Powder metallurgy preparation method for Ni-Cr-Al-Fe high-temperature alloy

A technology of powder metallurgy and superalloy, which is applied in the field of powder metallurgy preparation, can solve the problems affecting the material strength, plasticity and comprehensive mechanical properties, the influence of heating rate and sintering temperature structure and composition, and the difficulty in obtaining high density. Good oxidation performance and anti-corrosion performance, simple method, anti-oxidation effect

Inactive Publication Date: 2018-11-06
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

The disadvantage of this method is that the cost is high and it is difficult to obtain high density, which significantly affects the strength, plasticity and comprehensive mechanical propert

Method used

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  • Powder metallurgy preparation method for Ni-Cr-Al-Fe high-temperature alloy

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Example Embodiment

[0016] Example 1

[0017] A powder metallurgy preparation method of Ni-Cr-Al-Fe series high-temperature alloy, the specific steps are as follows:

[0018] (1) First, mix the nano-scale nickel powder, chromium powder, aluminum powder and iron powder in a mass ratio of 420:90:15:25 to obtain a Ni-Cr-Al-Fe mixed powder.

[0019] (2) Under the protection of argon, the Ni-Cr-Al-Fe mixed powder obtained in step (1) is heated in an induction furnace to 1450℃ for 1 hour to obtain a qualified alloy liquid, and then the alloy liquid is injected into the atomizing nozzle In the upper tundish, the alloy liquid flows out from the leaking hole at the bottom of the tundish at a flow rate of 1.8kg / min. When passing through the HK-03 ring-shaped orifice nozzle, it meets the high-speed argon gas flow with a pressure of 6MPa and is atomized into fine droplets. The atomized droplets are rapidly solidified into Ni-Cr-Al-Fe alloy powder in the closed atomization cylinder, and pass through a 100-mesh stan...

Example Embodiment

[0021] Example 2

[0022] A powder metallurgy preparation method of Ni-Cr-Al-Fe series high-temperature alloy, the specific steps are as follows:

[0023] (1) First, mix the nano-scale nickel powder, chromium powder, aluminum powder and iron powder in a mass ratio of 400:75:13:17 to obtain a Ni-Cr-Al-Fe mixed powder.

[0024] (2) Under the protection of argon, heat the Ni-Cr-Al-Fe mixed powder obtained in step (1) in an induction furnace to 1450℃ for 1 hour to obtain a qualified alloy liquid, and then inject the alloy liquid into the atomizing nozzle In the upper tundish, the alloy liquid flows out from the leaking hole at the bottom of the tundish at a flow rate of 1.8kg / min. When passing through the HK-03 ring-shaped orifice nozzle, it meets the high-speed argon gas flow with a pressure of 6MPa and is atomized into fine droplets. The atomized droplets are rapidly solidified into Ni-Cr-Al-Fe alloy powder in the closed atomization cylinder, and pass through a 100-mesh standard sieve...

Example Embodiment

[0026] Example 3

[0027] A powder metallurgy preparation method of Ni-Cr-Al-Fe series high-temperature alloy, the specific steps are as follows:

[0028] (1) First, mix the nano-scale nickel powder, chromium powder, aluminum powder and iron powder in a mass ratio of 455:105:17:34 to obtain a Ni-Cr-Al-Fe mixed powder.

[0029] (2) Under the protection of argon, heat the Ni-Cr-Al-Fe mixed powder obtained in step (1) in an induction furnace to 1450℃ for 1 hour to obtain a qualified alloy liquid, and then inject the alloy liquid into the atomizing nozzle In the upper tundish, the alloy liquid flows out from the leaking hole at the bottom of the tundish at a flow rate of 1.8kg / min. When passing through the HK-03 ring-shaped orifice nozzle, it meets the high-speed argon gas flow with a pressure of 6MPa and is atomized into fine droplets. The atomized droplets are rapidly solidified into Ni-Cr-Al-Fe alloy powder in the closed atomization cylinder, and pass through a 100-mesh standard siev...

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Abstract

The invention discloses a powder metallurgy preparation method for a Ni-Cr-Al-Fe high-temperature alloy, and belongs to the technical field of high-temperature alloys. According to the powder metallurgy preparation method, Ni-Cr-Al-Fe alloyed powder is obtained through a gas atomization method, a nano-powder body is extruded into blocks, sintering is conducted in the hydrogen environment through avacuum double-tube heating furnace, thus Ni-Cr-Al-Fe alloying is achieved again, and the Ni-Cr-Al-Fe blocky alloy is obtained. During sintering, oxidation of powder is effectively reduced through using of reductive gas, generating of other oxide impurities is reduced, the grains of the Ni-Cr-Al-Fe high-temperature alloy prepared through a nanotechnology are refined, meanwhile, chemical propertiessuch as corrosion resistance, specific strength and high-temperature oxygen resistance of the Ni-Cr-Al-Fe high-temperature alloy are greatly improved, and the application requirements of gas turbinescan be met.

Description

Technical field [0001] The invention relates to a powder metallurgy preparation method of Ni-Cr-Al-Fe series high-temperature alloys, and belongs to the technical field of powder metallurgy preparation. Background technique [0002] High-temperature alloy is an irreplaceable key material for the hot end parts of military and civilian gas turbine engines. Ni-Cr-Al-Fe alloy has high strength, oxidation resistance, and excellent high temperature corrosion resistance. It is very Development of promising high-temperature structural materials. As the power of industrial gas turbines continues to increase, the demand for high-performance superalloy materials has also increased. [0003] Among the preparation methods of Ni-Cr-Al-Fe alloy, the melting and casting method and powder metallurgy method are more common preparation methods. The traditional melting and casting method is to melt the raw materials by vacuum induction melting or vacuum arc melting, and then refine the crystal grain...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/04B22F9/08B22F3/10
Inventor 陈良郑春
Owner KUNMING UNIV OF SCI & TECH
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