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Ablation-resistant and corrosion-resistant protective coating on surface of molybdenum metal mold core and 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 light density, poor plasticity, easy to warp, leaking core, eccentric core and broken core, etc. problem, to achieve the effect of low cost, good anti-corrosion ability, and avoid peeling off

Active Publication Date: 2020-12-04
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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  • Ablation-resistant and corrosion-resistant protective coating on surface of molybdenum metal mold core and preparation method
  • Ablation-resistant and corrosion-resistant protective coating on surface of molybdenum metal mold core and preparation method
  • Ablation-resistant and corrosion-resistant protective coating on surface of molybdenum metal mold core and 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 ablation-resistant and corrosion-resistant protective coating on the surface of a molybdenum metal mold core and a preparation method. At first, by means of an embedded dialysis technology, an aluminide coating is prepared on a pure molybdenum base body or a molybdenum alloy base body, then the aluminide coating is subjected to in-situ oxidation, thus an oxide / aluminidecomposite coating is prepared, the composite coating is composed of three phases alpha-Al2O3, Al8Mo3 and AlMo3, and the total thickness of the coating is 15-70 micrometers. A continuous compact alpha-Al2O3 layer is arranged on the outermost layer of the coating, and the remarkable ablation-resisting and corrosion-resisting protective effect on the molybdenum metal mold core can be achieved. Firm metallurgical bonding is formed between an aluminum oxide layer and an aluminide layer of the coating and between the aluminide layer and base body metal, and the situation that in the preparation anduse process, due to the stress effect, the coating is stripped and falls off can be effectively avoided.

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 Applications(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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