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Rhenium niobium brazing method

A brazing method and brazing technology, which is applied in the field of rhenium-niobium brazing, can solve problems such as easy cracking and affecting the working reliability of rhenium-iridium engines, and achieve the effect of improving high-temperature mechanical properties and high tensile strength

Active Publication Date: 2019-12-06
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Rhenium niobium brazing method

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Embodiment 1

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

[0050] 1. Brazing material configuration

[0051] Weigh the metal powder 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 mill jar equipped with agate balls, place the ball mill jar on a ball mill for ball milling for 2-3 hours; obtain the 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 material, and the base is placed horizontally, and a layer of solder with a thickness of 0.3mm is laid on the upper surface of the base, and then the upper material is placed flat on the solder to obtain the structure to be welded ;

[0056] The air pressure to be welded is 8×10 -3 Pa, the temperature is 1050° C., and...

Embodiment 2

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

[0061] 1. Brazing material configuration

[0062] Polish the Ti foil, Ni foil and Nb foil with a thickness of 100 μm through 600-mesh sandpaper to remove the surface oxide film;

[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 the Ti1 layer, Ni 2 layer, Nb2 layer, stack each foil in the order of Ti-Ni-Nb-Ni-Nb, and press it to 0.3 at 80°C mm thick, and then cut it to be consistent with the shape of the butt joint surface to obtain the brazing material to be laid;

[0065] 2. Brazing

[0066] The rhenium metal is used as the substrate and the niobium metal plate is used as the upper layer material, the substrate is placed horizontally, a layer of brazing material ...

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Abstract

The invention relates to a rhenium niobium brazing method, and belongs to the technical field of welding. A filler metal is composed of Ti, Ni and Nb, where an atomic mole fraction of Nb is less thanor equal to 30%. A rhenium niobium brazed joint prepared with the filler metal provided by the rhenium niobium brazing method can realize the reliable connection of the rhenium niobium, meet the reliability requirements of joint strength and air tightness, be applicable to the connection of an engine combustion chamber and a niobium transition ring nesting structure, meet the service requirementsof joint long life (> 7h) under high temperature environment of 1200 DEG C, and realize that the joint strength is not less than 100MPa at 1000 DEG C. The rhenium niobium brazing method is applied tothe connection between the combustion chamber of the rhenium iridium engine, an injector and the expansion section, can effectively improve the reliability of the connection part of the rhenium iridium engine, reduce the welding difficulty of rhenium base materials, and has important 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] Rhenium-iridium engine thrust chamber, rhenium is used as the base material, and iridium is used as the coating. Among them, 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 structure materials, and 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 during application. [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, ma...

Claims

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Application Information

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Patent Type & Authority Applications(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