Niobium alloy surface Ni-Cr oxidation-resistant coating and preparation method thereof

An anti-oxidation coating and niobium alloy technology, which is applied in the field of Ni-Cr anti-oxidation coating on the surface of niobium alloy and its preparation, can solve the problems of affecting the anti-oxidation performance of the coating, low coating temperature and high cost, and achieve excellent Anti-high temperature oxidation performance, effect of compact coating structure

Inactive Publication Date: 2015-05-27
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Problems solved by technology

For example, Chinese patent ZL200710192652.X discloses a method for preparing a niobium alloy high-temperature oxidation-resistant silicide coating. First, a 50-80 μm thick molybdenum layer is prepared by vacuum slurry sintering (sintering temperature 1450-1550 ° C), and then MoSi2 coating was prepared by infiltration and siliconization under air protection (infiltration temperature 1200-1300°C); patent application 201210237037.7 discloses a low-density niobium alloy high-temperature oxidation-resistant material and a method for preparing a high-temperature oxidation-resistant coating. Coating slurry of various alloying elements such as , Ti, Mo, etc. is coated on the substrate, and melted and fired for 10-30 minutes at a temperature of 1200-1350°C and a vacuum degree greater than 1×10-1Pa to obtain a high-temperature anti-oxidation Coating; Chinese patent ZL200710165074.0 discloses a high-temperature anti-oxidation material and coating preparation method, by coating the coating slurry containing Al, MoSi2, Ni, Mo, etc. on the substrate, at a temperature of 1350 ~ Melting at 1650°C and a vacuum greater than 1×10-1Pa for 5 to 30 minutes to form a high-temperature anti-oxidation coating with a thickness of 50-140 m

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  • Niobium alloy surface Ni-Cr oxidation-resistant coating and preparation method thereof
  • Niobium alloy surface Ni-Cr oxidation-resistant coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] Embodiment 1: Preparation of Ni-35Cr-10Nb coating on the surface of Nb-Zr alloy rod

[0021] Prepare a Nb-1Zr alloy rod with a length of 100 mm and a diameter of 10 mm. After degreasing with acetone, cleaning the surface, and pickling (the pickling process refers to the QJ2910-97 standard), electroplate Ni. The thickness of the Ni layer is about 10 μm, and then electroplate The Cr is about 8μm. After the plated niobium alloy rod is cleaned and dried, it is placed on the laser surface alloying treatment table. After testing, the pulse current is 160A, the pulse width is 2.5ms, the frequency is 8Hz, and the laser surface alloying line speed is 2.5 mm / s, the distance between the alloying tracks is 1.0mm. After the treatment, the sample is cut along the circumference of the alloy rod. After the sample is mounted, polished and corroded, it is placed under the Axiovert200MAT optical microscope for observation. The cross-sectional structure of the coating is as follows: Pictur...

Embodiment 2

[0022] Embodiment 2: Preparation of Ni-40Cr-5Nb coating on the surface of C-103 alloy pipe

[0023] Prepare a C-103 alloy (Nb-10Hf-Ti) tube with an outer diameter of 30 mm, a wall thickness of 3 mm, and a length of 100 mm. After the surface is cleaned and pickled, the outer surface is electroplated with Ni. The thickness of the Ni layer is about 90 μm, and then electroplated with Cr About 85μm, after cleaning and drying the plated niobium alloy rod, put it on the laser surface alloying treatment table. After testing, the pulse current is 280A, the pulse width is 3.0ms, the frequency is 6Hz, and the laser surface alloying line speed is 2mm / s, the distance between alloying tracks is 1.0 mm, and a coating with a thickness of about 180 μm and a coating composition close to Ni-40Cr-5Nb is prepared. The coating structure is uniform and dense, and it is well bonded to the substrate. The coating has a high Cr content and a good interface Bonding and coating compactness ensure good hi...

Embodiment 3

[0024] Embodiment 3: Ni-30Cr-5Nb coating is prepared on the surface of Cb752 alloy plate

[0025]Prepare a Cb752 alloy (Nb-10W-2.5Zr) plate with a size of 50mm×50mm×5mm. After surface cleaning and pickling, Ni is electroplated on the outer surface. The thickness of the Ni layer is about 100 μm, and then Cr is about 60 μm. After the niobium alloy rod was cleaned and dried, it was placed on the laser surface alloying treatment table. After testing, the pulse current was 260A, the pulse width was 3.5ms, the frequency was 10Hz, and the laser surface alloying line speed was 3.0mm / s. The spacing is 1.0 mm, and a coating with a thickness of about 170 μm and a coating composition close to Ni-30Cr-8Nb is prepared. The coating structure is uniform and dense, and it is well bonded to the substrate. The high Cr content in the coating and good interface bonding and dense coating It ensures the good high temperature oxidation resistance of the coating.

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Abstract

The invention relates to a niobium alloy surface Ni-Cr oxidation-resistant coating and its preparation method, and belongs to the field of a metal surface coating material and its preparation technology. The coating provided by the invention is composed of 30-40 wt% of Cr, 5-10 wt% of a niobium alloy and the balance Ni. The preparation method comprises the following steps: firstly, electroplating Ni on the surface of the niobium alloy; then, electroplating Cr; and finally, carrying out surface alloying by pulse YAG laser so as to obtain a Ni-Cr coating which is in complete metallurgical bonding to a matrix. By controlling thickness of the electroplated Ni layer and the electroplated Cr layer as well as the pulse YAG laser surface alloying technology, ingredients and thickness of the coating can be flexibly controlled. As content of Cr in the coating reaches 30-40 wt%, the coating has excellent resistance to high temperature oxidation.

Description

technical field [0001] The invention relates to a Ni-Cr anti-oxidation coating on the surface of a niobium alloy and a preparation method thereof, belonging to the technical field of metal surface coating materials and preparation thereof. Background technique [0002] Niobium alloy materials have good high-temperature strength and processing plasticity, and have become important high-temperature structural materials widely used in aviation, aerospace, nuclear industry and other fields. Severe oxidation occurs, which seriously restricts its application. At present, there are two main ways to improve the high-temperature oxidation resistance of niobium alloys: alloying and preparing anti-oxidation coatings on the surface. The alloying approach adds Ti, Al, Cr, Si and other elements to the niobium-based alloy, so that the alloy can self-generate an oxide protective film in high-temperature applications, thereby improving its oxidation resistance. This method usually sacrifice...

Claims

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Application Information

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IPC IPC(8): C22C19/05C25D5/12C25D5/48
Inventor 张永忠郭宏张习敏韩媛媛尹法章范叶明
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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