Method for finely controlling mechanical property of NiAl-based composite material through particle size ofpowder

A technology of fine control and composite materials, applied in transportation and packaging, metal processing equipment, etc., can solve the problems of difficult fine control of grain size, difficult coordination of room temperature toughness and high temperature strength, etc.

Active Publication Date: 2022-02-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing intermetallic compound NiAl has difficulty in finely controlling the grain size, the relationship between room temperature toughness and high temperature strength is difficult to coordinate, and the problem that the raw material size cannot be quickly selected through the mechanical properties of the pre-obtained NiAl-based composite material , and provide a method for controlling the mechanical properties of NiAl-based composites through the refinement of powder particle size

Method used

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  • Method for finely controlling mechanical property of NiAl-based composite material through particle size ofpowder
  • Method for finely controlling mechanical property of NiAl-based composite material through particle size ofpowder
  • Method for finely controlling mechanical property of NiAl-based composite material through particle size ofpowder

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specific Embodiment approach 1

[0041] Specific Embodiment 1: In this embodiment, a method for finely controlling the mechanical properties of NiAl-based composite materials through powder particle size is completed in the following steps:

[0042] 1. Sieve the NiAl-based composite material alloy powder into 5 groups of raw powders with different average particle sizes;

[0043] The average particle diameters of the five groups of primary powders in step 1 are 10 μm, 20 μm, 30 μm, 40 μm and 50 μm, respectively;

[0044] 2. Put 5 groups of raw powders with different average particle sizes into 5 mixing buckets respectively, and fill the 5 mixing buckets with O 2 , and then put 5 powder mixing buckets on the roller ball mill to mix powder, and get 5 groups of surfaces fully adhered to O 2 alloy powder;

[0045] 3. Transfer 5 groups of alloy powders into 5 moulds, respectively apply pressure and maintain pressure, and then put 5 moulds into spark plasma sintering furnaces respectively;

[0046] 4. Conduct el...

specific Embodiment approach 2

[0067] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the preparation method of the NiAl-based composite material alloy powder described in step 1 is as follows:

[0068] 1. Weigh metal Ni particles, Al particles and Hf particles, mix them evenly, and then vacuum refine them twice at a temperature of 1500°C, each vacuum refining time is 5 minutes, to obtain a liquid alloy;

[0069] 2. Transfer the liquid alloy into a cylindrical mold for cooling to obtain a cylindrical cast alloy;

[0070] 3. The cylindrical cast alloy is prepared into NiAl-based composite material alloy powder by argon atomization method. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0071] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the purity of the metal Ni particles, Al particles and Hf particles described in step 1 is greater than 99.5%. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for finely controlling the mechanical property of a NiAl-based composite material through the particle size of powder, which relates to a method for controlling the mechanical property of the NiAl-based composite material and aims to solve the problems that the grain size of the existing intermetallic compound NiAl is difficult to finely control, the relationship between the room-temperature toughness and the high-temperature strength is difficult to coordinate, and the size of the raw material cannot be quickly selected according to the pre-obtained mechanical property of the NiAl-based composite material. The method comprises the following steps of 1, screening, 2, mixing the powder, 3, applying pressure and maintaining pressure, 4, sintering, 5, cooling and pressure relief, 6, obtaining a relational expression A, 7, obtaining a relational expression B, 8, obtaining a relational expression C, and 9, obtaining a relational expression D and a relational expression E. The mechanical property of the NiAl-based composite material can be finely controlled through the particle size of the powder; the particle size of the raw material can be quickly selected according to the mechanical property of the pre-obtained NiAl-based composite material, and the error rate is 0-2%.

Description

technical field [0001] The invention relates to a method for controlling the mechanical properties of NiAl-based composite materials. Background technique [0002] The long-range ordered intermetallic compound NiAl with B2 structure has the advantages of low density (2 / 3 of Ni-based superalloy), high melting point (1638°C), high thermal conductivity (76W / m K) and excellent oxidation resistance. , is regarded as a high-temperature structural material with great potential. However, the low room temperature ductility and high temperature strength of NiAl intermetallic compounds hinder its practical application. To this end, researchers at home and abroad have adopted processes such as alloying, preparation of multi-phase alloys, preparation of composite materials, directional solidification, mechanical alloying, hot pressing and hot isostatic pressing, combustion synthesis, and microcrystalline coating, which have greatly improved the NiAl alloy. The mechanical properties of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/14B22F1/065B22F3/105B22F9/04B22F9/08C22C19/03
CPCB22F9/04B22F3/105B22F9/082C22C19/03B22F2009/043B22F2003/1051B22F2009/0824B22F2009/0848
Inventor 刘德凯卢振蒋少松刘伟
Owner HARBIN INST OF TECH
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