CN107498038B - Multi-cavity pressureless sintering graphite die - Google Patents
Multi-cavity pressureless sintering graphite die Download PDFInfo
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- CN107498038B CN107498038B CN201710678143.1A CN201710678143A CN107498038B CN 107498038 B CN107498038 B CN 107498038B CN 201710678143 A CN201710678143 A CN 201710678143A CN 107498038 B CN107498038 B CN 107498038B
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- graphite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/24—Unitary mould structures with a plurality of moulding spaces, e.g. moulds divided into multiple moulding spaces by integratable partitions, mould part structures providing a number of moulding spaces in mutual co-operation
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Carbon And Carbon Compounds (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a multi-cavity pressureless sintering graphite die which comprises a graphite sleeve, an upper graphite punch, a lower graphite punch and a prepressing pressure head, wherein the graphite sleeve is a multi-cavity hollow cylinder, a radial temperature measuring hole is formed in the outer wall of the graphite sleeve, the upper graphite punch and the lower graphite punch are a whole formed by connecting a cylindrical flange plate and a cone frustum-shaped protruding rod, and the prepressing pressure head is a whole formed by connecting the cylindrical flange plate and the cylindrical protruding rod. The invention can sinter a large amount of samples at one time, improve the production efficiency, save energy and meet the requirement of high-flux material preparation. The invention can realize complete differentiation of large batches of samples obtained at one time, obtain samples at different temperatures at one time and conveniently carry out various characterizations and physical property tests.
Description
Technical Field
The invention relates to the field of pressureless sintering equipment, in particular to a graphite mould for pressureless sintering of discharge plasma.
background
The Spark Plasma Sintering (SPS) is a novel rapid Sintering method using on-off dc pulse current to directly perform power-on Sintering, and has the advantages of uniform heating, rapid temperature rise, short Sintering time, low temperature, high production efficiency, fine and uniform product tissue, and the like, and can maintain the natural state of raw materials, obtain high-density materials, and sinter gradient materials and complex workpieces.
High-throughput synthesis is the leading topic of material science, the core of which is the development of high-throughput and high-efficiency material synthesis methods, process technologies and equipment, and the exploration of high-throughput synthesis is a great challenge and opportunity in the field of material science.
At present, sintering is mostly carried out by using a discharge plasma technology under pressure. The existing die used for pressureless sintering comprises a hollow cylindrical sleeve 1 and two graphite punches 2 (an upper graphite heavy head 21 and a lower graphite punch 22), and temperature measuring holes 4 and 8 arranged on the side walls of the dies are used for materials to be sintered. As shown in fig. 1. The existing sintering mold can not realize synthesis and sintering of samples in large batch at one time, has low yield, wastes energy, can not obtain various sintered samples at one time, and is particularly important for realizing high-flux pressureless sintering.
Disclosure of Invention
The invention provides a multi-cavity pressureless sintering graphite mold, which can meet the requirement of high-flux material preparation and also provides a new idea of sintered material characterization and performance test.
In order to achieve the technical purpose, the invention provides a multi-cavity pressureless sintering graphite die which comprises a graphite sleeve, an upper graphite punch, a lower graphite punch and a prepressing pressure head, wherein a radial temperature measuring hole is formed in the outer wall of the graphite sleeve; the upper graphite punch and the lower graphite punch are of the same structure, and are oppositely arranged and respectively arranged at the upper end and the lower end of the graphite sleeve, so that the cylindrical protruding rod is positioned in the cavity of the graphite sleeve to encapsulate the material layer between the cavities; the pre-compaction pressure head is a whole that connects into by cylinder ring flange and the protruding pole of cylinder that sets up on the cylinder ring flange, and the height and the sleeve height of the protruding pole of cylinder are the same, wherein:
The graphite sleeve is a hollow cylinder with multiple cavities;
The upper graphite punch and the lower graphite punch are both composed of a cylindrical flange and a plurality of truncated cone-shaped protruding rods arranged on the cylindrical flange, and the diameter of the section of the connecting side of each truncated cone-shaped protruding rod and the flange is smaller than the diameter of the side far away from the flange; the circular truncated cone-shaped protruding rods are arranged on the surface of the cylindrical flange plate in a central symmetry mode or an irregular mode, grooves are formed in the surface of the cylindrical flange plate, the grooves are broken at the circular truncated cone-shaped protruding rods along the diameter direction of the cylindrical flange plate, more than two grooves are formed in the surface of the cylindrical flange plate with the circular truncated cone-shaped protruding rods in a central symmetry mode, and more than one groove is formed in the surface of the cylindrical flange plate with the protruding rods in an irregular mode;
The number and the positions of the conical boss rods of the upper graphite punch and the lower graphite punch and the number and the positions of the cylindrical boss rods of the pre-pressing pressure head correspond to the number and the positions of the cavities arranged in the graphite sleeve.
Preferably, for the graphite sleeve with the cavity in central symmetry, the temperature measuring hole is located at the axial midpoint of the outer wall of the graphite sleeve and is located on the same straight line with one of the cavity and the center of the sleeve; for the graphite sleeve with irregularly arranged cavities, the temperature measuring hole is positioned at the axial midpoint of the outer wall of the graphite sleeve, and is positioned on the same straight line with the cavity closest to the periphery of the sleeve and the center of the sleeve.
the cavities in the graphite sleeve can be randomly arranged, wherein preferably, when the number of the cavities arranged in the graphite sleeve is even, each cavity is centrosymmetric about the central axis of the graphite sleeve; when the number of the cavities arranged in the graphite sleeve is odd, one of the cavities is positioned in the center of the graphite sleeve, and the rest cavities are centrosymmetric about the central axis of the graphite sleeve.
preferably, the maximum diameter of the conical protruding rods of the upper graphite punch and the lower graphite punch is smaller than or equal to the inner diameter of the cavity of the graphite sleeve.
The diameters of the cylindrical flanges of the upper graphite punch and the lower graphite punch are the same as the outer diameter of the sleeve.
when the upper graphite punch and the lower graphite punch are sintered, the sum of the heights of the material layer and the conical protruding rods of the upper graphite punch and the lower graphite punch is less than or equal to the height of the sleeve.
The diameter of the cylindrical protruding rod of the pre-pressing pressure head is equal to the inner diameter of the inner cavity of the sleeve, and the diameter of the cylindrical flange of the pre-pressing pressure head is equal to the outer diameter of the sleeve.
the multi-cavity pressureless sintering graphite mould is prepared from graphite.
Has the advantages that: compared with the prior art, the invention provides the mould with various styles, and the plurality of cavities are randomly distributed and have different temperature rise speeds and final temperatures from the central position, so that the large batch of samples obtained at one time are completely differentiated, the samples at different temperatures are obtained, and various characteristics and physical property tests of different samples can be carried out at one time.
Drawings
FIG. 1 is a schematic diagram of a prior art SPS pressureless sintering mold;
FIG. 2 is a schematic diagram of one embodiment of a multi-cavity pressureless sintering mold;
FIG. 3 is a schematic view of a second embodiment of a multi-cavity pressureless sintering mold;
FIG. 4 is a schematic view of a third embodiment of a multi-cavity pressureless sintering mold;
FIG. 5 is a schematic view of one embodiment of a multi-cavity pressureless sintering die preloading device (corresponding to the graphite punch of FIG. 1);
FIG. 6 is a schematic view of a second embodiment of a pre-pressing device for a multi-cavity pressureless sintering die (corresponding to the graphite punch of FIG. 2);
FIG. 7 is a schematic view of a graphite punch;
Wherein: 1-a graphite sleeve; 2-a graphite punch; 21-installing a graphite punch; 22-lower graphite punch; 3-prepressing a pressure head; 4-temperature measuring holes; 5-cylindrical flange; 6-a truncated cone-shaped protruding rod; 7-a groove; 8-material layer; 9-cylindrical protruding rod.
Detailed Description
the invention is further described below with reference to the accompanying drawings and specific embodiments, in which the various parts are not drawn to scale for the sake of clarity.
The invention provides a multi-cavity pressureless sintering graphite die, which is prepared from graphite, and comprises a graphite sleeve 1, an upper graphite punch 21, a lower graphite punch 22 and a prepressing pressure head 3, wherein the outer wall of the graphite sleeve is provided with a radial temperature measuring hole 4, the graphite sleeve is a multi-cavity hollow cylinder, the upper graphite punch and the lower graphite punch are identical in structure, the upper graphite punch and the lower graphite punch are oppositely arranged and respectively arranged at the upper end and the lower end of the graphite sleeve, and a cylindrical protruding rod is positioned in the cavity of the graphite sleeve to encapsulate a material layer 8 between the cavities.
As shown in fig. 5 and 6, the pre-pressing ram 3 is an integral body formed by connecting a cylindrical flange 5 and a cylindrical protruding rod 9 arranged on the cylindrical flange, and the height of the cylindrical protruding rod is the same as that of the sleeve.
As shown in fig. 2 to 5, the upper graphite punch and the lower graphite punch are both composed of a cylindrical flange and a plurality of truncated cone-shaped protruding rods 6 arranged on the cylindrical flange, and the diameter of the section of the connecting side of each truncated cone-shaped protruding rod and the flange is smaller than the diameter of the side far away from the flange; the circular truncated cone-shaped protruding rods are arranged on the surface of the cylindrical flange plate in a central symmetry mode or in an irregular mode, grooves are formed in the surface of the cylindrical flange plate, the grooves are broken at the circular truncated cone-shaped protruding rods along the diameter direction of the cylindrical flange plate, more than two grooves are formed in the surface of the cylindrical flange plate with the circular truncated cone-shaped protruding rods in a central symmetry mode, and more than one groove is formed in the surface of the cylindrical flange plate with the protruding rods in an irregular mode; the number and the positions of the conical boss rods of the upper graphite punch and the lower graphite punch and the number and the positions of the cylindrical boss rods of the pre-pressing pressure head correspond to the number and the positions of the cavities arranged in the graphite sleeve.
The maximum diameter of the conical boss rods of the upper graphite punch and the lower graphite punch is smaller than or equal to the inner diameter of the cavity of the graphite sleeve. The diameters of the cylindrical flanges of the upper graphite punch and the lower graphite punch are the same as the outer diameter of the sleeve. When the upper graphite punch and the lower graphite punch are sintered, the sum of the heights of the material layer and the conical protruding rods of the upper graphite punch and the lower graphite punch is less than or equal to the height of the sleeve. The diameter of the cylindrical protruding rod of the pre-pressing pressure head is equal to the inner diameter of the inner cavity of the sleeve, and the diameter of the cylindrical flange of the pre-pressing pressure head is equal to the outer diameter of the sleeve.
Several embodiments of the present invention are specifically described below.
The graphite mold for pressureless sintering of multi-cavity in the present embodiment is exemplified by a four-hole sintering mold, as shown in fig. 2, four through-hole cavities are centrosymmetric with respect to the graphite sleeve 1, in another embodiment, the graphite mold is a five-hole sintering mold, as shown in fig. 3, one through-hole cavity is located at the center of the sleeve 1, and the other four through-hole cavities are centrosymmetric with respect to the sleeve 1, but the present invention is intended to meet the requirement of high-flux material preparation, and the multi-cavity mold is not limited to four-hole, and molds with four-hole, three-hole, four-hole, five-hole, six-hole or even more through-hole cavities are included in the scope of the present. In addition, in another embodiment, the positions of the through-hole cavities of the multi-cavity mold are randomly arranged and distributed on the graphite sleeve 1, as shown in fig. 4.
In a preferred embodiment, when an even number of cavities are provided inside the graphite sleeve, each cavity is centrosymmetric with respect to the central axis of the graphite sleeve, as shown in fig. 2; when the number of the cavities arranged in the graphite sleeve is odd, one of the cavities is located at the center of the graphite sleeve, and the other cavities are centrosymmetric with respect to the central axis of the graphite sleeve, as shown in fig. 3.
The conical boss-shaped protruding rod 6 of the graphite punch 2 in the multi-cavity die corresponds to the cavity of the graphite sleeve 1, so that the graphite die is prevented from running in the sintering process. The multi-cavity die can sinter samples in large batches at one time, so that the production efficiency is improved, and the time and energy are saved. In addition, the multi-cavity mold shown in fig. 2 and 3 can also be used for various characterizations and physical property tests. The method comprises the steps of using substances with obvious morphological feature differences at different temperatures as reference substances, placing the reference substances in a multi-cavity die shown in figure 4 for sintering, determining the specific temperature range of each cavity through the morphology, placing a sample to be tested in the multi-cavity die for sintering, obtaining the required sample at different temperatures at one time after sintering is completed, and conveniently completing various characterization and physical property tests at one time.
the working process and principle are as follows: before sintering, the conical frustum-shaped protruding rod 6 of the lower graphite punch 22 is aligned to the cavity of the graphite sleeve 1 and is arranged at the lower end of the graphite sleeve 1, materials are respectively arranged in different cavities of the graphite sleeve 1, a material layer is pre-pressed through the pre-pressing pressure head 3, the height of the pre-pressed material layer and the sum of the two protruding rods 6 is smaller than or equal to the height of the graphite sleeve, and the conical frustum-shaped protruding rod 6 of the upper graphite punch 21 is aligned to the cavity of the graphite sleeve 1 and is arranged at the upper end of the graphite sleeve 1. When the graphite punching head is assembled for the first time, the height of the conical protruding rod 6 of the upper graphite punching head and the height of the material layer are higher than that of the sleeve 1. The prepressing pressure head 3 can prepress the sample of each cavity simultaneously, so that the materials of each cavity are prepressed to the same height, and the sintering error is reduced. And then, putting the assembled die into an SPS sintering furnace, and adjusting sintering parameters. And (3) after the sintering is finished and the temperature is reduced, demoulding is carried out, and the sample of the mould is easy to demould due to the conical protruding rod 6 of the graphite punch 2 and the existence of the groove 7 on the flange 5.
Samples of each cavity in the multi-cavity pressureless sintering die shown in figure 2 are taken, and a large number of samples can be obtained at one time.
For the multi-cavity pressureless sintering mold shown in fig. 3 and 4, a certain amount of reference substances with obvious morphological characteristics at different temperatures are firstly taken and placed in the multi-cavity pressureless sintering mold, sintering is carried out under fixed sintering parameters, the sintering reference substances of each cavity are taken out after cooling and cooling are finished, and the temperature range of each cavity is determined according to the morphological characteristics. And placing the sample to be tested in the multi-cavity pressureless sintering mold, sintering under the same sintering parameters, cooling after sintering, and taking out to obtain sintered samples at different temperatures, thereby facilitating one-time characterization and performance test.
it should be noted that the above examples are only for clearly illustrating the present invention, and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. All such possible equivalents and modifications are deemed to fall within the scope of the invention as defined in the claims.
Claims (1)
1. A multi-cavity pressureless sintering graphite die comprises a graphite sleeve, an upper graphite punch, a lower graphite punch and a prepressing pressure head, wherein a radial temperature measuring hole is formed in the outer wall of the graphite sleeve; the upper graphite punch and the lower graphite punch are of the same structure, and are oppositely arranged and respectively arranged at the upper end and the lower end of the graphite sleeve, so that the cylindrical protruding rod is positioned in the cavity of the graphite sleeve to encapsulate the material layer between the cavities; the pre-pressing pressure head is a whole formed by connecting a cylindrical flange plate and a cylindrical protruding rod arranged on the cylindrical flange plate, the height of the cylindrical protruding rod is the same as that of the sleeve, and the pre-pressing pressure head is characterized in that,
The graphite sleeve is a hollow cylinder with multiple cavities;
The upper graphite punch and the lower graphite punch are both composed of a cylindrical flange and a plurality of truncated cone-shaped protruding rods arranged on the cylindrical flange, and the diameter of the section of the connecting side of each truncated cone-shaped protruding rod and the flange is smaller than the diameter of the side far away from the flange; the circular truncated cone-shaped protruding rods are arranged on the surface of the cylindrical flange plate in a central symmetry mode or an irregular mode, grooves are formed in the surface of the cylindrical flange plate, the grooves are broken at the circular truncated cone-shaped protruding rods along the diameter direction of the cylindrical flange plate, more than two grooves are formed in the surface of the cylindrical flange plate with the circular truncated cone-shaped protruding rods in a central symmetry mode, and more than one groove is formed in the surface of the cylindrical flange plate with the protruding rods in an irregular mode;
The number and the positions of the conical boss rods of the upper graphite punch and the lower graphite punch and the number and the positions of the cylindrical boss rods of the pre-pressing pressure head correspond to the number and the positions of the cavities arranged in the graphite sleeve; for the graphite sleeve with the cavity in central symmetry, the temperature measuring hole is positioned at the axial middle point of the outer wall of the graphite sleeve and is positioned on the same straight line with one cavity and the center of the sleeve; for the graphite sleeve with the irregularly arranged cavity, the temperature measuring hole is positioned at the axial middle point of the outer wall of the graphite sleeve, and is positioned on the same straight line with the cavity closest to the periphery of the sleeve and the center of the sleeve; when the number of the cavities arranged in the graphite sleeve is even, each cavity is centrosymmetric about the central axis of the graphite sleeve; when the number of the cavities arranged in the graphite sleeve is odd, one cavity is positioned in the center of the graphite sleeve, and the other cavities are centrosymmetric about the central axis of the graphite sleeve; the maximum diameter of the conical protruding rods of the upper graphite punch and the lower graphite punch is less than or equal to the inner diameter of the cavity of the graphite sleeve; the diameters of the cylindrical flange plates of the upper graphite punch head and the lower graphite punch head are the same as the outer diameter of the sleeve; when the upper graphite punch and the lower graphite punch are sintered, the sum of the heights of the material layer and the conical protruding rods of the upper graphite punch and the lower graphite punch is less than or equal to the height of the sleeve; the diameter of a cylindrical protruding rod of the pre-pressing pressure head is equal to the inner diameter of the inner cavity of the sleeve, and the diameter of a cylindrical flange of the pre-pressing pressure head is equal to the outer diameter of the sleeve; the multi-cavity pressureless sintering graphite mould is prepared from graphite.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710678143.1A CN107498038B (en) | 2017-08-09 | 2017-08-09 | Multi-cavity pressureless sintering graphite die |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710678143.1A CN107498038B (en) | 2017-08-09 | 2017-08-09 | Multi-cavity pressureless sintering graphite die |
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| CN107498038A CN107498038A (en) | 2017-12-22 |
| CN107498038B true CN107498038B (en) | 2019-12-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274471A (en) * | 2018-03-16 | 2019-09-24 | 中国科学院物理研究所 | Probe-type high throughput discharging plasma sintering equipment |
| CN109465449B (en) * | 2019-01-07 | 2020-06-09 | 哈尔滨工业大学 | Beneficial friction rapid sintering forming method for hard alloy cutter with large height-diameter ratio |
| CN111825431B (en) * | 2020-05-20 | 2023-02-07 | 中国工程物理研究院材料研究所 | High-flux integrated preparation method of composite material |
| CN112589095A (en) * | 2020-12-11 | 2021-04-02 | 西安交通大学 | High-flux preparation method of gravity-infiltrated iron-based composite material preform |
| CN112548078A (en) * | 2020-12-11 | 2021-03-26 | 西安交通大学 | High-flux preparation method of gravity-impregnated composite bucket tooth |
| CN113154882B (en) * | 2021-04-27 | 2023-08-29 | 华南师范大学 | Pressureless rapid sintering device and sintering method for 3D printing |
| CN114871431B (en) * | 2022-05-10 | 2024-03-29 | 哈尔滨工业大学 | High-flux bar preparation device and application method thereof |
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| JP2003251499A (en) * | 2002-02-27 | 2003-09-09 | Kobe Steel Ltd | Lubricant in die for green compacting and green compacting method |
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