Method for preparing SiAl coating by sintering slurry

A technology of slurry and coating, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem of high cost of arc deposition process, achieve the effect of reducing production cost, reducing cost and simplifying process

Inactive Publication Date: 2012-01-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The arc deposition process is costly

Method used

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  • Method for preparing SiAl coating by sintering slurry
  • Method for preparing SiAl coating by sintering slurry
  • Method for preparing SiAl coating by sintering slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The Ni-based superalloy K424 was used as the substrate, and the SiAl coating was prepared by slurry sintering. The process is as follows:

[0027] (1) Preparation of slurry: CrO 3 , MgO dissolved in phosphate aqueous solution to prepare binder. A slurry was prepared according to the ratio of 100ml binder: 100g powder, the Si content was 12%, and ball milled for 2 hours.

[0028] (2) Spray paint slurry: The surface of the alloy is shot blasted, cleaned with acetone and ultrasonic waves, and dried. Spray paint slurry and dry at 100°C for 30 minutes. Repeat spraying and drying 2 times. The final slurry thickness was made to be 0.3mm. Curing at 300°C for 30 minutes.

[0029] (3) Place the parts sprayed with paint slurry in an argon-protected diffusion furnace, and diffuse at 1000°C for 4 hours. After being released from the furnace, the parts are shot blasted to remove the residue of slurry bonded on the surface.

[0030] The coating microstructure is as figure 1 s...

Embodiment 2

[0032] The Ni-based superalloy K417 was used as the substrate, and the SiAl coating was prepared by slurry sintering. Technology is with embodiment 1. The thickness of the coating is 44.3 μm, which is NiAl phase. Si and Al contents are respectively: 5.12wt%, 25.15wt%. The coating is coated with 1%NaCl+99%Na 2 SO 4 (wt%) salt, the amount of salt applied is 1.5mg / cm 2, After 100 hours of hot corrosion test at 900℃, the oxide film thickness is 4.9μm, and the weight gain per unit area of ​​100h sample: 1.28mg / cm 2 .

Embodiment 3

[0034] The Ti-based superalloy TC4 was used as the substrate, and the SiAl coating was prepared by slurry sintering. The process is as follows:

[0035] (1) Preparation of slurry: CrO 3 , MgO dissolved in phosphate aqueous solution to prepare binder. A slurry was prepared according to the ratio of 100ml binder: 100g powder, the Si content was 15%, and ball milled for 2 hours.

[0036] (2) Spray paint slurry: The surface of the alloy is shot blasted, cleaned with acetone and ultrasonic waves, and dried. Spray paint slurry and dry at 100°C for 30 minutes. Repeat spraying and drying 2 times. The final slurry thickness was made 0.4 mm. Curing at 300°C for 30 minutes.

[0037] (3) Place the parts sprayed with paint slurry in an argon-protected diffusion furnace, and diffuse for 4 hours at 1050°C. After being released from the furnace, the parts are shot blasted to remove the residue of slurry bonded on the surface.

[0038] The thickness of the coating is 64.3 μm, which is ...

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Abstract

The invention discloses a method for preparing a SiAl coating by sintering slurry. The method comprises three processing steps: a processing step (1) of preparing SiAl slurry; a processing step (2) of spraying the slurry; and a processing step (3) of sintering treatment; the preparation of the SiAl slurry has the requirement that the components of the slurry are mixed according to the proportion of 80g-120g of permeated source powder to 100 ml of adhesive, wherein the permeated source powder adopts pure Al powder and Si powder, and the content of the Si powder is not more than 15wt%; the adhesive of the SiAl slurry is formed by mixing the following components: phosphate aqueous solution served as a solvent, CrO3 served as an acid inhibitor and MgO served as a curing agent. The SiAl coating prepared by the invention has good high-temperature corrosion resistance performance; and the process is simplified by a large margin, has low production cost and is remarkably superior to the prior art.

Description

technical field [0001] The invention relates to the technical field of surface coatings, and in particular provides a simple and practical method for preparing SiAl coatings by sintering slurry with good high-temperature corrosion resistance. Background technique [0002] Aeroengines and gas turbines and other hot-end components are required to work under high temperature and high stress, and the service environment is complex and harsh. The materials used must not only have a certain strength, but also have good high temperature corrosion resistance. In order to improve its service life, measures such as applying high-temperature protective coatings are generally adopted. At present, there are many types of high-temperature coatings. Although new coating systems are being extensively studied at home and abroad, aluminide coatings still account for more than 80% of the coating market. In order to improve the corrosion resistance of Al-infiltrated coatings, researchers intro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/34C23C10/52
Inventor 朱圣龙王福会鲁金涛辛丽王文
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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