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A kind of preparation method of at13~at40 coating that improves thermal radiation coefficient

A heat radiation coefficient, AT13 technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of insufficient coating bonding force, poor heat transfer effect, and easy-to-shed coating thermal radiation coefficient, etc. Achieve the effect of increasing the bonding strength, solving the problem of easy falling off, and improving the thermal radiation coefficient

Active Publication Date: 2022-01-11
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, electroplating or thermal spraying is usually carried out on the outer surface of the rotor copper sleeve of the X-ray tube to form a coating to transfer heat; The following defects generally exist in the existing technology: the problem of easy peeling off due to insufficient bonding force of the coating and the problem of poor heat transfer effect caused by the large thermal radiation coefficient of the coating

Method used

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  • A kind of preparation method of at13~at40 coating that improves thermal radiation coefficient
  • A kind of preparation method of at13~at40 coating that improves thermal radiation coefficient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: a kind of preparation method of the AT13 coating that improves thermal emissivity, comprises the following steps:

[0019] (1) Purification of raw materials: Al 2 o 3 、TiO 2 , CaF 2 , CoO raw material powders were put into different corundum crucibles, and the temperature was raised to 300 °C at a heating rate of 10 °C / min and kept for 1.5 hours to remove adsorbed water, crystal water and volatile impurities in the raw material powders;

[0020] (2) Powder blending: blending according to mass percentage, specifically: TiO 2 13%, CaF 2 3%, CoO 2%, Al 2 o 3 The balance; and prepare the prepared raw materials by mechanical ball milling to obtain AT13 / CaF 2 / CoO composite powder; the specific steps of the mechanical ball milling method are: the mixed ingredients are transferred to a sealed ball milling tank, and the ball milling speed is 100rpm / min. Under the mechanical ball milling condition, the alternate forward and reverse ball milling 15h is obta...

Embodiment 2

[0024] Embodiment 2: a kind of preparation method of the AT20 coating that improves thermal emissivity, comprises the following steps:

[0025] (1) Purification of raw materials: Al 2 o 3 、TiO 2 , CaF 2, CoO raw material powders were put into different corundum crucibles, and the temperature was raised to 300°C at a heating rate of 10°C / min and kept for 3h;

[0026] (2) Powder blending: blending according to mass percentage, specifically: TiO 2 20%, CaF 2 4%, CoO 2.5%, Al 2 o 3 The balance; and the prepared raw materials are prepared by mechanical ball milling to obtain AT20 / CaF 2 / CoO composite powder; the specific steps of the mechanical ball milling method are: the mixed ingredients are transferred to a sealed ball milling tank, and the ball milling speed is 300rpm / min under the mechanical ball milling condition of 300rpm / min.

[0027] (3) Substrate treatment: pre-treat the substrate; specifically include: heat-treat the substrate under the protection of inert gas...

Embodiment 3

[0030] Embodiment 3: a kind of preparation method of the AT40 coating that improves thermal emissivity, comprises the following steps:

[0031] (1) Purification of raw materials: Al 2 o 3 、TiO 2 , CaF 2 , CoO raw material powders were put into different corundum crucibles, and the temperature was raised to 300°C at a heating rate of 10°C / min and kept for 5h;

[0032] (2) Powder blending: blending according to mass percentage, specifically: TiO 2 40%, CaF 2 5%, CoO 3%, Al 2 o 3 The balance; and prepare the prepared raw materials by mechanical ball milling method to obtain AT40 / CaF 2 / CoO composite powder; the specific steps of the mechanical ball milling method are: the mixed ingredients are transferred to a sealed ball milling tank, and the ball milling speed is 500rpm / min under the mechanical ball milling condition of alternating forward and reverse ball milling for 20h to obtain the ball milling product;

[0033] (3) Substrate treatment: pre-treat the substrate; sp...

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Abstract

The present invention provides a kind of preparation method of AT13~AT40 coating that improves thermal emissivity, comprising adding Al 2 O 3 、TiO 2 , CaF 2 , CoO raw material powder impurity removal and batching; pretreatment of the substrate; plasma spraying to form a conforming coating; surface performance optimization of the prepared coating; the present invention adds a small amount of CaF to AT13-AT40 2 and CoO as an improvement, using CoO to improve the thermal emissivity coefficient of the coating, and adding CaF 2 The porosity in the coating can be gradually increased, so that the contact angle gradually increases with the increase of the porosity, which is more conducive to CoO being wrapped in the voids, and finally forms a composite thermal spray coating with a thermal radiation coefficient ≥ 0.80.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying materials, and in particular relates to a method for preparing AT13-AT40 coatings with improved thermal radiation coefficient. Background technique [0002] X-rays are widely used in CT scanners, and the core component for generating X-rays is the X-ray tube. The X-ray tube contains two electrodes, an anode and a cathode, which are respectively used to receive the target material bombarded by electrons and the filament to emit electrons. Both stages are hermetically sealed in high vacuum glass or ceramic enclosures. The power supply part of the X-ray tube includes at least a low-voltage power supply for heating the filament and a high-voltage generator for applying high voltage to the two poles. When the tungsten wire passes enough current to generate an electron cloud, and a sufficient voltage (kilovolt level) is applied between the anode and the cathode, the electron cloud is pulled t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/10C04B35/117C04B35/626
CPCC23C4/134C23C4/10C04B35/117C04B35/62605C04B2235/3232C04B2235/3275C04B2235/445
Inventor 杨平陈梅侯蕊杨维娟樊龙辉
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD