CN115971599B - Brazing method for improving connection strength of large-capacity rotary target disc for CT bulb tube - Google Patents
Brazing method for improving connection strength of large-capacity rotary target disc for CT bulb tube Download PDFInfo
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Abstract
The invention discloses a brazing method for improving the connection strength of a large-capacity rotary target disk for a CT bulb tube, which is manufactured by a WRe/TZM alloy target disk and a graphite target disk through the brazing method, and specifically comprises the following steps: (1) Processing a ring slot on the TZM surface of the WRe/TZM alloy target disc; (2) machining a ring-shaped slot on the surface to be brazed of the graphite target disk; (3) processing annular protrusions on the two side surfaces of the brazing material sheet; (4) Cleaning and degassing a WRe/TZM alloy target disc, a brazing material sheet and a graphite target disc, and sequentially stacking the WRe/TZM alloy target disc, the brazing material sheet and the graphite target disc in a furnace chamber of a vacuum brazing furnace from top to bottom; (5) Firstly heating to a first brazing temperature, preserving heat, and then cooling and preserving heat; then heating to a second brazing temperature and preserving heat; (6) taking out the WRe/TZM/graphite target disc. The invention improves the connection strength of the WRe/TZM alloy target disk and the graphite target disk, and reduces the defects of cold joint and partial desoldering of the WRe/TZM alloy target disk and the graphite target disk, thereby improving the brazing yield of the large-capacity rotary target disk for the CT bulb tube.
Description
Technical Field
The invention relates to the technical field of manufacturing of high-capacity rotary target discs for CT bulb tubes, in particular to a brazing method for improving the connection strength of the high-capacity rotary target discs for CT bulb tubes.
Background
The large-capacity rotary target disk for the CT bulb tube is a WRe/TZM/graphite target disk, and a braze welding method is generally adopted to connect the WRe/TZM alloy target disk for generating rays with the graphite target disk mainly used for radiating the WRe/TZM alloy target disk, so that a composite structure of the WRe/TZM alloy target disk and the graphite target disk is formed.
In the existing brazing technology of the WRe/TZM/graphite target disc, before the target disc is brazed, triangular grooves or rectangular grooves are usually processed on the surface to be brazed of the graphite layer and the TZM surface of the WRe/TZM alloy target disc, so that the welding strength of the WRe/TZM alloy target disc and the graphite target disc is improved.
Specifically, a single triangular groove or rectangular groove is processed on the brazing surface of the graphite layer, then a WRe/TZM alloy target disc, brazing material and the graphite target disc are stacked in a vacuum brazing furnace in sequence, the temperature is increased to the brazing temperature, the heat is preserved for a certain time, and then the brazing is completed after cooling to the room temperature.
Although the method can effectively improve the welding strength of the gold WRe/TZM alloy target disk and the graphite target disk, the situation that when the process is controlled improperly, the brazing layer of the WRe/TZM alloy target disk and the graphite target disk is subjected to large-area cold joint and off-joint exists, and when serious, the WRe/TZM alloy target disk and the graphite target disk are separated. Therefore, there is a certain fraction of defective in the production process of the target disk. Meanwhile, partial defective products with defects can be assembled into the bulb tube of the CT machine, so that the bulb tube fails in advance and quality accidents are caused.
The reason for this is: by adopting a single groove-shaped structure, although the method is relatively simple in the pre-processing process before brazing, tiny fluctuation exists inevitably in the temperature in a vacuum brazing furnace during brazing, so that uneven flow of brazing material still exists; furthermore, the surface of the WRe/TZM alloy target disk and the surface of the graphite target disk still have defects such as uneven flatness and local micro pits compared with ideal machining precision. Therefore, there is a certain qualification rate of the target disk brazing, but some target disks have defects of cold joint and partial desoldering.
Disclosure of Invention
The invention aims to overcome the defects and the shortcomings in the prior art, and provides a brazing method for improving the connection strength of a large-capacity rotary target disc for a CT bulb tube, which can reliably connect a WRe/TZM alloy target disc with a graphite target disc so as to improve the connection strength of the WRe/TZM alloy target disc and the graphite target disc.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a brazing method for improving the connection strength of a large-capacity rotary target disc for a CT bulb tube is characterized by comprising the following steps of: the method specifically comprises the following steps:
s1, processing a ring slot from the outer edge of the WRe/TZM alloy target disc to the center of the TZM surface of the WRe/TZM alloy target disc at certain intervals, wherein an inverted trapezoid ring slot is processed on the outermost ring, then two triangle ring slots are processed, then an inverted trapezoid ring slot is processed, then two triangle ring slots are processed, and so on;
s2, processing a ring slot at a certain distance from the outer edge of the graphite target disk to the center of the surface to be brazed of the graphite target disk, wherein a rectangular ring slot is processed at the outermost ring, two triangular ring slots are processed, a rectangular ring slot is processed, two triangular ring slots are processed, and the like;
s3, processing rectangular annular bulges on the surfaces of two sides of the brazing sheet respectively at positions corresponding to the inverted trapezoid annular slot on the TZM surface of the WRe/TZM alloy target disc and the rectangular annular slot on the surface to be brazed of the graphite target disc; processing triangular annular protrusions on the two side surfaces of the brazing material sheet at positions corresponding to the triangular annular slots;
s4, cleaning and degassing the processed WRe/TZM alloy target disc, the brazing material sheet and the graphite target disc, and sequentially stacking the WRe/TZM alloy target disc, the brazing material sheet and the graphite target disc in a furnace chamber of a vacuum brazing furnace from top to bottom;
s5, when the vacuum degree of the vacuum brazing furnace reaches 5 multiplied by 10 -2 After Pa, heating to a first brazing temperature, namely heating to 1500-1600 ℃, preserving heat for 30-90min, cooling to about 1000 ℃, and preserving heat for 100-120min; then heating to a second brazing temperature, and preserving heat for 30-90min, wherein the second brazing temperature is 10-20 ℃ lower than the first brazing temperature;
s6, after brazing is finished, cooling along with the furnace, and taking out the WRe/TZM/graphite target disc.
Further, in the steps S1 and S2, the interval between two adjacent annular slots on the same target plate is 2mm.
Further, in the steps S1 and S2, a numerically controlled lathe or a numerically controlled milling machine is used, and a profiling tool matched with the structures of the inverted trapezoid annular slot, the rectangular annular slot and the triangular annular slot is used for machining each annular slot.
Further, in the steps S1 and S2, the long bottom edge of each inverted trapezoid annular slot is 0.2-0.8mm, the short bottom edge is 0.15-0.7mm, and the two oblique edges are 0.1-0.5mm; the long side size of each rectangular annular slot is 0.15-0.7mm, and the short side size is 0.1-0.5mm; the two sides of each triangular annular slot are 0.1-0.5mm, and the included angle of the two sides is 30-60 degrees.
Further, in the step S3, a numerically controlled lathe or a numerically controlled milling machine is adopted, and a profiling cutter matched with the structure of the annular protrusions is adopted to process each annular protrusion.
Further, in the step S3, the size of each annular protrusion is smaller than the corresponding inverted trapezoid annular slot, rectangular annular slot and triangular annular slot by 0.05mm.
In step S4, before brazing, ultrasonic cleaning is adopted to remove oil stains and dust on the surfaces of the WRe/TZM alloy target disc, the brazing material sheet and the graphite target disc.
Further, in the step S4, before brazing, the cleaned WRe/TZM alloy target plate, the brazing material sheet and the graphite target plate are degassed to remove low melting point impurities on the surfaces of the WRe/TZM alloy target plate, the brazing material sheet and the graphite target plate.
Further, the method for degassing comprises the following steps: feeding the cleaned WRe/TZM alloy target disk, brazing material sheet and graphite target disk into vacuum degassing furnace, vacuum degree is superior to 5×10 -3 Pa, degassing temperature of 1000-1500 ℃ and degassing time of 0.5-5 h.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts an improved annular slot structure, improves the arrangement mode of annular slots, adopts a vacuum brazing process of secondary remelting of brazing material, improves the connection strength of the WRe/TZM alloy target disk and the graphite target disk, and reduces the defects of cold joint and partial desoldering of the WRe/TZM alloy target disk and the graphite target disk, thereby improving the brazing yield of the large-capacity rotary target disk for the CT bulb tube.
Drawings
FIG. 1 is a schematic diagram of the structure of a WRe/TZM alloy target disk, braze, and graphite target disk of the present invention.
Fig. 2 is a temperature profile of vacuum brazing in accordance with the present invention, wherein t1=1400-1800 ℃, t1-t2=10-20 ℃; heating rate: < 10 ℃/min; cooling speed: cooling along with the furnace.
FIG. 3 is a schematic structural diagram of a WRe/TZM/graphite target disk fabricated using the brazing method of the present invention.
FIG. 4 is a test interface image obtained by ultrasonic testing of a WRe/TZM/graphite target disk manufactured by the brazing method of the present invention.
FIG. 5 is a test interface image obtained by ultrasonic testing of a WRe/TZM/graphite target disk fabricated using a prior art brazing process.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, a brazing method for improving the connection strength of a large-capacity rotary target disc for a CT bulb tube specifically comprises the following steps:
step one, processing an annular slot from the outer edge of the WRe/TZM alloy target disc 1 to the center of the TZM surface of the WRe/TZM alloy target disc 1 every 2mm, wherein an inverted trapezoid annular slot 4 is processed on the outermost ring, two triangular annular slots 5 are processed, an inverted trapezoid annular slot 4 is processed, two triangular annular slots 5 are processed, and the like.
Specifically, a numerical control lathe or a numerical control milling machine is adopted, and a profiling cutter matched with the structures of the inverted trapezoid annular slot 4 and the triangular annular slot 5 is adopted to process each annular slot.
Wherein, the long bottom edge of each inverted trapezoid annular slot 4 is 0.8mm, the short bottom edge is 0.4mm, and the two bevel edges are 0.3mm; the two sides of the triangular annular slots 5 are 0.3mm, and the included angles of the two sides are 30 degrees.
It should be noted that, the above-mentioned limitation of processing a ring slot every 2mm makes the number of ring slots enough, so that the bonding strength of the brazing layer 11 can be ensured, and the processing difficulty of the ring slots is reduced.
In addition, in order to improve the bonding strength of the brazing layer 11, the above-described annular slit 4 defining an inverted trapezoid shape, i.e., the front opening is small and the rear opening is large, whereby the brazing material is not easily removed, the brazing effect is increased, and the bonding strength is improved.
In addition, since the machining difficulty is increased and the cost is increased by using the inverted trapezoidal annular slots entirely, the annular slots defining one inverted trapezoid and the two triangular annular slots are alternately arranged from the outer edge to the center.
The following is the same.
Step two, processing a ring slot every 2mm from the outer edge to the center of the graphite target disk 3 on the surface to be brazed of the graphite target disk 3, wherein a rectangular ring slot 6 is processed on the outermost ring, two triangular ring slots 7 are processed, a rectangular ring slot 6 is processed, two triangular ring slots 7 are processed, and so on.
Specifically, a numerical control lathe or a numerical control milling machine is adopted, and a profiling cutter matched with the structures of the rectangular annular slot 6 and the triangular annular slot 7 is adopted to process each annular slot.
Wherein, the long side size of each rectangular annular slot 6 is 0.4mm, and the short side size is 0.3mm; the two sides of the triangular annular slots 7 are 0.3mm, and the included angles of the two sides are 30 degrees.
It should be noted that, because of the brittleness of the mechanical properties of graphite, it is very difficult to machine an inverted trapezoidal annular slot on the surface to be brazed of a graphite target disk, and therefore, this step defines a method feature of machining a rectangular annular slot on the surface to be brazed of a graphite target disk.
And thirdly, respectively processing annular bulges which are matched with the structures of annular slots on the TZM surface of the WRe/TZM alloy target disc 1 and the surface to be brazed of the graphite target disc 3 and correspond to the positions on the two side surfaces of the brazing material sheet 2.
Specifically, rectangular annular protrusions 8 are processed correspondingly at positions corresponding to the inverted trapezoid annular slots 4 on the TZM surface of the WRe/TZM alloy target disc 1 and the rectangular annular slots 6 on the surface to be brazed of the graphite target disc 3 respectively; triangular annular protrusions 9 are machined on both side surfaces of the brazing material sheet 2 at positions corresponding to the triangular annular slots 5, 7.
Wherein, the size of each annular bulge is smaller than the corresponding reverse trapezoid annular slot, rectangular annular slot and triangular annular slot by 0.05mm.
Further, the long side size of each rectangular annular protrusion 8 is 0.35mm, and the short side size is 0.25mm; the two sides of each triangular annular bulge 9 are 0.25mm in length, and the included angles of the two sides are 30 degrees.
More specifically, a numerical control lathe or a numerical control milling machine is adopted, and a profiling cutter matched with the structures of the rectangular annular bulge 8 and the triangular annular bulge 9 is adopted to process each annular bulge.
And fourthly, cleaning and degassing the processed WRe/TZM alloy target disc, the brazing material sheet and the graphite target disc, and sequentially stacking the materials in a furnace chamber of a vacuum brazing furnace from top to bottom.
Specifically, before brazing, ultrasonic cleaning is adopted to remove oil stain, dust and other surface impurities on the surfaces of the WRe/TZM alloy target disc 1, the brazing material sheet 2 and the graphite target disc 3, so as to improve the bonding quality between the WRe/TZM alloy target disc 1 and the graphite target disc 3 after brazing.
Before brazing, the cleaned write/TZM alloy target disk 1, brazing material sheet 2 and graphite target disk 3 are degassed to remove low melting point impurities on the surfaces of the write/TZM alloy target disk 1, brazing material sheet 2 and graphite target disk 3.
More specifically, the cleaned WRe/TZM alloy target plate 1, the brazing material sheet 2 and the graphite target plate 3 are sent into a vacuum degassing furnace, and the vacuum degree of the vacuum degassing furnace is kept to be better than 5 multiplied by 10 -3 Pa, degassing temperature of 1200 ℃ and degassing time of 2h.
Fifthly, when the vacuum degree of the vacuum brazing furnace reaches 5 multiplied by 10 -2 After Pa (so that oxidation of the brazing material sheet 2 can be avoided), in order to fully melt the WRe/TZM alloy and the brazing material sheet, a secondary remelting method is adopted, the brazing material sheet is firstly heated to a first brazing temperature, namely to 1500 ℃, kept for 60min, cooled to 1000 ℃ and kept for 120min; then heating to a second brazing temperature, namely 1480 ℃, and preserving heat for 60min.
And step six, after brazing is finished, cooling along with a furnace, and taking out the WRe/TZM/graphite target disc, wherein the WRe/TZM/graphite target disc specifically comprises a WRe/TZM alloy layer 10, a brazing layer 11 and a graphite layer 12.
Ultrasonic detection is carried out on the WRe/TZM/graphite target disc, namely an ultrasonic probe is adopted to generate ultrasonic pulses, the ultrasonic pulses reach the WRe/TZM/graphite target disc through a coupling medium (water), due to the difference of acoustic resistance, reflected echoes and transmitted waves are generated at the junction of various substances, the ultrasonic probe receives the reflected echoes again and converts the reflected echoes into electric signals, and then the electric signals are converted into test interface images through electromechanical signal processing.
Referring to fig. 4, ultrasonic detection is performed on the write/TZM/graphite target disk manufactured by the brazing method of the present invention, the brazing interface of the write/TZM/graphite target disk is uniform and compact, and accordingly, the reflection intensity displayed in the test interface image is very weak, the amplitude of the electric signal is very small, abnormal signals are not generated, and no brazing defects, namely, no defects of cold welding and cold welding are generated.
Referring to fig. 5, ultrasonic detection is performed on a WRe/TZM/graphite target disc manufactured by the existing brazing method, and defects such as delamination and bubbles exist at a brazing interface, accordingly, reflection intensity displayed in a test interface image is strong, electric signal amplitude is large, abnormal signals appear at a place with holes or welding defects, and brazing defects (spots in the figure are defect areas) exist, namely, defects of cold joint and cold joint removal exist.
In addition, 30 WRe/TZM alloy target discs with the diameter of 140mm and graphite target discs are selected, the brazing batch experiment is implemented by adopting the brazing method, ultrasonic detection is carried out, no defects of cold joint and cold joint removal are found, and the yield reaches 100%.
Although the present disclosure describes embodiments, not every embodiment is described in terms of a single embodiment, and such description is for clarity only, and one skilled in the art will recognize that the embodiments described in the disclosure as a whole may be combined appropriately to form other embodiments that will be apparent to those skilled in the art.
Therefore, the above description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (9)
1. A brazing method for improving the connection strength of a large-capacity rotary target disc for a CT bulb tube is characterized by comprising the following steps of: the method specifically comprises the following steps:
s1, processing a ring slot from the outer edge of the WRe/TZM alloy target disc to the center of the TZM surface of the WRe/TZM alloy target disc at certain intervals, wherein an inverted trapezoid ring slot is processed on the outermost ring, then two triangle ring slots are processed, then an inverted trapezoid ring slot is processed, then two triangle ring slots are processed, and so on;
s2, processing a ring slot at a certain distance from the outer edge of the graphite target disk to the center of the surface to be brazed of the graphite target disk, wherein a rectangular ring slot is processed at the outermost ring, two triangular ring slots are processed, a rectangular ring slot is processed, two triangular ring slots are processed, and the like;
s3, processing rectangular annular bulges on the surfaces of two sides of the brazing sheet respectively at positions corresponding to the inverted trapezoid annular slot on the TZM surface of the WRe/TZM alloy target disc and the rectangular annular slot on the surface to be brazed of the graphite target disc; processing triangular annular protrusions on the two side surfaces of the brazing material sheet at positions corresponding to the triangular annular slots;
s4, cleaning and degassing the processed WRe/TZM alloy target disc, the brazing material sheet and the graphite target disc, and sequentially stacking the WRe/TZM alloy target disc, the brazing material sheet and the graphite target disc in a furnace chamber of a vacuum brazing furnace from top to bottom;
s5, when the vacuum degree of the vacuum brazing furnace reaches 5 multiplied by 10 -2 After Pa, heating to a first brazing temperature, namely heating to 1500-1600 ℃, preserving heat for 30-90min, cooling to about 1000 ℃, and preserving heat for 100-120min; then heating to a second brazing temperature, and preserving heat for 30-90min, wherein the second brazing temperature is 10-20 ℃ lower than the first brazing temperature;
s6, after brazing is finished, cooling along with the furnace, and taking out the WRe/TZM/graphite target disc.
2. The brazing method for improving the connection strength of the high-capacity rotary target disk for the CT bulb tube, which is characterized by comprising the following steps of: in the steps S1 and S2, the interval between two adjacent annular slots on the same target disk is 2mm.
3. The brazing method for improving the connection strength of the high-capacity rotary target disk for the CT bulb tube, which is characterized by comprising the following steps of: in the steps S1 and S2, a numerical control lathe or a numerical control milling machine is adopted, and a profiling cutter matched with structures of the inverted trapezoid annular slot, the rectangular annular slot and the triangular annular slot is adopted to process each annular slot.
4. A brazing method for improving the connection strength of a large-capacity rotary target disc for a CT bulb according to any one of claims 1 to 3, wherein: in the steps S1 and S2, the long bottom edge of each inverted trapezoid annular slot is 0.2-0.8mm, the short bottom edge is 0.15-0.7mm, and the two bevel edges are 0.1-0.5mm; the long side size of each rectangular annular slot is 0.15-0.7mm, and the short side size is 0.1-0.5mm; the two sides of each triangular annular slot are 0.1-0.5mm, and the included angle of the two sides is 30-60 degrees.
5. The brazing method for improving the connection strength of the high-capacity rotary target disk for the CT bulb tube, which is characterized by comprising the following steps of: in the step S3, a numerical control lathe or a numerical control milling machine is adopted, and a profiling cutter matched with the structure of the annular protrusions is adopted to process each annular protrusion.
6. A brazing method for improving the connection strength of a large-capacity rotary target disk for a CT bulb according to claim 1 or 5, characterized by: in the step S3, the size of each annular protrusion is smaller than the corresponding reverse trapezoid annular slot, rectangular annular slot and triangular annular slot by 0.05mm.
7. The brazing method for improving the connection strength of the high-capacity rotary target disk for the CT bulb tube, which is characterized by comprising the following steps of: in the step S4, before brazing, ultrasonic cleaning is adopted to remove oil stains and dust on the surfaces of the WRe/TZM alloy target disc, the brazing material sheet and the graphite target disc.
8. The brazing method for improving the connection strength of the high-capacity rotary target disk for the CT bulb tube, which is characterized by comprising the following steps of: in the step S4, before brazing, the cleaned WRe/TZM alloy target disc, the brazing material sheet and the graphite target disc are degassed, and low-melting-point impurities on the surfaces of the WRe/TZM alloy target disc, the brazing material sheet and the graphite target disc are removed.
9. The brazing method for improving the connection strength of the high-capacity rotary target disk for the CT bulb tube, which is characterized by comprising the following steps of: the degassing method comprises the following steps: feeding the cleaned WRe/TZM alloy target disk, brazing material sheet and graphite target disk into vacuum degassing furnace, vacuum degree is superior to 5×10 -3 Pa, degassing temperature of 1000-1500 ℃ and degassing time of 0.5-5 h.
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| CH263078A (en) * | 1948-04-21 | 1949-08-15 | Sulzer Ag | Process for the production of a body of revolution to be joined together from at least two parts by means of annular seam welding. |
| GB739908A (en) * | 1952-09-29 | 1955-11-02 | Vickers Electrical Co Ltd | Improvements relating to welded joints in pipes or the like |
| SU893428A1 (en) * | 1978-08-07 | 1981-12-30 | Львовский Ордена Ленина Политехнический Институт | Automatic machine for soldering heat exchangers |
| CN101557145B (en) * | 2008-04-11 | 2010-12-22 | 上海电气集团上海电机厂有限公司 | Soldering method of conducting ring of motor rotor |
| CN105149720B (en) * | 2015-07-15 | 2017-09-19 | 哈尔滨工业大学（威海） | It is a kind of to be used for soldering electric vacuum tube fixture and method for welding of the TZM alloys/ceramic sealing alloy to seal structure |
| CN105290575B (en) * | 2015-08-05 | 2018-03-16 | 上海空间推进研究所 | A kind of electro-beam welding method of titanium alloy material and CVDNb |
| CN110181050B (en) * | 2019-06-04 | 2021-01-15 | 合肥工业大学 | WRe/TZM/graphite SPS sintering connection method |
| CN112958772A (en) * | 2021-02-02 | 2021-06-15 | 合肥工业大学 | Method for repairing waste WRe/TZM composite rotary anode target disc |
| CN112792423B (en) * | 2021-04-07 | 2021-07-06 | 陕西斯瑞新材料股份有限公司 | Method for preparing CT bulb tube rotor copper sleeve by combining vacuum diffusion welding with vacuum brazing |
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