Anti-oxidation coating for rhenium spray pipe, preparation method of anti-oxidation coating and rhenium-anti-oxidation coating spray pipe

An anti-oxidation coating and nozzle technology, applied in the coating, metal material coating process, gaseous chemical plating and other directions, can solve the coating thickness control, measurement and coating quality inspection difficult to achieve, deposition efficiency utilization rate It is not high, the deposition quality is difficult to control, etc., to achieve the effect of improving the structure and mechanical properties, controllable thickness uniformity, and uniform and controllable coating thickness

Active Publication Date: 2020-07-14
SINO PLATINUM METALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CVD is widely used to prepare iridium coatings by thermal decomposition of iridium precursor compounds (such as iridium acetylacetonate). The advantage of this method is that the obtained coatings have high density, but there are disadvantages of slow deposition rate and high cost. The arc deposition iridium process is a physical vapor deposition (PVD) method. The advantage of this method is that the deposition rate is fast, but because the iridium coating is deposited on the inner surface of the rhenium nozzle, the coating thickness control, measurement and coating quality inspection are difficult. Realization, the deposition efficiency and the utilization rate of the iridium target are not high; the molten salt electrodeposition of iridium, the advantage is that the deposition rate is fast, the disadvantage is that the deposition quality is difficult to control, and the reproducibility is poor

Method used

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  • Anti-oxidation coating for rhenium spray pipe, preparation method of anti-oxidation coating and rhenium-anti-oxidation coating spray pipe
  • Anti-oxidation coating for rhenium spray pipe, preparation method of anti-oxidation coating and rhenium-anti-oxidation coating spray pipe
  • Anti-oxidation coating for rhenium spray pipe, preparation method of anti-oxidation coating and rhenium-anti-oxidation coating spray pipe

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preparation example Construction

[0036] The invention provides a preparation method of an anti-oxidation coating for a rhenium nozzle, comprising the following steps:

[0037] Melting the iridium to obtain a cylindrical ingot;

[0038] Hot forging the cylindrical ingot to obtain a billet, the starting temperature of the hot forging is 1600-1800°C, the final forging temperature is 1400-1500°C, and the total processing deformation is not less than 60%;

[0039] performing surface treatment on the billet to remove impurities to obtain a treated billet;

[0040] Hot isostatic pressing is performed on the processed billet to obtain a bar. The conditions of the hot isostatic pressing are as follows: vacuumize and fill with argon, the temperature is 1500-1600°C, the pressure is 100-120MPa, the time for 2h;

[0041] The rod is machined to obtain the anti-oxidation coating for the rhenium nozzle.

[0042] In the invention, the iridium is smelted to obtain a cylindrical billet. The present invention has no special ...

Embodiment 1

[0063] A preparation method for anti-oxidation coating (iridium-rhodium alloy coating) for rhenium nozzle, comprising the following steps:

[0064] (1) According to the composition of Ir-30Rh alloy, 150g of ingredients is distributed, and the ingredients are evenly divided into 5 parts, each of which is 30g. Use an electric arc furnace to melt each ingredient into a small ingot, put 5 small ingots in an intermediate frequency furnace for vacuum melting, and cast them into a Φ18mm cylindrical ingot;

[0065] (2) Put the Ir-30Rh alloy ingot into the high-temperature vacuum tungsten wire furnace, and the system is vacuumed to 2×10 -3 Pa starts to heat up, and then cools down after homogenizing heat treatment at a temperature of 1800°C for 2 hours;

[0066] (3) Put the Ir-30Rh alloy ingot into a magnesia crucible, use oxygen-acetylene to heat the ingot to 1700°C and start forging, use a circular die to carry out hot forging on the alloy ingot, when the temperature of the rod drop...

Embodiment 2

[0072] A preparation method for anti-oxidation coating (iridium-rhodium alloy coating) for rhenium nozzle, comprising the following steps:

[0073] (1) According to the composition of Ir-15Rh alloy, 1000g of ingredients is distributed, and the ingredients are evenly divided into 10 parts, each of which is 100g. Use an electric arc furnace to melt each ingredient into a small ingot, put 10 small ingots in an intermediate frequency furnace for vacuum melting, and cast them into a Φ46mm cylindrical ingot;

[0074] (2) Put the Ir-15Rh alloy ingot into a high-temperature vacuum tungsten wire furnace, and the system is vacuumed to 2×10 -3 Pa starts to heat up, and then cools down after homogenizing heat treatment at a temperature of 2000°C for 4 hours;

[0075] (3) Put the Ir-15Rh alloy ingot into a magnesia crucible, use oxygen-acetylene to heat the ingot to 1800°C, and start forging. Use a circular die to carry out hot forging on the alloy ingot. When the temperature of the rod d...

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Abstract

The invention provides an anti-oxidation coating for a rhenium spray pipe, a preparation method of the anti-oxidation coating and a rhenium-anti-oxidation coating spray pipe, and belongs to the technical field of coating preparation. The anti-oxidation coating has high compactness and component uniformity. Smelting is a traditional method commonly adopted for preparing precious metal materials andhas the advantages of being high in preparation speed, mature in process and simple in equipment. According to the anti-oxidation coating for the rhenium spray pipe, the preparation method of the anti-oxidation coating and the rhenium-anti-oxidation coating spray pipe, through smelting pre-alloying, homogenizing heat treatment, hot forging and hot isostatic pressing, materials are further homogenized and densified, and the high-density coating materials with the relative density exceeding 99.9% can be obtained; and the coating is prepared through machining, machining the thickness and the machining precision of the coating completely according to drawing design requirements is carried out, so that the thickness uniformity is controllable, and the size precision can reach + / -10 microns.

Description

technical field [0001] The invention relates to the technical field of coating preparation, in particular to an anti-oxidation coating for a rhenium nozzle, a preparation method thereof, and a rhenium-anti-oxidation coating nozzle. Background technique [0002] Low-thrust aerospace engines are mainly used for attitude and orbit control of spacecraft. The performance of the engine mainly depends on its operating temperature. Therefore, increasing the operating temperature of the engine is of great significance to the improvement of engine performance, and the operating temperature is determined by the temperature resistance of the engine thruster (nozzle) material. With the further development of aerospace technology The development of the engine puts forward higher requirements on the performance of the engine, and the working temperature needs to reach above 1800 ℃. Rhenium is a rare metal with a high melting point in a close-packed hexagonal structure. It has excellent co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/04C22C1/02C22F1/14C22F1/02C23C16/14
CPCC22C1/02C22C5/04C22F1/02C22F1/14C23C16/14
Inventor 胡昌义魏燕蔡宏中刘俊陈力周利民闻明张诩翔崔浩张贵学柳森吴霏汪星强
Owner SINO PLATINUM METALS CO LTD
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