CN115740448A - Cold isostatic pressing preparation method of metal bar - Google Patents
Cold isostatic pressing preparation method of metal bar Download PDFInfo
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- CN115740448A CN115740448A CN202211540549.0A CN202211540549A CN115740448A CN 115740448 A CN115740448 A CN 115740448A CN 202211540549 A CN202211540549 A CN 202211540549A CN 115740448 A CN115740448 A CN 115740448A
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- sheath
- adhesive tape
- wrapping
- cold isostatic
- isostatic pressing
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 87
- 239000002184 metal Substances 0.000 title claims abstract description 87
- 238000009694 cold isostatic pressing Methods 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 79
- 239000002390 adhesive tape Substances 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 38
- 239000002985 plastic film Substances 0.000 claims abstract description 31
- 229920006255 plastic film Polymers 0.000 claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000011049 filling Methods 0.000 claims abstract description 4
- 229920001971 elastomer Polymers 0.000 claims description 24
- 239000005060 rubber Substances 0.000 claims description 24
- 239000003755 preservative agent Substances 0.000 claims description 23
- 230000002335 preservative effect Effects 0.000 claims description 23
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 13
- 229910052715 tantalum Inorganic materials 0.000 claims description 12
- 229910001362 Ta alloys Inorganic materials 0.000 claims description 9
- 239000004816 latex Substances 0.000 claims description 9
- 229920000126 latex Polymers 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 229920002635 polyurethane Polymers 0.000 claims description 8
- 239000004814 polyurethane Substances 0.000 claims description 8
- 229910001257 Nb alloy Inorganic materials 0.000 claims description 7
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 239000010955 niobium Substances 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 7
- -1 polyethylene Polymers 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 239000004800 polyvinyl chloride Substances 0.000 claims description 6
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 10
- 238000000926 separation method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000004663 powder metallurgy Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
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- 150000001875 compounds Chemical class 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000012945 sealing adhesive Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 239000013077 target material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
The invention provides a cold isostatic pressing preparation method of a metal bar, which comprises the following steps: filling metal powder into a sheath, compacting, then plugging a sealing plug into the sheath, and wrapping the joint of the sealing plug and the sheath by using an adhesive tape; then, sequentially wrapping the bag by using a plastic film and an adhesive tape, and then hooping the wrapped position by using a fastener to complete the sheathing and sealing; carrying out cold isostatic pressing treatment on the sealed sheath; and then opening the fastener, cutting off the adhesive tape and the plastic film, taking out the sealing plug, and then performing demoulding treatment to obtain the metal bar. According to the method, in the cold isostatic pressing process of the metal powder, the sheath is wrapped and sealed according to the sequence of the adhesive tape, the plastic film and the adhesive tape and is fixed by the fastener, so that the sealing effect is good, the operation is simple and convenient, the separation operation of the sheath and a product is simplified by carrying out cold isostatic pressing and rapidly carrying out demoulding and separation, and the obtained metal bar is high in density and strength; the method is simple and convenient to operate, and can effectively improve the production efficiency and reduce the cost.
Description
Technical Field
The invention belongs to the technical field of semiconductor targets, and relates to a cold isostatic pressing preparation method of a metal bar.
Background
The integrated circuit is a miniature electronic device, which is prepared by connecting elements such as a transistor, a resistor, a capacitor, an inductor and the like with wiring by a certain process and is concentrated on a silicon chip to realize a specific function. With the development of finer feature size and wiring width of integrated circuits, copper wiring is gradually used to replace aluminum wiring, but due to its active property, copper wiring is easy to diffuse with circuit substrate silicon to form copper-silicon alloy during use, which also affects circuit performance, so it is important to plate an inert corrosion-resistant film on the metal interconnection of integrated circuits.
Metal tantalum and its compounds have the advantages of hard texture, high ductility, high conductivity, thermal stability, corrosion resistance and the like, do not form alloy or compound with copper and silicon, can be used as a barrier layer for preventing copper diffusion, and are widely applied to the industrial fields of chemical industry, microelectronics, electrical industry and the like, and tantalum target materials gradually become one of the key raw materials of the semiconductor industry. Generally, the sputtering tantalum target mainly comprises two main processes of melting and plastic processing, wherein the melting mode is divided into vacuum arc melting and vacuum electron beam melting, and the latter method is mainly adopted at present, firstly high-purity tantalum ingots are obtained through vacuum electron beam melting, and then the tantalum ingots are subjected to plastic deformation repeatedly, so that the tantalum target with a specific size is obtained.
The metal bar is usually used for smelting in an electron beam furnace, and the forming of the metal bar usually needs to be carried out through cold isostatic pressing and sintering processes, wherein the cold isostatic pressing is one of the most main forming means of powder metallurgy, a sheath is usually required to be selected as a die, the selected sheath material and structure have direct influence on the formability of a pressed compact and the product quality, and meanwhile, the cold isostatic pressing sheath also has certain technical requirements on use, particularly the sealing operation of the sheath. CN 204321190U discloses a powder metallurgy jacket for cold isostatic pressing, which is a bag-shaped jacket with an opening at one end, a sealing plug is arranged at the opening end of the jacket, and a transition pad plate is arranged between the sealing plug and a material; a transition base plate is placed above the materials, then a rubber sealing plug is arranged, and finally the materials are packed and sealed by using iron wires after being pre-vacuumized. However, in the sealing operation of iron wire binding, the technical experience of operators is important, the tightness degree of iron wire binding, the number of screw threads, the positions of falling threads and the like are all key factors influencing the finished product rate of pressed blanks, the operation is complex, and the production efficiency is influenced.
CN 103920880A discloses a method for preparing tantalum and tantalum alloy bars, which comprises the following steps: loading the prepared tantalum or tantalum alloy powder into a cylindrical rubber sheath, kneading, molding, sealing, placing in a cold isostatic press, pressurizing, maintaining pressure, relieving pressure to complete cold isostatic press molding, and demolding to obtain a tantalum rod green compact; the method mainly comprises the steps of binding the rubber plug part tightly by using an iron wire to be used as a blank strip after the rubber plug is plugged and air in the rubber sleeve is discharged, clamping the blank strip by using a clamping plate after the blank strip is uniformly kneaded, and fixing the blank strip by using a rubber band.
CN 206292112U discloses a rock conventional triaxial test sample loading device, which comprises rubber sleeves, a latex sleeve, an adhesive tape and a local annular strain gauge, wherein a first protective adhesive tape is wound in the middle of a cylindrical rock sample, the rubber sleeves are respectively arranged at two ends of the rock sample, a gap between the two rubber sleeves is used as a groove of the rock sample, and a joint between the groove and the rubber sleeves is sealed by using a first sealing adhesive tape; the groove is provided with a latex sleeve, two ends of the latex sleeve are respectively sleeved on the two rubber sleeves, the opening is sealed through a second sealing adhesive tape, a second protective adhesive tape is further arranged on the outer side of the latex sleeve, and the local annular strain gauge is installed on the second protective adhesive tape; although the device uses the adhesive tape for sealing, the application field of the device is not the packaging, the sealing requirements are different, and the sealing functions are different.
In conclusion, when the metal bar is prepared by the cold isostatic pressing method, a proper sheath packaging mode needs to be selected, so that the sheath sealing performance can be ensured, the operation is simplified, the working efficiency can be improved, and the cost is reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a cold isostatic pressing preparation method of a metal bar, wherein in the cold isostatic pressing process of metal powder, an adhesive tape and a plastic film are used for wrapping and sealing a sealing part together, and are fixed by a fastener, and after cold isostatic pressing, the sealing part is unsealed and separated by demoulding; the method has the advantages of good sealing performance of the sheath, simple operation, effectively improved production efficiency and reduced cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a cold isostatic pressing preparation method of a metal bar, which comprises the following steps:
(1) Filling metal powder into a sheath, compacting, then plugging a sealing plug into the sheath, and wrapping the joint of the sealing plug and the sheath by using an adhesive tape;
(2) After the wrapping in the step (1) is finished, sequentially wrapping the wrapping by using a plastic film and an adhesive tape, and hooping the wrapping position on the wrapping sleeve by using a fastener to finish the sealing of the wrapping sleeve;
(3) Carrying out cold isostatic pressing treatment on the sheath sealed in the step (2);
(4) And (4) after the cold isostatic pressing treatment in the step (3), opening the fastener, cutting off the adhesive tape and the plastic film, taking out the sealing plug, and then performing demoulding treatment to obtain the metal bar.
The invention, cold isostatic pressing method is one of the methods of powder metallurgy shaping, and while preparing the metal bar, it is the important factor that influences the performance of the shaping product to the selection and sealing operation of the wrap, the invention is while sealing the wrap, use tape and plastic film to wrap up the sealed place, utilize the cohesiveness of the tape, seal the space between covering and the plug, seal the wrap according to the order of tape-plastic film-tape, and fix with the fastener, achieve better sealed effect, and easy and simple to handle, after processing shaping through cold isostatic pressing, through the removal of fastener, tape and plastic film, take out after taking out the plug, demold and separate the shaping product and wrap, the metal bar can also be taken out directly, has simplified the separation operation of wrap and product, the density and intensity of the resulting metal bar are higher; the method of the invention has simple operation, can effectively improve the production efficiency and reduce the cost.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
In a preferred embodiment of the present invention, the material of the metal powder in step (1) includes any one of tantalum, a tantalum alloy, niobium, and a niobium alloy.
Preferably, the particle size of the metal powder in step (1) is 3 to 20 μm, for example 3 μm, 4 μm, 5 μm, 6 μm, 8 μm, 10 μm, 12 μm, 15 μm or 20 μm, but is not limited to the recited values, and other values not recited in this range are also applicable.
As a preferable technical scheme of the invention, the material of the sheath in the step (1) comprises any one of rubber, latex or plastics.
Preferably, the cross-sectional shape of the sheath in the step (1) is round or square.
In a preferred embodiment of the present invention, the material of the sealing plug in the step (1) includes rubber or polyurethane.
In the invention, the step of plugging the sealing plug into the sheath in the step (1) refers to the step of plugging the opening end of the sheath by using the sealing plug.
Preferably, the adhesive tape of step (1) comprises a scotch tape.
Preferably, the number of turns of the tape wrapping of step (1) is at least fifteen turns, such as fifteen turns, eighteen turns, twenty-two turns, twenty-five turns, or the like.
As a preferable technical scheme of the invention, the plastic film in the step (2) comprises a polyethylene preservative film or a polyvinyl chloride preservative film.
Preferably, the adhesive tape of step (2) comprises a transparent adhesive tape.
Preferably, the plastic film and the adhesive tape in step (2) are independently wrapped at least two times, for example, two times, three times, four times, etc.
As the preferable technical scheme of the invention, the fastener in the step (2) comprises a hoop.
Preferably, the fastening member in step (2) is made of metal, and preferably comprises stainless steel.
In the invention, the fastener is used for preventing the sheath from expanding due to excessive pressure so as to prevent the tightness of the sheath from being influenced.
In a preferred embodiment of the present invention, the cold isostatic pressing in step (3) has a pressure of 100 to 300MPa, for example, 100MPa, 150MPa, 200MPa, 250MPa, or 300MPa, but the pressure is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
Preferably, the pressure of the cold isostatic pressing in the step (3) is provided by a cold isostatic pressing machine.
Preferably, the cold isostatic pressing in step (3) is performed for a period of 5 to 60min, such as 5min, 10min, 15min, 20min, 25min, 30min, 40min, 50min or 60min, but not limited to the recited values, and other values not recited in this range are also applicable.
As a preferable technical scheme of the invention, the adhesive tape and the plastic film in the step (4) are cut off by a cutter.
Preferably, the demolding treatment of step (4) includes: and inserting the flat structural part between the sheath and the formed metal bar, and moving up and down until the metal bar is separated from the sheath.
Preferably, the flat structure comprises a metal rule.
As a preferable embodiment of the present invention, after the mold release treatment in the step (4), the flat structural member is taken out, and the metal bar is poured out.
Preferably, the shape of the metal bar of step (4) is cylindrical or prismatic.
Preferably, the length-to-diameter ratio or aspect ratio of the metal rod of step (4) is 1 to 10, such as 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, but not limited to the recited values, and other values not recited within the range of values are also applicable.
As a preferable technical scheme of the invention, the preparation method comprises the following steps:
(1) Putting metal powder into a sheath, compacting, wherein the material of the metal powder comprises any one of tantalum, tantalum alloy, niobium or niobium alloy, the particle size is 3-20 mu m, the material of the sheath comprises any one of rubber, latex or plastics, a sealing plug is plugged into the sheath, the material of the sealing plug comprises rubber or polyurethane, then a transparent adhesive tape is used for wrapping the joint of the sealing plug and the sheath, and the number of turns wrapped by the adhesive tape is at least fifteen turns;
(2) After the wrapping in the step (1) is finished, sequentially wrapping with a plastic film and a transparent adhesive tape, wherein the plastic film comprises a polyethylene preservative film or a polyvinyl chloride preservative film, the plastic film and the adhesive tape are independently wrapped for at least two circles, then hooping the wrapped position on the sheath by using a fastener, and the fastener comprises a hoop to finish sheath sealing;
(3) Carrying out cold isostatic pressing treatment on the sheath sealed in the step (2), wherein the pressure of the cold isostatic pressing is 100-300 MPa, and the time is 5-60 min;
(4) And (4) after the cold isostatic pressing treatment in the step (3), opening the fastening piece, cutting off the adhesive tape and the plastic film by using a cutter, taking out the sealing plug, and then performing demoulding treatment, wherein the demoulding treatment comprises the following steps: and inserting the flat structural part between the sheath and the formed metal bar, moving up and down until the metal bar is separated from the sheath, and obtaining the metal bar.
Compared with the prior art, the invention has the following beneficial effects:
(1) In the method, in the cold isostatic pressing process of the metal powder, the sealing position is wrapped by the adhesive tape and the plastic film, the sheath is sealed according to the sequence of the adhesive tape, the plastic film and the adhesive tape and is fixed by the fastening piece, the sealing effect is good, the operation is simple and convenient, after the cold isostatic pressing process, the fastening piece, the adhesive tape and the plastic film are removed, the demoulding separation is rapidly carried out, the separation operation of the sheath and the product is simplified, and the production efficiency and the product qualification rate are high;
(2) The method of the invention has simple operation, can effectively improve the production efficiency and reduce the cost.
Detailed Description
In order to better explain the present invention and to facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the present invention, which is defined by the claims.
The invention provides a cold isostatic pressing preparation method of a metal bar, which comprises the following steps:
(1) Filling metal powder into a sheath, compacting, then plugging a sealing plug into the sheath, and wrapping the joint of the sealing plug and the sheath by using an adhesive tape;
(2) After the wrapping in the step (1) is finished, sequentially wrapping the wrapping positions by using a plastic film and an adhesive tape, and then hooping the wrapping positions on the wrapping sleeve by using a fastener to finish the sealing of the wrapping sleeve;
(3) Carrying out cold isostatic pressing treatment on the sheath sealed in the step (2);
(4) And (4) after the cold isostatic pressing treatment in the step (3), opening the fastener, cutting off the adhesive tape and the plastic film, taking out the sealing plug, and then performing demoulding treatment to obtain the metal bar.
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides a cold isostatic pressing preparation method of a metal bar, which comprises the following steps:
(1) Putting tantalum metal powder into a sheath, compacting, wherein the average particle size of the metal powder is 9 microns, the sheath is made of rubber, a sealing plug is plugged into the sheath, the sealing plug is made of rubber, and then a transparent adhesive tape is used for wrapping a joint of the sealing plug and the sheath, wherein the number of wrapping turns is twenty turns;
(2) After the wrapping in the step (1) is finished, sequentially wrapping the bag with a polyethylene preservative film and a transparent adhesive tape, wrapping the preservative film with two circles of transparent adhesive tape for one circle, and hooping the wrapped position on the bag by using a stainless steel hoop to finish the sealing of the bag;
(3) Carrying out cold isostatic pressing treatment on the sheath sealed in the step (2), wherein the pressure of the cold isostatic pressing is 150MPa, and the time is 25min;
(4) After the cold isostatic pressing treatment in the step (3), opening the hoop, cutting off the adhesive tape and the preservative film by using a cutter, taking out the sealing plug, and then performing demoulding treatment, wherein the demoulding treatment comprises the following steps: and inserting the steel ruler between the sheath and the formed metal bar, moving the steel ruler up and down until the metal bar is separated from the sheath, and obtaining the tantalum metal bar.
In the embodiment, the tantalum metal bar prepared by the method has the advantages of good sheath sealing performance, high qualified rate of the obtained bar product, simple and convenient operation and high production efficiency.
Example 2:
the embodiment provides a cold isostatic pressing preparation method of a metal bar, which comprises the following steps:
(1) Putting tantalum metal powder into a sheath, compacting, wherein the average particle size of the metal powder is 5.5 microns, the sheath is made of polyurethane, a sealing plug is plugged into the sheath, the sealing plug is made of polyurethane, and a transparent adhesive tape is used for wrapping a joint between the sealing plug and the sheath for fifteen turns;
(2) After the wrapping in the step (1) is finished, sequentially wrapping the bag with a polyethylene preservative film and a transparent adhesive tape, wrapping the preservative film for two circles, wrapping the transparent adhesive tape for two circles, and hooping the wrapped position on the bag by using a stainless steel hoop to finish the sealing of the bag;
(3) Performing cold isostatic pressing treatment on the sheath sealed in the step (2), wherein the pressure of the cold isostatic pressing is 200MPa, and the time is 45min;
(4) After the cold isostatic pressing treatment in the step (3), opening the hoop, cutting off the adhesive tape and the preservative film by using a cutter, taking out the sealing plug, and then performing demoulding treatment, wherein the demoulding treatment comprises the following steps: and inserting the steel ruler between the sheath and the formed metal bar, moving the steel ruler up and down until the metal bar is separated from the sheath, and obtaining the tantalum metal bar.
In the embodiment, the tantalum metal bar prepared by the method has the advantages of good sheath sealing performance, high qualified rate of the obtained bar product, simple and convenient operation and high production efficiency.
Example 3:
the embodiment provides a cold isostatic pressing preparation method of a metal bar, which comprises the following steps:
(1) Putting tantalum alloy metal powder into a sheath, compacting, wherein the average particle size of the metal powder is 15 microns, the sheath is made of latex, a sealing plug is plugged into the sheath, the sealing plug is made of polyurethane, and then a transparent adhesive tape is used for wrapping the joint between the sealing plug and the sheath, wherein the number of wrapping turns is twenty-three turns;
(2) After the wrapping in the step (1) is finished, sequentially wrapping the bag with a polyvinyl chloride preservative film and a transparent adhesive tape, wrapping the preservative film with two circles of transparent adhesive tape for one circle, and hooping the wrapped position on the bag by using an aluminum alloy hoop to finish the sealing of the bag;
(3) Carrying out cold isostatic pressing treatment on the sheath sealed in the step (2), wherein the pressure of the cold isostatic pressing is 100MPa, and the time is 60min;
(4) After the cold isostatic pressing treatment in the step (3), opening the anchor ear, cutting off the adhesive tape and the preservative film by using a cutter, taking out the sealing plug, and then performing demoulding treatment, wherein the demoulding treatment comprises the following steps: and inserting the steel ruler between the sheath and the formed metal bar, moving the steel ruler up and down until the metal bar is separated from the sheath, and obtaining the tantalum alloy metal bar.
In the embodiment, the tantalum alloy metal bar is prepared by the method, the sealing performance of the sheath in the method is good, the qualified rate of the obtained bar product is high, the operation is simple and convenient, and the production efficiency is high.
Example 4:
the embodiment provides a cold isostatic pressing preparation method of a metal bar, which comprises the following steps:
(1) Putting niobium metal powder into a sheath, compacting, wherein the average particle size of the metal powder is 4 microns, the sheath is made of rubber, a sealing plug is plugged into the sheath, the sealing plug is made of rubber, and then a transparent adhesive tape is used for wrapping the joint between the sealing plug and the sheath, wherein the number of wrapping turns is eighteen turns;
(2) After the wrapping in the step (1) is finished, sequentially wrapping the bag with a polyethylene preservative film and a transparent adhesive tape, wrapping the preservative film for one circle, wrapping the transparent adhesive tape for two circles, and hooping the wrapped position on the bag by using a stainless steel hoop to finish the sealing of the bag;
(3) Carrying out cold isostatic pressing treatment on the sheath sealed in the step (2), wherein the pressure of the cold isostatic pressing is 250MPa, and the time is 15min;
(4) After the cold isostatic pressing treatment in the step (3), opening the anchor ear, cutting off the adhesive tape and the preservative film by using a cutter, taking out the sealing plug, and then performing demoulding treatment, wherein the demoulding treatment comprises the following steps: and inserting a steel ruler between the sheath and the formed metal bar, moving up and down until the metal bar is separated from the sheath, and obtaining the niobium metal bar.
In the embodiment, the niobium metal bar prepared by the method has the advantages of good sheath sealing performance, high qualified rate of the obtained bar product, simple and convenient operation and high production efficiency.
Example 5:
the embodiment provides a cold isostatic pressing preparation method of a metal bar, which comprises the following steps:
(1) Putting niobium alloy metal powder into a sheath, compacting, wherein the average particle size of the metal powder is 12 microns, the sheath is made of polyurethane, plugging a sealing plug into the sheath, the sealing plug is made of rubber, and wrapping the joint of the sealing plug and the sheath by using a transparent adhesive tape, wherein the number of wrapping turns is twenty-five;
(2) After the wrapping in the step (1) is finished, sequentially wrapping the packaging bag by using a polyvinyl chloride preservative film and a transparent adhesive tape, wrapping the preservative film for two circles, wrapping the transparent adhesive tape for one circle, and hooping the wrapped position on the wrapping bag by using a stainless steel hoop to finish the sealing of the wrapping bag;
(3) Performing cold isostatic pressing treatment on the sheath sealed in the step (2), wherein the pressure of the cold isostatic pressing is 300MPa, and the time is 10min;
(4) After the cold isostatic pressing treatment in the step (3), opening the anchor ear, cutting off the adhesive tape and the preservative film by using a cutter, taking out the sealing plug, and then performing demoulding treatment, wherein the demoulding treatment comprises the following steps: and inserting the steel ruler between the sheath and the formed metal bar, moving the steel ruler up and down until the metal bar is separated from the sheath, and obtaining the niobium alloy metal bar.
In the embodiment, the niobium alloy metal bar is prepared by the method, the sealing performance of the sheath in the method is good, the obtained bar product has high qualification rate, and the method is simple and convenient to operate and has high production efficiency.
Comparative example 1:
this comparative example provides a cold isostatic pressing process for the production of a metal bar, which is comparable to the process of example 1, except that: the wrapping operation of the preservative film and the transparent adhesive tape in the step (2) is not included, and fifteen circles of transparent adhesive tape are directly wrapped in the step (1).
In the comparative example, the wrap is wrapped only by the transparent adhesive tape when the wrap is sealed, a preservative film is not used, the tightness of the wrap is poor, the uniform stress of the powder at each part cannot be ensured during cold isostatic pressing, the uniformity of the product is weakened, and the qualified rate is reduced.
It can be seen from the above examples and comparative examples that, in the method of the present invention, in the metal powder cold isostatic pressing process, the tape and the plastic film are used to wrap the sealed part, the sheath is sealed according to the sequence of tape-plastic film-tape, and is fixed by the fastener, the sealing effect is good, the operation is simple, after cold isostatic pressing, the fastener, the tape and the plastic film are removed, the demoulding separation is rapidly performed, the separation operation of the sheath and the product is simplified, and the production efficiency and the product qualification rate are high; the method is simple and convenient to operate, and can effectively improve the production efficiency and reduce the cost.
The present invention is illustrated in detail by the examples given above, but the present invention is not limited to the details given above, which means that the present invention is not limited to the details given above. It will be apparent to those skilled in the art that any modifications to the present invention, equivalents of the method of the present invention and additions of ancillary steps, selection of specific means, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A cold isostatic pressing preparation method of a metal bar is characterized by comprising the following steps:
(1) Filling metal powder into a sheath, compacting, then plugging the sealing plug into the sheath, and wrapping the joint of the sealing plug and the sheath by using an adhesive tape;
(2) After the wrapping in the step (1) is finished, sequentially wrapping the wrapping by using a plastic film and an adhesive tape, and hooping the wrapping position on the wrapping sleeve by using a fastener to finish the sealing of the wrapping sleeve;
(3) Carrying out cold isostatic pressing treatment on the sheath sealed in the step (2);
(4) And (4) after the cold isostatic pressing treatment in the step (3), opening the fastener, cutting off the adhesive tape and the plastic film, taking out the sealing plug, and then performing demoulding treatment to obtain the metal bar.
2. The method according to claim 1, wherein the material of the metal powder in step (1) comprises any one of tantalum, tantalum alloy, niobium or niobium alloy;
preferably, the metal powder of step (1) has a particle size of 3 to 20 μm.
3. The preparation method according to claim 1 or 2, wherein the material of the sheath in the step (1) comprises any one of rubber, latex or plastic;
preferably, the cross-sectional shape of the sheath in step (1) is round or square.
4. The method according to any one of claims 1 to 3, wherein the material of the sealing plug in the step (1) comprises rubber or polyurethane;
preferably, the adhesive tape of step (1) comprises a scotch tape;
preferably, the number of turns of the tape wrapping of step (1) is at least fifteen turns.
5. The production method according to any one of claims 1 to 4, wherein the plastic film of step (2) comprises a polyethylene wrap or a polyvinyl chloride wrap;
preferably, the adhesive tape of step (2) comprises a scotch tape;
preferably, the plastic film and the adhesive tape of step (2) are independently wrapped at least two times.
6. The method of any one of claims 1-5, wherein the fasteners of step (2) comprise a hoop;
preferably, the fastener in step (2) is made of metal, and preferably comprises stainless steel.
7. The production method according to any one of claims 1 to 6, wherein the cold isostatic pressure in step (3) is 100 to 300MPa;
preferably, the pressure of the cold isostatic pressing in the step (3) is provided by a cold isostatic pressing machine;
preferably, the time of the cold isostatic pressing in the step (3) is 5-60 min.
8. The production method according to any one of claims 1 to 7, wherein the adhesive tape and the plastic film of step (4) are cut off with a cutter;
preferably, the demolding treatment of step (4) includes: inserting the flat structural member between the sheath and the formed metal bar to move up and down until the metal bar is separated from the sheath;
preferably, the flat structural member comprises a metal rule.
9. The method according to any one of claims 1 to 8, wherein after the demolding treatment in the step (4), the flat structural member is taken out, and the metal bar is poured out;
preferably, the shape of the metal bar of step (4) is cylindrical or prismatic;
preferably, the length-diameter ratio or the length-diameter ratio of the metal bar in the step (4) is 1 to 10.
10. The method for preparing a composite material according to any one of claims 1 to 9, comprising the steps of:
(1) Putting metal powder into a sheath and compacting, wherein the metal powder is made of any one of tantalum, tantalum alloy, niobium or niobium alloy and has the particle size of 3-20 microns, the sheath is made of any one of rubber, latex or plastic, a sealing plug is plugged into the sheath and is made of rubber or polyurethane, a transparent adhesive tape is used for wrapping the joint of the sealing plug and the sheath, and the number of turns of wrapping of the adhesive tape is at least fifteen turns;
(2) After the wrapping in the step (1) is finished, sequentially wrapping the plastic film and the transparent adhesive tape, wherein the plastic film comprises a polyethylene preservative film or a polyvinyl chloride preservative film, the plastic film and the adhesive tape are independently wrapped for at least two circles, and then hooping the wrapped position on the sheath by using a fastening piece, wherein the fastening piece comprises a hoop, so that the sheath sealing is finished;
(3) Carrying out cold isostatic pressing treatment on the sheath sealed in the step (2), wherein the pressure of the cold isostatic pressing is 100-300 MPa, and the time is 5-60 min;
(4) And (4) after the cold isostatic pressing treatment in the step (3), opening the fastening piece, cutting off the adhesive tape and the plastic film by using a cutter, taking out the sealing plug, and then performing demoulding treatment, wherein the demoulding treatment comprises the following steps: and inserting the flat structural part between the sheath and the formed metal bar, moving up and down until the metal bar is separated from the sheath, and obtaining the metal bar.
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| JP2006241595A (en) * | 2005-02-01 | 2006-09-14 | Tosoh Corp | Sinter, sputtering target and molding die, and production process of sintered compact |
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