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Preparation method capable of improving thermal radiation coefficient for AT13-AT40 coating

A thermal emissivity, AT13 technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of poor heat transfer effect, easy to fall off coating thermal emissivity, insufficient coating adhesion, etc. To achieve the combined strength of the commission, improve the thermal radiation coefficient, and solve the effect of easy falling off

Active Publication Date: 2020-05-15
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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  • Preparation method capable of improving thermal radiation coefficient for AT13-AT40 coating
  • Preparation method capable of improving thermal radiation coefficient for AT13-AT40 coating

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 invention provides a preparation method capable of improving a thermal radiation coefficient for an AT13-AT40 coating. The preparation method comprises the following steps of removing impurities from Al2O3, TiO2, CaF2 and CoO raw material powder and carrying out proportioning; pre-treating a matrix; carrying out plasma spraying to form a composite coating; and carrying out surface performanceoptimization treatment on the prepared coating. According to the preparation method, a small amount of CaF2 and CoO are added into AT13-AT40 for improvement, CoO is used for improving the thermal radiation coefficient of the coating, and the added CaF2 can gradually increase the porosity in the coating, so that the contact angle is gradually increased along with the increase of the porosity, and therefore, CoO can be better wrapped in the gaps, and finally the composite thermal spraying coating with the thermal radiation coefficient larger than or equal to 0.80 is formed.

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 Applications(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