Preparation method for rare-earth metal-molybdenum binary diffusion coating on surface of kovar alloy

A technology of rare earth metal and permeation coating, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems of thin permeation coating, poor comprehensive performance of Kovar alloy, low binary permeation rate, etc. Achieve the effect of low cost, low diffusion activation energy, and remarkable comprehensive effect of coating

Pending Publication Date: 2019-03-19
XIAN SEAL ELECTRONICS MATERIAL TECH CO LTD
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Problems solved by technology

[0005] Based on the problems existing in the prior art, the present invention provides a preparation method for the rare earth metal-molybdenum binary plating layer on the surface of the Kovar alloy, which solves the problems caused by the low binary plating rate and the thin thickness of the plating layer in the prior art. Technical problems such as poor comprehensive performance of cutting alloys

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  • Preparation method for rare-earth metal-molybdenum binary diffusion coating on surface of kovar alloy

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Embodiment 1

[0025] The method of the present embodiment comprises the following steps:

[0026] Step 1. Pretreatment of the Kovar alloy substrate: it is necessary to thoroughly remove the oil stains, residues and oxide film on the surface of the substrate to obtain a clean active surface. Place the Kovar alloy substrate in alcohol and ultrasonically clean it for 15 minutes to remove surface grease; use a sandblasting machine to treat the surface of the Kovar alloy substrate, choose 46# brown corundum for sandblasting roughening treatment, and the sandblasting pressure is 0.4MPa; After taking it out, wash it with deionized water and alcohol, and dry it to obtain a Kovar alloy matrix.

[0027] Step 2, preparing the rare earth metal-molybdenum binary coating: the rare earth metal is used as the infiltration activator in the coating system, and lanthanum (La), cerium (Ce), neodymium (Nd) or samarium (Sm) are selected respectively. In view of the space, they will not be given one by one. Tak...

Embodiment 2

[0035] The method of the present embodiment comprises the following steps:

[0036] Step 1. It is necessary to thoroughly remove the oil, residue and oxide film on the surface of the substrate to obtain a clean active surface. Place the Kovar alloy substrate in alcohol and ultrasonically clean it for 15 minutes to remove surface grease; use a sandblasting machine to treat the surface of the Kovar alloy substrate, choose 46# brown corundum for sandblasting roughening treatment, and the sandblasting pressure is 0.4MPa; After taking it out, wash it with deionized water and alcohol, and dry it to obtain a Kovar alloy matrix.

[0037]Step 2, preparing the rare earth metal-molybdenum binary coating: the rare earth metal is used as the infiltration activator in the coating system, and lanthanum (La), cerium (Ce), neodymium (Nd) or samarium (Sm) are selected respectively. The present invention takes the rare earth La as an example to investigate the influence of different contents of...

Embodiment 3

[0045] The method of the present embodiment comprises the following steps:

[0046] Step 1. It is necessary to thoroughly remove the oil, residue and oxide film on the surface of the substrate to obtain a clean active surface. Place the Kovar alloy substrate in alcohol and ultrasonically clean it for 15 minutes to remove surface grease; use a sandblasting machine to treat the surface of the Kovar alloy substrate, choose 46# brown corundum for sandblasting roughening treatment, and the sandblasting pressure is 0.4MPa; After taking it out, wash it with deionized water and alcohol, and dry it to obtain a Kovar alloy matrix.

[0047] Step 2, preparing the rare earth metal-molybdenum binary coating: the rare earth metal is used as the infiltration activator in the coating system, and lanthanum (La), cerium (Ce), neodymium (Nd) or samarium (Sm) are selected respectively. The present invention takes the rare earth La as an example to investigate the influence of different contents o...

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Abstract

The invention provides a preparation method for a rare-earth metal-molybdenum binary diffusion coating on the surface of a kovar alloy. The method comprises the following steps that the uniform and compact rare-earth metal-molybdenum binary diffusion coating is formed on the surface of the kovar alloy by adopting a supersonic plasma spraying technology. The kovar alloy is subjected to combined oilremoval, pickling and activating, a supersonic plasma spraying method is adopted to prepare the rare-earth metal-molybdenum binary diffusion coating, and a post-treatment procedure is conducted on the diffusion coating. The obtained kovar alloy rare-earth metal-molybdenum binary diffusion coating is good in binding force and fine and smooth in appearance, can tolerate an atomic oxygen impact testand a high-low temperature impact test in a low-orbit space environment, and meets the requirements of comprehensive performance such as tensile strength. Experiments and tests prove the feasibilityof the process. According to the method, the supersonic plasma spraying technology is adopted to prepare the rare-earth metal-molybdenum binary diffusion coating on the surface of the kovar alloy, andthe method has the technical advantages that the process is simple, the cost is low, the zero pollution is realized, and the comprehensive effect of the coating is remarkable.

Description

technical field [0001] The invention belongs to the field of Kovar alloys, and relates to a binary coating, in particular to a preparation method for a rare earth metal-molybdenum binary coating on the surface of a Kovar alloy. Background technique [0002] Kovar alloy, a hard glass-iron-based sealing alloy containing 29% nickel and 17% cobalt, has good structural stability, electrical conductivity, welding and welding properties. The alloy has a linear expansion coefficient similar to that of hard glass in the range of 20-450 °C and the corresponding hard glass can be effectively sealed and matched. In addition, it has a high Curie point and good low-temperature structural stability. The oxide film of the alloy It is dense, easy to weld and weld, has good plasticity, can be cut and processed, and is widely used in the production of electric vacuum components, emission tubes, picture tubes, switching tubes, transistors, and sealed plugs and relay casings. In order to furthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/08C23C10/28
CPCC23C4/08C23C10/28C23C4/134
Inventor 宋瑞冯庆王宇飞贾波韩坤炎
Owner XIAN SEAL ELECTRONICS MATERIAL TECH CO LTD
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