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Method for near-net shaping of porous Ni-based ODS (oxide dispersion strengthening) alloy

A technology of near net forming and porous nickel, which is applied in the direction of process efficiency improvement, additive manufacturing, additive processing, etc., can solve the problems of porous nickel-based ODS alloy forming and pore structure control difficulties, and achieve strong designability, The effect of high utilization rate and high temperature strength

Active Publication Date: 2013-04-24
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for selective laser sintering of near-net-shaped porous nickel-based ODS alloys, aiming to solve the problem of difficult formation and pore structure control of porous nickel-based ODS alloys with complex shapes

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  • Method for near-net shaping of porous Ni-based ODS (oxide dispersion strengthening) alloy

Examples

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Embodiment 1

[0018] Embodiment 1: the preparation of porous nickel-chromium-based ODS alloy

[0019] According to the composition of nickel-chromium-based ODS alloy [15wt.%Cr-0.3wt.%Y 2 o 3 -0.5wt.%Hf-balance Ni] Weigh nickel powder, chromium powder, Y 2 o 3 Granules and hafnium powder, and pre-mix the mixed powder evenly. The premixed powder is uniformly dispersed in the nickel matrix by high-energy ball milling in a high-purity Ar atmosphere, where the ball / material ratio is 10 / 1, the ball mill speed is 350 rpm, and the ball milling time is 24 hours. The obtained nickel matrix The particle size of ODS alloy powder is 35~74μm. Secondly, the nickel-based ODS alloy powder and the thermoplastic polymer were pre-mixed uniformly and then put into a kneader for stirring. The heating temperature was 140°C and the stirring time was 40 minutes to obtain the nickel-based ODS alloy powder uniformly coated with the polymer, and the Crushing and dispersing the aggregated polymer-coated nickel-b...

Embodiment 2

[0020] Embodiment 2: Preparation of porous nickel-aluminum-based ODS alloy

[0021] According to the composition of nickel-aluminum-based ODS alloy [20wt.%Al-1wt.%Y 2 o 3 -1wt.%Hf-balance Ni] Weigh nickel powder, aluminum powder, Y 2 o 3Granules and hafnium powder, and pre-mix the mixed powder evenly. The premixed powder is uniformly dispersed in the nickel matrix by high-energy ball milling in a high-purity Ar atmosphere, wherein the ball / material ratio is 15 / 1, the ball mill speed is 380 rpm, and the ball milling time is 36 hours. The obtained nickel matrix The particle size of ODS alloy powder is 21~62μm. Secondly, the nickel-based ODS alloy powder and the thermoplastic polymer were pre-mixed uniformly and then put into a kneader for stirring. The heating temperature was 150°C and the stirring time was 50 minutes to obtain the nickel-based ODS alloy powder uniformly coated with the polymer, and the Crushing and dispersing the aggregated polymer-coated nickel-based OD...

Embodiment 3

[0022] Example 3: Preparation of single-aperture porous nickel-based ODS alloy (MA754)

[0023] According to the composition of nickel-based ODS alloy MA754 [20wt.%Cr-0.3wt.%Al-0.5wt.%Ti-1%wt.%Fe

[0024] -0.05wt.%C-(0.3~3wt.%)-Y 2 o 3 - Balance Ni] Weigh nickel powder, chromium powder, aluminum powder, titanium powder, iron powder, carbon powder and Y 2 o 3 Granules, and pre-mix the mixed powder evenly. The premixed powder is uniformly dispersed in the nickel matrix by high-energy ball milling in a high-purity Ar atmosphere, wherein the ball / material ratio is 20 / 1, the ball mill speed is 400 rpm, and the ball milling time is 48 hours. The obtained nickel matrix The particle size of ODS alloy powder is 25~80μm. Nickel-based ODS alloy powders with different particle sizes after ball milling for different times were sieved to obtain nickel-based ODS alloy powders with a diameter of 25-28 μm. Ni-based ODS alloy powder with narrow particle size distribution at a powder fee...

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Abstract

A method for the near-net shaping of a porous Ni-based ODS alloy belongs to the technical field of porous alloy high-temperature preparation. The method comprises the following steps: adopting a mechanical alloyage technology to obtain oxide dispersion reinforced alloy powder, and carrying out grading and plasma spheroidization of Ni-based ODS alloy powder to obtain spherical Ni-based ODS alloy powder having uniform particle sizes; carrying out heating stirring of the Ni-based ODS alloy powder with a thermoplastic polymer in a kneader to obtain polymer coated Ni-based ODS alloy powder; designing a three-dimensional solid model of an Ni-based ODS alloy part through adopting CAD software, carrying out layering slicing treatment of the three-dimensional model to discretize into a series of two-dimensional layers used for the rapid shaping process control; and scanning the Ni-based ODS alloy powder layer by layer according to slice information to obtain a porous Ni-based ODS alloy body. The method is suitable for preparing complex-shape porous metals used under high temperature, corrosion and oxidation resistance conditions, and the porous Ni-based ODS alloy has the characteristics of high high-temeprature strength, and strong porosity and pore size designability.

Description

[0001] technical field [0002] The invention belongs to the technical field of preparation of porous high-temperature alloys, and in particular provides a method for forming porous nickel-based (Oxide Dispersion Strengthening, ODS) ODS alloys with controllable pore diameter by using selective laser sintering technology as a raw material. . Background technique [0003] Porous nickel-based ODS alloy has the advantages of controllable pore size, high porosity, large specific surface area, excellent high-temperature mechanical properties, good oxidation resistance and corrosion resistance, and has broad applications in various catalyst supports, filters and heat exchangers. prospect. Nano-composite oxide disperse phase strengthening is an effective measure to endow porous Ni-based ODS alloys with excellent high-temperature mechanical properties. The key technology for the preparation of porous nickel-based ODS alloys is to control the pore structure. At present, the prepara...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C19/05
CPCC22C32/0026B33Y10/00Y02P10/25B22F12/13B22F10/36B22F10/366B22F10/16B22F10/34B33Y70/10
Inventor 章林曲选辉秦明礼刘烨何新波
Owner UNIV OF SCI & TECH BEIJING
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