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Method for preparing porous nickel-based ODS ( Oxide Dispersion Strengthened) alloy

A porous nickel and alloy technology, applied in the field of porous high-temperature alloy preparation, can solve the problems of poor sinterability, uneven particle size, serious work hardening, etc., and achieve the effect of low cost and simple process

Active Publication Date: 2013-05-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods of porous metal materials mainly include molten metal foaming method, powder foaming method, spray foaming method, loose powder sintering method and hollow ball sintering method, etc., and the pore size and distribution are uneven, and the pore structure is not easy to control. question
The nickel-based ODS alloy powder prepared by the traditional mechanical alloying process has serious work hardening, irregular particle shape, and uneven particle size, and the nickel-based ODS alloy has a high melting point and poor sinterability, and it is difficult to prepare a porous nickel-based ODS alloy with uniform pore size.

Method used

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  • Method for preparing porous nickel-based ODS ( Oxide Dispersion Strengthened) alloy
  • Method for preparing porous nickel-based ODS ( Oxide Dispersion Strengthened) alloy
  • Method for preparing porous nickel-based ODS ( Oxide Dispersion Strengthened) alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: 2wt%Y 2 O 3 Preparation of Ni-Cr-Based ODS Alloy with Content Porous

[0017] According to the composition of Ni-based ODS alloy Ni-2wt%Y 2 o 3 Weigh Ni (NO 3 ) 2 ·6H 2 O and Y (NO 3 ) 3 ·6H 2 O, add urea and NO 3 - The molar ratio of glucose to NO is 0.4 3 - The molar ratio of the raw material is 0.65. Dissolve the raw material powder in an appropriate amount of deionized water and stir until it is completely dissolved, then heat it on the electric furnace. During the heating process, do not stop stirring until a large amount of thick smoke comes out, and stop heating when the combustion is about to start. Let the combustion reaction continue spontaneously for 3-5 minutes to obtain nano-NiO+Y 2 o 3 Mix powder. Nano NiO+Y 2 o 3 The mixed powder was reduced in a hydrogen atmosphere at 500° C. for 2 hours to obtain nano-nickel-based ODS powder with an average particle size of 20 nm. Next, the obtained nano-nickel-based ODS powder was ...

Embodiment 2

[0018] Example 2: 4wt%Y 2 O 3 Preparation of Ni-Al-Based ODS Alloy with Content Porous

[0019] According to the composition of Ni-based ODS alloy Ni-4wt%Y 2 o 3 Weigh Ni (NO 3 ) 2 ·6H 2 O and Y (NO 3 ) 3 ·6H 2 O, add urea and NO 3 - The molar ratio of glucose to NO is 0.5 3 - The molar ratio of the raw material is 0.4. Dissolve the raw material powder in an appropriate amount of deionized water and stir until it is completely dissolved, then heat it on the electric furnace. During the heating process, do not stop stirring until a large amount of thick smoke comes out, and stop heating when the combustion is about to start. Let the combustion reaction continue spontaneously for 3-5 minutes to obtain nano-NiO+Y 2 o 3 Mix powder. Nano NiO+Y 2 o 3 The mixed powder was reduced in a hydrogen atmosphere at 700° C. for 2 hours to obtain nano-nickel-based ODS powder with an average particle size of 13 nm. Then the obtained nano-nickel-based ODS powder and bi...

Embodiment 3

[0020] Example 3: 8wt%Y 2 O 3 Preparation of Ni-Al-Based ODS Alloy with Content Porous

[0021] According to the composition of Ni-based ODS alloy Ni-8wt%Y 2 o 3 Weigh Ni (NO 3 ) 2 ·6H 2 O and Y (NO 3 ) 3 ·6H 2 O, add urea and NO 3 - The molar ratio of glucose to NO is 0.6 3 - The molar ratio of the raw material is 0.3. Dissolve the raw material powder in an appropriate amount of deionized water and stir until it is completely dissolved, then place it on the electric furnace for heating. During the heating process, do not stop stirring until a large amount of thick smoke comes out, and stop heating when the combustion is about to start. Let the combustion reaction continue spontaneously for 3-5 minutes to obtain nano-NiO+Y 2 o 3 Mix powder. Nano NiO+Y 2 o 3 The mixed powder was reduced in a hydrogen atmosphere at 500° C. for 2 hours to obtain nano-nickel-based ODS powder with an average particle size of 30 nm. Next, the obtained nano-nickel-based ODS p...

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Abstract

The invention relates to a method for preparing a porous nickel-based ODS (Oxide Dispersion Strengthened) alloy, and belongs to the technical field of porous high temperature alloy preparation. The method comprises the following steps of: preparing nano mixed oxide powder by a low temperature combustion synthesis method; then, selectively reducing the oxide powder in hydrogen to obtain ODS alloy powder; then, obtaining a porous blank by pressing, injection moulding and degreasing the powder; and then sintering to obtain the final porous nickel-based ODS alloy or directly performing SPS (Spark Plasma Sintering) to obtain the final porous nickel-based ODS alloy. The method provided by the invention solves the problem that porous nickel-based ODS alloy which is complex in shape is hard to form and the pore structure is hard to control. The method has the advantages of strong designability of porosity and aperture, low cost, high utilization ratio of raw material powder and high strength at a high temperature, and is suitable for high temperature resisting, corrosion resisting and oxidization resisting conditions.

Description

[0001] technical field [0002] The invention belongs to the technical field of porous high-temperature alloy preparation, and in particular provides a method for preparing porous nickel-based oxide dispersion strengthening (Oxide Dispersion Strengthening, ODS) alloy by low-temperature combustion synthesis + selective reduction + discharge plasma sintering. Background technique [0003] Porous nickel-based ODS alloy is a functional structural material with dual properties of function and structure. It has certain strength, good oxidation resistance and corrosion resistance, and has low density, high porosity and large specific surface area. The porous nickel-based ODS alloy obtained by introducing a nano-oxide reinforcement phase into the nickel matrix can effectively improve the high-temperature mechanical properties of the porous material framework, making it of great importance in the fields of catalyst supports, filters, and heat exchangers used under high-temperature con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C19/03
Inventor 刘烨章林曲选辉秦明礼何新波黄敏张德志贾宝瑞
Owner UNIV OF SCI & TECH BEIJING
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