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Preparation method for Al2O3 diffusion barrier between TiAl alloy and MCrAlY coating

A technology of alloy and coating, which is applied in the field of preparing Al2O3 diffusion barrier, can solve the problems of reducing the fatigue life of the substrate, deteriorating the long-term high-temperature oxidation resistance of the coating, and the mechanical properties of the substrate, so as to achieve the effect of slowing down the interdiffusion

Inactive Publication Date: 2014-02-19
TONGLING UNIV
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Problems solved by technology

However, when the MCrAlY coating is used on the surface of TiAl alloy, during the long-term high-temperature oxidation process, the inward diffusion process of Ni and Co in the MCrAlY coating will lead to the transformation of the substrate side from γ-TiAl to hard and brittle AlM 2 T (M is Ni and / or Co) ternary intermetallic compound, the interdiffusion between the coating and the substrate will deteriorate the long-term high-temperature oxidation resistance of the coating and the mechanical properties of the substrate, especially such a hard and brittle diffusion layer Will significantly reduce the fatigue life of the matrix

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  • Preparation method for Al2O3 diffusion barrier between TiAl alloy and MCrAlY coating

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Embodiment 1

[0022] Such as figure 1 As shown, this embodiment is to prepare Al between γ-TiAl alloy and plasma sprayed MCrAlY coating 2 o 3 Diffusion barrier, the specific steps are as follows:

[0023] (1) Purify and activate the TiAl alloy substrate (γ-TiAl alloy with the brand name TAC-2 of the High Temperature Materials Research Institute of the General Iron and Steel Research Institute);

[0024] (2) In a 10kW multifunctional double-layer glow ion infiltration metal furnace, the surface of the pretreated TiAl alloy is infiltrated with Al. The pure Al plate is used as the source electrode, and the TiAl alloy is used as the cathode. The electrode spacing is 18mm, and the vacuum is pumped to 2.0× 10 -2 Pa, filled with protective gas 99.9% high-purity argon up to 28Pa, source voltage 940V, substrate (cathode) voltage 340V, substrate temperature 930°C, Al infiltration time is 3h, holding time is 4h, effective infiltration layer thickness is about 30μm ;

[0025] (3) Perform micro-arc...

Embodiment 2

[0031] This embodiment prepares Al between γ-TiAl alloy and arc ion plating MCrAlY coating 2 o 3 Diffusion barrier, the specific steps are as follows:

[0032] (1) Purify and activate the TiAl alloy substrate (γ-TiAl alloy with the brand name TAC-2 of the High Temperature Materials Research Institute of the General Iron and Steel Research Institute);

[0033](2) In a 10kW multifunctional double-layer glow ion infiltration metal furnace, the surface of the pretreated TiAl alloy is infiltrated with Al. The pure Al plate is used as the source electrode, and the TiAl alloy is used as the cathode. The electrode spacing is 20mm, and the vacuum is pumped to 2.2× 10 -2 Pa, filled with protective gas 99.9% high-purity argon up to 30Pa, source voltage 950V, substrate (cathode) voltage 350V, substrate temperature 940°C, Al infiltration time is 4h, holding time is 4h, effective infiltration layer thickness is about 40μm ;

[0034] (3) Perform micro-arc oxidation treatment on the TiAl ...

Embodiment 3

[0037] This embodiment prepares Al between γ-TiAl alloy and vacuum plasma sprayed MCrAlY coating 2 o 3 Diffusion barrier, the specific steps are as follows:

[0038] (1) Purify and activate the TiAl alloy substrate (γ-TiAl alloy with the brand name TAC-2 of the High Temperature Materials Research Institute of the General Iron and Steel Research Institute);

[0039] (2) In a 10kW multifunctional double-layer glow ion infiltration metal furnace, the surface of the pretreated TiAl alloy is infiltrated with Al. The pure Al plate is used as the source electrode, and the TiAl alloy is used as the cathode. The electrode spacing is 22mm, and the vacuum is pumped to 2.4× 10 -2 Pa, filled with protective gas 99.9% high-purity argon up to 32Pa, source voltage 960V, substrate (cathode) voltage 360V, substrate temperature 950℃, Al infiltration time is 5h, holding time is 4h, effective infiltration layer thickness is about 50μm ;

[0040] (3) Perform micro-arc oxidation treatment on the...

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Abstract

The invention discloses a preparation method for a Al2O3 diffusion barrier between a TiAl alloy and a MCrAlY coating. The preparation method comprises the following steps: preteating a TiAl alloy matrix; subjecting the surface of the pretreated TiAl alloy matrix to double-layer glow ion aluminizing; carrying out micro arc oxidation on an aluminized layer so as to produce the Al2O3 diffusion barrier; and preparing the MCrAlY coating on the surface of the diffusion barrier. The Al2O3 diffusion barrier prepared in the invention is a ceramic membrane growing in situ in the process of micro arc oxidation, firmly bonds with the TiAl alloy matrix and is compact and uniform, so mutual diffusion between the TiAl alloy matrix and the MCrAlY coating in the process of high temperature oxidation is effectively mitigated, and long-term high temperature oxidation resistance and the service life of the TiAl alloy are improved.

Description

technical field [0001] The invention relates to a method for preparing a thermal diffusion barrier on a metal surface, in particular to a method for preparing an Al alloy between a TiAl alloy and a MCrAlY coating. 2 o 3 Diffusion barrier method. Background technique [0002] TiAl-based intermetallic compound alloys (TiAl alloys for short), including γ-TiAl alloys, TiAlNb alloys, etc., have the advantages of low density, high specific strength and specific stiffness, good high-temperature creep and high-temperature fatigue properties, and are considered to be extremely applicable. It is one of the promising new lightweight high-temperature structural materials, especially for future aerospace, engines and gas turbines. However, when the TiAl alloy is used at a temperature higher than 800 °C, its oxidation resistance decreases rapidly, so further improving the high temperature oxidation resistance of the TiAl alloy has become an urgent problem to be solved. [0003] The hig...

Claims

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Application Information

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IPC IPC(8): C23C14/32C23C14/16C25D11/04C23C28/00
Inventor 王东生
Owner TONGLING UNIV
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