A method for controlling the mechanical properties of nial-based composites through powder particle size refinement

A technology of fine control and composite materials, applied in transportation and packaging, metal processing equipment, etc., which 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: 2022-07-29
HARBIN INST OF TECH
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  • 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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  • A method for controlling the mechanical properties of nial-based composites through powder particle size refinement
  • A method for controlling the mechanical properties of nial-based composites through powder particle size refinement
  • A method for controlling the mechanical properties of nial-based composites through powder particle size refinement

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specific Embodiment approach 1

[0041] Embodiment 1: A method for controlling the mechanical properties of NiAl-based composite materials through powder particle size refinement in this embodiment is completed by the following steps:

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

[0043] The average particle sizes of the 5 groups of original powders in step 1 are 10 μm, 20 μm, 30 μm, 40 μm and 50 μm respectively;

[0044] 2. Put 5 groups of original powders with different average particle diameters into 5 mixing buckets, respectively, and fill the 5 mixing buckets with O 2 , and then put the 5 mixing buckets on the drum ball mill to mix the powder, and obtain 5 groups of surface fully adhered O 2 alloy powder;

[0045] 3. Transfer the 5 sets of gold powders into 5 molds respectively, apply pressure and maintain the pressure respectively, and then put the 5 molds into the spark plasma sintering furnace respectively;

[0046]...

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 refining twice at a temperature of 1500 °C, and the time of each vacuum refining 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 as-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: The difference between this embodiment and Embodiment 1 or 2 is 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 in the first or second embodiment.

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Abstract

A method for controlling the mechanical properties of NiAl-based composite materials through fine particle size of powder relates to a method for controlling the mechanical properties of NiAl-based composite materials. The purpose of the present invention is to solve the problems that the existing intermetallic compound NiAl has the difficulty of finely controlling the grain size, the relationship between room temperature toughness and high temperature strength is difficult to coordinate, and the raw material size cannot be quickly selected by the mechanical properties of the pre-obtained NiAl matrix composite material. . Methods: 1. Screening; 2. Mixing powder; 3. Applying pressure and maintaining pressure; 4. Sintering; 5. Cooling and releasing pressure; 6. Obtaining relational formula A; 7. Obtaining relational formula B; 8. Obtaining relational formula C 9. Obtain relation D and relation E. The present invention can control the mechanical properties of the NiAl matrix composite material through the refinement of the powder particle size; the present invention can quickly select the raw material particle size through the pre-obtained mechanical properties of the NiAl matrix composite material, with an error rate of 0% to 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℃), high thermal conductivity (76W / m·K) and excellent oxidation resistance. , is regarded as a promising high-temperature structural material. However, the low room temperature plasticity and high temperature strength of NiAl intermetallics hinder its practical application. To this end, researchers at home and abroad have adopted processes such as alloying, preparation of multiphase alloys, preparation of composite materials, directional solidification, mechanical alloying, hot pressing and hot isostatic pressing, combustion synthesis and microcrystalline coating, which have greatly improved NiAl Mechanical properties of alloys. Among them, the preparation ...

Claims

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Application Information

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Patent Type & Authority Patents(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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