CN109273335B - Metal and glass sealing process for CT bulb tube - Google Patents
Metal and glass sealing process for CT bulb tube Download PDFInfo
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- CN109273335B CN109273335B CN201811154735.4A CN201811154735A CN109273335B CN 109273335 B CN109273335 B CN 109273335B CN 201811154735 A CN201811154735 A CN 201811154735A CN 109273335 B CN109273335 B CN 109273335B
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- glass
- metal
- kovar ring
- metal kovar
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/16—Vessels; Containers; Shields associated therewith
- H01J35/165—Vessels; Containers; Shields associated therewith joining connectors to the tube
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/26—Sealing together parts of vessels
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Joining Of Glass To Other Materials (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
The invention discloses a metal and glass sealing process of a CT bulb tube, which comprises the steps of cleaning a glass rod, a glass tube and a metal kovar ring for sealing, carrying out hydrogen burning treatment on the metal kovar ring, winding molten glass on the metal kovar ring, butting the metal kovar ring and the glass tube, sintering and annealing, before the glass tube is butted with the metal kovar ring, a layer of molten glass is wound on the inner side edge and the outer side edge of the opening of the metal kovar ring, so that the glass tube can be directly butted with the glass of the opening of the metal kovar ring, thereby sealing the metal kovar ring and the glass tube together, effectively reducing the difficulty of sealing the metal kovar ring and the glass tube, meanwhile, the sealing part of the metal kovar ring and the glass tube is smooth, clean and integrated, and the fusion degree and the strength are high, so that the service life of the CT bulb tube is effectively prolonged.
Description
Technical Field
The invention relates to a sealing process, in particular to a metal and glass sealing process of a CT bulb tube.
Background
The CT machine is a fully functional disease detection instrument, and along with the development of the technology, the CT machine is popularized and popularized with high resolution and intuitive and accurate diagnosis effect, and is widely applied to the medical field. The CT bulb tube, also called X-ray tube, is the core component in CT machine for producing X-ray, and whether the technology of CT bulb tube is perfect or not directly affects the working effect of CT machine. The X-ray tube mainly comprises an anode, a cathode and a glass shell, wherein the anode comprises a target disc, a rotating shaft, a rotor and a bearing, and the cathode comprises a filament, a cathode head and a cathode core column. The working principle is as follows: the filament made of tungsten filament can emit enough number of electrons at high temperature as electron source; under the action of a strong electric field formed by high voltage of dozens of kilovolts to hundreds of kilovolts added between the anode and the cathode, electrons are accelerated and high-speed electron current is formed; the anode is used for attracting electrons and accelerating the electrons, and the electrons moving at high speed bombard the target surface of the target disk, and the target surface is subjected to electron bombardment so that the target surface is sharply blocked to generate X rays. The electrode system of the whole X-ray tube is packaged in a high-vacuum glass shell which is used for supporting a cathode and an anode and providing a vacuum environment necessary for high-speed electron flight and normal work of a high-temperature filament.
In order to ensure the required vacuum environment when the CT bulb works, the rotor of the anode of the CT bulb needs to be connected with the glass housing, but if the glass housing is directly connected with the rotor, for example, by using rivets, when the temperature changes or the rotor rotates at a high speed, cracks or fractures are easily generated at the interface between the rotor and the glass housing, so the current CT bulb usually realizes the connection between the rotor and the glass housing through a metal kovar ring. At present, a common connection method is that one end of a metal kovar ring is connected with a bearing bush in a rotor, the other end of the metal kovar ring is connected with a glass shell, and the metal kovar ring is made of alloy with an expansion coefficient similar to that of glass, so that the glass shell is prevented from being easily cracked or cracked at an interface due to temperature change.
At present, when a glass shell and a metal kovar ring are sealed, firstly, a contact part of a glass tube and the metal kovar ring is softened through high temperature, then, the end part of the metal kovar ring is pressed into the end face of the glass tube, or a glass tube with the inner diameter slightly larger than the outer diameter of the metal kovar ring is directly sleeved on the metal kovar ring, so that connection is carried out, and the purpose of air tightness of an interface is achieved. However, in the sealing mode, it is difficult to ensure that the end of the metal kovar ring can be accurately pressed into the end face of the glass tube, and no matter the end of the metal kovar ring is pressed into the end face of the glass tube or the glass tube is directly sleeved on the metal kovar ring, the operation is difficult, the surface of the connecting part is rough, a subsequent process is required to be added to remove edges and corners and burrs, the fusion degree of the glass tube and the metal kovar ring is not high, so that when the CT bulb tube works, the sealing position of the glass shell and the metal kovar ring is easy to break, and the service life of the CT bulb tube is not long.
Disclosure of Invention
The invention aims to solve the problem of providing a metal and glass sealing process of a CT bulb tube, which reduces the sealing difficulty of metal and glass, has smooth surface of the sealing position of the metal and the glass after sealing, high fusion degree and strength and prolongs the service life of the CT bulb tube.
In order to solve the technical problems, the technical scheme is as follows:
a metal and glass sealing process of a CT bulb tube is characterized by comprising the following steps:
(1) respectively cleaning a glass rod, a glass tube and a metal kovar ring for sealing;
(2) carrying out hydrogen burning treatment on the metal kovar ring;
(3) metal kovar coil-wound molten glass: heating the end part of the glass rod to a molten state at the temperature of 550-800 ℃, heating the opening of the metal kovar ring to be close to the molten state at the temperature of 750-900 ℃, and then winding a layer of glass in the molten state on the inner side edge and the outer side edge of the opening of the metal kovar ring by using the glass rod of which the end part is heated to the molten state;
(4) butt joint of the metal kovar ring and the glass tube: heating the opening of the glass tube at the temperature of 500-;
(5) sintering and annealing: gradually reducing the sintering temperature of the opening of the glass tube and the opening of the metal kovar ring until the temperature reaches room temperature, and completing the sealing between the metal kovar ring and the glass tube;
(6) and processing the residual oxide layer on the surface of the metal kovar ring.
The oxide layer left on the surface of the metal kovar ring can be treated in a chemical mode, and can also be treated by a manual polishing method.
The sealing process comprises the steps that firstly, a glass rod is wound on molten glass at a metal kovar ring, so that the glass is tightly combined with the surface of the metal kovar ring and can play a role of transitional connection, a softened glass tube can be directly butted with the glass at the opening molten state of the metal kovar ring, and then the glass tube is heated to be molten with the glass of the metal kovar ring, so that the metal kovar ring and the glass tube are sealed together, the phenomenon that a glass tube opening in the molten state is easy to deform and sag due to the action of gravity after the glass tube is directly heated to the molten state and is difficult to align with the edge of the metal kovar ring is avoided, the sealing difficulty of the metal kovar ring and the glass tube is effectively reduced, meanwhile, the sealing position of the metal kovar ring and the glass tube is smooth and integrated, the fusion degree and the strength are high, and the service life of a CT bulb is effectively prolonged; in addition, before sealing, the metal kovar ring is subjected to hydrogen burning treatment, so that the surface layer of the metal kovar ring is decarburized, and the phenomenon that the whole firmness and the sealing property are damaged due to the generation of black spots at the sealing position during subsequent high-temperature sealing is avoided; when glass is wound on the inner side edge and the outer side edge of the opening of the metal kovar ring, the opening of the metal kovar ring is heated to be close to a molten state (the molten state is close to a transition state between a solid state and a molten state), an oxide layer can be prevented from being formed at the position in the state, metal atoms at the position are quite active and can be permeated with the glass in the molten state, the metal kovar ring is more easily combined with the molten glass, the combination is tighter after annealing, and the firmness and the sealing property after sealing are further improved; and after the sealing is finished, the residual oxide layer on the surface of the metal kovar ring is processed, so that the sealing part is prevented from peeling off along with the falling of the oxide layer.
In a preferable scheme, in the step (1), absolute ethyl alcohol is used as a cleaning solution to clean the inner wall and the outer wall of the glass rod and the glass tube, and acetone is used as a cleaning solution to clean the inner wall and the outer wall of the metal kovar ring. And removing oxides, grease and dust on the surfaces of the glass rod, the glass tube and the metal kovar ring by cleaning.
In a preferable embodiment, in the step (2), the hydrogen burning treatment is to place the metal kovar ring in a hydrogen furnace and calcine the metal kovar ring with hydrogen, and then perform annealing treatment under the condition of continuously inputting hydrogen. The metal kovar ring is subjected to the protection of hydrogen flow in the whole calcining and annealing processes in the hydrogen furnace, so that the decarburization of the surface layer of the metal kovar ring is facilitated, and hydrogen replaces other gases in the metal kovar ring due to the diffusion of hydrogen atoms at high temperature to play a role in exhausting, so that the sealing position is firmly combined, and the air tightness is good.
In a preferable scheme, in the step (3), the time for heating the opening of the metal kovar ring is 8-15 min.
In a further preferable scheme, in the step (3), the glass rod winds the molten glass on the inner side edge and the outer side edge of the opening of the metal kovar ring until the glass on the inner side edge and the glass on the outer side edge are converged to form a glass layer.
In a preferred scheme, the metal kovar ring is made of iron-nickel-cobalt alloy.
The invention has the beneficial effects that: the sealing process of the metal and the glass of the CT bulb tube effectively reduces the sealing difficulty of the metal and the glass, and meanwhile, the sealing position of the metal and the glass after sealing has smooth surface, good air tightness, high fusion degree and strength, and improves the service life of the CT bulb tube.
Drawings
FIG. 1 is a schematic view showing a structure in which a metal kovar coil is wound around molten glass in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a metal kovar ring and a glass tube in butt joint in the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of the sealing between the metal kovar ring and the glass tube in the embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments:
the metal-glass sealing process for the CT bulb tube shown in fig. 1-3 comprises the following steps:
(1) the glass rod, the glass tube 1 and the metal kovar ring 2 for sealing are respectively cleaned: absolute ethyl alcohol is used as cleaning liquid to clean the inner wall and the outer wall of the glass rod and the glass tube 1, and acetone is used as cleaning liquid to clean the inner wall and the outer wall of the metal kovar ring 2. Removing oxides, grease and dust on the surfaces of the glass rod, the glass tube 1 and the metal kovar ring 2 by cleaning;
(2) and (3) carrying out hydrogen burning treatment on the metal kovar ring 2: the hydrogen burning treatment is to place the metal kovar ring 2 in a hydrogen furnace and calcine it with hydrogen, and then to perform annealing treatment under the condition of continuously feeding hydrogen. The metal kovar ring 2 is subjected to the protection of hydrogen flow in the whole calcining and annealing process in the hydrogen furnace, so that the surface layer of the metal kovar ring 2 is decarbonized, and hydrogen replaces other gases in the metal kovar ring 2 due to the diffusion of hydrogen atoms at high temperature to play a role in exhausting, so that the sealing position is firmly combined, and the air tightness is good.
(3) Metal kovar 2 winding molten glass: heating the end part of the glass rod to a molten state at the temperature of 550-800 ℃, carrying out heating treatment on the opening of the metal kovar ring 2 for 8-15min at the temperature of 750-900 ℃ until the opening of the metal kovar ring 2 is in a nearly molten state, and then winding a layer of molten glass on the inner side edge and the outer side edge of the opening of the metal kovar ring 2 by using the glass rod with the end part heated to the molten state until the glass on the inner side edge and the outer side edge is converged to form a glass layer 3.
(4) The metal kovar ring 2 is butted with the glass tube 1: heating the opening of the glass tube 1 at the temperature of 500-;
(5) sintering and annealing: gradually reducing the sintering temperature of the opening of the glass tube 1 and the opening of the metal kovar ring 2 until the temperature reaches room temperature, and completing the sealing between the metal kovar ring 2 and the glass tube 1;
(6) and processing the residual oxide layer on the surface of the metal kovar ring.
Further, the metal kovar ring 2 is made of iron-nickel-cobalt alloy.
Claims (4)
1. A sealing process of metal and glass of a CT bulb tube is characterized by comprising the following steps:
(1) respectively cleaning a glass rod, a glass tube and a metal kovar ring for sealing;
(2) carrying out hydrogen burning treatment on the metal kovar ring;
(3) metal kovar coil-wound molten glass: heating the end part of a glass rod to a molten state at the temperature of 550-800 ℃, heating and oxidizing the opening of the metal kovar ring at the temperature of 750-900 ℃, wherein the time for heating and oxidizing the opening of the metal kovar ring is 8-15min, and then winding a layer of molten glass on the inner side edge and the outer side edge of the opening of the metal kovar ring by using the glass rod with the end part heated to the molten state until the glass on the inner side edge and the outer side edge is converged to form a glass layer;
(4) butt joint of the metal kovar ring and the glass tube: heating the opening of the glass tube at the temperature of 500-;
(5) sintering and annealing: and gradually reducing the sintering temperature of the opening of the glass tube and the opening of the metal kovar ring until the temperature reaches room temperature, and completing the sealing between the metal kovar ring and the glass tube.
2. The process of claim 1 for sealing between metal and glass of a CT bulb, wherein: in the step (1), absolute ethyl alcohol is used as cleaning liquid to clean the inner wall and the outer wall of the glass rod and the glass tube, and acetone is used as cleaning liquid to clean the inner wall and the outer wall of the metal kovar ring.
3. The process of claim 1 for sealing between metal and glass of a CT bulb, wherein: in the step (2), the hydrogen burning treatment is to place the metal kovar ring in a hydrogen furnace and calcine the metal kovar ring by using hydrogen, and then perform annealing treatment under the condition of continuously inputting hydrogen.
4. The process of claim 1 for sealing between metal and glass of a CT bulb, wherein: the metal kovar ring is made of iron-nickel-cobalt alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811154735.4A CN109273335B (en) | 2018-09-30 | 2018-09-30 | Metal and glass sealing process for CT bulb tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811154735.4A CN109273335B (en) | 2018-09-30 | 2018-09-30 | Metal and glass sealing process for CT bulb tube |
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| Publication Number | Publication Date |
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| CN109273335A CN109273335A (en) | 2019-01-25 |
| CN109273335B true CN109273335B (en) | 2020-10-13 |
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| CN115417584B (en) * | 2022-09-16 | 2023-03-21 | 珠海瑞能真空电子有限公司 | Manufacturing process of CT bulb tube |
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| CN101798184B (en) * | 2010-02-26 | 2012-09-05 | 北京天瑞星光热技术有限公司 | Sealing connection method of metal and glass of novel medium-high temperature solar energy heat collection pipe |
| CN202434460U (en) * | 2011-12-21 | 2012-09-12 | 王建军 | Environmental-friendly CT (Computed Tomography) metal X-ray tube |
| CN102838292A (en) * | 2012-10-08 | 2012-12-26 | 北京工业大学 | Glass-metal sealing structure of high-temperature collector tube |
| CN202993623U (en) * | 2012-11-21 | 2013-06-12 | 山东禄禧新能源科技有限公司 | Metal heat tube type vacuum solar collector tube utilizing sealing technology |
| CN103408220A (en) * | 2013-07-13 | 2013-11-27 | 北京工业大学 | Trench type photo-thermal utilization high-temperature heat collection pipe end head sealing structure |
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