Brazing method for DD5 single crystal alloy

A brazing method and alloy technology, which is applied in the field of brazing of DD5 single crystal alloys, can solve the problems that DD5 alloy connection technology has not been reported.

Inactive Publication Date: 2014-03-12
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the connection technology of DD5 alloy in China

Method used

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  • Brazing method for DD5 single crystal alloy
  • Brazing method for DD5 single crystal alloy
  • Brazing method for DD5 single crystal alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] according to figure 1 The DD5 alloy sample is processed, with a diameter of Φ13 and a length of 33mm. Each tensile sample is formed by butt brazing of two above-mentioned samples.

[0027] (1) Sample cleaning

[0028] The surface of the sample to be welded is mechanically polished to remove the surface scale, and then the sample to be welded is cleaned with gasoline and alcohol in sequence to remove oil and dirt on the surface of the sample.

[0029] (2) Sample assembly

[0030] On the special fixture, the samples are assembled and positioned by superalloy sheet and energy storage spot welding method to ensure that the brazing gap between the samples is 0.1mm.

[0031] (3) Apply paint

[0032] Firstly, the powdery B-Ni55NbCoWCrAlSiMoTi solder (-150 mesh to -300 mesh) is mixed with a binder to form a paste solder, and the binder accounts for 8%. Then put the solder paste into the applicator, and finally apply the solder paste to the sample to be welded, and the amoun...

Embodiment 2

[0039] according to figure 1 Processing DD5 alloy sample, diameter Φ13, length 33mm. Each tensile specimen is butt-brazed from two of the above specimens.

[0040] (1) Sample cleaning

[0041] The surface of the sample to be welded is mechanically polished to remove the surface scale, and then the sample to be welded is cleaned with gasoline and alcohol in sequence to remove oil and dirt on the surface of the sample.

[0042] (2) Sample assembly

[0043] On the special fixture, the samples are assembled and positioned by superalloy sheet and energy storage spot welding method to ensure that the brazing gap between the samples is 0.1mm.

[0044] (3) Apply paint

[0045] Firstly, powdery B-Ni55NbCoWCrAlSiMoTi solder (-150 mesh to -300 mesh) is mixed with a binder to form a paste solder, and the binder accounts for 10%. Then put the solder paste into the applicator, and finally apply the solder paste to the sample to be welded, and the amount of solder coating should be able...

Embodiment 3

[0052] according to figure 1 Processing DD5 alloy sample, diameter Φ13, length 33mm. Each tensile specimen is butt-brazed from two of the above specimens.

[0053] (1) Sample cleaning

[0054] The surface of the sample to be welded is mechanically polished to remove the surface scale, and then the sample to be welded is cleaned with gasoline and alcohol in order to remove oil and dirt on the surface of the sample.

[0055] (2) Sample assembly

[0056] On the special fixture, the samples are assembled and positioned by superalloy sheet and energy storage spot welding method to ensure that the brazing gap between the samples is 0.1mm.

[0057] (3) Apply paint

[0058]Firstly, the powdery B-Ni55NbCoWCrAlSiMoTi solder (-150 mesh to -300 mesh) is mixed with a binder to form a paste solder, and the binder accounts for 12%. Then put the solder paste into the applicator, and finally apply the solder paste to the sample to be welded, and the amount of solder coating should be able...

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Abstract

The invention discloses a razing method for DD5 single crystal alloy, and belongs to the technical field of brazing. The method is carried out according to the following steps of (1) cleaning a sample, (2) assembling the sample, (3) applying coating, (4) putting the sample with brazing filler metal applied into a constant temperature drying baker to be dried, and (5) carrying out vacuum brazing, putting the sample into a vacuum brazing furnace to carry out brazing, heating up to 500-550 DEG C with the speed of 5-20 DEG C/min, keeping the temperature for 10-30min, heating up to 1120-1160 DEG C with the speed of 5-20 DEG C/min, keeping the temperature for 10-30min, then heating up to 1200-1230 DEG C with the speed of 5-20 DEG C/min, keeping the temperature for 20-60min, carrying out furnace cooling to the temperature below 1000 DEG C, carrying out rapid cooling by charging 1-2 bar argon, and taking the sample out of the furnace after being cooled to the temperature below 80 DEG C. According to the razing method for the DD5 single crystal alloy, brazing connection of DD5 alloy turbine blades can be achieved, the strength of brazing connectors meets operating requirements, the average instant tensile strength of the DD5 alloy at the high temperature of 980 DEG C is 580 MPa after brazing heat circulation, compared with DD5 alloy technical conditions, the instant tensile strength is reduced by 17%, and the endurance property at the high temperature of 1093 DEG C meets requirements of technical conditions.

Description

technical field [0001] The invention belongs to the field of brazing technology, in particular to a brazing method for DD5 single crystal alloy. Background technique [0002] The hot-end components of an aero-engine are key components that serve under extreme environmental conditions. very high. DD5 single crystal alloy material has high thermal strength and good comprehensive performance, which can meet the requirements of hot end components. At present, there is no report on the connection technology of DD5 alloy in China. In order to meet the connection requirements of DD5 alloy, the research work on the brazing process of DD5 single crystal alloy was carried out. A nickel-based solder was used to carry out the brazing process test, and the brazing technology of DD5 alloy was mastered to realize the brazing connection of DD5 alloy. . [0003] For the connection technology of single crystal alloys, the general fusion welding process is adopted. During welding, the allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/19B23K1/20B23K35/30
CPCB23K1/008B23K1/19B23K1/20B23K1/206B23K35/3033B23K2103/08
Inventor 杜静金莹杨涧石李文学张磊先
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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