A kind of anti-ablation and anti-corrosion protective coating on the surface of molybdenum metal core and its preparation method

A protective coating, molybdenum metal technology, applied in metal material coating process, metal processing equipment, coating and other directions, can solve the problem of poor plasticity, prone to warpage, leaking core, eccentric core and broken core, light density, etc. problem, to achieve the effect of low cost, avoid peeling off, good anti-corrosion ability

Active Publication Date: 2021-08-06
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

Ceramic materials have the disadvantages of poor plasticity and light density. The thin-walled and irregular-shaped cores made of ceramic materials are extremely prone to casting defects such as warping, core leakage, partial core and broken core during the casting process.

Method used

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  • A kind of anti-ablation and anti-corrosion protective coating on the surface of molybdenum metal core and its preparation method
  • A kind of anti-ablation and anti-corrosion protective coating on the surface of molybdenum metal core and its preparation method
  • A kind of anti-ablation and anti-corrosion protective coating on the surface of molybdenum metal core and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing a protective coating on the surface of a molybdenum metal core, the substrate is pure molybdenum, comprising the following steps:

[0036] Step 1: Pretreatment of molybdenum metal core substrate:

[0037] (1) Grind the molybdenum metal substrate step by step with 240#, 400#, 600#, 800# sandpaper.

[0038] (2) The polished substrate was ultrasonically cleaned with absolute ethanol for 10 minutes, and then dried.

[0039] Step 2: Prepare embedding seepage material:

[0040] Prepare the embedding material, each 100g of the embedding material includes 2g of Al powder with a particle size of 500 mesh and a purity of not less than 99.9%, and 2g of NH with a particle size of 100 mesh and a purity of not less than 99.5% 4 Cl powder and the remaining Al with a particle size of 300 mesh and a purity of not less than 99.85% 2 o 3 pink.

[0041] Step 3: Embedding aluminizing:

[0042] (1) Fill the bottom of the crucible with the embedding material obtai...

Embodiment 2

[0051] A method for preparing a protective coating on the surface of a molybdenum metal core, the substrate is pure molybdenum, comprising the following steps:

[0052] Step 1: Pretreatment of molybdenum metal core substrate:

[0053] (1) Grind the molybdenum metal substrate step by step with 240#, 400#, 600#, 800# sandpaper.

[0054] (2) The polished substrate was ultrasonically cleaned with absolute ethanol for 10 minutes, and then dried.

[0055] Step 2: Prepare embedding seepage material:

[0056] Prepare the embedding material, each 100g of the embedding material includes 4g of Al powder with a particle size of 500 mesh and a purity of not less than 99.9%, 2g of NH with a particle size of 100 mesh and a purity of not less than 99.5% 4 Cl powder and the remaining Al with a particle size of 300 mesh and a purity of not less than 99.85% 2 o 3 pink.

[0057] Step 3: Embedding aluminizing:

[0058] (1) Fill the bottom of the crucible with the embedding material obtained ...

Embodiment 3

[0067] A method for preparing a protective coating on the surface of a molybdenum metal core, the substrate is pure molybdenum, comprising the following steps:

[0068] Step 1: Pretreatment of molybdenum metal core substrate:

[0069] (1) Grind the molybdenum metal substrate step by step with 240#, 400#, 600#, 800# sandpaper.

[0070] (2) The polished substrate was ultrasonically cleaned with absolute ethanol for 10 minutes, and then dried.

[0071] Step 2: Prepare embedding seepage material:

[0072] Prepare the embedding material, each 100g of the embedding material includes 1g of Al powder with a particle size of 500 mesh and a purity of not less than 99.9%, and 1g of NH with a particle size of 100 mesh and a purity of not less than 99.5% 4 Cl powder and the remaining Al with a particle size of 300 mesh and a purity of not less than 99.85% 2 o 3 pink.

[0073] Step 3: Embedding aluminizing:

[0074] (1) Fill the bottom of the crucible with the embedding material obtai...

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Abstract

The invention discloses an anti-ablation and anti-corrosion protective coating on the surface of a molybdenum metal core and a preparation method thereof. First, an aluminide coating is prepared on a pure molybdenum or molybdenum alloy substrate by an embedding infiltration process, and then the aluminide coating is oxidized in situ to obtain an oxide / aluminide composite coating: the composite coating by α‑Al 2 o 3 、Al 8 Mo 3 、AlMo 3 Composed of three phases; the total thickness of the coating is 15-70 μm; the outermost layer of the coating is continuous and dense α-Al 2 o 3 layer, which can play a significant anti-ablation and anti-corrosion protection effect on the molybdenum metal core; a strong metallurgical bond is formed between the alumina layer and the aluminide layer of the coating, and between the aluminide layer and the base metal , which can effectively prevent the coating from peeling off due to stress during preparation and use.

Description

technical field [0001] The invention relates to a molybdenum metal core surface protective coating and a preparation method, in particular to a molybdenum metal core surface anti-ablation anti-melting protective coating and a preparation method. Background technique [0002] With the continuous development of the aviation industry and the continuous improvement of aviation technology, countries all over the world are competing to develop aero-engines with high thrust-to-weight ratio. During the development of aero-engines, increasing the turbine inlet temperature is the most effective way to increase the thrust-to-weight ratio of aero-engines. The increase of turbine inlet temperature depends on three key technologies, namely high temperature resistant alloy technology represented by superalloy technology, thermal barrier coating technology and hollow turbine blade air cooling technology. Among them, the hollow turbine blade air cooling technology has developed from the ear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22C9/10C23C10/48C23C8/12C23C12/00
CPCB22C3/00B22C9/101C23C8/12C23C10/48C23C12/00
Inventor 刘恩泽郑力玮郑志佟健宁礼奎谭政张冲
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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