CN113427201A - Shaft sleeve for nuclear power and preparation method thereof - Google Patents
Shaft sleeve for nuclear power and preparation method thereof Download PDFInfo
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- CN113427201A CN113427201A CN202010208896.8A CN202010208896A CN113427201A CN 113427201 A CN113427201 A CN 113427201A CN 202010208896 A CN202010208896 A CN 202010208896A CN 113427201 A CN113427201 A CN 113427201A
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- shaft sleeve
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- sheath
- nuclear power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
Abstract
The invention provides a shaft sleeve for nuclear power and a preparation method thereof, wherein the method comprises the following steps: treating the wall surface of the shaft sleeve substrate, and then putting the shaft sleeve substrate into a wrapping sleeve; wear-resistant powder is filled between the sheath and the wall surface of the shaft sleeve substrate, and then the sheath is subjected to sealing welding, degassing and heat preservation; carrying out diffusion bonding by adopting a hot isostatic pressing process; and removing the sheath and then performing finish machining to obtain the shaft sleeve for nuclear power. The nuclear power shaft sleeve prepared by the preparation method has the advantages that the wear-resistant layer is uniform in thickness, the crystal grains are fine and uniform in structure, and the wear-resistant layer and the base body are well metallurgically bonded.
Description
Technical Field
The invention relates to the technical field of canned motor pumps, in particular to a shaft sleeve for nuclear power and a preparation method thereof.
Background
The canned motor pump connects the pump and the motor together, the rotor of the motor and the impeller of the pump are fixed on the same shaft, the rotor of the motor and the stator are separated by the canned sleeve, the rotor runs in the conveyed medium, and the power is transmitted to the rotor through the magnetic field of the stator.
The shielding pump is provided with a layer of thin-wall shaft sleeve outside a rotor core and inside a stator core of the motor to isolate fluid conveyed by the pump, so that the rotor core and the stator core of the motor are protected from being washed and corroded by the fluid. As the shaft sleeve operates in a high-temperature and high-pressure cooling water environment, the shaft sleeve can be subjected to neutron radiation and alternating load during operation.
At present, a shaft sleeve is usually prepared by adopting a spray welding process, namely, in the process of preparing the shaft sleeve, a layer of powder with better spray welding performance, wear resistance and corrosion resistance is sprayed and welded on the surface of a shaft sleeve substrate by adopting the spray welding process, so that a spray welding layer is formed on the surface of the shaft sleeve substrate. However, the conventional spray welding layer not only has a relatively thick and uneven structure, but also has defects of loose structure, pores, inclusions, cracks and the like, and the good service performance of the spray welding layer is seriously influenced by the defects.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of a shaft sleeve for nuclear power, which solves the technical problems that a spray welding layer formed by spray welding is thick and uneven in structure, loose in structure, and has the defects of air holes, inclusions, cracks and the like in the spray welding process of the shaft sleeve prepared by adopting a spray welding process in the prior art.
The invention is realized by the following technical scheme:
the invention discloses a preparation method of a shaft sleeve for nuclear power, which comprises the following steps:
treating the wall surface of the shaft sleeve substrate, and then putting the shaft sleeve substrate into a wrapping sleeve;
wear-resistant powder is filled between the sheath and the wall surface of the shaft sleeve substrate, and then the sheath is subjected to degassing and heat preservation;
and a hot isostatic pressing process is adopted for diffusion connection, so that the wear-resistant powder forms a compact wear-resistant layer and is diffused with the shaft sleeve substrate, and metallurgical bonding is realized.
Further, the method specifically comprises the following steps:
s1: arranging an intermediate layer on the wall surface of the shaft sleeve substrate, which is in contact with the wear-resistant layer, so as to obtain a first shaft sleeve blank body;
s2: placing the first shaft sleeve blank body in a sheath, filling wear-resistant powder in a gap between the inner wall of the sheath and the interlayer layer of the first shaft sleeve blank body, then sealing the sheath, and degassing and insulating the interior of the sheath to obtain a second shaft sleeve blank body;
s3: performing diffusion connection treatment on the second shaft sleeve blank by adopting a hot isostatic pressing process, so that the wear-resistant powder forms a compact wear-resistant layer and is diffused with the shaft sleeve substrate to obtain a third shaft sleeve blank;
s4: and machining the third shaft sleeve blank to remove the sheath, and performing finish machining to obtain the shaft sleeve.
Further, the intermediate layer is made of nickel or nickel alloy in parts by weight.
Further, the sheath comprises an outer cylinder, an inner cylinder, an upper cover plate and a lower cover plate;
before the first shaft sleeve blank is placed in the sheath, the lower cover plate is placed in a gap between the bottom end of the outer cylinder and the bottom end of the inner cylinder, and the lower cover plate is welded with the bottom end of the outer cylinder and the bottom end of the inner cylinder respectively;
then, the first shaft sleeve blank body is placed between the outer cylinder body and the inner cylinder body, and the inner wall surface of the first shaft sleeve blank body is tightly attached to the outer wall surface of the inner cylinder body;
after the first shaft sleeve blank is placed in the sheath, the upper cover plate is placed in a gap between the top end of the outer cylinder and the top end of the inner cylinder, and the upper cover plate is welded with the top end of the outer cylinder and the top end of the inner cylinder respectively to seal the sheath.
Further, the upper cover plate is provided with a degassing hole, the degassing hole is connected with a vacuumizing device, and degassing and heat preservation are performed on the interior of the sheath after the sheath is sealed.
Further, the degassing hole is connected with the vacuumizing device through a vacuumizing pipe.
Further, after the upper cover plate is respectively welded with the top end of the outer cylinder and the top end of the inner cylinder, welded welding seams are detected, and if welding seam leakage points exist, repair welding is carried out on the welding seam leakage points or a sheath is replaced.
Further, the wear-resistant powder comprises the following components in percentage by weight: 1.5 to 1.7 percent of carbon, 30 to 32 percent of chromium, 9 to 11 percent of tungsten, 50 to 60 percent of cobalt, 0.4 to 1.5 percent of silicon, less than or equal to 1.0 percent of manganese and less than or equal to 0.25 percent of other inevitable impurities.
Furthermore, the hot isostatic pressing temperature is 1100-1180 ℃, and the pressure is 100-140 MPa.
Further, the wear-resistant powder comprises the following components in percentage by weight:
0.2 to 0.4 percent of carbon, 3.0 to 3.7 percent of silicon, 1.5 to 2.4 percent of boron, 6.5 to 7.7 percent of chromium, less than or equal to 7.8 percent of iron, 72.8 to 83.1 percent of nickel, and less than or equal to 0.2 percent of nitrogen and other inevitable impurities.
Furthermore, the hot isostatic pressing temperature is 900-980 ℃, and the pressure is 100-140 MPa.
Further, the wear-resistant powder comprises the following components in percentage by weight: 0.6 to 0.8 percent of carbon, 3.5 to 4.7 percent of silicon, 3.0 to 4.0 percent of boron, 15 to 17 percent of chromium, 3.5 to 5.0 percent of iron, 68.5 to 74 percent of nickel, and less than or equal to 0.2 percent of oxygen and other inevitable impurities.
Furthermore, the hot isostatic pressing temperature is 900-980 ℃, and the pressure is 100-140 MPa.
Further, when degassing and heat preservation are carried out, the vacuum degree in the package is controlled to be 2 x 10 < -3 > Pa, the heat preservation temperature is 380-460 ℃, and the heat preservation time is 2-48 hours.
The invention also provides a shaft sleeve for nuclear power, which comprises a shaft sleeve base body, a middle layer and a wear-resistant layer; the intermediate layer is applied on the shaft sleeve base body;
the wear-resistant layer is formed by wear-resistant powder between the sheath and the intermediate layer, and the wear-resistant layer is connected with the intermediate layer.
Further, the shaft sleeve is prepared by the preparation method.
Compared with the closest prior art, the technical scheme of the invention has the following beneficial effects:
the invention provides a preparation method of a shaft sleeve for nuclear power, which comprises the steps of treating the wall surface of a shaft sleeve substrate, specifically arranging an intermediate layer on the wall surface of the shaft sleeve substrate, which is in contact with a wear-resistant layer, and placing the intermediate layer into a jacket;
and then filling wear-resistant powder between the sheath and the wall surface of the shaft sleeve matrix, then degassing and insulating the sheath, specifically, after filling the wear-resistant powder in a gap between the inner wall of the sheath and the intermediate layer of the shaft sleeve matrix, sequentially adopting a sealed sheath, degassing and insulating the interior of the sheath, and carrying out hot isostatic pressing process treatment on the sheath to enable the wear-resistant powder to form a compact wear-resistant layer, and in the hot isostatic pressing process, carrying out mutual diffusion between the intermediate layer, the wear-resistant layer and the shaft sleeve matrix, and finally removing the sheath and carrying out finish machining, thereby preparing the shaft sleeve.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a connection structure of a sheath for placing a first sleeve substrate and an evacuation tube in an embodiment;
FIG. 2 is a microstructure diagram of a system shaft sleeve combined interface of a stainless steel shaft sleeve substrate and wear-resistant powder in scheme 3;
FIG. 3 is a microstructure diagram of a system shaft sleeve combined by a shaft sleeve base body made of N06600 material and wear-resistant powder in the scheme 2 at a combined interface;
FIG. 4 is a microstructure diagram of a system shaft sleeve combined by a shaft sleeve base body made of N06600 material and wear-resistant powder in the scheme 1 at a combined interface;
the shaft sleeve comprises a first shaft sleeve blank body, 2-wear-resistant powder, 3-an outer cylinder body, 4-an inner cylinder body, 5-an upper cover plate, 6-a lower cover plate, 7-a degassing hole and 8-a vacuumizing tube.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The preparation method of the shaft sleeve for nuclear power provided by the embodiment comprises the following steps:
s1: preparing a shaft sleeve substrate, and then processing the obtained shaft sleeve substrate to a required size;
after a shaft sleeve base body with the required size is obtained, applying an intermediate layer on the surface of the shaft sleeve base body to obtain a first shaft sleeve blank body; specifically, an intermediate layer is applied to the surface of the shaft sleeve substrate by adopting the processes of electroplating, plasma spraying, physical vapor deposition and the like, and further, the electroplating process, the plasma spraying process or the physical vapor deposition process is correspondingly selected according to different requirements of the intermediate layer such as material, thickness and the like, and the electroplating or the plasma spraying process is preferably adopted due to the higher cost of the physical vapor deposition process;
the material of the middle layer can be nickel or nickel alloy, and the middle layer has the function that when the wear-resistant layer is arranged on the surface of the shaft sleeve substrate, the surface of the shaft sleeve substrate can permeate the middle layer and the wear-resistant layer to perform mutual permeation or diffusion, so that the interface stress of the shaft sleeve substrate and the wear-resistant layer on a contact surface can be reduced conveniently;
the material for preparing the shaft sleeve substrate can be N06600, 0Cr18Ni10Ti, 022Cr19Ni10, 347 stainless steel and 45 steel materials, but is not limited to the above materials, and can be selected by a person skilled in the art according to actual needs;
s2: as shown in fig. 1, a first shaft sleeve blank 1 is placed in a sheath, wear-resistant powder 2 is filled in a gap between the inner wall of the sheath and the surface of an intermediate layer (not shown in the figure) of the first shaft sleeve blank 1, the sheath is sealed, and then the interior of the sheath is degassed and insulated to obtain a second shaft sleeve blank;
the specific operation method comprises the following steps:
s2-1, preparing and building a sheath, wherein the building components of the sheath specifically comprise an outer barrel 3, an inner barrel 4, an upper cover plate 5 and a lower cover plate 6;
the outer cylinder body 3 and the inner cylinder body 4 are both in a cylindrical shape, the upper cover plate 5 and the lower cover plate 6 adopt circular ring structures, the radius of the outer cylinder body 3 is larger than that of the inner cylinder body 4, and the upper cover plate 5 is provided with a degassing hole 7;
the radius difference between the inner ring and the outer ring of the lower cover plate 6 is equal to the radius difference between the outer cylinder 3 and the inner cylinder 4;
the radius difference between the inner ring and the outer ring of the upper cover plate 5 is equal to the radius difference between the outer cylinder 3 and the inner cylinder 4;
before the first shaft sleeve blank 1 is placed in the sleeve, the inner cylinder body 4 is placed in the outer cylinder body 3, then the lower cover plate 6 is placed between the bottom end of the inner cylinder body 4 and the bottom end of the outer cylinder body 3, the edge of an inner circular ring of the lower cover plate 6 is welded with the edge of an outer circular ring of the bottom end of the inner cylinder body 4, and the edge of an outer circular ring of the lower cover plate 6 is welded with the edge of an inner circular ring of the bottom end of the outer cylinder body 3.
S2-2, placing the first sleeve blank 1 in the gap between the outer cylinder 3 and the inner cylinder 4, specifically, making the inner wall surface of the first sleeve blank 1 closely contact with the outer wall surface of the inner cylinder 4, and making a certain gap between the middle layer of the first sleeve blank 1 and the inner wall surface of the outer cylinder 3.
S2-3, filling the wear-resistant powder 3 in the gap between the inner wall of the outer cylinder 3 and the interlayer layer of the first shaft sleeve blank 1, controlling the granularity of the wear-resistant powder 3 to be less than 180 microns, and adopts a vibration measure in the filling process, after the wear-resistant powder 3 is filled, the upper cover plate 5 is placed in the gap between the top end of the outer cylinder 3 and the top end of the inner cylinder 4, and the bottom surface of the upper cover plate 5 is contacted with the top end surface of the first shaft sleeve blank 1 and the abrasion-resistant powder 2 between the inner wall of the outer cylinder 3 and the layer surface of the middle layer of the outer wall of the first shaft sleeve base body 1, then welding the edge of the inner circular ring of the upper cover plate 5 with the edge of the outer circular ring at the top end of the inner cylinder 4, welding the edge of the outer circular ring of the upper cover plate 5 with the edge of the inner circular ring at the top end of the outer cylinder 3, sealing the sheath, degassing and preserving heat inside the sheath, and obtaining a second sheath blank;
for the wear resistant powder, the following three options can be selected:
scheme 1:
the wear-resistant powder comprises the following components in percentage by weight: 1.5 to 1.7 percent of carbon, 30 to 32 percent of chromium, 9 to 11 percent of tungsten, 50 to 60 percent of cobalt, 0.4 to 1.5 percent of silicon, less than or equal to 1.0 percent of manganese and less than or equal to 0.25 percent of other inevitable impurities;
preferably, the wear-resistant powder comprises the following components in percentage by weight: 1.65 to 1.7 percent of carbon, 31.5 to 32 percent of chromium, 10 to 11 percent of tungsten, 54 to 60 percent of cobalt, 0.7 to 1.5 percent of silicon, less than or equal to 1.0 percent of manganese and less than or equal to 0.25 percent of other inevitable impurities;
scheme 2:
the wear-resistant powder comprises the following components in percentage by weight: 0.2 to 0.4 percent of carbon, 3.0 to 3.7 percent of silicon, 1.5 to 2.4 percent of boron, 6.5 to 7.7 percent of chromium, less than or equal to 7.8 percent of iron, 72.8 to 83.1 percent of nickel, less than or equal to 0.1 percent of nitrogen and less than or equal to 0.2 percent of other inevitable impurities;
preferably, the wear-resistant powder comprises the following components in percentage by weight: 0.2 to 0.3 percent of carbon, 3.5 to 3.7 percent of silicon, 1.5 to 2 percent of boron, 7 to 7.5 percent of chromium, less than or equal to 6 percent of iron, 75 to 80 percent of nickel, less than or equal to 0.1 percent of nitrogen and less than or equal to 0.2 percent of other inevitable impurities;
scheme 3:
the wear-resistant powder comprises the following components in percentage by weight: 0.6 to 0.8 percent of carbon, 3.5 to 4.7 percent of silicon, 3.0 to 4.0 percent of boron, 15 to 17 percent of chromium, 3.5 to 5.0 percent of iron, 68.5 to 74 percent of nickel, less than or equal to 0.05 percent of oxygen and less than or equal to 0.2 percent of other inevitable impurities;
preferably, the wear-resistant powder comprises the following components in percentage by weight: 0.67 to 0.7 percent of carbon, 4 to 4.5 percent of silicon, 3.3 to 3.8 percent of boron, 16 to 17 percent of chromium, 4 to 4.5 percent of iron, 70 to 72 percent of nickel, less than or equal to 0.05 percent of oxygen and less than or equal to 0.2 percent of other inevitable impurities;
the degassing and heat preservation method specifically comprises the following steps: connecting the degassing hole 7 on the upper cover plate 5 with a vacuumizing device, specifically, connecting the degassing hole 7 on the upper cover plate 5 with the vacuumizing device through a vacuumizing tube 8, vacuumizing the sheath by the vacuumizing device through the vacuumizing tube 8, and controlling the vacuum degree in the sheath to be 2 x 10-3Pa, the heat preservation temperature is 380-460 ℃, and the heat preservation time is 2-48 hours;
the degassing and heat preservation functions mainly aim to ensure that residual gas and volatile substances do not exist in the sheath, on one hand, the purity of the wear-resistant powder in the sheath is ensured, the defect that harmful phases are generated between the residual gas and the volatile substances in the sheath and the wear-resistant powder at high temperature in the subsequent hot isostatic pressing process to reduce the performance of products is avoided, and on the other hand, the problem that the sheath is cracked and the products are directly scrapped due to the fact that the sheath is heated and expanded under the high-temperature state in the hot isostatic pressing process is avoided;
because the subsequent hot isostatic pressing process is a high-temperature and high-pressure process, generally Ar gas is used as a conducting medium, if a weld leakage point exists in the sheath in the welding process, the weld leakage point can further crack under the conditions of high temperature and high pressure in the hot isostatic pressing process, so that Ar gas enters the sheath and is filled in the wear-resistant powder and between the wear-resistant powder and the shaft sleeve substrate, the high-pressure compression densification effect cannot be achieved, and the product can be scrapped, therefore, after the upper cover plate 5 is respectively welded with the top end of the outer cylinder 3 and the top end of the inner cylinder 4, the welded weld is preferably detected, if the weld leakage point exists, the weld leakage point is subjected to repair welding or sheath replacement, and specifically, a helium mass spectrometer is used for detecting the weld of the edge of the outer ring of the upper cover plate 5 and the edge of the inner ring of the top end of the outer cylinder 3, and detecting the weld of the edge of the inner ring of the upper cover plate 3 and the edge of the outer ring of the top end of the inner cylinder 4, if the parts have weld leakage points, the weld leakage points of the corresponding parts are subjected to supplementary welding or the capsule is newly manufactured, so that the problems in the hot isostatic pressing process are avoided.
S3: performing diffusion connection treatment on the second shaft sleeve blank by adopting a hot isostatic pressing process, so that the wear-resistant powder forms a wear-resistant layer between the inner wall of the outer cylinder and the intermediate layer, controlling the wear-resistant layer to reach corresponding hardness, and performing mutual diffusion between the intermediate layer and the wear-resistant layer as well as between the intermediate layer and the shaft sleeve substrate in the hot isostatic pressing process to obtain a third shaft sleeve blank;
if the wear-resistant powder adopts the scheme 1, the hot isostatic pressing temperature is controlled to be within 1100-1180 ℃, the pressure is controlled to be 100-140 MPa, and the heat preservation time is determined according to the shape and the specification and the size of the product; controlling the hardness of the wear-resistant layer to be more than or equal to 52 HRC;
if the wear-resistant powder adopts the scheme 2, the hot isostatic pressing temperature is controlled to be within 900-980 ℃, the pressure is controlled to be 100-140 MPa, and the heat preservation time is determined according to the shape and the specification size of the product; controlling the hardness of the wear-resistant layer to be more than or equal to 48 HRC;
if the wear-resistant powder adopts the scheme 3, the hot isostatic pressing temperature is controlled to be within 900-980 ℃, the pressure is controlled to be 100-140 MPa, and the heat preservation time is determined according to the shape and the specification size of the product; the hardness of the wear-resistant layer is controlled to be more than or equal to 60 HRC.
S4: and removing the outer sheath of the third shaft sleeve blank, specifically, removing the outer sheath of the third shaft sleeve blank by adopting a machining or acid pickling method, and then carrying out finish machining on the third shaft sleeve blank, wherein the finish machining generally comprises the working procedures of finish turning, finish grinding and the like so as to reach the size, form and position tolerance and surface roughness required by the drawing, and then obtaining the finished shaft sleeve.
The embodiment also provides a shaft sleeve for nuclear power, which comprises a shaft sleeve base body, a middle layer and a wear-resistant layer; the middle layer is applied on the shaft sleeve base body;
the wear-resistant layer is formed by wear-resistant powder between the sheath and the intermediate layer and is connected with the intermediate layer;
preferably, the shaft sleeve is prepared by the preparation method.
The following table shows the interfacial bond strengths of the sleeve substrates using different materials in combination with the wear resistant powders of schemes 1-3 above:
TABLE 1
As can be seen from table 1: the bonding strength of each shaft sleeve matrix and the corresponding wear-resistant powder reaches 410MPa to 510MPa, and it can be seen that each shaft sleeve matrix and the corresponding wear-resistant powder realize good bonding, because the intermediate layer is arranged on the wall surface of the shaft sleeve matrix, which is in contact with the wear-resistant layer formed by the wear-resistant powder, and the intermediate layer, the wear-resistant layer and the shaft sleeve matrix are mutually diffused in the hot isostatic pressing process.
Fig. 2 is a microstructure diagram of a system shaft sleeve combined interface of a stainless steel shaft sleeve base body and the wear-resistant powder in the scheme 3, and can be seen from the diagram: scheme 3 the wear-resistant powder is completely compact, the wear-resistant layer has a fine and uniform alloy structure and is uniformly distributed, the wear-resistant powder layer and the stainless steel shaft sleeve substrate realize good metallurgical bonding, and an obvious diffusion area is formed.
Fig. 3 is a microstructure diagram of a system sleeve of a sleeve base body made of N06600 material and wear-resistant powder in the scheme 2, wherein the system sleeve is combined with a combination interface, and the microstructure diagram can be seen: scheme 2 the wear-resistant powder is completely compact and has fine structure and uniform distribution, the wear-resistant powder layer and the N06600 shaft sleeve base body realize good metallurgical bonding, and an obvious diffusion area is formed.
Fig. 4 is a microstructure diagram of a system sleeve of a sleeve base body made of N06600 material and wear-resistant powder in the scheme 1, wherein the system sleeve is combined with a combination interface, and the microstructure diagram can be seen: the wear-resistant powder in the scheme 1 is completely compact, fine in structure and uniform in distribution, the wear-resistant powder layer and the N06600 shaft sleeve base body achieve good metallurgical bonding, and an obvious diffusion area is formed.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (16)
1. A preparation method of a shaft sleeve for nuclear power is characterized by comprising the following steps:
treating the wall surface of the shaft sleeve substrate, and then putting the shaft sleeve substrate into a wrapping sleeve;
wear-resistant powder is filled between the sheath and the wall surface of the shaft sleeve substrate, and then the sheath is subjected to degassing and heat preservation;
and a hot isostatic pressing process is adopted for diffusion connection, so that the wear-resistant powder forms a compact wear-resistant layer and is diffused with the shaft sleeve substrate, and metallurgical bonding is realized.
2. The preparation method of the shaft sleeve for nuclear power, according to claim 1, is characterized by comprising the following steps:
s1: arranging an intermediate layer on the wall surface of the shaft sleeve substrate, which is in contact with the wear-resistant layer, so as to obtain a first shaft sleeve blank body;
s2: placing the first shaft sleeve blank body in a sheath, filling wear-resistant powder in a gap between the inner wall of the sheath and the interlayer layer of the first shaft sleeve blank body, then sealing the sheath, and degassing and insulating the interior of the sheath to obtain a second shaft sleeve blank body;
s3: performing diffusion connection treatment on the second shaft sleeve blank by adopting a hot isostatic pressing process, so that the wear-resistant powder forms a compact wear-resistant layer and is diffused with the shaft sleeve substrate to obtain a third shaft sleeve blank;
s4: and removing the sheath of the third shaft sleeve blank by machining, and performing finish machining to obtain the shaft sleeve.
3. The method for preparing a shaft sleeve for nuclear power as claimed in claim 1, wherein the intermediate layer is made of nickel or nickel alloy in parts by weight.
4. The method for preparing a shaft sleeve for nuclear power as claimed in claim 1, wherein the sheath comprises an outer cylinder, an inner cylinder, an upper cover plate and a lower cover plate;
before the first shaft sleeve blank is placed in the sheath, the lower cover plate is placed in a gap between the bottom end of the outer cylinder and the bottom end of the inner cylinder, and the lower cover plate is welded with the bottom end of the outer cylinder and the bottom end of the inner cylinder respectively;
then, the first shaft sleeve blank body is placed between the outer cylinder body and the inner cylinder body, and the inner wall surface of the first shaft sleeve blank body is tightly attached to the outer wall surface of the inner cylinder body;
after the first shaft sleeve blank is placed in the sheath, the upper cover plate is placed in a gap between the top end of the outer cylinder and the top end of the inner cylinder, and the upper cover plate is welded with the top end of the outer cylinder and the top end of the inner cylinder respectively to seal the sheath.
5. The manufacturing method of the shaft sleeve for nuclear power as claimed in claim 4, wherein the upper cover plate is provided with a degassing hole, the degassing hole is connected with a vacuum pumping device, and degassing and heat preservation are performed on the interior of the sheath after the sheath is sealed.
6. The method for manufacturing a shaft sleeve for nuclear power as claimed in claim 5, wherein the degassing hole is connected with the vacuum-pumping device through a vacuum-pumping pipe.
7. The manufacturing method of the shaft sleeve for nuclear power as claimed in claim 4, wherein after the upper cover plate is welded to the top end of the outer cylinder and the top end of the inner cylinder respectively, the welded seam is detected, and if the seam leakage exists, the seam leakage is subjected to repair welding or sheath replacement.
8. The preparation method of the shaft sleeve for nuclear power as claimed in claim 1, wherein the wear-resistant powder comprises the following components in percentage by weight: 1.5 to 1.7 percent of carbon, 30 to 32 percent of chromium, 9 to 11 percent of tungsten, 50 to 60 percent of cobalt, 0.4 to 1.5 percent of silicon, less than or equal to 1.0 percent of manganese and less than or equal to 0.25 percent of other inevitable impurities.
9. The method for preparing the nuclear power bushing according to claim 8, wherein the hot isostatic pressing is performed at 1100-1180 ℃ and 100-140 MPa.
10. The preparation method of the shaft sleeve for nuclear power as claimed in claim 1, wherein the wear-resistant powder comprises the following components in percentage by weight:
0.2 to 0.4 percent of carbon, 3.0 to 3.7 percent of silicon, 1.5 to 2.4 percent of boron, 6.5 to 7.7 percent of chromium, less than or equal to 7.8 percent of iron, 72.8 to 83.1 percent of nickel, and less than or equal to 0.2 percent of nitrogen and other inevitable impurities.
11. The method for preparing a nuclear power bushing according to claim 10, wherein the hot isostatic pressing is performed at 900-980 ℃ and at 100-140 MPa.
12. The preparation method of the shaft sleeve for nuclear power as claimed in claim 1, wherein the wear-resistant powder comprises the following components in percentage by weight: 0.6 to 0.8 percent of carbon, 3.5 to 4.7 percent of silicon, 3.0 to 4.0 percent of boron, 15 to 17 percent of chromium, 3.5 to 5.0 percent of iron, 68.5 to 74 percent of nickel, and less than or equal to 0.2 percent of oxygen and other inevitable impurities.
13. The method for preparing a nuclear power bushing according to claim 12, wherein the hot isostatic pressing is performed at 900-980 ℃ and at 100-140 MPa.
14. The method for preparing a nuclear power shaft sleeve according to claim 1, wherein the degassing and heat preservation are performed while controlling the degassing and heat preservationThe vacuum degree in the ladle is 2 multiplied by 10-3Pa, the heat preservation temperature is 380-460 ℃, and the heat preservation time is 2-48 hours.
15. The shaft sleeve for nuclear power is characterized by comprising a shaft sleeve base body, a middle layer and a wear-resistant layer; the intermediate layer is applied on the shaft sleeve base body;
the wear-resistant layer is formed by wear-resistant powder between the sheath and the intermediate layer, and the wear-resistant layer is connected with the intermediate layer.
16. The shaft sleeve for nuclear power according to claim 15, characterized in that the shaft sleeve is manufactured by the manufacturing method of any one of claims 1 to 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010208896.8A CN113427201A (en) | 2020-03-23 | 2020-03-23 | Shaft sleeve for nuclear power and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010208896.8A CN113427201A (en) | 2020-03-23 | 2020-03-23 | Shaft sleeve for nuclear power and preparation method thereof |
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