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Preparation method of refractory metal silicon boron coating

A technology of refractory metal and refractory alloy, applied in the field of preparation of refractory metal silicon boron coating, can solve the problems of oxide film peeling, coating oxide film crack, coating degradation, etc., achieves low cost and improves high temperature resistance. Oxidation, the effect of repairing microcracks

Inactive Publication Date: 2021-04-16
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the silicon-boron coating is working at high temperature, due to problems such as stress concentration at the corners of the prepared sample, the corners of the coating are prone to cracking and oxide film peeling, which affects the service life of the coating.
At present, silicon boron coating mainly adopts Al 2 o 3 As an inert filler embedded in the infiltration material, it cannot effectively solve the problems of cracks in the coating oxide film and coating degradation.

Method used

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  • Preparation method of refractory metal silicon boron coating
  • Preparation method of refractory metal silicon boron coating
  • Preparation method of refractory metal silicon boron coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Select Nb-Si-based alloy as the substrate, and cut the substrate into 10×10×Smm by wire cutting machine 3 After the block, the impurities and oxides on the surface of the substrate are removed by grinding, polishing and other methods.

[0032] (2) Choose Si and B with a purity of 99.9% as raw materials, NaF as an activator, and SiO with an average particle size of 20 μm 2 As an inert filler, this is the experimental group. The weight ratio of the powder material is: Si 34wt%, B 1wt%, NaF 3wt%, SiO 2 62 wt%. Put the powder into a ball mill and grind for 2h to ensure a homogeneous composition.

[0033] (3) Choose Si and B as raw materials, NaF as activator, traditional Al 2 o 3 The powder is used as an inert filler, and this is used as a control group to compare with the experimental group to compare the difference in high temperature oxidation resistance between the two. The weight ratio of the powder material is: Si 34wt%, B 1wt%, NaF 3wt%, Al 2 o 3 62 wt%...

Embodiment 2

[0043] (1) Select Mo as the matrix, and cut the matrix into After the block, the impurities and oxides on the surface of the substrate are removed by grinding, polishing and other methods.

[0044](2) Choose Si and B with a purity of 99.9% as raw materials, NaF as an activator, and SiO with an average particle size of 20 μm 2 As an inert filler, this is the experimental group. The weight ratio of the powder material is: Si 34wt%, B 1wt%, NaF 2.5wt%, SiO 2 62.5 wt%. Put the powder into a ball mill and grind for 2 hours to ensure uniform composition and obtain a mixed powder.

[0045] (3) Select Si and B with a purity of 99.9% as raw materials, NaF as an activator, and Al with an average particle size of 40 μm 2 o 3 The powder was used as an inert filler, and this was used as a control group. It is used to compare with the experimental group and compare the difference in high temperature oxidation resistance between the two. The weight ratio of the powder material is: S...

Embodiment 3

[0053] (1) Select Nb-Si-based alloy as the substrate, and cut the substrate into 10×10×8mm by wire cutting machine 3 After the block, the impurities and oxides on the surface of the substrate are removed by grinding, polishing and other methods.

[0054] (2) Prepare Mo layer on Nb-Si based alloy. A Mo layer with a thickness of about 90 μm was prepared on the Nb-Si based alloy by thermal spraying.

[0055] (3) Choose Si and B with a purity of 99.9% as raw materials, NaF as an activator, and SiO with an average particle size of 20 μm 2 As an inert filler, this is the experimental group. The weight ratio of the powder material is: Si 33wt%, B 1wt%, NaF 2.5wt%, SiO 2 63.5 wt%. Put the powder into a ball mill and grind for 2 hours to ensure uniform composition and obtain a mixed powder.

[0056] (4) Select Si and B with a purity of 99.9% as raw materials, NaF as an activator, and Al with an average particle size of 40 μm 2 o 3 The powder was used as an inert filler, and thi...

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Abstract

The invention discloses a preparation method of a refractory metal silicon boron coating, which comprises the following steps: (1) putting Si powder, B powder, NaF and SiO2 into a ball mill, and carrying out ball milling to obtain mixed powder; and (2) under the protection of inert gas, putting the mixed powder and a refractory metal matrix or refractory alloy matrix in a high-temperature tubular furnace, and preparing the silicon-boron coating through embedding infiltration. The method is simple, practical and low in cost, and the high-temperature oxidation resistance of the silicon-boron coating prepared on the refractory metal through the embedding method can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of metal coating preparation, and in particular relates to a preparation method of a refractory metal silicon boron coating. Background technique [0002] High-temperature protective coatings play an important role in the oxidation protection of aero-engine and aero-turbine blades. When the silicon-boron coating is in a high-temperature environment, it can form a low-viscosity borosilicate glass layer on the coating surface, fill the cracks and holes formed on the coating surface, and provide the coating with self-healing ability. Therefore, silicon-boron coating is considered to be one of the most promising anti-oxidation protective coatings. [0003] In the prior art, embedding infiltration has the advantages of simple operation, high deposition efficiency, and low preparation cost, and is one of the effective technologies for preparing silicon-boron coatings. When the silicon-boron coating is operated a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/52C23C10/02B22F9/04
Inventor 苏琳芬杨建勇卓冠群
Owner HUAQIAO UNIVERSITY
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