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CN-121992405-A - Anode rotor heat radiation coating and preparation method and application thereof

CN121992405ACN 121992405 ACN121992405 ACN 121992405ACN-121992405-A

Abstract

The invention provides an anode rotor heat radiation coating, a preparation method and application thereof, belonging to the technical field of metal surface treatment, wherein the anode rotor heat radiation coating comprises a bonding layer, a stress slow-release layer and a heat radiation layer which are sequentially laminated on the surface of an anode rotor matrix; the bonding layer comprises a Ni layer, the stress release layer comprises a metal-carbon composite layer, metal elements in the metal-carbon composite layer comprise Cr and/or Ti, and the heat radiation layer comprises a graphite-like carbon material layer. The anode rotor coating effectively solves the problem of internal stress of the coating, improves the heat conduction and vacuum heat dissipation performance of the coating, does not bleed air or volatilize substances under the working condition of high-temperature heat circulation of the anode rotor, and keeps good compactness and bonding strength, so that the stability and the service life of the anode rotor under the thermal shock working condition are effectively improved.

Inventors

  • MIAO SHU
  • ZOU YUN
  • WANG HAITANG

Assignees

  • 苏州益腾电子科技有限公司

Dates

Publication Date
20260508
Application Date
20260409

Claims (10)

  1. 1. The heat radiation coating of the anode rotor is characterized by comprising a bonding layer, a stress slow-release layer and a heat radiation layer which are sequentially laminated on the surface of a substrate of the anode rotor, wherein the bonding layer comprises a Ni layer, the stress slow-release layer comprises a metal-carbon composite layer, metal elements in the metal-carbon composite layer comprise Cr and/or Ti, and the heat radiation layer comprises a graphite-like carbon material layer.
  2. 2. The anode rotor heat radiation coating according to claim 1, wherein the metal element content in the metal-carbon composite layer gradually decreases from the anode rotor base body to the coating surface direction.
  3. 3. The anode rotor heat radiation coating according to claim 2, wherein the metal-carbon composite layer comprises a metal layer and a metal-carbon composite layer laminated in this order.
  4. 4. The anode rotor heat radiation coating according to claim 3, wherein the metal-carbon composite material layer has a content of metal element of 5 to 99 atomic percent; and/or the metal-carbon composite material layer comprises at least two gradient layers which are arranged in a stacked manner.
  5. 5. The anode rotor heat radiation coating according to claim 1, wherein the percentage of sp 2 hybridized carbon atoms in the graphite-like carbon material in the total number of carbon atoms is not less than 70%.
  6. 6. The anode rotor heat radiation coating according to claim 1, wherein the material of the graphite-like carbon material layer comprises graphite-like carbon doped with metal elements, and the metal elements in the graphite-like carbon material layer at least comprise metal elements of the stress release layer.
  7. 7. The anode rotor heat radiation coating according to claim 6, wherein the graphite-like carbon material layer contains less than or equal to 3 atomic percent of metal elements.
  8. 8. The anode rotor heat radiation coating according to claim 1, wherein the thickness of the bonding layer is 0.1 to 0.5 μm; And/or the stress release layer has a thickness of 0.2-2 μm; And/or the thickness of the heat radiation layer is 0.2-2.0 μm.
  9. 9. A method for producing the heat radiation coating of an anode rotor according to any one of claims 1 to 8, comprising the steps of: and sequentially depositing a bonding layer, a stress slow-release layer and a heat radiation layer on the surface of the anode rotor matrix by adopting a vapor deposition method.
  10. 10. An anode rotor comprising an anode rotor substrate and the anode rotor heat radiation coating of any one of claims 1-8 on the anode rotor substrate.

Description

Anode rotor heat radiation coating and preparation method and application thereof Technical Field The invention belongs to the technical field of metal surface treatment, and particularly relates to a heat radiation coating of an anode rotor, and a preparation method and application thereof. Background Computed Tomography (CT) bulbs are the core radiation source of modern medical images whose performance directly determines imaging speed, resolution and device reliability. Inside the bulb, a rotating anode assembly is a critical energy conversion and bearing component, which consists of a target disk rotating at high speed, a rotor and a base body. In a CT working cycle, an electron beam emitted from a cathode continuously bombards a target surface focus track with extremely high power, generates X-rays and simultaneously generates huge heat, so that the local instantaneous temperature of a target disc can exceed 2000 ℃. The rotary anode assembly is thus in service for a long period of time under extremely severe conditions. Because the bearing is in the vacuum environment, the heat dissipation efficiency of the rotor and the stability of the coating structure are ensured on the premise of ensuring the stable operation of the bearing. For the rotor itself, its performance directly determines the power load and imaging stability of the bulb. The anode rotor generally takes oxygen-free copper or copper alloy with high heat conductivity as a matrix, and the huge heat load generated by the bombardment of the electron beam on the target surface is dispersed by high-speed rotation (which can usually reach thousands of revolutions per minute or even tens of thousands of revolutions per minute), so that the melting loss of the target surface caused by local overheating is avoided. In the working process, the rotor is not only subjected to extremely high centrifugal force and mechanical stress, but also in a severe circulating state due to intermittent bombardment of electron beams, and the surface temperature can rapidly fluctuate in the range of room temperature and 400 ℃ or even higher. The extreme thermal shock conditions place severe demands on the performance of the rotor, requiring excellent wear resistance, stable thermal conductivity, high radiant heat dissipation efficiency, and durability under long term thermal shock conditions. At present, a thermal spraying process is generally adopted in the industry to spray aluminum oxide or titanium oxide materials, or an electroplating process is adopted to deposit a hard chromium layer or a black chromium layer, so that a functional coating, namely a thermal radiation layer, is formed on the surface of the copper-based rotor to radiate heat. However, the coatings produced by thermal spraying can generate large thermal stresses, and the copper materials are softer and can deform. The electroplating coating adopts an electrochemical method, the deposition process is in a liquid state environment, and various inorganic or organic compounds are required to serve as corrosion inhibitors in the electrodeposition process to reduce stress, so that introduction of impurities is probably brought, and gas release in a high-temperature environment is initiated. In addition, the coating has the common problems of high internal stress and expansion mismatch with the matrix, so that under the conditions of high power and high cycle thermal cycle of actual operation, if cracks exist in an initial state, after one-time service, the coating is extremely easy to crack and expand to peel off and lose efficacy. Failure of the coating not only reduces the heat radiation efficiency of the rotor and affects the heat radiation balance, but also the spalling substance can damage the vacuum environment inside the bulb or cause ignition, so that the image quality is reduced and the equipment is damaged in advance. Therefore, it is necessary to provide a coating layer adapted to the extreme working conditions of the anode rotor, so as to improve the heat radiation performance and the heat cycle stability of the rotor, thereby improving the overall performance and the reliability of the bulb tube. Disclosure of Invention The invention aims to provide a heat radiation coating of an anode rotor, a preparation method and application thereof, and the heat radiation performance and the heat circulation stability of the anode rotor are improved. In order to achieve the aim of the invention, the invention adopts the following technical scheme: according to the first aspect, the invention provides an anode rotor heat radiation coating, which comprises a bonding layer, a stress slow-release layer and a heat radiation layer which are sequentially laminated on the surface of an anode rotor substrate, wherein the bonding layer comprises a Ni layer, the stress slow-release layer comprises a metal-carbon composite layer, metal elements in the metal-carbon composite layer comprise Cr and/or Ti, and the heat