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Ir-X coating based on surface alloying modification and preparation method thereof

A surface alloying and coating technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of limited application, no plasma effect, limited static oxidation resistance, etc. Controllable, good binding, surface temperature reduction effect

Inactive Publication Date: 2018-02-27
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This effect makes the surface temperature of iridium much higher than that of most ceramic materials under the same aerodynamic environment, which severely limits its application
So far, no reports have been found on ultra-high temperature oxidation-resistant coatings using iridium as an oxygen barrier layer in aerodynamic environments. All reports on iridium and iridium surface modification are limited to static anti-oxidation performance, and the temperature is far from reaching hypersonic speed. The service environment of the aircraft, without the effect of plasma

Method used

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  • Ir-X coating based on surface alloying modification and preparation method thereof
  • Ir-X coating based on surface alloying modification and preparation method thereof
  • Ir-X coating based on surface alloying modification and preparation method thereof

Examples

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Embodiment 1

[0041] A kind of Ir-X coating (specifically Ir-Cr coating) based on the surface alloying modification of the present invention, this Ir-X coating is mainly by successively depositing one layer of transition layer rhenium coating and A layer of iridium coating, and then the method of powder embedding and solidification is used to alloy and modify the surface of the iridium coating to obtain an Ir-X coating.

[0042] A method for preparing the Ir-X coating based on surface alloying modification of the above-mentioned present embodiment, comprising the following steps:

[0043] (1) The graphite samples deposited with 40 μm Re and 40 μm Ir were ultrasonically cleaned with ethanol for 10 minutes, then ultrasonically cleaned with deionized water for 5 minutes, and then dried at 100 °C for 10 minutes.

[0044] (2) Preparation of permeating agent: by mass percentage, the formula of chromizing agent is 25% Cr powder, 65% Cr 2 o 3 Powder and 10% NH 4 Cl, mix the raw materials in a ta...

Embodiment 2

[0048] A kind of preparation method based on the Ir-X coating of surface alloying modification of the present invention, comprises the following steps:

[0049] (1) The graphite samples deposited with about 40 μm Re and 40 μm Ir were ultrasonically cleaned with ethanol for 10 minutes, then ultrasonically cleaned with deionized water for 5 minutes, and then dried at 100 °C for 10 minutes.

[0050] (2) Preparation of infiltration agent: by mass percentage, the formulation of the infiltration agent is 40% Ti powder, 58% TiO 2 Powder and 2% NH 4 Cl, the raw materials were mixed in a pot mill for 3 hours and then taken out to obtain a titanizing agent.

[0051] (3) Embedding the dried sample in step (1) into the titanizing agent obtained in step (2) for powder embedding titanizing treatment. Embed the sample in a graphite crucible filled with titanium infiltrating agent, cover the lid, place the crucible in a tube furnace, close the outlet valve, operate the mechanical pump valve...

Embodiment 3

[0054] A kind of preparation method based on the Ir-X coating of surface alloying modification of the present invention, comprises the following steps:

[0055] (1) The graphite samples deposited with about 40 μm Re and 40 μm Ir were ultrasonically cleaned with ethanol for 10 minutes, then ultrasonically cleaned with deionized water for 5 minutes, and then dried at 100 °C for 10 minutes.

[0056] (2) Preparation of infiltrating agent: by mass percentage, the formulation of zirconium infiltrating agent is 30% Zr powder, 68% ZrO 2 powder (considering that zirconia is easy to sinter, which has a certain influence on the removal of the infiltrated parts, in order to make the infiltrated parts easier to remove, ZrO 2 Powder can also contain 8% Y 2 o 3 , but not containing also) and 2% NH 4 Cl, the raw materials were mixed in a tank mill for 3 hours and then taken out to obtain a zirconium agent.

[0057] (3) Embedding the dried sample in step (1) into the zirconium infiltrating...

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Abstract

The invention discloses an Ir-X coating based on surface alloying modification and a preparation method thereof. The preparation method of the Ir-X coating is characterized in that a transition layer,namely a rhenium coating and an iridium coating are deposited on a carbon composite material or a graphite substrate in sequence, and then metal X powder, metallic oxide XO powder corresponding to the metal X and a chloride activating agent are mixed to obtain a permeating agent, and a powder pack cementation method is adopted for enabling the iridium coating to be subjected to surface alloying modification, so as to obtain the Ir-X coating. The Ir-X coating based on surface alloying modification has a low surface catalytic effect and surface temperature in an aerodynamic environment, and isgreatly improved in service performance when compared with the conventional silicide coating system.

Description

technical field [0001] The invention belongs to the technical field of high-temperature materials, and relates to an ultra-high temperature oxidation-resistant coating system and its preparation, in particular to an Ir-X coating based on surface alloying modification and a preparation method thereof. Background technique [0002] Ultra-high temperature heat-resistant materials are widely used in the aerospace field, especially the surface of hypersonic aircraft and engine combustion chambers. Since most lightweight and high-strength matrix materials are easily oxidized at high temperatures (such as carbon / carbon composites), they need to be covered with an anti-oxidation coating on the outside. At present, the mainstream anti-oxidation coating is silicon-containing ceramics (such as SiC / ZrB 2 ), forming SiO at high temperature 2 The mucous layer blocks the entry of oxygen. However, SiO 2 It volatilizes violently above 1500°C and will actively oxidize to form gaseous SiO ...

Claims

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Application Information

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IPC IPC(8): C23C10/36C23C10/02
CPCC23C10/36C23C10/02
Inventor 朱利安叶益聪白书欣张虹万红张楷力
Owner NAT UNIV OF DEFENSE TECH
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