CN114227899B - Method for compounding metal hydride ceramic thin-wall tube and stainless steel thin-wall tube - Google Patents
Method for compounding metal hydride ceramic thin-wall tube and stainless steel thin-wall tube Download PDFInfo
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- CN114227899B CN114227899B CN202111559305.2A CN202111559305A CN114227899B CN 114227899 B CN114227899 B CN 114227899B CN 202111559305 A CN202111559305 A CN 202111559305A CN 114227899 B CN114227899 B CN 114227899B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
- B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
- B28B21/36—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means applying fluid pressure or vacuum to the material
- B28B21/38—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means applying fluid pressure or vacuum to the material introducing the material wholly or partly under pressure ; Injection-moulding machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
- B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
- B28B21/36—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means applying fluid pressure or vacuum to the material
- B28B21/40—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means applying fluid pressure or vacuum to the material by evacuating one or more of the mould parts ; Vacuum machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/58—Steel tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/76—Moulds
- B28B21/82—Moulds built-up from several parts; Multiple moulds; Moulds with adjustable parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/86—Cores
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
Abstract
The invention belongs to the technical field of thin-walled tube compounding methods, and particularly relates to a method for compounding a metal hydride ceramic thin-walled tube and a stainless steel thin-walled tube. The invention provides a method for compounding a metal hydride ceramic thin-wall tube and a stainless steel thin-wall tube, which comprises the following steps: arranging a buffer ring at the connecting step of the stainless steel thin-wall pipe and the flange plate, and inserting an inner core mould matched with the stainless steel thin-wall pipe into the inner cavity of the stainless steel thin-wall pipe to obtain a stainless steel thin-wall pipe-inner core mould composite part; filling metal hydride ceramic powder around the stainless steel thin-wall pipe-inner core mould composite part, and carrying out cold isostatic pressing to obtain a blank; and machining the blank to form the metal hydride ceramic thin-wall pipe, and removing the inner core mould to obtain a composite piece formed by compounding the metal hydride ceramic thin-wall pipe and the stainless steel thin-wall pipe. The composite part provided by the method provided by the invention has no cracking, no edge breakage and no block falling, and the appearance of the thin-walled tube is stable.
Description
Technical Field
The invention belongs to the technical field of thin-walled tube compounding methods, and particularly relates to a method for compounding a metal hydride ceramic thin-walled tube and a stainless steel thin-walled tube.
Background
The metal hydride has important application prospect in the fields of high-temperature superconductors, new materials and the like, and is one of the most important research fields of the current condensed state physics. In order to research the change law and the equation of state of the metal hydride under the condition of ultrahigh pressure, a metal hydride thin-wall pipe with the inner diameter of 3mm, the outer diameter of 4mm and the length of 15mm and a stainless steel pipe thin-wall pipe with the inner diameter of 2mm, the outer diameter of 3mm and the length of 18mm are required to be compounded into a whole (wherein the lower end of the stainless steel pipe thin-wall pipe is provided with an annular flange connected with the stainless steel pipe thin-wall pipe), and the obtained sample piece is used as an experimental target.
The traditional method for compounding the metal hydride ceramic thin-wall tube and the stainless steel thin-wall tube comprises a pouring method and a compression molding method. When the metal hydride thin-wall tube is prepared by adopting a pouring method, a large number of cracks are generated when the metal hydride thin-wall tube is solidified from a molten state to a solid state, so that the obtained composite sample piece cannot meet the structural requirements of the change rule of the physical state and the state equation on the composite sample piece under the ultrahigh pressure condition. When the metal hydride thin-walled tube is directly prepared by compression molding, the tube with the length-diameter ratio larger than 3 is difficult to form. Therefore, in the existing method for compounding the metal hydride ceramic thin-wall pipe and the stainless steel thin-wall pipe, the problems that the metal hydride ceramic thin-wall pipe and the stainless steel thin-wall pipe form structural stress due to elastic after-effect and sharp corner stress at the joint of the central pipe and the flange is concentrated exist generally, so that a compound sample piece is easy to crack, break edges and fall blocks, and the thin-wall pipe is easy to deform.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for compounding a metal hydride ceramic thin-wall tube and a stainless steel thin-wall tube, which overcomes the problems that the metal hydride ceramic thin-wall tube and the stainless steel thin-wall tube have elastic after-effect to form structural stress and the stress of a connection sharp corner of a central tube and a flange is concentrated, and the obtained composite member has no cracking, no edge breakage and no block falling, and the thin-wall tube has stable morphology.
In order to achieve the purpose of the invention, the invention provides the following technical scheme:
the invention provides a method for compounding a metal hydride ceramic thin-wall tube and a stainless steel thin-wall tube, which comprises the following steps:
arranging a buffer ring at the connecting step of the stainless steel thin-wall pipe and the flange plate, and inserting an inner core mould matched with the stainless steel thin-wall pipe into the inner cavity of the stainless steel thin-wall pipe to obtain a stainless steel thin-wall pipe-inner core mould composite part;
filling metal hydride ceramic powder around the stainless steel thin-wall pipe-inner core mould composite part, and carrying out cold isostatic pressing to obtain a blank;
and machining the blank to form the metal hydride ceramic thin-wall pipe, and removing the inner core mould to obtain a composite piece formed by compounding the metal hydride ceramic thin-wall pipe and the stainless steel thin-wall pipe.
Preferably, the surface roughness of the inner surface of the stainless steel thin-wall pipe and the outer surface of the inner core mould is independently less than or equal to 1.6.
Preferably, the stainless steel thin-wall pipe is in tight fit with the inner core mould.
Preferably, the inner diameter of the stainless steel thin-wall pipe is 2mm, and the outer diameter of the stainless steel thin-wall pipe is 3mm;
the outer diameter of the inner core mould is 1.98-1.99 mm.
Preferably, the inner core mold is made of tungsten-nickel-iron alloy.
Preferably, the material of the buffer ring is polyvinyl chloride or polycarbonate; the thickness of the buffer ring is 0.1-0.3 mm.
Preferably, the metal hydride ceramic powder has a particle size of 0.15 to 0.425mm.
Preferably, the thickness of the metal hydride ceramic thin-wall tube is 0.5mm;
the relative complete compactness of the metal hydride ceramic thin-wall tube under 100MPa is more than or equal to 90 percent, and the relative complete compactness under 180MPa is more than or equal to 93 percent.
Preferably, the pressure of the cold isostatic pressing is 100-180 MPa, and the pressure maintaining time is 5-6 min.
Preferably, the chemical composition of the ferrotungsten-nickel alloy comprises: 91-95 wt.% of W, 3.5-7 wt.% of Ni and 1.5-2 wt.% of Fe.
The invention provides a method for compounding a metal hydride ceramic thin-walled tube and a stainless steel thin-walled tube, which comprises the following steps: arranging a buffer ring at the connecting step of the stainless steel thin-wall pipe and the flange plate, and inserting an inner core mould matched with the stainless steel thin-wall pipe into the inner cavity of the stainless steel thin-wall pipe to obtain a stainless steel thin-wall pipe-inner core mould composite part; filling metal hydride ceramic powder around the stainless steel thin-walled tube-inner core mould composite, and performing cold isostatic pressing to obtain a blank; and machining the blank to form the metal hydride ceramic thin-walled tube, and removing the inner core mould to obtain a composite piece formed by compounding the metal hydride ceramic thin-walled tube and the stainless steel thin-walled tube. In the invention, the inner core mould can effectively prevent the stainless steel thin-walled tube from deforming towards the inner side of the thin-walled tube in the cold isostatic pressing process, and slowly release the elastic after-effect stress; the buffer ring arranged at the connecting step of the stainless steel thin-wall pipe and the flange plate weakens the local concentrated stress of the sharp corner at the connecting step of the stainless steel thin-wall pipe and the flange plate, prevents the metal hydride ceramic powder from being directly formed into a stress concentrated sharp corner by hard extrusion at the connecting step of the stainless steel thin-wall pipe and the flange plate, and avoids the edge breakage and cracking of the metal hydride ceramic thin-wall pipe; in the invention, the inner core mould and the buffer ring are combined with cold isostatic pressing and machining, so that an effective composite part of the metal hydride ceramic thin-wall pipe and the stainless steel thin-wall pipe without the microcrack defect is obtained, and the prepared composite part meets the requirement of a high-precision physical experiment.
The embodiment test result shows that the metal hydride ceramic thin-wall pipe and stainless steel thin-wall pipe composite provided by the method provided by the invention overcomes the problems that the metal hydride ceramic thin-wall pipe and the stainless steel thin-wall pipe have elastic after-effect to form structural stress and the stress of the connection sharp corner of the central pipe and the flange is concentrated, and the obtained composite has no cracking, no edge breakage and no block falling and has stable thin-wall pipe appearance.
Drawings
FIG. 1 is a schematic view of a method for compounding a metal hydride ceramic thin-wall tube and a stainless steel thin-wall tube provided by the invention, wherein in FIG. 1, 1-an inner core mold, 2-the stainless steel thin-wall tube, 3-metal hydride ceramic powder, 4-a buffer ring, 5-a lower rubber partition layer, 6-an exhaust tube, 7-a rubber plug, 8-an upper rubber partition layer and 9-a soft mold;
FIG. 2 is a schematic diagram of the composite of the thin-walled ceramic metal hydride tube and the thin-walled stainless steel tube obtained in example 1;
FIG. 3 is a diagram of the composite of the metal hydride ceramic thin-wall tube and the stainless steel thin-wall tube obtained in example 2;
FIG. 4 is a schematic diagram of the composite of the thin-walled ceramic metal hydride tube and the thin-walled stainless steel tube obtained in example 3;
fig. 5 is a metallographic microscopic image of the metal hydride ceramic thin-walled tube in the composite of the metal hydride ceramic thin-walled tube and the stainless steel thin-walled tube obtained in example 1, with a magnification of 50 times.
Detailed Description
The invention provides a method for compounding a metal hydride ceramic thin-wall tube and a stainless steel thin-wall tube, which comprises the following steps:
arranging a buffer ring at the connecting step of the stainless steel thin-wall pipe and the flange plate, and inserting an inner core mould matched with the stainless steel thin-wall pipe into the inner cavity of the stainless steel thin-wall pipe to obtain a stainless steel thin-wall pipe-inner core mould composite part;
filling metal hydride ceramic powder around the stainless steel thin-wall pipe-inner core mould composite part, and carrying out cold isostatic pressing to obtain a blank;
and machining the blank to form the metal hydride ceramic thin-walled tube, and removing the inner core mould to obtain a composite piece formed by compounding the metal hydride ceramic thin-walled tube and the stainless steel thin-walled tube.
In the present invention, the components of the method are commercially available and well known to those skilled in the art unless otherwise specified.
And arranging a buffer ring at the connecting step of the stainless steel thin-wall pipe and the flange plate, and inserting an inner core mould matched with the stainless steel thin-wall pipe into the inner cavity of the stainless steel thin-wall pipe to obtain the stainless steel thin-wall pipe-inner core mould composite part.
In the present invention, the material of the cushion ring is preferably polyvinyl chloride or polycarbonate. In the present invention, the thickness of the cushion ring is preferably 0.1 to 0.3mm, and more preferably 0.12 to 0.28mm.
In the invention, the surface roughness of the inner surface of the stainless steel thin-wall pipe is preferably less than or equal to 1.6, and more preferably 0.8 to 1.6. The material of the stainless steel of the present invention is not particularly limited, and a stainless steel material known to those skilled in the art may be used. In the invention, the inner diameter of the stainless steel thin-wall pipe is preferably 2mm, and the outer diameter of the stainless steel thin-wall pipe is preferably 3mm.
In the present invention, the surface roughness of the outer surface of the inner core mold is preferably not more than 1.6, more preferably 0.8 to 1.6. In the present invention, the material of the inner core mold is preferably a tungsten-nickel-iron alloy. In the present invention, the chemical composition of the inconel preferably includes: w91-95 wt.%, ni 3.5-7 wt.%, and Fe 1.5-2 wt.%. In the present invention, the outer diameter of the inner core mold is preferably 1.98 to 1.99mm.
In the invention, the stainless steel thin-wall pipe and the inner core mould are preferably in tight fit.
After the stainless steel thin-wall pipe-inner core mould composite piece is obtained, metal hydride ceramic powder is filled around the stainless steel thin-wall pipe-inner core mould composite piece, and a blank piece is obtained through cold isostatic pressing.
In the present invention, the particle size of the metal hydride ceramic powder is preferably 0.15 to 0.425mm, specifically, 0.15 to 0.25mm or 0.18 to 0.425mm. In the present invention, the metal hydride preferably includes one or more of LiH, naH and KH.
In the present invention, the pressure of the cold isostatic press is preferably 100 to 180MPa, more preferably 110 to 170MPa; the dwell time is preferably 5 to 6min, more preferably 5.2 to 5.8min.
In the invention, the relative complete compactness of the metal hydride ceramic thin-wall tube under 100MPa is preferably more than or equal to 90 percent, and more preferably more than or equal to 90.5 percent; the relative complete density at 180MPa is preferably > 93%, more preferably > 93.5%.
Taking a containing container of metal hydride powder ceramic powder as an example of a soft die, fig. 1 is a schematic diagram of a method for compounding a metal hydride ceramic thin-wall tube and a stainless steel thin-wall tube provided by the invention. In the invention, metal hydride ceramic powder is filled around the stainless steel thin-wall pipe-inner core mould composite, and the cold isostatic pressing method preferably comprises the following steps:
filling metal hydride ceramic powder 3 at the bottom of a cavity of a soft die 9, putting a lower rubber interlayer 5, putting a stainless steel thin-wall pipe-inner core mould composite piece consisting of an inner core mould 1 and a stainless steel thin-wall pipe 2 into the central part of the soft die 1, wherein a buffer ring 4 is arranged at the connecting step of the stainless steel thin-wall pipe 2 and a flange plate, filling the metal hydride ceramic powder 3 around the stainless steel thin-wall pipe-inner core mould, and compacting; after the metal hydride ceramic powder 3 is flush with the upper end of the inner core mould 1, the upper rubber interlayer 8 is put in, a layer of metal hydride ceramic powder is filled on the surface of the upper rubber interlayer 8, the metal hydride ceramic powder is sealed and bundled by the rubber plug 7 and penetrates through the reserved exhaust tube 6 in the rubber plug 7, the sealed soft mould cavity is subjected to vacuum degassing by the exhaust tube 6, and then cold isostatic pressing is carried out.
In the invention, the air pressure in the soft mold cavity after vacuum degassing is preferably less than or equal to 20Pa.
After the blank piece is obtained, the blank piece is machined to form the metal hydride ceramic thin-walled tube, the inner core mould is removed, and the composite piece formed by compounding the metal hydride ceramic thin-walled tube and the stainless steel thin-walled tube is obtained.
In the present invention, the thickness of the metal hydride ceramic thin-walled tube is preferably 0.5mm.
In the present invention, the machining preferably includes rough machining and finish machining.
The invention is not particularly limited to said rough machining, subject to a rough machined part capable of obtaining a regular outer profile. In the present invention, the cushion ring is removed in the rough machining.
In the invention, the fine machining preferably turns the outer diameter of the rough machined part by taking the outer diameter of a flange plate at the lower end of the stainless steel thin-wall pipe as a reference. The present invention is not particularly limited to the turning, and the turning known to those skilled in the art may be employed.
After machining, the inner core mould is removed.
In order to further illustrate the present invention, the method for combining the metal hydride ceramic thin-walled tube and the stainless steel thin-walled tube according to the present invention is described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
Placing a polyvinyl chloride buffer ring with the thickness of 0.1mm at the connecting step of the stainless steel thin-walled tube with the inner diameter of 2mm, the outer diameter of 3mm and the surface roughness of 1.6 and a flange plate, inserting a tungsten-nickel-iron inner core mould with the outer diameter of 1.98mm and the surface roughness of 1.6 into the inner cavity of the stainless steel thin-walled tube, and ensuring that the inner core mould and the stainless steel thin-walled tube are tightly matched to obtain a stainless steel thin-walled tube-inner core mould composite part;
adopting metal hydride ceramic powder with the grain diameter of 0.15-0.425 mm, filling the metal hydride ceramic powder at the bottom of a soft die cavity, putting a lower rubber interlayer, and putting a stainless steel thin-wall tube-inner core die composite piece consisting of an inner core die and a stainless steel thin-wall tube into the central part of the soft die, wherein a buffer ring is arranged at the connecting step of the stainless steel thin-wall tube and a flange plate, filling the metal hydride ceramic powder at the periphery of the stainless steel thin-wall tube-inner core die, and compacting; after the metal hydride ceramic powder is flush with the upper end of the inner core mould, putting an upper rubber interlayer, filling a layer of metal hydride ceramic powder on the surface of the upper rubber interlayer, sealing and bundling the metal hydride ceramic powder through a rubber plug and penetrating a reserved exhaust tube in the rubber plug, carrying out vacuum degassing on a sealed soft mould cavity through the exhaust tube until the air pressure in the soft mould cavity is 10Pa, maintaining the pressure for 6min at 100MPa, carrying out cold isostatic pressing, and removing the soft mould, the upper rubber interlayer and the lower rubber interlayer to obtain a blank;
and (3) roughly machining the blank, turning the outer diameter of the obtained rough machined part by taking the outer diameter of a flange plate at the lower end of the stainless steel thin-walled tube as a reference to form a metal hydride ceramic thin-walled tube with the thickness of 0.5mm, and removing the inner core mould to obtain a composite part compounded by the metal hydride ceramic thin-walled tube and the stainless steel thin-walled tube.
Macroscopic observation is carried out on the composite of the metal hydride ceramic thin-wall tube and the stainless steel thin-wall tube obtained in the example 1, and a real object diagram of the composite of the metal hydride ceramic thin-wall tube and the stainless steel thin-wall tube obtained in the example 1 is shown in a figure 2. As can be seen from FIG. 2, the composite member provided by the present embodiment has no edge chipping or cracking.
The stainless steel straight bar with the outer diameter of 1.99mm is inserted into the stainless steel thin-wall pipe, and the stainless steel thin-wall pipe is free of obstacles when being inserted and pulled out, so that the stainless steel thin-wall pipe is stable and free of deformation.
Example 2
Placing a polyvinyl chloride buffer ring with the thickness of 0.3mm at the connecting step of the stainless steel thin-walled tube with the inner diameter of 2mm, the outer diameter of 3mm and the surface roughness of 0.8 and the flange plate, inserting a tungsten-nickel-iron inner core mould with the outer diameter of 1.98mm and the surface roughness of 0.8 into the inner cavity of the stainless steel thin-walled tube, and ensuring that the inner core mould and the stainless steel thin-walled tube are tightly matched to obtain a stainless steel thin-walled tube-inner core mould composite part;
adopting metal hydride ceramic powder with the grain diameter of 0.15-0.25 mm, filling the metal hydride ceramic powder at the bottom of a soft die cavity, putting a lower rubber interlayer, and putting a stainless steel thin-wall tube-inner core die composite piece consisting of an inner core die and a stainless steel thin-wall tube into the central part of the soft die, wherein a buffer ring is arranged at the connecting step of the stainless steel thin-wall tube and a flange plate, and filling the metal hydride ceramic powder around the stainless steel thin-wall tube-inner core die, and compacting; after the metal hydride ceramic powder is flush with the upper end of the inner core mould, putting an upper rubber interlayer, filling a layer of metal hydride ceramic powder on the surface of the upper rubber interlayer, sealing and bundling the metal hydride ceramic powder through a rubber plug and penetrating a reserved exhaust tube in the rubber plug, carrying out vacuum degassing on a sealed soft mould cavity through the exhaust tube until the air pressure in the soft mould cavity is 20Pa, maintaining the pressure for 5min at 180MPa, carrying out cold isostatic pressing, and removing the soft mould, the upper rubber interlayer and the lower rubber interlayer to obtain a blank;
and (3) roughly machining the blank, turning the outer diameter of the obtained rough machined part by taking the outer diameter of a flange plate at the lower end of the stainless steel thin-walled tube as a reference to form a metal hydride ceramic thin-walled tube with the thickness of 0.5mm, and removing the inner core mould to obtain a composite part compounded by the metal hydride ceramic thin-walled tube and the stainless steel thin-walled tube.
Macroscopic observation is carried out on the composite of the metal hydride ceramic thin-wall tube and the stainless steel thin-wall tube obtained in the example 2, and a real object diagram of the composite of the metal hydride ceramic thin-wall tube and the stainless steel thin-wall tube obtained in the example 2 is shown in figure 3. As can be seen from fig. 3, the composite member provided in this embodiment has no edge breakage or cracking, and the metal hydride ceramic thin-walled tube and the stainless steel thin-walled tube are well combined.
The stainless steel straight bar with the outer diameter of 1.99mm is inserted into the stainless steel thin-wall pipe, and no obstacle exists in insertion and extraction, which indicates that the stainless steel thin-wall pipe is stable and has no deformation.
Example 3
Placing a polycarbonate buffer ring with the thickness of 0.2mm at the connecting step of the stainless steel thin-walled tube with the inner diameter of 2mm, the outer diameter of 3mm and the surface roughness of 1.6 and a flange plate, inserting a tungsten-nickel-iron inner core mould with the outer diameter of 1.98mm and the surface roughness of 0.8 into the inner cavity of the stainless steel thin-walled tube, and ensuring that the inner core mould and the stainless steel thin-walled tube are tightly matched to obtain a stainless steel thin-walled tube-inner core mould composite part;
adopting metal hydride ceramic powder with the grain diameter of 0.18-0.425 mm, filling the metal hydride ceramic powder at the bottom of a soft die cavity, putting a lower rubber interlayer, and putting a stainless steel thin-wall tube-inner core die composite piece consisting of an inner core die and a stainless steel thin-wall tube into the central part of the soft die, wherein a buffer ring is arranged at the connecting step of the stainless steel thin-wall tube and a flange plate, filling the metal hydride ceramic powder at the periphery of the stainless steel thin-wall tube-inner core die, and compacting; after the metal hydride ceramic powder is flush with the upper end of the inner core mould, putting an upper rubber interlayer, filling a layer of metal hydride ceramic powder on the surface of the upper rubber interlayer, sealing and bundling the metal hydride ceramic powder through a rubber plug and penetrating a reserved exhaust tube in the rubber plug, carrying out vacuum degassing on a sealed soft mould cavity through the exhaust tube until the air pressure in the soft mould cavity is 20Pa, maintaining the pressure for 6min at 150MPa, carrying out cold isostatic pressing, and removing the soft mould, the upper rubber interlayer and the lower rubber interlayer to obtain a blank;
and (3) roughly machining the blank, turning the outer diameter of the obtained rough machined part by taking the outer diameter of a flange plate at the lower end of the stainless steel thin-walled tube as a reference to form a metal hydride ceramic thin-walled tube with the thickness of 0.5mm, and removing the inner core mould to obtain a composite part compounded by the metal hydride ceramic thin-walled tube and the stainless steel thin-walled tube.
Macroscopic observation is carried out on the composite of the metal hydride ceramic thin-wall tube and the stainless steel thin-wall tube obtained in the example 3, and a real object diagram of the composite of the metal hydride ceramic thin-wall tube and the stainless steel thin-wall tube obtained in the example 3 is shown in figure 4. As can be seen from fig. 4, the composite member provided by the present embodiment has no edge breakage or cracking, and the metal hydride ceramic thin-wall tube and the stainless steel thin-wall tube are well combined.
The stainless steel straight bar with the outer diameter of 1.99mm is inserted into the stainless steel thin-wall pipe, and no obstacle exists in insertion and extraction, which indicates that the stainless steel thin-wall pipe is stable and has no deformation.
The metal hydride ceramic thin-wall tube on the outer layer of the composite provided in example 1 was observed by a metallographic microscope, and the test chart is shown in fig. 5. As can be seen from FIG. 5, the grains of the metal hydride ceramic thin-wall tube are tightly combined, and no defects such as cracks are observed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for compounding a metal hydride ceramic thin-wall tube and a stainless steel thin-wall tube is characterized by comprising the following steps:
arranging a buffer ring at the connecting step of the stainless steel thin-wall pipe and the flange plate, and inserting an inner core mould matched with the stainless steel thin-wall pipe into the inner cavity of the stainless steel thin-wall pipe to obtain a stainless steel thin-wall pipe-inner core mould composite part;
filling metal hydride ceramic powder at the bottom of a cavity of the soft die, putting a lower rubber partition layer, and putting the stainless steel thin-wall tube-inner core mould composite piece into the central part of the soft die;
filling metal hydride ceramic powder around the stainless steel thin-walled tube-inner core mould composite, placing the metal hydride ceramic powder into an upper rubber interlayer after the metal hydride ceramic powder is flush with the upper end of the inner core mould, filling a layer of metal hydride ceramic powder on the surface of the upper rubber interlayer, sealing and bundling by using rubber plugs, penetrating a reserved exhaust tube in the rubber plugs to perform vacuum degassing on a sealed soft mould cavity, and performing cold isostatic pressing to obtain blank pieces;
and machining the blank to form the metal hydride ceramic thin-walled tube, and removing the inner core mould to obtain a composite piece formed by compounding the metal hydride ceramic thin-walled tube and the stainless steel thin-walled tube.
2. The method of claim 1, wherein the surface roughness of the inner surface of the stainless steel thin walled tube and the outer surface of the inner core mold is independently ≦ 1.6.
3. The method of claim 1, wherein the stainless steel thin walled tube is a tight fit with an inner core mold.
4. The method of claim 1 or 3, wherein the stainless steel thin walled tube has an inner diameter of 2mm and an outer diameter of 3mm;
the outer diameter of the inner core mould is 1.98-1.99 mm.
5. The method of claim 1, wherein the inner core mold is made of a tungsten-nickel-iron alloy.
6. The method of claim 1, wherein the cushion ring is made of polyvinyl chloride or polycarbonate; the thickness of the buffer ring is 0.1-0.3 mm.
7. The method of claim 1, wherein the metal hydride ceramic powder has a particle size of 0.15 to 0.425mm.
8. The method of claim 1, wherein the metal hydride ceramic thin walled tube has a thickness of 0.5mm;
the relative complete density of the metal hydride ceramic thin-wall tube under 100MPa is more than or equal to 90 percent, and the relative complete density under 180MPa is more than or equal to 93 percent.
9. The method of claim 1, wherein the cold isostatic pressing is performed at a pressure of 100 to 180MPa and a dwell time of 5 to 6min.
10. The method of claim 5, wherein the chemical composition of the sendust comprises: w91-95 wt.%, ni 3.5-7 wt.%, and Fe 1.5-2 wt.%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111559305.2A CN114227899B (en) | 2021-12-20 | 2021-12-20 | Method for compounding metal hydride ceramic thin-wall tube and stainless steel thin-wall tube |
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