CN216065533U - Tungsten or molybdenum crucible isostatic compaction mould - Google Patents
Tungsten or molybdenum crucible isostatic compaction mould Download PDFInfo
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- CN216065533U CN216065533U CN202121992189.9U CN202121992189U CN216065533U CN 216065533 U CN216065533 U CN 216065533U CN 202121992189 U CN202121992189 U CN 202121992189U CN 216065533 U CN216065533 U CN 216065533U
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Abstract
The utility model discloses a tungsten or molybdenum crucible isostatic compaction die, which comprises a core rod, an outer rubber sleeve, an upper rubber sleeve, a sealing ring and an outer steel sleeve; the upper rubber sleeve is an elastic cylinder with a bottom; the core rod consists of an upper rigid part and a lower rigid part which are integrally connected, the shape of the upper part is matched with that of the inner wall of the crucible, and the lower part is a rigid cylinder; the outer rubber sleeve is a hollow elastic body, the lower part of the outer rubber sleeve is elastically sleeved on the peripheral surface of the rigid cylinder at the lower part of the core rod, and the upper part of the outer rubber sleeve is elastically sleeved on the peripheral surface of the cylinder; the rigid sealing ring is embedded in the cylinder cavity of the upper rubber sleeve; the hollow outer rigid sleeve is sleeved outside the outer rubber sleeve, and the surface of the outer rigid sleeve is provided with a plurality of round holes; a working cavity is formed among the core rod, the upper rubber sleeve and the outer rubber sleeve. The utility model has the advantages of simple structure, convenient assembly and disassembly, reliable sealing, low mould manufacturing cost, repeated use, strong practicability and one-time qualified rate of pressing, thereby reducing the production cost and improving the production efficiency.
Description
Technical Field
The utility model relates to the field of powder metallurgy compression molding, in particular to a crucible isostatic pressing mold.
Background
Tungsten and molybdenum have the characteristics of high melting point, high density, good high-temperature strength, high thermal conductivity, small thermal expansion coefficient, strong wear resistance and corrosion resistance and the like, so that the tungsten and molybdenum crucible prepared by taking pure tungsten and pure molybdenum as raw materials is widely applied to industries such as rare earth smelting, quartz glass preparation, crystal growth of ruby and sapphire, electronic spraying and the like, and plays an important role in modern industry.
Tungsten and molybdenum crucibles are mostly produced by a powder metallurgy method, wherein a pressing process is particularly critical. At present, the tungsten crucible and the molybdenum crucible are pressed by isostatic pressing. A pressing mold of prior art 1 is shown in fig. 1, and comprises a core mold 1, a rubber outer mold 2 and an upper end cover 3, wherein the rubber outer mold 2 is sleeved on the core mold 1 and tightly bundled and sealed, then tungsten powder is added, then the upper end cover 3 is used for plugging the top opening of the rubber outer mold, the rubber outer mold 2 and the upper end cover 3 are tightly bundled and sealed, and then the whole mold is placed in an isostatic press for pressing. Prior art 2 is like chinese utility model patent CN201620180550.0 "a tungsten molybdenum crucible forming special mold", which is to install the first core block and the second core block together during the pressing process, then install a seal ring on the excircle of the lower end of the first core block, then install a rubber cylinder outside the seal ring, and cover the second seal ring on the outer wall of the rubber cylinder, form a forming cavity between the outer wall of the steel core and the inner wall of the rubber cylinder, and then charge. After the charging is finished, the rubber end cover is covered, the fixed sleeve is sleeved on the outer wall of the second sealing ring, and the second sealing ring is fastened and sealed by using screws.
The defects shared by the prior art 1 and the prior art 2 comprise:
1. the rubber outer mold (namely the rubber cylinder in the prior art 2) is made of soft materials, when a semi-finished product is molded and charged, powder enters the mold cavity, the bottom of the powder is often more compact under the action of the self gravity when the powder vibrates, and the bottom powder often bulges outwards because the rubber outer mold is softer and is easy to deform, so that the size of the mold cavity during charging is ensured without any measures, the deformation is easy to occur during charging, and the charging of all parts is uneven. Because the inhomogeneous of feeding, crucible pressed compact outer wall often is unsmooth, and pressed compact wall thickness also presents inhomogeneous phenomenon, and follow-up one lathe work procedure that has to increase reduces the efficiency of crucible production, and the cost increases.
2. Secondly, the upper end cap in prior art 1 (i.e. the rubber end cap in prior art 2) has a certain rigidity, and its shrinkage capability is weaker than that of the rubber sleeve, and it is difficult to deform during pressing, so that the transmission of pressure is affected, and the obtained tungsten and molybdenum crucible green compact forms a "bell mouth" near the upper end cap of the die, as shown in fig. 1.
3. The upper end cover has certain rigidity and thickness and blocks the transmission of pressure, so that the pressure acting on the upper end cover generates large loss when being transmitted to a pressed compact, the strength of the pressed compact at the bottom of the crucible is often low, and cracking or microcracks are easy to generate;
4. the upper end cover and the rubber sleeve are sealed in an interference fit mode, so that the upper end cover has certain thickness and rigidity, otherwise, leakage is easily caused during sealing. After the sealing structure is used for a certain number of times, the size of the upper end cover can be reduced under the action of pressure, so that the interference fit effect with the rubber sleeve is weakened, and liquid leakage is caused.
5. Compared with the prior art 1, the prior art 2 is improved to a certain extent, but the patent has more parts, troublesome assembly in the pressing process and low production efficiency. Secondly, at the in-process of feeding, fixed cover only installs after the completion of feeding to because the existence of second sealing washer leads to there being certain clearance between rubber sleeve and the fixed cover, consequently also is difficult to play fine fixed action in the pressing process, and pressed compact size accuracy is difficult to guarantee. The sealing ring can cause the mouth of the crucible pressed compact to be uneven, and the defects of edge drop, corner drop and the like are easily caused.
The defects easily cause the crucible to be scrapped, and the one-time pressing yield is low.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a static pressure forming die for tungsten or molybdenum crucibles and the like, which has the advantages of simple structure, convenient assembly and disassembly, reliable sealing, low manufacturing cost, repeated use and strong practicability, solves the phenomenon of 'bell mouth' of the crucible in the isostatic pressure pressing process, simultaneously avoids the phenomenon of uneven outer wall of a pressed blank caused by uneven charging in the pressing process, effectively improves the strength of the bottom of the pressed blank of the crucible, eliminates the cracking tendency, improves the one-time pass rate of pressing, thereby reducing the production cost and improving the production efficiency.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a static pressure forming die for a tungsten or molybdenum crucible comprises a core rod, an outer rubber sleeve, an upper rubber sleeve, a sealing ring and an outer steel sleeve; the upper rubber sleeve is an elastic cylinder with a bottom; the core rod consists of an upper rigid part and a lower rigid part which are integrally connected, the shape of the upper part is matched with the shape of the inner wall of the crucible to be produced, and the lower part is a rigid cylinder; the outer rubber sleeve is a hollow elastic body, the lower part of the outer rubber sleeve is elastically sleeved on the peripheral surface of the rigid cylinder, and the upper part of the outer rubber sleeve is tightly sleeved on the peripheral surface of the elastic cylinder; the rigid sealing ring is embedded in the cylinder cavity of the upper rubber sleeve; the hollow outer rigid sleeve is sleeved outside the outer rubber sleeve, and the surface of the outer rigid sleeve is provided with a plurality of round holes; a working cavity is formed among the core rod, the upper rubber sleeve and the outer rubber sleeve, and the core rod, the upper rubber sleeve, the outer rubber sleeve and the outer rigid sleeve are concentric.
The isostatic compaction mould for the tungsten or molybdenum crucible comprises a core rod, an outer rubber sleeve, an upper rubber sleeve, a sealing ring and an outer rigid sleeve from inside to outside. And a working cavity is formed among the core rod, the upper rubber sleeve and the outer rubber sleeve and is used for filling powder, and after isostatic pressing, a semi-finished crucible green compact is formed. When powder materials are filled in the working cavity, the powder materials are prevented from deforming and bulging outwards due to the constraint action of the outer rigid sleeve when the powder materials are filled, the deformation and the dimensional accuracy of a pressed product can be effectively controlled, and the dimensional accuracy and the flatness of the outer wall of a crucible pressed compact are ensured while the concentricity and the wall thickness uniformity of the pressed crucible pressed compact are ensured; the surface of the outer rigid sleeve is provided with a plurality of round holes for the entering of liquid medium during pressing so as to facilitate the transmission of pressure. The upper part of the core rod is used for forming the inner wall of the crucible, the shape of the upper part of the core rod can be a conical round rod or a hemispherical cambered surface, the core rod is a rigid body, the deformation and the size of the inner wall of the crucible can be ensured, and the conical degree of the round rod is set so as to facilitate the removal of the core rod after compression forming. The upper rubber sleeve is an elastomer, a rigid sealing ring is arranged in a cylinder cavity of the upper rubber sleeve, so that the upper rubber sleeve can be elastically sleeved on the outer rubber sleeve, radial deformation can be kept during isostatic pressing, the sealing performance and the size precision of a product are ensured, and elastic deformation can be generated under the action of pressure so as to facilitate the pressure to be transmitted to powder at the bottom of a crucible green compact, thereby reducing the pressure loss in the pressing process, effectively improving the green compact strength at the bottom of the crucible, and eliminating the cracking phenomenon at the bottom of the crucible. The crucible green compact prepared by the die has the advantages of no cracking phenomenon at the bottom, uniform wall thickness, good concentricity, flat and smooth inner and outer walls, no need of secondary turning, and high qualification rate of primary pressing.
The further improvement is that the sealing ring and the peripheral surface of the rigid cylinder are provided with at least one groove; the sealing performance of the upper part and the lower part of the working cavity is greatly improved by using binding parts such as iron wires and binding ropes to bind and seal the outer rubber sleeve and the upper rigid sealing ring and the groove of the lower rigid cylinder.
The further improvement is that the outer periphery of the upper end surface of the rigid cylinder is chamfered, and the radius of the chamfer is 3-6 mm. So as to facilitate the shrinkage deformation of the rubber sleeve at the corresponding part in the pressing process; prevent the phenomenon of 'horn mouth' after pressing.
The further improvement is that the thickness of the upper rubber sleeve and the outer rubber sleeve is 0.8-5 mm.
The further improvement is that the wall thickness of the sealing ring is 8-20mm, the lower end face of the periphery is chamfered, and the radius of the chamfer is 2-5 mm. The sealing ring is ensured to have enough strength, the upper rubber sleeve is supported, the deformation is avoided, and the sealing effect is ensured.
The further improvement is that the wall thickness of the outer rigid sleeve is 1-15mm, and the size of the round hole is phi 5-phi 20 mm.
The inner diameter of the outer rubber sleeve is the same as the outer diameters of the rigid cylinder and the elastic cylinder, and the inner diameter of the outer rigid sleeve is the same as the outer diameter of the outer rubber sleeve; the core rod, the upper rubber sleeve, the outer rubber sleeve and the outer rigid sleeve are concentric.
The elastic rubber sleeve plays a role in sealing in the pressing process, and meanwhile, the elastic rubber sleeve is stressed to shrink so as to compact powder at the bottom of the crucible, and the elastic rubber sleeve is made of silicon rubber, chloroprene rubber, polyurethane, polyvinyl chloride and other soft elastic materials.
Compared with the prior art, the core rod, the rubber sleeve, the outer rubber sleeve and the outer steel sleeve are concentric, and the outer steel sleeve is matched with the sealed outer rubber sleeve, the sealed ring and the core rod, so that the deformation of a working cavity is avoided when powder is filled, the transmission of pressure in the pressing process is facilitated, the concentricity of the inner circle and the outer circle of the pressing crucible and the uniformity of the wall thickness are ensured, and the phenomena of cracking of the bottom of the pressing blank of the crucible and unevenness of the outer wall of the pressing blank are effectively eliminated. The obtained crucible green compact has smooth inner and outer walls, good concentricity, uniform and complete wall thickness and no edge and foot dropping phenomena of microcracks. After multiple verification, the crucible pressed blank pressed by the die has high dimensional precision, secondary finishing is not needed, the primary qualified rate of pressing is greatly improved, and the production cost is reduced; and the mould has simple structure, convenient assembly and disassembly in the production process, reliable sealing and high repeated utilization rate, and effectively improves the pressing efficiency of the crucible.
For a better understanding and practice, the utility model is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1-1 is an assembled cross-sectional view of a conventional isostatic compaction die for tungsten and molybdenum crucibles;
FIGS. 1-2 are cross-sectional views of the compact of FIG. 1 after compression molding;
FIGS. 2-1 through 2-5 are views of a mold assembly of the present invention; wherein
FIG. 2-1 is an outer steel sleeve;
FIG. 2-2 is an outer gum cover;
FIGS. 2-3 illustrate the application of a gum cover;
FIGS. 2-4 are seal rings;
FIGS. 2-5 are core rods;
FIG. 3 is an assembled sectional view showing a used state of an isostatic pressing mold according to embodiment 1 of the present invention.
FIG. 4 is an assembled sectional view showing a used state of an isostatic pressing mold in embodiment 2 of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, which are provided for illustration and explanation, and are not intended to limit the present invention.
Example 1
Referring to fig. 2-1 to fig. 2-5 and fig. 3, the isostatic compaction die for tungsten and molybdenum crucibles of the utility model comprises a core rod 6, an outer rubber sleeve 2, an upper rubber sleeve 3, a sealing ring 4 and an outer steel sleeve 1 from inside to outside. The upper rubber sleeve is an elastic cylinder with a bottom; the outer rubber sleeve is a hollow elastic body; the rigid sealing ring is embedded in the cylinder cavity of the upper rubber sleeve; the hollow outer rigid sleeve is sleeved outside the outer rubber sleeve, and the surface of the outer rigid sleeve is provided with a plurality of round holes; a working cavity is formed among the core rod, the upper rubber sleeve and the outer rubber sleeve.
The core rod 6 is a rigid member including an upper portion and a lower portion integrally connected. The preferred material is 45# steel solid parts and is subjected to thermal refining. The upper part is a rigid round bar with taper, the difference of the outer diameters of the upper end and the lower end is 0.5-3mm, and the surface roughness Ra is less than or equal to 0.8 mu m; the lower part of the rigid cylinder is provided with 1-2 grooves 7 on the peripheral surface of the rigid cylinder, and the peripheral surface of the upper end surface is chamfered, and the radius of the chamfer is 3-6 mm.
The outer rubber sleeve 2 shrinks in the isostatic pressing process to compact powder, and the material of the outer rubber sleeve is usually silicon rubber, chloroprene rubber, polyurethane, polyvinyl chloride and other soft elastic materials. The inner diameter of the outer rubber sleeve 2 is the same as the outer diameters of the rigid cylinder and the upper rubber sleeve 3, and the thickness is 0.8-5 mm.
The upper rubber sleeve 3 plays a role in sealing in the pressing process, and shrinks to compact powder at the bottom of the crucible, and the material of the upper rubber sleeve is generally silicon rubber, chloroprene rubber, polyurethane, polyvinyl chloride and other soft elastic materials. The outer diameter of the upper rubber sleeve 3 is the same as the inner diameter of the outer rubber sleeve 2, and the thickness of the upper rubber sleeve is the same as that of the outer rubber sleeve 2.
The sealing ring 4 is a steel circular ring part, the wall thickness of the circular ring is 8-20mm, 1-2 grooves are formed in the outer wall of the circular ring, the sealing ring is placed in the upper rubber sleeve 3 when in use, and the grooves in the outer wall of the sealing ring are used for bundling and sealing with the upper rubber sleeve 3 and the outer rubber sleeve 2. And chamfering the lower end face of the periphery of the sealing ring 4, wherein the radius of the chamfer is 2-5 mm.
The outer rigid sleeve 1 is a circular tubular steel part or a hard PVC pipe, is sleeved outside the outer rubber sleeve, has the wall thickness of 1-15mm, and has the same inner diameter size as the outer diameter of the outer rubber sleeve. The periphery of the outer rigid sleeve 1 is provided with a plurality of round holes for the entry of liquid medium during isostatic pressing, and the size of the round holes is phi 5-phi 20 mm.
When the plug is used, firstly, the outer rubber sleeve 2 is sleeved on the outer peripheral surface of the rigid cylinder at the lower part of the core rod 6, the outer rubber sleeve 2 and the core rod 6 are bundled together by adopting an iron wire or a nylon rope for sealing, and the bundling position is a position where the outer peripheral surface of the rigid cylinder is provided with a groove. After the sealing is finished, the outer rigid sleeve 1 is sleeved outside the bundled and sealed outer rubber sleeve 2 and the core rod 6, so that the lower end of the core rod 6, the outer rubber sleeve 2 and the outer rigid sleeve 1 are kept concentric.
And secondly, filling powder to be pressed into a die cavity 5 formed by the core rod 6 and the outer rubber sleeve 2, starting a vibration platform to tamp the powder, simultaneously, filling the powder and tamping the powder uniformly, and ensuring that the concentricity of the outer rigid sleeve 1, the core rod 6 and the outer rubber sleeve 2 is not changed.
And thirdly, after powder is filled, filling the upper rubber sleeve 3 into the outer rubber sleeve 2, so that the inner cylindrical surface of the outer rubber sleeve 2 is matched with the outer cylindrical surface of the upper rubber sleeve 3, and the bottom of the upper rubber sleeve 3 is contacted with the filled powder.
And fourthly, embedding the sealing ring 4 in the cylindrical cavity of the upper rubber sleeve 3, attaching the outer cylindrical surface of the sealing ring 4 to the inner cylindrical surface of the cylindrical cavity of the upper rubber sleeve 3, bundling the outer rubber sleeve 2, the upper rubber sleeve 3 and the sealing ring 4 together by adopting an iron wire or a nylon rope for sealing, and arranging a groove on the outer cylindrical surface of the sealing ring 4 at the bundling position.
And fifthly, putting the whole filled and sealed pressed blank mold into an isostatic press for pressing. The pressing pressure and the corresponding process parameters are adjusted according to the powder condition. And after the pressing is finished, the sealing ring 4, the upper rubber sleeve 3, the outer rigid sleeve 1 and the outer rubber sleeve 2 are sequentially removed, and the pressed crucible green compact is upwards taken out.
According to the static pressure forming die for the tungsten and molybdenum crucibles and the like, the forming part at the upper end of the core rod 6 is provided with a certain taper, so that a pressed blank can be conveniently taken out after pressing is finished. The core rod 6 is respectively matched with the outer rubber sleeve 2 and the outer rigid sleeve 1, so that the concentricity and the wall thickness uniformity of the pressed crucible green compact are ensured, and the dimensional accuracy and the flatness of the outer wall of the crucible green compact are ensured; the edge part of the lower end of the core rod 6 is chamfered, so that the contraction deformation of the outer rubber sleeve 2 is prevented from being hindered in the isostatic pressing process, and the deformation of powder at the corresponding part is facilitated; when powder is filled, the deformation of the outer rubber sleeve 2 is controlled due to the constraint action of the outer rigid sleeve 1, and the pressed deformation and the outer diameter size are ensured; after the mold is filled, the upper rubber sleeve 3 and the sealing ring 4 are matched with the outer rubber sleeve 2 for bundling and sealing, and the elastic soft upper rubber sleeve 3 is easy to deform under the action of pressure, so that the pressure loss in the pressing process is reduced, the pressure is convenient to transfer to powder at the bottom of a crucible pressed blank, the strength of the pressed blank at the bottom of the crucible is effectively improved, and the cracking tendency of the bottom of the crucible is eliminated.
Example 2
Referring to fig. 4, the die of the embodiment comprises a mandrel 6, an outer rubber sleeve 2, an upper rubber sleeve 3, a sealing ring 4 and an outer steel sleeve 1, wherein the outer peripheral surface of the sealing ring and the outer peripheral surface of a cylinder at the lower part of the mandrel are provided with grooves 7. Different from the embodiment 1, the upper part of the core rod is a hemispherical cambered surface, and can be designed into a bowl-shaped cambered surface according to requirements. The lower part of the outer rubber sleeve is a hemispherical cambered surface or a circular arc surface like a bowl, and the shape of the outer rigid sleeve is matched with that of the outer rubber sleeve. The inner wall and the outer wall of a die cavity 5 formed by the lower parts of the core rod and the outer rubber sleeve are hemispherical cambered surfaces or bowl-shaped cambered surfaces.
In the pressing process of the die, the pressure loss is less, and the green compact strength is high; the crucible pressed by the mold has smooth and flat inner and outer walls, uniform wall thickness, good concentricity and no defects of cracks, edge drop, corner drop and the like. After multiple verification, the crucible pressed blank pressed by the die of the utility model does not need to be subjected to secondary finishing, thereby greatly improving the primary qualified rate of pressing; the mould has the advantages of simple structure, low manufacturing cost, convenient assembly and disassembly in the production process, reliable sealing, repeated use for many times, effective improvement of the pressing efficiency of the crucible, and particularly effective elimination of the cracking phenomenon of the bottom of a crucible pressed compact for pressing large-size and thin-wall cylindrical crucibles.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (10)
1. A static pressure forming die for a tungsten or molybdenum crucible and the like is characterized by comprising a core rod, an outer rubber sleeve, an upper rubber sleeve, a sealing ring and an outer steel sleeve; the upper rubber sleeve is an elastic cylinder with a bottom; the core rod consists of an upper rigid part and a lower rigid part which are integrally connected, the shape of the upper part is matched with that of the inner wall of the crucible, and the lower part is a cylinder; the outer rubber sleeve is a hollow elastic body, the lower part of the outer rubber sleeve is elastically sleeved on the peripheral surface of the cylinder, and the upper part of the outer rubber sleeve is elastically sleeved on the peripheral surface of the cylinder; the rigid sealing ring is embedded in the cylinder cavity of the upper rubber sleeve; the hollow outer rigid sleeve is sleeved outside the outer rubber sleeve, and the surface of the outer rigid sleeve is provided with a plurality of round holes; a working cavity is formed among the core rod, the upper rubber sleeve and the outer rubber sleeve.
2. An isostatic pressing molding die as claimed in claim 1, wherein the sealing ring and the outer circumferential surface of the cylinder are provided with at least one groove.
3. The isostatic pressing molding die as claimed in claim 1, wherein the upper end surface of the cylinder is chamfered at an outer periphery thereof, and a radius of the chamfer is 3-6 mm.
4. An isostatic pressing mold as claimed in claim 1, wherein the upper part of the core rod is a tapered rigid round rod, and the surface roughness is no more than ra0.8 μm.
5. The isostatic pressing molding die as claimed in claim 1, wherein the upper portion of the core rod is a hemispherical arc surface or a circular arc surface, and the surface roughness is not more than ra0.8 μm.
6. The isostatic pressing molding die as claimed in claim 1, wherein the thickness of the upper rubber sleeve and the outer rubber sleeve is 0.8-5 mm; the wall thickness of the outer rigid sleeve is 1-15mm, and the size of the circular hole is phi 5-phi 20 mm.
7. The isostatic pressing molding die as claimed in claim 1, wherein the wall thickness of the sealing ring is 8-20mm, the lower end surface of the periphery is chamfered, and the chamfer radius is 2-5 mm.
8. An isostatic pressing molding die as claimed in claim 5, wherein the lower portion of the outer rubber sleeve is a hemispherical arc surface or an arc surface, and the shape of the outer rigid sleeve is matched with the shape of the outer rubber sleeve.
9. An isostatic pressing molding die as claimed in claim 4, wherein the inner diameter of the outer rubber sleeve is the same as the outer diameter of the cylinder and the cylinder, and the inner diameter of the outer rigid sleeve is the same as the outer diameter of the outer rubber sleeve; the core rod, the upper rubber sleeve, the outer rubber sleeve and the outer rigid sleeve are concentric.
10. An isostatic pressing molding die as claimed in claim 1, wherein the outer rubber sleeve is provided with a bundling part corresponding to the grooves of the sealing ring and the cylinder.
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| CN202121992189.9U CN216065533U (en) | 2021-08-24 | 2021-08-24 | Tungsten or molybdenum crucible isostatic compaction mould |
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| CN202121992189.9U CN216065533U (en) | 2021-08-24 | 2021-08-24 | Tungsten or molybdenum crucible isostatic compaction mould |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116003108A (en) * | 2022-11-22 | 2023-04-25 | 中国科学院金属研究所 | Preparation method of forming crucible with desulfurization and rare earth element addition functions |
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2021
- 2021-08-24 CN CN202121992189.9U patent/CN216065533U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116003108A (en) * | 2022-11-22 | 2023-04-25 | 中国科学院金属研究所 | Preparation method of forming crucible with desulfurization and rare earth element addition functions |
| CN116003108B (en) * | 2022-11-22 | 2024-03-22 | 中国科学院金属研究所 | Preparation method of forming crucible with desulfurization and rare earth element addition functions |
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