Method for brazed connection of DD98M single-crystal high-temperature alloy by Pd-Si composite solder

A technology of DD98M and superalloy, applied in welding medium, welding equipment, metal processing equipment, etc., can solve the problems of complex cavity structure, difficult core direct casting, etc., achieve excellent performance, promote the improvement of manufacturing level, and stable performance Effect

Active Publication Date: 2018-06-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the single crystal blade adopts a composite cooling hollow structure, the internal cavity structure is extremely complex, and it is difficult to cast directly with the core. Usually, the two-half split

Method used

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  • Method for brazed connection of DD98M single-crystal high-temperature alloy by Pd-Si composite solder
  • Method for brazed connection of DD98M single-crystal high-temperature alloy by Pd-Si composite solder

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: Taking Pd-Si composite solder as an example to connect DD98M single crystal and DD98M single crystal at a brazing temperature of 1060°C and a temperature of 60 minutes, the specific implementation process is as follows:

[0029] 1) Soak the DD98M single crystal superalloy in alcohol and ultrasonically remove the oil stains, then use 400#, 600#, 1000#, 1500# sandpaper to polish the surface to be connected, and then polish until there is no obvious scratch on the surface to be connected;

[0030] 2) Select Pd foil with a thickness of 0.025mm and a purity of 99.9% and Si powder with a particle size of 600 mesh and a purity of 99.99% as solder, cut two pieces of Pd foil with the same shape as the surface to be connected, and weigh them with an analytical balance Si powder, control the mass ratio of Pd and Si in the solder to be 20:1;

[0031] 3) According to the order of DD98M-Pd-Si-Pd-DD98M, firstly paste a piece of Pd foil on the surface to be connected of DD98...

Embodiment 2

[0038] Example 2: Taking the use of Pd-Si composite solder as an example to connect DD98M single crystal and DD98M single crystal at a brazing temperature of 1060°C and heat preservation for 30 minutes, the specific implementation process is as follows:

[0039] 1) Soak the DD98M single crystal superalloy in alcohol and ultrasonically remove the oil stains, then use 400#, 600#, 1000#, 1500# sandpaper to polish the surface to be connected, and then polish until there is no obvious scratch on the surface to be connected;

[0040] 2) Select Pd foil with a thickness of 0.025mm and a purity of 99.9% and Si powder with a particle size of 600 mesh and a purity of 99.99% as solder, cut two pieces of Pd foil with the same shape as the surface to be connected, and weigh them with an analytical balance Si powder, control the mass ratio of Pd and Si in the solder to be 20:1;

[0041]3) According to the order of DD98M-Pd-Si-Pd-DD98M, firstly paste a piece of Pd foil on the surface to be co...

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Abstract

The invention relates to a method for brazed connection of DD98M single-crystal high-temperature alloy by Pd-Si composite solder. The method includes the steps that foil-type Pd and powdered Si with the fixed mass ratio are selected as the Pd-Si composite solder, DD98M, the foil-type Pd and the powdered Si are assembled according to the sequence of DD98M-Pd-Si-Pd-DD98M, and then a product is placed into a vacuum brazing furnace to be heated and brazed; and cooling is carried out after brazing is finished, Pd4Si, a Ni-based solid solution, Al2Pd5 and other structures are formed in soldering seams in the cooling stage, and thus connection of the DD98M single-crystal high-temperature alloy is achieved. By means of the soldering technology, the room-temperature shearing strength of an obtainedjoint is 338 Mpa, the shear strength is 328 Mpa after heat treatment at the high temperature of 700 DEG C for 240h, and actual using requirements are met. By means of the brazing technology, high-quality connection of aero-engine turbine single-crystal blades is achieved, and the method has the advantages that damage to mother materials is small, the joint strength is high, and the joint can be stably used at the high temperature of 700 DEG C; and the aero-engine manufacturing level is improved to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of brazing connection, and in particular relates to a method for brazing and connecting DD98M single crystal superalloy by using Pd-Si composite solder. The method can obtain joints used stably at high temperatures. Background technique [0002] An aero-engine is a thermodynamic machine that provides power for an aircraft. It has a highly complex structure, and its manufacturing level directly affects the performance and stability of the aircraft. In order to increase the inlet temperature and thus increase the thrust-to-weight ratio, the material of the turbine blade, one of its important components, is currently mainly nickel-based single crystal superalloy, such as DD98M. Since the single crystal blade adopts a composite cooling hollow structure, the internal cavity structure is extremely complex, and it is difficult to cast directly with the core. Usually, the two-half split or combined hollow blade meth...

Claims

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Application Information

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IPC IPC(8): B23K1/00B23K1/008B23K1/20B23K35/26B23K35/36
CPCB23K1/0008B23K1/008B23K1/20B23K1/206B23K35/268B23K35/3607
Inventor 贺艳明高科何华敏杨建国高增梁武宏科
Owner ZHEJIANG UNIV OF TECH
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