CN115301948A - Hot isostatic pressing method for avoiding product adhesion - Google Patents
Hot isostatic pressing method for avoiding product adhesion Download PDFInfo
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- CN115301948A CN115301948A CN202211083037.6A CN202211083037A CN115301948A CN 115301948 A CN115301948 A CN 115301948A CN 202211083037 A CN202211083037 A CN 202211083037A CN 115301948 A CN115301948 A CN 115301948A
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- isostatic pressing
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- 238000001513 hot isostatic pressing Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 46
- 229910052751 metal Inorganic materials 0.000 claims abstract description 67
- 239000002184 metal Substances 0.000 claims abstract description 67
- 238000003466 welding Methods 0.000 claims abstract description 37
- 239000011248 coating agent Substances 0.000 claims abstract description 31
- 238000000576 coating method Methods 0.000 claims abstract description 31
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 29
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 29
- 238000005520 cutting process Methods 0.000 claims abstract description 22
- 239000002131 composite material Substances 0.000 claims abstract description 21
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000007872 degassing Methods 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 9
- 239000002390 adhesive tape Substances 0.000 claims description 8
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 7
- 239000010962 carbon steel Substances 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 5
- 230000000873 masking effect Effects 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
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- 229910052786 argon Inorganic materials 0.000 claims description 2
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 4
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- 229910052582 BN Inorganic materials 0.000 description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000009924 canning Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
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Images
Classifications
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
-
- 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
- B22F3/005—Loading or unloading powder metal objects
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/1208—Containers or coating used therefor
- B22F3/1258—Container manufacturing
- B22F3/1266—Container manufacturing by coating or sealing the surface of the preformed article, e.g. by melting
Abstract
The invention relates to a hot isostatic pressing method for avoiding product adhesion, comprising the following steps: shielding the welding position of the metal plate, spraying a sodium silicate and aluminum oxide composite coating inside the metal plate, removing a shielding object, and drying the metal plate; the metal plate surrounds the side face of the blank to be subjected to hot isostatic pressing, then the metal plate and the cover plate are welded, and the obtained sheath is subjected to vacuum treatment, gas-closing treatment and hot isostatic pressing treatment in sequence; and cutting the sheath subjected to the hot isostatic pressing treatment, and removing the sheath to obtain a product. According to the invention, the shielded side sheath is coated with the composite coating of sodium silicate and aluminum oxide, so that the problems of adhesion between the product and the sheath, pollution to the product and the like in the hot isostatic pressing process are avoided; and after hot isostatic pressing, carrying out plasma cutting on the welding edge, so that the rapid separation of the sheath and the product can be realized.
Description
Technical Field
The invention belongs to the technical field of powder metallurgy, and particularly relates to a hot isostatic pressing method for avoiding product adhesion.
Background
Hot isostatic pressing refers to a method in which an article is placed in a closed container, and sintering and densification of the article are performed by applying an isotropic pressure to the article and simultaneously applying a high temperature to the article under the action of the high temperature and the high pressure. Hot isostatic pressing sintering is mainly applied to densification sintering of powder and blocks, and due to the special pressurization mode, powder needs to be subjected to canning treatment before sintering, and the powder needs to be subjected to canning if a sample is required to be subjected to diffusion bonding.
CN114406261A discloses a sheathing mould and a sheathing method for hot isostatic pressing sintering, wherein the sheathing mould comprises a cylinder structure consisting of a bottom pad and a sheath, an upper pressure head is arranged at the top of the cylinder, and the outer diameter of the upper pressure head is smaller than the inner diameter of the cylinder structure; the sample to be sheathed is arranged in the barrel structure, the sample to be sheathed is sheathed by the sheath sleeve, two ends of the sheath sleeve are clamped by the gasket I, an upper sleeve pressure head is arranged between the gasket I close to the upper pressure head and the upper pressure head, and a gasket II, a die sleeve and a lower sleeve barrel pressure head are sequentially arranged between the gasket I close to the bottom pad and the bottom pad from one side of the gasket I. The high vacuum in the sheath and the welding of the sheath can be realized in one step.
With the use and development of various novel materials, materials and products which are difficult to produce in the traditional casting mode can be manufactured through powder metallurgy, refractory metals, compounds and pseudo alloys can be processed, raw materials are saved through relative casting, and the production cost is obviously reduced. In recent years, materials prepared by powder metallurgy are more widely used, and the materials are widely used in the fields of aerospace, new energy, machinery, electronics and the like. However, the adhesion between the product and the sheath material is serious in the hot isostatic pressing process of the existing high-purity powder metallurgy product, the sheath is difficult to remove, and the material on the surface of the product can be torn off, so that the surface state of the product is rough, and the subsequent processing is influenced.
CN109550960A discloses a method for preventing a hot isostatic pressing sintered part from being adhered to a sheath, wherein if a raw material to be subjected to hot isostatic pressing is a plate blank or a bar blank, the plate blank or the bar blank to be subjected to hot isostatic pressing is wrapped by graphite paper, the surface layer of the graphite paper is uniformly coated by boron nitride coating, and then the graphite paper coated with the boron nitride coating is wrapped and placed into the sheath. The method is characterized in that the graphite paper is coated with boron nitride coating, and the graphite paper is placed between a sheath and a product. However, after experiments, the impurity content of the high-purity product is easily increased by using the graphite paper under the high-temperature condition, and the purity of the product is greatly reduced.
Therefore, in view of the problems in the prior art, it is desirable to develop a method for preventing the adhesion between the wrapping and the product with low cost and without affecting the purity of the product.
Disclosure of Invention
The invention aims to provide a hot isostatic pressing method for avoiding product adhesion, which avoids the adhesion between a sheath and a product without influencing the purity of the product by spraying a composite coating of sodium silicate and alumina inside the sheath.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a hot isostatic pressing method for avoiding product adhesion, which comprises the following steps:
(1) Shielding the welding position of the metal plate, spraying a sodium silicate and aluminum oxide composite coating inside the metal plate, removing a shielding object, and drying the metal plate;
(2) The metal plate surrounds the side face of the blank to be subjected to hot isostatic pressing, then the metal plate and the cover plate are welded, and the obtained sheath is subjected to vacuum treatment, gas-closing treatment and hot isostatic pressing treatment in sequence;
(3) And (3) cutting the sheath subjected to the hot isostatic pressing treatment in the step (2), and removing the sheath to obtain a product.
According to the invention, the composite coating of sodium silicate and aluminum oxide is adopted to spray the interior of the shielded metal plate, so that the problems of adhesion between the product and the sheath, pollution to the high-purity product and the like in the hot isostatic pressing process are avoided, plasma cutting is carried out on the welding position of the sheath after the hot isostatic pressing, the rapid separation of the sheath and the product can be realized, after the hot isostatic pressing, the surface of the product is not peeled off, no coating is left, the interior of the sheath is flat, and the influence on the surface of a target blank is small.
As a preferable technical scheme of the invention, the material of the metal plate in the step (1) comprises carbon steel and/or stainless steel.
As a preferable embodiment of the present invention, the masking process in the step (1) is: and attaching adhesive tapes to the welding positions of the metal plates.
Preferably, the metal plate welding position is within 4-6mm of the metal plate bending edge, such as 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm or 6mm, but not limited to the recited values, and other values not recited in the numerical range are also applicable.
According to the invention, the adhesive tape is attached within 4-6mm of the bent edge of the metal plate, so that the problems of unstable welding and the like when the bent edge of the metal plate is welded with the cover plate are avoided.
As a preferred embodiment of the present invention, the mass ratio of the sodium silicate to the alumina in step (1) is 3 (1-3), and may be, for example, 3.
Preferably, the thickness of the composite coating layer in step (1) is 0.4-0.6mm, such as 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, 0.5mm, 0.52mm, 0.54mm, 0.56mm, 0.58mm, or 0.6mm, but not limited to the recited values, and other values not recited in the range of values are also applicable.
According to the invention, the composite coating of the sodium silicate and the aluminum oxide is sprayed on the inner part of the metal plate by controlling the mass ratio of the sodium silicate to the aluminum oxide and the thickness of the composite coating, so that the adhesion between the sheath and the product is avoided, and the sprayed composite material does not pollute the high-purity product.
As a preferred embodiment of the present invention, the drying temperature in the step (1) is 20 to 30 ℃ and may be, for example, 20 ℃, 22 ℃, 24 ℃, 26 ℃, 28 ℃ or 30 ℃, but the present invention is not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the drying time in step (1) is not less than 24h, such as 24h, 26h, 28h, 30h or 35h, but not limited to the recited values, and other values not recited in the numerical range are also applicable.
As a preferable technical scheme of the invention, the welding in the step (2) is as follows: and welding the two metal plates and the two cover plates to obtain a sheath, and arranging a degassing pipe at the welding position of the sheath.
The hot isostatic pressing sheath after welding is of a fully-closed structure.
In the invention, the cover plate is made of carbon steel and/or stainless steel.
Preferably, the material of the degassing pipe comprises carbon steel and/or stainless steel.
As a preferable technical scheme of the invention, the protective gas for welding in the step (2) comprises helium and/or argon.
As a preferable technical scheme of the invention, the vacuum treatment in the step (2) is as follows: vacuum degree is reduced to less than 1 × 10 at 20-30 deg.C -2 Pa, heating to 300-500 deg.C, and pumping to vacuum degree of less than 6 × 10 -3 Pa。
The vacuum treatment in the step (2) of the invention is divided into two-stage vacuum treatment, wherein the first stage vacuum treatment is to pump the vacuum degree to less than 1 x 10 at the temperature of 20-30 DEG C -2 Pa; the second stage of vacuum treatment is to heat to 300-500 deg.C and pump the vacuum to less than 6X 10 -3 Pa。
In the present invention, the temperature of the first stage vacuum treatment is 20 to 30 ℃ and may be, for example, 20 ℃, 22 ℃, 24 ℃, 26 ℃, 28 ℃ or 30 ℃, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
In the invention, the vacuum degree of the first stage vacuum treatment is less than 1 multiplied by 10 -2 Pa, for example, may be 9X 10 -3 Pa、7×10 -3 Pa、5×10 -3 Pa、3×10 -3 Pa or 1X 10 -3 Pa, etc., but are not limited to the recited values, and other values not recited within the numerical range are also applicable.
In the present invention, the temperature of the second stage vacuum treatment is 300 to 500 ℃, and for example, 300 ℃, 320 ℃, 340 ℃, 360 ℃, 380 ℃, 400 ℃, 420 ℃, 440 ℃, 460 ℃, 480 ℃ or 500 ℃ may be used, but the present invention is not limited to the recited values, and other values not recited in the numerical range are also applicable.
In the invention, the vacuum degree of the second stage vacuum treatment is less than 6 multiplied by 10 -3 Pa, for example, may be 5X 10 -3 Pa、4×10 -3 Pa、3×10 -3 Pa、1×10 -3 Pa or 1X 10 -4 Pa, etc., but are not limited to the recited values, and other values not recited within the numerical range are also applicable.
As a preferable technical solution of the present invention, the cutting process in the step (3) is: and cutting the welding position of the sheath by adopting plasma cutting equipment.
As a preferred technical scheme of the invention, the method comprises the following steps:
(1) Masking the adhesive tape attached to the welding position of the metal plate, spraying a composite coating of sodium silicate and aluminum oxide with the thickness of 0.4-0.6mm on the inner part of the metal plate, removing a mask, and drying the metal plate at the temperature of 20-30 ℃ for more than or equal to 24h, wherein the mass ratio of the sodium silicate to the aluminum oxide is 3 (1-3);
(2) Surrounding the metal plates on the side of the blank to be hot isostatic pressed, welding the two metal plates and the two cover plates to obtain a sheath, arranging a degassing tube at the welding position of the sheath, and pumping the sheath to a vacuum degree of less than 1 × 10 at 20-30 deg.C -2 Pa, heating to 300-500 deg.C, and pumping to vacuum degree of less than 6 × 10 -3 Pa, then carrying out gas-closing treatment and hot isostatic pressing treatment;
(3) And (3) cutting the weld of the sheath after the hot isostatic pressing treatment in the step (2) by using plasma cutting equipment, and removing the sheath to obtain a product.
The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between non-recited numerical ranges, and is not intended to be exhaustive or to limit the invention to the precise numerical values encompassed within the range for brevity and clarity.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the inner part of the shielded side sheath is coated with the composite coating of sodium silicate and aluminum oxide, so that the problems of adhesion between a product and the sheath, pollution to a high-purity product and the like in the hot isostatic pressing process are avoided, and the yield of the hot isostatic pressing blank is improved; and after hot isostatic pressing, plasma cutting is carried out on the welding edge, so that the rapid separation of the sheath and the product can be realized, and after hot isostatic pressing, the surface of the product is free from stripping and coating residue, the interior of the sheath is flat, and the influence on the surface of the target blank is small. The method disclosed by the invention is simple to operate, high in safety and suitable for industrial popularization.
Drawings
Fig. 1 is a schematic structural diagram of a metal plate provided in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a clad welded degasser tube as provided in example 1 of the present invention;
wherein: 1-spraying area, 2-shielding area and 3-degassing tube.
Detailed Description
The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The present embodiment provides a hot isostatic pressing method for avoiding product adhesion, wherein a schematic diagram of a structure of the metal plate is shown in fig. 1, a schematic diagram of a clad welded degasser tube is shown in fig. 2, and the method comprises the following steps:
(1) Masking the adhesive tape attached to the bent edge 2 within 5mm of the metal plate, spraying a sodium silicate and aluminum oxide composite coating with the thickness of 0.5mm on the inner part 1 of the metal plate, removing a mask, and drying the metal plate for 24 hours at 25 ℃; the mass ratio of the sodium silicate to the alumina is 3;
(2) Surrounding the side surface of the aluminum blank with the purity of 99.9% with metal plates, welding the two metal plates and the two cover plates to obtain a sheath, arranging a degassing tube 3 at the welding position of the sheath, and pumping the sheath to a vacuum degree of 9 × 10 at 25 deg.C -3 Pa, then raising the temperature to 400 ℃ and pumping the vacuum degree to 1X 10 -3 Pa, then carrying out gas-closing treatment and hot isostatic pressing treatment;
(3) Cutting the sheath welding position subjected to the hot isostatic pressing treatment in the step (2) by using plasma cutting equipment, and removing the sheath to obtain a product;
the metal plate, the cover plate and the degassing pipe are all made of carbon steel.
Example 2
The present embodiment provides a hot isostatic pressing method for avoiding product blocking, the method comprising the steps of:
(1) Shielding the adhesive tape attached to the bent edge of the metal plate within 4mm, spraying a composite coating of sodium silicate and aluminum oxide with the thickness of 0.4mm on the inner part of the metal plate, removing a shielding object, and drying the metal plate for 26 hours at 30 ℃; the mass ratio of the sodium silicate to the aluminum oxide is 3;
(2) The metal plates surround the side surface of the aluminum blank with the purity of 99.9 percent, two metal plates and two cover plates are welded to obtain a sheath, a degassing pipe is arranged at the welding position of the sheath, and the sheath is pumped to the vacuum degree of 9 multiplied by 10 at the temperature of 30 DEG C -3 Pa, then raising the temperature to 500 ℃ and pumping the vacuum degree to 6X 10 -4 Pa, then carrying out closed gas treatment and hot isostatic pressing treatment;
(3) Cutting the sheath welding position subjected to the hot isostatic pressing treatment in the step (2) by using plasma cutting equipment, and removing the sheath to obtain a product;
the metal plate, the cover plate and the degassing pipe are all made of stainless steel.
Example 3
The present embodiment provides a hot isostatic pressing method for avoiding product blocking, the method comprising the steps of:
(1) Shielding the adhesive tape attached to the bent edge of the metal plate within 6mm, spraying a sodium silicate and aluminum oxide composite coating with the thickness of 0.6mm on the inner part of the metal plate, removing a shielding object, and drying the metal plate for 28 hours at 20 ℃; the mass ratio of the sodium silicate to the alumina is 3;
(2) The metal plates surround the side surface of the aluminum blank with the purity of 99.9 percent, two metal plates and two cover plates are welded to obtain a sheath, a degassing pipe is arranged at the welding position of the sheath, and the sheath is pumped to the vacuum degree of 6 multiplied by 10 at the temperature of 20 DEG C -3 Pa, then raising the temperature to 400 ℃, and pumping the vacuum degree to 1 x 10 -3 Pa, then carrying out gas-closing treatment and hot isostatic pressing treatment;
(3) Cutting the sheath welding position subjected to the hot isostatic pressing treatment in the step (2) by using plasma cutting equipment, and removing the sheath to obtain a product;
the metal plate, the cover plate and the degassing pipe are all made of carbon steel.
Example 4
This example provides a hot isostatic pressing method for preventing blocking of products, which is the same as example 1 except that the mass ratio of sodium silicate to alumina in step (1) is 3.
Example 5
This example provides a hot isostatic pressing method for preventing blocking of products, which is the same as example 1 except that the mass ratio of sodium silicate to alumina in step (1) is 3.
Example 6
This example provides a hot isostatic pressing method for preventing adhesion of products, which is the same as example 1 except that the spraying of a 0.2mm thick composite coating of sodium silicate and alumina is performed inside the metal plate in step (1).
Example 7
This example provides a hot isostatic pressing method for preventing sticking of products, which is the same as example 1 except that the spraying of the composite coating of sodium silicate and alumina having a thickness of 0.8mm is performed on the inside of the metal plate in step (1).
Example 8
This example provides a hot isostatic pressing method to avoid sticking of the product, except that the capsule obtained in step (2) is evacuated to a vacuum of 9X 10 at 30 ℃ only -3 Except for Pa, the other conditions were the same as in example 1.
Comparative example 1
This comparative example provides a hot isostatic pressing method for preventing adhesion of products, which was the same as example 1 except that masking was not applied to the tape applied within 5mm of the bent edge of the metal plate in step (1).
Comparative example 2
This comparative example provides a hot isostatic pressing method for preventing sticking of products, which is the same as example 1 except that the inside of the metal plate is sprayed with an alumina coating having a thickness of 0.5mm in step (1).
Comparative example 3
This comparative example provides a hot isostatic pressing method for preventing adhesion of products, which is the same as example 1 except that the coating of sodium silicate having a thickness of 0.5mm is sprayed on the inside of the metal plate in step (1).
The surface states of the products obtained in the above examples and comparative examples were visually observed and the purity of the products was measured, and the results are shown in table 1.
TABLE 1
From table 1, the following points can be derived:
(1) According to the method provided by the embodiments 1-3 of the invention, the spraying of the sodium silicate and aluminum oxide composite coating is carried out inside the sheath, so that the sheath is prevented from being adhered to the high-purity aluminum blank, the surface of the product is not peeled off, no coating is left, and the purity of the product is not influenced;
(2) As can be seen from the comparison between example 1 and examples 4-7, when the mass ratio of sodium silicate to aluminum oxide and the thickness of the composite coating are not selected reasonably, the coating is peeled off and the anti-blocking effect is poor, so that the surface material of the product is peeled off after the jacket is removed or the coating is pressed on the surface of the product, and the post-processing of the product is influenced; from a comparison of examples 1 and 8, it can be seen that the degree of vacuum applied to the jacket was only 9X 10 at 30 ℃ when the jacket was evacuated to a vacuum level of 9X 10 -3 Pa, incomplete sintering of the product due to insufficient vacuum degree, and further reduction of product purity;
(3) As can be seen from the comparison between the example 1 and the comparative example 1, when the welding position of the metal plate is not shielded, the welding between the metal plate and the cover plate is not firm, the obtained sheath has poor sealing performance, the sheath leaks air, the sintering of the product is incomplete, and the purity of the product is further reduced;
(4) As can be seen from the comparison between the embodiment 1 and the comparative examples 2-3, when the metal plate is sprayed only with the alumina or sodium silicate coating, the coating is easy to fall off and can not separate the sheath from the product well, so that the surface material of the product is peeled off after the sheath is removed, the post-processing of the product is influenced, and the purity of the product is slightly reduced.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A method for hot isostatic pressing for avoiding product blocking, the method comprising the steps of:
(1) Shielding the welding position of the metal plate, spraying a sodium silicate and aluminum oxide composite coating on the interior of the metal plate, removing a shielding object, and drying the metal plate;
(2) The metal plate surrounds the side face of the blank to be subjected to hot isostatic pressing, then the metal plate and the cover plate are welded, and the obtained sheath is subjected to vacuum treatment, gas-closing treatment and hot isostatic pressing treatment in sequence;
(3) And (3) cutting the sheath subjected to the hot isostatic pressing treatment in the step (2), and removing the sheath to obtain a product.
2. The method of claim 1, wherein the metal plate of step (1) comprises carbon steel and/or stainless steel.
3. The method according to claim 1 or 2, wherein the masking process of step (1) is: attaching adhesive tapes to the welding positions of the metal plates;
preferably, the welding position of the metal plates is within 4-6mm of the bent edge of the metal plates.
4. The method according to any one of claims 1 to 3, wherein the mass ratio of the sodium silicate to the alumina in the step (1) is 3 (1-3);
preferably, the thickness of the composite coating in the step (1) is 0.4-0.6mm.
5. The method according to any one of claims 1 to 4, wherein the temperature of the drying in step (1) is 20 to 30 ℃;
preferably, the drying time of the step (1) is more than or equal to 24 hours.
6. The method according to any one of claims 1 to 5, wherein the welding of step (2) is: welding the two metal plates and the two cover plates to obtain a sheath, and arranging a degassing pipe at the welding position of the sheath;
preferably, the material of the degassing pipe comprises carbon steel and/or stainless steel.
7. The method according to any one of claims 1 to 6, wherein the shielding gas for the welding of step (2) comprises helium and/or argon.
8. The method according to any one of claims 1 to 7, wherein the vacuum treatment of step (2) is: vacuum degree is reduced to less than 1 × 10 at 20-30 deg.C -2 Pa, heating to 300-500 deg.C, and pumping to vacuum degree of less than 6 × 10 -3 Pa。
9. The method according to any one of claims 1 to 8, wherein the cutting process of step (3) is: and cutting the welding position of the sheath by adopting plasma cutting equipment.
10. A method according to any one of claims 1-9, characterized in that the method comprises the steps of:
(1) Shielding the adhesive tape attached to the welding position of the metal plate, spraying a composite coating of sodium silicate and aluminum oxide with the thickness of 0.4-0.6mm on the inner part of the metal plate, removing a shielding object, and drying the metal plate at the temperature of 20-30 ℃ for more than or equal to 24h, wherein the mass ratio of the sodium silicate to the aluminum oxide is 3 (1-3);
(2) The metal plates surround the side of the blank to be hot isostatic pressed, the two metal plates and the two cover plates are welded to obtain a sheath, a degassing pipe is arranged at the welding position of the sheath, and the sheath is pumped to a vacuum degree of less than 1 x 10 at the temperature of 20-30 DEG C -2 Pa, heating to 300-500 deg.C, and pumping to vacuum degree of less than 6 × 10 -3 Pa, then carrying out gas-closing treatment and hot isostatic pressing treatment;
(3) And (3) cutting the weld of the sheath after the hot isostatic pressing treatment in the step (2) by using plasma cutting equipment, and removing the sheath to obtain a product.
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| CN113831128A (en) * | 2021-09-30 | 2021-12-24 | 宁波江丰电子材料股份有限公司 | Processing method for graphite hot isostatic pressing |
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