A kind of tial-based laser cladding superalloy coating and preparation method thereof

A laser cladding and base alloy technology, which is applied in the coating process and coating of metal materials, can solve the problems of room temperature brittleness and high temperature oxidation resistance, hinder the application and promotion of TiAl base alloys, and achieve good high temperature oxidation resistance , Saving cladding efficiency and reducing the effect of crystallization rate

Active Publication Date: 2018-07-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

TiAl alloy has the advantages of high specific stiffness and high specific strength, but there are also some problems that hinder the industrial application and promotion of TiAl-based alloys, mainly room temperature brittleness and high temperature oxidation resistance.

Method used

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  • A kind of tial-based laser cladding superalloy coating and preparation method thereof
  • A kind of tial-based laser cladding superalloy coating and preparation method thereof
  • A kind of tial-based laser cladding superalloy coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, the surface modification materials of high-temperature parts are composed of Al, P, Ti, Nb, Zr, Y, and Ce. Specifically, the mass fraction of cladding powder is as follows: Al: 49%, P: 2%, Ti: 33%, Nb : 5%, Zr: 7%, Y: 2%, Ce: 2%.

[0025] The preparation method of the TiAl-based alloy laser cladding coating described in this implementation specifically includes the following steps:

[0026] (1) After mixing the cladding powder, perform ball milling (180 mesh) and dry to obtain a uniformly mixed cladding powder;

[0027] (2) Pretreatment of the TiAl alloy substrate: grinding the surface, decontamination, and drying for later use;

[0028] (3) The cladding powder obtained in step (1) is made into a strip-shaped preset layer (60mm×4mm×3mm in size), and the preset layer is placed on the surface of the TiAl alloy substrate. The surface of the TiAl alloy substrate and the preset layer are melted at the same time to form a coating. The process parameters of ...

Embodiment 2

[0031] In this example, the surface modification materials of high-temperature parts are composed of Al, P, Ti, Nb, Zr, Y, and Ce. Specifically, the mass fraction of cladding powder is as follows: Al: 46%, P: 2%, Ti: 37%, Nb : 5%, Zr: 7%, Y: 2%, Ce: 1%.

[0032] The preparation method of the TiAl-based alloy laser cladding coating described in this implementation specifically includes the following steps:

[0033] (1) After mixing the cladding powders, perform ball milling (160 mesh) and dry to obtain uniformly mixed cladding powders;

[0034] (2) Pretreatment of the TiAl alloy substrate: grinding the surface, decontamination, and drying for later use;

[0035] (3) The cladding powder obtained in step (1) is made into a strip-shaped preset layer (60mm×4mm×3mm in size), and the preset layer is placed on the surface of the TiAl alloy substrate. The surface of the TiAl alloy substrate and the preset layer are melted at the same time to form a coating. The process parameters of ...

Embodiment 3

[0041] In this example, the surface modification materials of high-temperature parts are composed of Al, P, Ti, Nb, Zr, Y, and Ce. Specifically, the mass fraction of cladding powder is as follows: Al: 52%, P: 2%, Ti: 34.2%, Nb : 5%, Zr: 4%, Y: 2%, Ce: 0.8%, the preparation method of the TiAl-based alloy laser cladding coating described in this embodiment is the same as that in Example 2, and the performance of the prepared material coating is the same as that in Example 2. 1 and 2 are similar.

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Abstract

The invention discloses a laser cladding coating of a TiAl-based alloy, and a preparation method thereof, and belongs to the technical field of metal surface coating modification. A cladding powder of the laser cladding coating disclosed by the invention comprises Al, P, Ti, Nb, Zr, Y and Ce, and specifically comprises the following components in mass fraction: 46%-52% of Al, 2% of P, 33%-37% of Ti, 5% of Nb, 4%-7% of Zr, 2%-3% of Y and 0.8-2% of Ce. The preparation method of the laser cladding coating comprises the flows of raw material proportioning, base material selection, pretreatment, laser cladding, aftertreatment and the like; the cladding coating is prepared through a reasonable element proportioning design and reasonable laser cladding process parameters; and the hardness and the high-temperature oxidation resistance of the coating are both obviously improved compared with a base material through a test on the macro-morphology and the performance of the cladding coating.

Description

technical field [0001] The invention relates to a TiAl-based alloy laser cladding coating and a preparation method thereof, belonging to the technical field of metal surface coating modification. Background technique [0002] In modern industry, in order to meet the requirements of high temperature service conditions such as aero engines and industrial gas turbines. The performance of high temperature protective coating against high temperature oxidation and corrosion resistance also requires that the protective layer has a stable structure and is well bonded to the substrate. TiAl alloy has the advantages of high specific stiffness and high specific strength, but there are also some problems that hinder the industrial application and promotion of TiAl-based alloys, mainly room temperature brittleness and high temperature oxidation resistance. For its high-temperature oxidation resistance and wear resistance, obtaining coating materials with good comprehensive properties is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C30/00C23C24/10B22F1/00
CPCB22F1/0003C22C21/003C22C30/00C23C24/103
Inventor 刘洪喜刘子峰石海郭新政王悦怡
Owner KUNMING UNIV OF SCI & TECH
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