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A hot isostatic pressing-brazing composite forming method for thin-walled structures

A thin-walled structure, hot isostatic pressing technology, used in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problem of the influence of the substrate itself, high temperature, and achieve good connection performance, less macrosegregation, and uniform organization. Effect

Active Publication Date: 2020-09-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temperature required for direct diffusion bonding by hot isostatic pressing is high, which affects the material of the substrate itself, thus limiting its application. In order to reduce the temperature required for diffusion bonding and obtain a good connection interface, this paper is proposed. Invented processing method

Method used

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  • A hot isostatic pressing-brazing composite forming method for thin-walled structures
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  • A hot isostatic pressing-brazing composite forming method for thin-walled structures

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Embodiment 1

[0045] In this example, TC4 alloy material is used as the base material. Due to the excellent performance of titanium alloy, it is widely used in aerospace and civil fields. Since the temperature of the TC4 phase transition point is 950-990°C, the solder system is Ti-Zr-Cu-N, the melting temperature is 770-820°C, the temperature of the hot isostatic pressing diffusion connection is 800°C, and the pressure is 20Mpa. According to the above parameters, the method of the present invention is used to form flat thin-walled parts with tiny flow channels. Specific steps are as follows:

[0046] 1. Design the corresponding hot isostatic pressing process plan according to the structure of the parts to be formed. Since hot isostatic pressing is used for diffusion connection, the material matrix itself can be used as a jacket for transmitting pressure and temperature. According to the structure of the parts, process the plates that need to be diffused and connected;

[0047] 2. Clean, g...

Embodiment 2

[0054] With the development of aerospace technology, the thrust-to-weight ratio of aeroengines is increasing, and the inlet temperature is also increasing. Nickel-based alloy is an excellent high-temperature alloy. More than 50% of modern gas turbine engines use high-temperature alloys, of which nickel-based materials account for about 40%. Nickel-based alloys are commonly used as materials for engine hot-end parts, and have excellent comprehensive properties under medium and high temperature conditions. As the power source of the engine, the combustion chamber has the most harsh working environment and high ambient temperature, so effective cooling is particularly important. Using thin-walled materials with a pipe structure as the inner wall of the combustion chamber can improve the cooling effect. In this example, Inconel718 high-temperature nickel-based alloy is used. Since the melting point of nickel-based superalloy is high, the temperature of hot isostatic pressing diffu...

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Abstract

The invention belongs to the field of hot isostatic pressing and welding, and discloses a thin-wall structure hot isostatic pressing-brazing composite forming method. The method comprises the following steps that (a) brazing filler metal is selected, the surfaces of a to-be-connected thin-wall structure piece and a core are cleaned, the brazing filler metal, and the thin-wall structure piece and the core are stacked, wherein the brazing filler metal is placed between the thin-wall structure piece and the core; and (b) after stacking, the to-be-connected thin-wall structure piece, the core andthe brazing filler metal are subjected to hot isostatic pressing treatment, in the process, interatomic diffusion is conducted between the to-be-connected thin-wall structure piece and the brazing filler metal as well as between the core and the brazing filler metal, and the to-be-connected thin-wall structure piece, the core and the brazing filler metal are connected with one another. Through themethod, the thin-wall structure piece is connected with the core at the low temperature, the joint is uniform in structure, and macrosegregation is small.

Description

technical field [0001] The invention belongs to the field of hot isostatic pressing and welding, and more specifically relates to a hot isostatic pressing-brazing composite forming method for thin-walled structures. Background technique [0002] With the rapid development of aerospace technology, the requirements for materials in some key parts are becoming more and more stringent. Due to long-term work in a relatively high temperature environment, materials are required to have good high-temperature strength and fatigue properties to ensure the safety of aerospace equipment sex and stability. [0003] The aerospace engine is the "heart" of the rocket. Its turbine, casing and other key components have complex structures, and the materials are difficult to process, which makes forming and manufacturing difficult. With the continuous development of aerospace technology, the requirements for the thrust-to-weight ratio of the engine continue to increase, which further increases...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/02
Inventor 魏青松滕庆孙闪闪蔡超史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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