Surface cleaning method before brazing repairing of single crystal turbine guide vane crack

A technology for turbine guide vanes and surface cleaning, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve problems such as unreported surface cleaning methods of the system, reduce the risk of recrystallization, improve mechanical properties, and improve quality. Effect

Inactive Publication Date: 2019-03-08
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the surface cleaning method of the DD5 and Rene N5 single crystal turbine guide vane crack before brazing repair system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Sand blowing treatment: use a wet sand blowing machine, under a pressure of 0.3-0.4 MPa, use corundum with a particle size of less than 154 μm to perform sand blowing treatment on the guide vane to remove the oxide skin and carbon deposit on the surface of the blade after service; Blow the blades with low pressure and finer sand, and the sand blowing time at the same position shall not exceed 2 minutes;

[0035] (2) Chemical cleaning: using KMnO 4 + NaOH mixed solution to chemically clean the leaves, the solution concentration is KMnO 4 Content 30g / L, NaOH content 50g / L, solution temperature 75°C, stir properly, soak for 30 minutes, take out the guide vane, and rinse with a water gun; repeat cleaning depending on the surface of the vane, and the number of repeated cleaning should not exceed 3 times; immerse in a hot water tank Rinse and heat to 70°C; after rinsing, dry the moisture on the surface of the guide with compressed air, and put it in an oven at 100°C for ...

Embodiment 2

[0040] (1) Sand blowing treatment: use a wet sand blowing machine, under a pressure of 0.3-0.4 MPa, use corundum with a particle size of less than 154 μm to perform sand blowing treatment on the guide vane to remove the oxide skin and carbon deposit on the surface of the blade after service; Blow the blades with low pressure and finer sand, and the sand blowing time at the same position shall not exceed 2 minutes;

[0041] (2) Chemical cleaning: using KMnO 4 + NaOH mixed solution to chemically clean the leaves, the solution concentration is KMnO 4 Content 40g / L, NaOH content 60g / L, solution temperature 80°C, stir properly, soak for 30 minutes, take out the guide vane, and rinse with a water gun; repeat cleaning depending on the surface condition of the vane, and the number of repeated cleaning should not exceed 3 times; immerse in a hot water tank Rinse and heat to 75°C; after rinsing, dry the moisture on the surface of the guide with compressed air, and put it in an oven at ...

Embodiment 3

[0046] (1) Sand blowing treatment: use a wet sand blowing machine, under a pressure of 0.3-0.4 MPa, use corundum with a particle size of less than 154 μm to perform sand blowing treatment on the guide vane to remove the oxide skin and carbon deposit on the surface of the blade after service; Blow the blades with low pressure and finer sand, and the sand blowing time at the same position shall not exceed 2 minutes;

[0047] (2) Chemical cleaning: use Androx 6333A solution to chemically clean the blades, the solution temperature is 80°C, stir properly, soak for 15 minutes, take out the guide blades, and rinse with a water gun; repeat cleaning depending on the surface of the blades, and the number of repeated cleanings should not exceed 3 times; immerse in hot water tank for rinsing and heat to 75°C; after rinsing, use compressed air to dry the moisture on the surface of the guide and put it in an oven at 100°C for 30 minutes;

[0048] (3) Removal of aluminized coating: the prote...

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PUM

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Abstract

The invention relates to a surface cleaning method before brazing repairing of a single crystal turbine guide vane crack. The surface cleaning method before brazing repairing of the single crystal turbine guide vane crack is characterized in that a method combining physics and chemistry is adopted to remove a carbon deposition layer and an aluminizing layer on the surface of a vane, to remove an oxidation film on the surface of the crack and to provide a clean surface for final brazing repairing. The surface cleaning method comprises the steps of (1) sand blasting treatment, (2) chemical cleaning, (3) aluminized coating stripping, (4) gas phase fluorinion cleaning, and (5) vacuum purification treatment. The surface cleaning method before brazing repairing of the single crystal turbine guide vane crack is suitable for an alitizing single crystal high temperature alloy turbine guide vane, the vane after being cleaned through the surface cleaning method has a good brazing repairing effect, and a repaired vane body has no recrystallization; the surface cleaning technical problem of single crystal high temperature alloy turbine guide vane non-recrystallization repairing is solved, and conspicuous innovativeness is achieved.

Description

technical field [0001] The invention belongs to the technical field of aero-engine and ground gas turbine repair, and relates to a method for cleaning the surface of a single-crystal turbine guide vane before crack brazing repair. The present invention is aimed at aeroengines and ground gas turbine single crystal superalloy turbine guide vanes that have cracks after service, and performs surface area carbon cleaning, crack surface oxide film fluoride ion cleaning, vacuum purification treatment and removal of aluminized coating, and is used for subsequent brazing. Weld repairs provide surface preparation. Background technique [0002] With the continuous improvement of the performance requirements of aero-engines and ground gas turbines, a large number of single-crystal superalloy materials have been used in the manufacture of turbine blades. Turbine blades are the core components of aero-engines and ground-based gas turbines. They work in a high-temperature gas atmosphere a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/20B23K1/00
CPCB23K1/0008B23K1/206
Inventor 张元伟赵海生毛唯张学军潘晖程耀永熊华平
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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