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A rhenium niobium brazing method

A brazing method and brazing technology are applied in the field of rhenium-niobium brazing, which can solve the problems of easy cracking and affect the working reliability of a rhenium-iridium engine, and achieve the effects of improving high-temperature mechanical properties and high tensile strength

Active Publication Date: 2022-06-03
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, fusion welding methods such as electron beam welding are mostly used for connecting rhenium and niobium. Due to the existence of a large number of brittle phases in the joint after welding, many cracks appear after welding, and cracks are very easy to occur, which makes the electron beam welding of rhenium and niobium very problematic. , which seriously affects the working reliability of the rhenium-iridium engine

Method used

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  • A rhenium niobium brazing method
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  • A rhenium niobium brazing method

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Embodiment 1

[0049] The embodiment of the present invention provides a rhenium niobium brazing connection method, which specifically includes the following steps:

[0050] 1. Solder configuration

[0051] The metal powder is weighed according to the following atomic mole fraction, and the particle size of the powder is 300 mesh:

[0052] Ti45%, Ni45%, Nb10%;

[0053] Pour the weighed powder into a ball-milling jar equipped with agate balls, and place the ball-milling jar on a ball mill for ball milling for 2-3h; obtain brazing filler metal for use;

[0054] 2. Brazing

[0055] The rhenium metal plate is used as the base and the niobium metal plate is used as the upper layer material, the substrate is placed horizontally, a layer of brazing filler metal with a thickness of 0.3 mm is laid on the upper surface of the substrate, and then the upper layer material is placed on the brazing filler metal to obtain the structure to be welded ;

[0056] Place the to-be-soldered at an air pressure...

Embodiment 2

[0060] The embodiment of the present invention provides a rhenium niobium brazing connection method, which specifically includes the following steps:

[0061] 1. Solder configuration

[0062] The surface oxide film was removed by grinding Ti foil, Ni foil and Nb foil with a thickness of 100 μm by 600-mesh sandpaper;

[0063] The metal foil after removing the surface oxide film is taken according to the following atomic mole fraction, and the initial thickness of the foil is 100 μm:

[0064] Ti 25%, Ni 45%, Nb 30%; finally take Ti1 layer, Ni 2 layer, Nb2 layer, stack each foil in the order of Ti-Ni-Nb-Ni-Nb, and press at 80 °C to 0.3 mm thick, and then cut to be consistent with the shape of the butt surface to obtain the brazing filler metal to be laid;

[0065] 2. Brazing

[0066] The rhenium metal is used as the base and the niobium metal plate is used as the upper material, the base is placed horizontally, a layer of brazing filler metal with a thickness of 0.3 mm is laid...

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Abstract

The invention relates to a rhenium-niobium brazing method, which belongs to the technical field of welding. The used brazing filler metal is formed by mixing Ti, Ni, and Nb three elements, wherein, the atomic mole fraction of Nb is not more than 30%. The rhenium-niobium brazing joint prepared by the brazing material provided by the invention can realize the reliable connection of rhenium and niobium, meet the reliability requirements of joint strength and airtightness, be applicable to the connection of the engine combustion chamber and the nested structure of the niobium transition ring, and meet the requirements of Long service life (>7h) of joints is required in high temperature environment of 1200°C, and the strength of joints at 1000°C is not less than 100MPa. The invention is applied to the connection between the rhenium-iridium engine combustion chamber, the injector and the expansion section, can effectively improve the reliability of the connection part of the rhenium-iridium engine, reduce the difficulty of welding the rhenium base material, and is of great significance for improving the working reliability of the engine.

Description

technical field [0001] The invention relates to a rhenium-niobium brazing method, which belongs to the technical field of welding. Background technique [0002] The rhenium-iridium engine thrust chamber uses rhenium as the base material and iridium as the coating. The refractory metal rhenium has good high-temperature mechanical properties and is suitable for use in ultra-high temperature and strong thermal shock environments. Niobium and niobium alloys are commonly used high-temperature matrix structural materials. The working temperature is not higher than 1500 °C. They are used as tail nozzle materials or nested transition ring materials in rhenium-iridium engines. The rhenium matrix and niobium alloys need to be welded. [0003] At present, fusion welding methods such as electron beam welding are mostly used for the connection of rhenium and niobium. Due to the existence of a large number of brittle phases in the joint after welding, many cracks appear after welding, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/00B23K1/20B23K35/32B23K35/30B23K103/18
CPCB23K1/0008B23K1/20B23K35/325B23K35/3033B23K2103/18Y02T10/12
Inventor 李夏明徐方涛闫旭波张绪虎
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH