpose and function as the previous embodiment, which is to facilitate taking out the sheet-shaped casting from the groove.
[0031] As a preferred implementation of the above solution, in this embodiment, a plurality of the second impregnation blocks 2-2 are repeatedly arranged between the first impregnation block 2-1 and the third impregnation block 2-3. The first impregnation block 2-1, the third impregnation block 2-3 and the plurality of second impregnation blocks 2-2 together form the aluminum liquid impregnation module 2 of this embodiment. In this embodiment, the total length of the aluminum liquid impregnation module 2 is determined according to the length of the module installation cavity 1-3. Those skilled in the art can determine it according to actual needs, and this embodiment does not make specific limitations.
[0032] As a typical implementation of the above solution, as shown in Figure 1 , in this embodiment, the overall shape of the aluminum liquid impregnation module 2 is a cuboid, and the overall shapes of the first impregnation block 2-1, the second impregnation block 2-2 and the third impregnation block 2-3 are all sheet-shaped rectangles. The module installation cavity 1-3 is a cuboid-shaped cavity with an upper opening adapted to the outer shape of the aluminum liquid impregnation module 2.
[0033] As a preferred implementation of the above solution, as shown in Figure 1As shown in the figure, in this embodiment, the structure of the graphite encapsulation housing 1 is split. The graphite encapsulation housing 1 is dissected into a first outer frame 1-1 and a second outer frame 1-2 at the module installation cavity 1-3. When the first outer frame 1-1 and the second outer frame 1-2 are assembled, a module installation cavity 1-3 without an upper bottom and a lower bottom is formed at the joint of the first outer frame 1-1 and the second outer frame 1-2. Setting the graphite encapsulation housing 1 as split in this embodiment helps to remove the aluminum liquid infiltration module 2 after casting is completed.
[0034] As a typical implementation of the above solution, on the basis of the above embodiment, a base can also be set in this embodiment. The first outer frame 1-1 and the second outer frame 1-2 are both detachably and fixedly installed on the base. A flat plate for blocking the lower opening of the module installation cavity 1-3 is provided between the bottoms of the first outer frame 1-1 and the second outer frame 1-2 and the base. The flat plate can play a role in positioning the bottom of the aluminum liquid infiltration module 2 to ensure the completion of the forming cavity structure.
[0035] Embodiment
[0036] The pressure infiltration die tooling for preparing the aluminum matrix composite material with silicon carbide in this embodiment includes a graphite encapsulation housing 1 and an aluminum liquid infiltration module 2. The graphite encapsulation housing 1 is set as described above such as Figure 1 and Figure 2The split structure shown includes a first outer frame 1-1 and a second outer frame 1-2; the first outer frame 1-1 and the second outer frame 1-2 are butted to form a graphite encapsulation housing 1, the graphite encapsulation housing 1 is fixed to the base, and a flat plate is arranged at the bottom of the graphite encapsulation housing 1; the inner dimension of the module installation cavity 1-3 of the graphite encapsulation housing 1 matches the external dimension of the aluminum liquid infiltration module 2, and the tolerance dimension meets ±0.1 mm; the aluminum liquid infiltration module 2 includes a first infiltration sub-block 2-1, a third infiltration sub-block 2-3 and several second infiltration sub-blocks 2-2. During use, the blank is loaded into the front inner cavity (i.e., the first groove 2-1-1) of the first infiltration sub-block 2-1, and at the same time, it is inserted into the leftmost end of the module installation cavity 1-3, so that the bottom of the first infiltration sub-block 2-1 abuts against the above-mentioned flat plate. At this time, the bottom surface of the first infiltration sub-block 2-1 is flush with the bottom surface of the graphite encapsulation housing 1, and the back plane of the first infiltration sub-block 2-1 is closely attached to the left side wall inside the module installation cavity 1-3; the blank is loaded into the front inner cavity (i.e., the second groove 2-2-1) of the second infiltration sub-block 2-2, and at the same time, the second infiltration sub-block 2-2 is inserted into the module installation cavity 1- and is located on the right side of the first infiltration sub-block 2-1, so that the bottom of the second infiltration sub-block 2-2 abuts against the above-mentioned flat plate. At this time, the bottom surface of the second infiltration sub-block 2-2 is flush with the bottom surface of the graphite encapsulation housing 1, and the back plane of the second infiltration sub-block 2-2 is closely attached to the right side surface of the first infiltration sub-block 2-1; repeat the above process, continue to load the second infiltration sub-block 2-2 and the blank, and finally load the third infiltration sub-block 2-3 to complete the installation of the entire aluminum liquid infiltration module 2 and the pre-placement of the blank. When installing the third infiltration sub-block 2-3, insert the third infiltration sub-block 2-3 into the rightmost end of the module installation cavity 1-3, so that the bottom of the third infiltration sub-block 2-3 abuts against the above-mentioned flat plate. At this time, the bottom surface of the third infiltration sub-block 2-3 is flush with the bottom surface of the graphite encapsulation housing 1, and the back plane (i.e., the right side surface) of the third infiltration sub-block 2-3 is closely attached to the right side wall inside the module installation cavity 1-3. Then casting can be carried out. When the casting is completed and the mold needs to be opened, first remove the first outer frame 1-1 and / or the second outer frame 1-2 from the base, then take out the aluminum liquid infiltration module 2, and then separate the first infiltration sub-block 2-1, the third infiltration sub-block 2-3 and several second infiltration sub-blocks 2-2 from each other, and then take out the processed sheet-like casting.
[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A pressure infiltration die tooling for preparing aluminum matrix composites with silicon carbide, characterized in that, It includes a graphite encapsulation housing (1). A module installation cavity (1-3) is provided in the graphite encapsulation housing (1). A molten aluminum infiltration module (2) is detachably arranged in the module installation cavity (1-3). A forming cavity for casting sheet-shaped castings is formed in the molten aluminum infiltration module (2). The casting port of the forming cavity extends upward to the upper surface of the molten aluminum infiltration module (2), and the side surface of the forming cavity is non-horizontal.
2. The pressure infiltration die tooling for preparing the aluminum matrix composite material with silicon carbide according to claim 1, wherein, A plurality of the forming cavities that are parallel to each other or distributed in an array are formed in the molten aluminum infiltration module (2).
3. The pressure infiltration die tooling for preparing aluminum matrix silicon carbide material according to claim 1 or 2, characterized in that, The molten aluminum infiltration module (2) is divided into several blocks at the forming cavity. When the several blocks are assembled, the molten aluminum infiltration module (2) is formed, and the side surface of the molten aluminum infiltration module (2) can be closely attached to the inner wall of the module installation cavity (1-3).
4. The pressure infiltration die tooling for preparing the silicon carbide aluminum matrix material according to claim 3, characterized in that, The several blocks include a first infiltration block (2-1), a second infiltration block (2-2), and a third infiltration block (2-3). A first groove (2-1-1) is formed on one side surface of the first infiltration block (2-1). The upper end of the first groove (2-1-1) extends to the upper end surface of the first infiltration block (2-1). One side surface of the second infiltration block (2-2) can be closely attached to the side surface of the first infiltration block (2-1) and seal the side surface of the first groove (2-1-1) to form a first forming cavity (2-4) for casting sheet-shaped castings. A second groove (2-2-1) is formed on the other side surface of the second infiltration block (2-2). The upper end of the second groove (2-2-1) extends to the upper end surface of the second infiltration block (2-2). One side surface of the third infiltration block (2-3) can be closely attached to the side surface of the second infiltration block (2-2) and seal the side surface of the second groove (2-2-1) to form a second forming cavity (2-5) for casting sheet-shaped castings.
5. The pressure infiltration die tooling for preparing the aluminum matrix material with silicon carbide according to claim 4, characterized in that, A third groove (2-2-2) is formed on the side surface of the second infiltration block (2-2) facing the first infiltration block (2-1). The third groove (2-2-2) and the first groove (2-1-1) together form the first forming cavity (2-4).
6. The pressure infiltration die tooling for preparing the aluminum matrix material with silicon carbide according to claim 4, characterized in that, A fourth groove (2-3-1) is formed on the side surface of the third infiltration block (2-3) facing the second infiltration block (2-2). The fourth groove (2-3-1) and the second groove (2-2-1) together form the second forming cavity (2-5).
7. A pressure infiltration die tooling for preparing a silicon carbide aluminum matrix material according to any one of claims 4-6, characterized in that, A plurality of the second infiltration blocks (2-2) are repeatedly arranged between the first infiltration block (2-1) and the third infiltration block (2-3).
8. The pressure infiltration die tooling for preparing the aluminum matrix material with silicon carbide according to claim 4, characterized in that The overall shape of the molten aluminum infiltration module (2) is a cuboid. The overall shapes of the first infiltration block (2-1), the second infiltration block (2-2), and the third infiltration block (2-3) are all sheet-shaped rectangles. The module installation cavity (1-3) is a cuboid-shaped cavity with an upper opening that is adapted to the outer shape of the molten aluminum infiltration module (2).
9. The pressure infiltration die tooling for preparing the aluminum matrix silicon carbide material according to claim 1, characterized in that, The structure of the graphite encapsulation housing (1) is split. The graphite encapsulation housing (1) is dissected into a first outer frame (1-1) and a second outer frame (1-2) from the module installation cavity (1-3). When the first outer frame (1-1) and the second outer frame (1-2) are assembled, a module installation cavity (1-3) without upper and lower bottoms is formed at the joint of the first outer frame (1-1) and the second outer frame (1-2).
10. The pressure infiltration die tooling for preparing the aluminum matrix material with silicon carbide according to claim 9, wherein, It further includes a base. The first outer frame (1-1) and the second outer frame (1-2) are both detachably and fixedly installed on the base, and a flat plate for blocking the lower opening of the module installation cavity (1-3) is provided between the bottoms of the first outer frame (1-1) and the second outer frame (1-2) and the base.