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Preparation method of a niobium-based surface oxidation-resistant self-healing cr/nicr coating

An anti-oxidation and self-healing technology, which is applied in coating, metal material coating process, vacuum evaporation coating, etc., can solve the problems of lack of protection, damage to the performance of welding parts of structural parts, etc., and achieve the reduction of coating Structural defects, ensuring compactness and oxidation resistance, and reducing the effect of damage on the overall performance of the matrix

Active Publication Date: 2019-01-11
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under specific working conditions, niobium alloys are often welded with other heterogeneous materials as part of structural parts, and excessively high melting temperatures such as silicide and aluminide coatings will directly damage the performance of welded parts of structural parts
At the same time, the service temperature of the structural parts does not exceed 1000 °C, which is not enough to form a glassy dense oxide on the surface of the silicide and aluminide coatings. Therefore, the preparation of the above coatings on the surface of such parts cannot achieve due protection effect

Method used

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  • Preparation method of a niobium-based surface oxidation-resistant self-healing cr/nicr coating
  • Preparation method of a niobium-based surface oxidation-resistant self-healing cr/nicr coating
  • Preparation method of a niobium-based surface oxidation-resistant self-healing cr/nicr coating

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Effect test

Embodiment 1

[0027] The method for preparing the anti-oxidation self-healing Cr / NiCr coating on the surface of Nb-1Zr alloy in this embodiment comprises the following steps:

[0028] Step 1. Put the surface of the Nb-1Zr alloy into the vacuum chamber of the vacuum plasma physical vapor deposition equipment after surface pickling, polishing, sandblasting and ultrasonic anhydrous ethanol cleaning and drying, and argon gas is introduced into the vacuum chamber When the indoor air pressure is 0.05Pa, open the arc Cr target, and use the arc Cr target at a power density of 15W / cm 2 Cr ions produced by discharge under certain conditions carry out ion bombardment sputtering cleaning on the surface of the Nb-1Zr alloy; the bias voltage of the Nb-1Zr alloy during the ion bombardment sputtering cleaning process is -1200V, and the time for sputtering cleaning is 1min;

[0029] Step 2. After the ion bombardment and sputtering described in step 1 is completed, argon gas is introduced into the vacuum cha...

Embodiment 2

[0037] The method for preparing the oxidation-resistant self-healing Cr / NiCr coating on the surface of C103 niobium-hafnium alloy in this embodiment comprises the following steps:

[0038] Step 1. Place the surface of the C103 niobium-hafnium alloy in the vacuum chamber of the vacuum plasma physical vapor deposition equipment after surface pickling, polishing, sandblasting, ultrasonic anhydrous ethanol cleaning, and drying, and argon gas is introduced into the vacuum chamber When the indoor air pressure is 0.1Pa, open the arc Cr target, and use the arc Cr target at a power density of 5W / cm 2 Cr ions produced by discharge under certain conditions carry out ion bombardment sputtering cleaning on the surface of C103 niobium-hafnium alloy; in the ion bombardment sputtering cleaning process, the bias voltage of C103 niobium-hafnium alloy is -1000V, and the time of sputtering cleaning is 2min;

[0039] Step 2. After the ion bombardment and sputtering described in step 1 is cleaned, ...

Embodiment 3

[0047] The method for preparing the anti-oxidation self-healing Cr / NiCr coating on the surface of Nb-W alloy in this embodiment comprises the following steps:

[0048] Step 1. Put the surface of the Nb-W alloy in the vacuum chamber of the vacuum plasma physical vapor deposition equipment after surface pickling, polishing, sandblasting and ultrasonic anhydrous ethanol cleaning and drying, and argon gas is introduced into the vacuum chamber When the indoor air pressure is 0.01Pa, open the arc Cr target, and use the arc Cr target at a power density of 20W / cm 2 The Cr ions produced by the discharge under certain conditions carry out ion bombardment sputtering cleaning on the surface of the Nb-W alloy; the bias voltage of the Nb-W alloy during the ion bombardment sputtering cleaning process is -800V, and the time for sputtering cleaning is 3min; -W alloy temperature is room temperature 25°C;

[0049] Step 2. After the ion bombardment and sputtering described in step 1 is cleaned, ...

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Abstract

The invention discloses a preparation method for oxidation resisting self-healing Cr / NiCr coatings on a niobium-based surface. The preparation method comprises the following steps that (1) after a niobium matrix or a niobium alloy matrix is preprocessed, ion bombardment cleaning operation is conducted on the niobium-based metal surface by using Cr ions generated by a Cr target; (2) a Cr transition layer is deposited on the niobium-based metal surface by using the Cr ions generated by the electric arc Cr target; (3) a NiCr composite layer is deposited on the surface of the Cr transition layer by using Ni ions and the Cr ions generated by an electric arc Ni target and the electric arc Cr target correspondingly; (4) the operations of surface bombardment and sputtering are conducted on a NiCr middle composite layer by using the Cr ions generated by the electric arc Cr target; and (5) after the step (3) and step (4) are repeated at least three times, compact Cr / NiCr multi-layered composite coatings not less than 15 [mu]m in thickness are obtained on the niobium-based metal surface. According to the preparation method for the oxidation resisting self-healing Cr / NiCr coatings on the niobium-based surface, deposition of the coatings at a low temperature is guaranteed, the damages to matrix comprehensive performance caused by the technical parameter of coating preparation are lowered, and the compactness and good oxidation resistance of the coatings are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of coating material preparation, and in particular relates to a preparation method of a niobium-based surface oxidation-resistant self-healing Cr / NiCr coating. Background technique [0002] Niobium and niobium alloys have become important high-temperature structural candidate materials due to their high melting point, low density, good corrosion resistance, good machinability and excellent high-temperature mechanical properties, and are widely used in aerospace, nuclear industry and gas turbines and other main high-temperature structures Manufacture of components. However, the oxidation resistance of niobium and niobium alloy materials is extremely poor, and they begin to oxidize in the air at 180°C, and the "pest" harmful oxidation phenomenon occurs below 600°C, forming catastrophic powder oxidation, which seriously affects the material's high temperature and oxygen environment. Applications. Therefore, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/32C23C14/34C23C14/16C23C14/02
CPCC23C14/022C23C14/028C23C14/16C23C14/165C23C14/325C23C14/34
Inventor 王彦峰李争显杜继红王浩楠姬寿长张长伟
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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