X-ray tube with graphene coating

Abstract

The utility model provides an X-ray tube with a graphene coating, which comprises a glass shell tube with a first end and a second end which are oppositely arranged; the anode assembly is sealed at the first end of the glass shell tube; the cathode assembly is sealed at the second end of the glass shell tube; the internal toughening layer is positioned on the inner side of the glass shell tube; the internal graphene layer is located on the side, away from the glass shell tube, of the internal toughening layer, and the internal graphene layer is electrically connected with at least one of the cathode assembly and the anode assembly. According to the X-ray tube with the graphene coating, secondary electrons are released through the internal graphene layer, high-voltage breakdown damage caused by accumulation of the secondary electrons is avoided, and graphene optimizes the insulation performance of the glass under a high-voltage working condition, so that the glass shell tube can bear high voltage between the cathode assembly and the anode assembly, and the service life of the X-ray tube is prolonged. And the probability that the glass is broken down is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to X ray tube technical field relates to a kind of X ray tubes with graphene plating. BACKGROUND

[0002] X ray tube is used to produce X ray's device, is widely used in medical imaging, material science, security check and industrial nondestructive testing etc.

[0003] In X ray tube, glass shell tube is generally used to seal cathode assembly and anode assembly, glass as insulator, can effectively isolate anode assembly and cathode assembly.But in X ray tube work, when cathode current hits anode, secondary electron will be generated, glass as a kind of insulator, cannot timely release the electric energy generated by secondary electron, will cause secondary electron to accumulate in the inner surface of glass shell tube, so that glass X ray tube appears high voltage breakdown damage condition.

[0004] Therefore, how to provide a kind of X ray tube with graphene plating, to release secondary electron, optimize the insulation performance of glass shell tube, become the technical problem of the technical personnel in the field to be solved urgently. UTILITY MODEL CONTENT

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a kind of X ray tube with graphene plating, to solve the problem that glass shell tube cannot release secondary electron in prior art, glass withstand voltage is low.

[0006] To achieve the above-mentioned purpose and other related purposes, the utility model provides a kind of X ray tube with graphene plating, comprising:

[0007] Glass shell tube, the glass shell tube has oppositely arranged first end and second end;

[0008] Anode assembly, sealed in the first end of the glass shell tube;

[0009] Cathode assembly, sealed in the second end of the glass shell tube;

[0010] Internal toughening layer, located in the inner side of the glass shell tube;

[0011] Internal graphene layer, located in the side of the internal toughening layer away from the glass shell tube, the internal graphene layer and at least one of the cathode assembly and the anode assembly are electrically connected.

[0012] Optionally, the thickness of the internal graphene layer ranges from 100nm to 2000nm.

[0013] Optionally, the thickness of the glass shell tube ranges from 1mm to 1.5mm.

[0014] Optionally, an X-ray exit window is arranged between the first end of the glass envelope tube and the second end of the glass envelope tube, and when the electrons emitted by the cathode assembly hit the target material of the anode assembly, X-rays generated by the electrons are emitted from the X-ray exit window.

[0015] Optionally, the internal toughening layer and the internal graphene layer cover the X-ray exit window.

[0016] Optionally, the internal toughening layer and the internal graphene layer avoid the X-ray exit window.

[0017] Optionally, further comprising:

[0018] An external toughening layer is arranged on the outer side of the glass envelope tube.

[0019] An external graphene layer is arranged on the side of the external toughening layer away from the glass envelope tube, and the external graphene layer is electrically connected to at least one of the cathode assembly and the anode assembly.

[0020] Optionally, the thickness of the external graphene layer ranges from 100 nm to 2000 nm.

[0021] As described above, in the X-ray tube with the graphene coating layer, the secondary electrons are released by the internal graphene layer, so that the accumulation of the secondary electrons is avoided to cause high-voltage breakdown damage, and the insulating performance of the glass is optimized by the graphene under high-voltage working conditions, so that the glass envelope tube can withstand the high voltage between the cathode assembly and the anode assembly, and the probability of the glass being broken down is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The figure shows the schematic diagram of the X-ray tube with the graphene coating layer in the embodiment of the utility model.

[0023] Element number explanation

[0024] 1 glass envelope tube

[0025] 2 anode assembly

[0026] 3 cathode assembly

[0027] 4 internal toughening layer

[0028] 5 internal graphene layer

[0029] 6 X-ray exit window DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail with specific examples. Those skilled in the art can easily understand other advantages and functions of the present application from the content disclosed in the specification. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application.

[0031] Please refer to Figure 1 It should be noted that the drawings provided in the embodiments only schematically illustrate the basic concept of the present application, and the drawings only show the components related to the present application, not the number, shape and size of the components during actual implementation. The shape, number and proportion of each component during actual implementation can be randomly changed, and the component layout pattern can be more complex.

[0032] Embodiment one

[0033] The embodiment provides an X-ray tube with a graphene coating layer, please refer to Figure 1 , including a glass shell tube 1, an anode assembly 2, a cathode assembly 3, an internal toughening layer 4 and an internal graphene layer 5, the glass shell tube 1 has a first end and a second end arranged oppositely; the anode assembly 2 is sealed to the first end of the glass shell tube 1; the cathode assembly 3 is sealed to the second end of the glass shell tube 1; the internal toughening layer 4 is located on the inner side of the glass shell tube 1; the internal graphene layer 5 is located on the side of the internal toughening layer 4 away from the glass shell tube 1, and the internal graphene layer 5 is electrically connected with the cathode assembly 3.

[0034] As an example, the internal toughening layer 4 adopts a sandblasting layer, and the material thereof includes alumina sand. If the internal graphene layer 5 and the glass shell tube 1 are directly contacted, the bonding force therebetween is weak. By arranging the internal toughening layer 4 between the glass shell tube 1 and the internal graphene layer 5, the bonding force of the internal graphene layer 5 is improved. In addition, the internal toughening layer 4 makes the surface of the workpiece form a longer electron path and a deeper wave trough, so as to avoid excessive dark current from causing sparking and causing irreversible damage to the glass shell tube 1.

[0035] As an example, an X-ray exit window 6 is arranged between the first end of the glass shell tube 1 and the second end of the glass shell tube 1. When the electrons emitted by the cathode assembly 3 hit the target material of the anode assembly 2, the X-rays generated are emitted from the X-ray exit window 6.

[0036] As an example, when the electrons emitted by the cathode assembly 3 hit the target of the anode assembly 2, secondary electrons are generated in addition to the X-rays, and the secondary electrons are released by the cathode assembly 3 through the internal graphene layer 5 to avoid accumulation of the secondary electrons.

[0037] As an example, the voltage between the cathode and the anode of the X-ray tube is usually as high as thousands of volts (KV), and if the internal graphene layer 5 is not provided, the length of the glass shell tube 1 between the cathode assembly 3 and the anode assembly 2 is L1, and the glass shell tube 1 with sufficient length can withstand the high voltage between the cathode assembly 3 and the anode assembly 2; in the embodiment, the internal graphene 5 is present between the cathode assembly 3 and the anode assembly 2 with a length of L2 and the glass shell tube 1 with a length of L3, graphene is the strongest bond of single carbon atoms connected together, and has the characteristics of electrical conduction in specific cases, and the configuration and switching characteristics of the band gap can well adapt to the above high-voltage glass X-ray tube environment, and the insulation performance of the glass is optimized under the working conditions of high pressure and high temperature, and can withstand the high voltage between the cathode assembly 3 and the anode assembly 2.

[0038] As an example, in the embodiment, the internal toughening layer 4 and the internal graphene layer 5 cover the X-ray exit window 6, in order to ensure that the X-ray transmittance is not affected, the thickness of the glass shell tube 1 is 1mm-1.5mm, and the thickness of the internal graphene layer 5 is 100nm-2000nm. Since the elements with low atomic number have weak X-ray blocking ability, even if the internal toughening layer 4 and the internal graphene layer 5 cover the X-ray exit window 6, the X-ray exit quality will not be affected. Of course, in other examples, the internal toughening layer 4 and the internal graphene layer 5 can be arranged to avoid the X-ray exit window 6, and the selection is made according to the requirements.

[0039] As an example, in the embodiment, the internal graphene layer 5 is arranged to be connected with the cathode assembly 3, and in other examples, the internal graphene layer 5 can be arranged to be electrically connected with the anode assembly 2, or the internal graphene layer 5 is arranged to be electrically connected with the cathode assembly 3 and the anode assembly 2 at the same time, and the selection is made according to the actual requirements.

[0040] As an example, the working voltage of the X-ray tube is high, in some cases, the glass shell tube 1 will be from the outer wall to the inner wall breakdown, in the embodiment, the X-ray tube also includes an external toughening layer and an external graphene layer (not shown in the figure), the external toughening layer is located on the outside of the glass shell tube 1, the external graphene layer is located on the side of the external toughening layer away from the glass shell tube 1, the external graphene layer is electrically connected with at least one of the cathode assembly 3 and the anode assembly 2, to avoid the glass shell tube 1 from the outer wall to the inner wall breakdown.

[0041] As described above, in the X-ray tube with graphene coating of the embodiment, the secondary electrons are released through the internal graphene layer, avoiding the accumulation of secondary electrons to cause high voltage breakdown damage, and the graphene optimizes the insulation performance of the glass under high pressure working condition, so that the glass shell tube can withstand the high voltage between the cathode assembly and the anode assembly, greatly reducing the probability of glass breakdown.

[0042] Embodiment two

[0043] The embodiment provides a manufacturing method of an X-ray tube with a graphene coating, which is used for manufacturing the X-ray tube with the graphene coating in the embodiment one, and comprises the following steps:

[0044] (1) providing the glass shell 1, cleaning the glass shell 1 with distilled water, then putting it into acetone, ultrasonic oscillation at room temperature for 15 minutes, heating to 60 DEG C, then washing with deionized water, after washing, soaking in 75% ethanol for 15 min for dehydration, after completion, repeating the washing and dehydration steps twice, taking out and putting into an oven for 60 DEG C drying for 30 minutes;

[0045] (2) polishing the glass shell 1, the thickness of the provided glass shell 1 is 1.8 mm, and the thickness after polishing is 1 mm to 1.5 mm, wherein the polishing is to increase the surface roughness, and the surface of the glass shell 1 is further cleaned;

[0046] (3) using compressed air to form a high-speed jet beam, high-speed spraying of the spraying material (alumina sand, etc.) to the surface of the polished glass shell 1 to form a toughening layer, the sand blasting can make the surface of the workpiece form a longer electron path and a deeper wave trough, at the same time, the workpiece surface obtains a certain cleanliness and roughness, and also reduces the influence of the mechanical strength decrease caused by polishing of the glass shell;

[0047] (iv) the prepared tooling is sleeved on the glass shell 1 after sandblasting, exposing the part that needs to be plated with a graphene layer, and then placed in a deposition chamber, the temperature of the deposition chamber is set to 400 DEG C, an ethane atmosphere is introduced, the gas pressure in the deposition chamber is maintained at 10Pa, and a graphene layer with a thickness of 100nm is evaporated on the surface of the glass shell 1 after sandblasting by using a graphene evaporation source, and then the temperature of the deposition chamber is slowly cooled to room temperature;

[0048] (v) test the light transmittance, equivalent resistance and voltage resistance value of the glass shell assembly with the graphene layer and the toughening layer, and see if the test passes the requirements;

[0049] (vi) provide a cathode assembly 3 and an anode assembly 2, and seal the cathode assembly 3 and the anode assembly 2 with the glass shell 1.

[0050] In summary, in the X-ray tube with a graphene plating layer, the secondary electrons are released by the internal graphene layer, avoiding the accumulation of secondary electrons leading to high voltage breakdown damage, and the graphene optimizes the insulation performance of the glass under high pressure working conditions, so that the glass shell tube can withstand the high voltage between the cathode assembly and the anode assembly, greatly reducing the probability of glass breakdown. Therefore, the utility model effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0051] The above embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. An X-ray tube having a graphene coating, characterized by, The glass tube has a first end and a second end arranged oppositely; The anode assembly is sealed to the first end of the glass tube; The cathode assembly is sealed to the second end of the glass tube; The internal toughening layer is located on the inner side of the glass tube; The internal graphene layer is located on the side of the internal toughening layer away from the glass tube, and the internal graphene layer is electrically connected to at least one of the cathode assembly and the anode assembly. The thickness of the internal graphene layer ranges from 100 nm to 2000 nm.

2. The X-ray tube with graphene coating according to claim 1, characterized in that: The thickness of the glass tube ranges from 1 mm to 1.5 mm.

3. The X-ray tube with graphene coating according to claim 1, characterized in that: An X-ray exit window is arranged between the first end of the glass tube and the second end of the glass tube, and when the electrons emitted by the cathode assembly hit the target material of the anode assembly, the generated X-rays are emitted from the X-ray exit window.

4. The X-ray tube with graphene coating according to claim 1, characterized in that: The internal toughening layer and the internal graphene layer cover the X-ray exit window.

5. The X-ray tube with graphene coating according to claim 4, characterized in that: The internal toughening layer and the internal graphene layer avoid the X-ray exit window.

6. The X-ray tube with graphene coating according to claim 4, characterized in that: Further comprising:

7. The X-ray tube with graphene coating according to claim 1, characterized in that, The external toughening layer is located on the outer side of the glass tube; The external graphene layer is located on the side of the external toughening layer away from the glass tube, and the external graphene layer is electrically connected to at least one of the cathode assembly and the anode assembly. The thickness of the external graphene layer ranges from 100 nm to 2000 nm.

8. The X-ray tube with graphene coating according to claim 7, characterized in that: ​

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