A method of combining powder metallurgy and forging to prepare ti2alnb matrix composite materials with imitation shell laminated structure

A composite material and powder metallurgy technology, which is applied in the field of preparing Ti2AlNb-based composite materials, can solve the problems of weak bonding strength between the reinforcement and the matrix, high content of impurity elements, and poor uniformity of the structure, so as to reduce the content of impurities and increase the specific surface area. , The effect of high interface bonding strength

Active Publication Date: 2021-12-03
HARBIN INST OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0004] The invention aims to solve the problems of low preparation efficiency, poor structure uniformity, high content of impurity elements in the prepared material, and weak bonding strength between the reinforcement and the matrix interface of the current imitation shell structure Ti2AlNb-based composite material, and proposes a powder metallurgy and forging Combined method for preparing shell-like structure Ti2AlNb-based composites

Method used

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  • A method of combining powder metallurgy and forging to prepare ti2alnb matrix composite materials with imitation shell laminated structure
  • A method of combining powder metallurgy and forging to prepare ti2alnb matrix composite materials with imitation shell laminated structure
  • A method of combining powder metallurgy and forging to prepare ti2alnb matrix composite materials with imitation shell laminated structure

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specific Embodiment approach 1

[0024] Specific Embodiment 1: In this embodiment, the method of combining powder metallurgy and forging to prepare a shell-like structure Ti2AlNb-based composite material is carried out according to the following steps:

[0025] 1. Weighing of raw materials

[0026] Weigh 0.4%~10% LaB by mass fraction 6 Powder, 0.2%~20% TiB 2 The spherical Ti2AlNb alloy powder of powder and surplus is as raw material;

[0027] 2. Preparation of boride-coated Ti2AlNb alloy powder

[0028] Mixing the raw materials weighed in step 1 and performing ball milling to obtain Ti2AlNb alloy powder coated with boride;

[0029] 3. Sintering of composite materials

[0030] Sintering the Ti2AlNb alloy powder coated and inlaid with boride in step 2 to obtain a sintered composite material;

[0031] 4. One-way upsetting of the sintered composite material, and then remove the sheath, that is to say, it is completed.

[0032] This embodiment has the following beneficial effects:

[0033] 1. This embodimen...

specific Embodiment approach 2

[0039] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the atomic percentage of Al in the spherical Ti2AlNb alloy powder described in step one is 15% to 27%, the atomic fraction of Nb is 10% to 30%, Mo, The sum of the atomic percentages of Ta, Si, W and Fe is 0% to 5%, and Ti is the balance.

specific Embodiment approach 3

[0040] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the particle size distribution range of the spherical Ti2AlNb alloy powder in step 1 is 0.5D to 2D, and D is the average particle size of the spherical Ti2AlNb alloy powder, and D =5~200μm; the LaB 6 The average particle size of 0.1 ~ 10μm; the TiB 2 The average particle size is 0.1-10 μm.

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Abstract

The invention relates to a method for preparing a Ti2AlNb-based composite material with an imitation shell laminated structure by combining powder metallurgy and forging, and relates to a method for preparing a Ti2AlNb-based composite material. The purpose is to solve the problems of low preparation efficiency of Ti2AlNb-based composite materials with imitation shell structure, difficulty in controlling the uniformity of the structure, high content of impurity elements in the prepared materials, and weak bonding strength between the reinforcement and the matrix interface. Method: weigh LaB 6 Powder, TiB 2 Powder and spherical Ti2AlNb alloy powder; ball milling to obtain Ti2AlNb alloy powder coated with boride, sintering of the composite material, and then unidirectional upsetting to remove the sheath. The method of the invention has high preparation efficiency, low impurity content in the prepared composite material, and high interface bonding strength between the reinforcing body and the base body. The invention is suitable for preparing the Ti2AlNb-based composite material with imitation shell laminated structure.

Description

technical field [0001] The invention relates to a method for preparing Ti2AlNb-based composite material. Background technique [0002] Compared with its matrix, discontinuously reinforced metal matrix composites have the advantages of higher specific strength, specific stiffness and higher heat resistance limit. Drawing on the microscopic "brick" laminated structure of shells with high strength and high toughness in nature, in recent years, scholars have prepared metal matrix composites with shell-like structures by adjusting the distribution of reinforcements. Studies have shown that the composite material with this structure has better strength and toughness matching, is more conducive to the plasticity of the matrix, and is expected to break through the bottleneck of existing metal matrix composites that cannot have both strength and plasticity. Discontinuously reinforced Ti2AlNb-based composites can increase the high-temperature service temperature limit of Ti2AlNb allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10
CPCC22C1/05
Inventor 韩秀丽张宁波王舒邈孙东立武高辉杨文澍张强修子扬姜龙涛陈国钦乔菁康鹏超芶华松
Owner HARBIN INST OF TECH
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