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Al-based composite material as well as preparation method and application thereof

A composite material and equipment technology, applied in the field of Al-Bi-TiB2 composite material and preparation, can solve the problems affecting the mechanical properties of Al-Bi alloy, delamination phenomenon, Al-Bi alloy cannot realize the uniform distribution of Bi-rich phase, etc.

Active Publication Date: 2022-04-08
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, Al-Bi alloys can be prepared by traditional methods such as powder metallurgy or stir casting. However, the microstructure of Al-Bi alloys produced by stir casting has serious The phase agglomeration phenomenon, the Al matrix and the Bi-rich phase will appear obvious delamination phenomenon, the production process of the powder metallurgy method is complicated, the cost is high, the most critical thing is that the prepared Al-Bi alloy cannot fundamentally solve the problem of gravity segregation, the same It is prone to obvious delamination phenomenon between Al matrix and Bi-rich phase, and this uneven structure severely limits the practical application of Al-Bi alloys.
In summary, no matter the powder metallurgy method or the stirring casting method, the prepared Al-Bi alloy cannot realize the uniform distribution of the Bi-rich phase in the Al matrix, which affects the mechanical properties of the Al-Bi alloy.

Method used

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  • Al-based composite material as well as preparation method and application thereof
  • Al-based composite material as well as preparation method and application thereof
  • Al-based composite material as well as preparation method and application thereof

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preparation example Construction

[0030] The invention provides an Al-Bi-TiB 2 The preparation method of composite material, comprises the following steps:

[0031] TiB 2p / Al composite material and Bi simple substance are heated and melted to obtain Al-Bi-TiB 2 melt; the TiB 2p TiB in / Al composites 2 The mass percentage of particles is ≤6%, and the Al-Bi-TiB 2 The mass percentage of Bi phase in the melt is ≤20%;

[0032] The Al-Bi-TiB 2The melt is cast after ultrasonic treatment to obtain the Al-Bi-TiB 2 composite material.

[0033] In the present invention, the TiB 2p TiB in / Al composites 2 The mass percentage of the particles is ≤6%, preferably 3-6%, more preferably 4-5%.

[0034] In the present invention, the TiB 2p The preparation method of / Al composite material comprises the following steps:

[0035] Mix and melt aluminum melt, borofluoride and titanate fluoride to obtain Al-TiB 2 Melt; the molar ratio of borofluorate and titanium fluoride is TiB 2 The atomic ratio of Ti element and B el...

Embodiment 1

[0079] Heat and melt the aluminum element to obtain an aluminum melt with a temperature of 800°C, according to TiB 2 The atomic ratio of Ti element and B element in, and TiB 2p TiB in / Al composites 2 The mass percentage of particles is 3-5%, and KBF is added to the aluminum melt 4 and K 2 TiF 6 Finally, keep warm at 800°C for 30 minutes, pour out the upper layer of impurities, and pour the remaining melt into a metal mold to cool and form after stirring to obtain TiB 2 p / Al composite material;

[0080] TiB 2p / Al composite material is placed in a resistance furnace, and when the temperature is raised to 920-950°C at 15°C / min, the TiB 2p Al-Bi-TiB is obtained by adding Bi powder into the Al composite 2 For the initial melt, continue to increase the temperature at 20°C / min to 1020-1050°C, then mechanically stir and heat-preserve for 10 minutes to obtain Al-Bi-TiB 2 Melt, where Al-Bi-TiB 2 The mass percentage of Bi phase in the melt is 5%;

[0081] Al-Bi-TiB 2 Ultraso...

Embodiment 2

[0085] Heat and melt the aluminum element to obtain an aluminum melt with a temperature of 800°C, according to TiB 2 The atomic ratio of Ti element and B element in, and TiB 2p TiB in / Al composites 2 The mass percentage of particles is 3-5%, and KBF is added to the aluminum melt 4 and K 2 TiF 6 Finally, keep warm at 800°C for 30 minutes, pour out the upper layer of impurities, and pour the remaining melt into a metal mold to cool and form after stirring to obtain TiB 2 p / Al composite material;

[0086] TiB 2p / Al composite material is placed in a resistance furnace, and when the temperature is raised to 920-950°C at 15°C / min, the TiB 2p Al-Bi-TiB is obtained by adding Bi powder into the Al composite 2 For the initial melt, continue to increase the temperature at 20°C / min to 1020-1050°C, then mechanically stir and heat-preserve for 10 minutes to obtain Al-Bi-TiB 2 Melt, where Al-Bi-TiB 2 The mass percentage of Bi phase in the melt is 10%;

[0087] Al-Bi-TiB 2 Ultras...

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Abstract

The invention relates to the technical field of immiscible alloys, in particular to an Al-Bi-TiB2 composite material as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: heating and melting a TiB2p / Al composite material and a Bi elementary substance to obtain an Al-Bi-TiB2 melt; the mass percentage content of TiB2 particles in the TiB2p / Al composite material is less than or equal to 6%, and the mass percentage content of a Bi phase in the Al-Bi-TiB2 mixed melt is less than or equal to 20%; and carrying out ultrasonic treatment on the Al-Bi-TiB2 melt, and then, carrying out casting, so as to obtain the Al-Bi-TiB2 composite material. According to the preparation method provided by the invention, the yield strength and the tensile strength of the Al-Bi-TiB2 composite material are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of refractory alloys, in particular to an Al-Bi-TiB 2 Composite materials and their preparation methods and applications. Background technique [0002] A composite material is a multiphase solid material composed of two or more materials with different physical and chemical properties. Several materials with different properties learn from each other in terms of performance and produce synergistic effects. Therefore, the comprehensive performance of the prepared composite material is better than that of the original constituent materials, and can meet various requirements. Composite materials generally include two parts: a matrix and a reinforcement. Usually, the continuously distributed component is called the matrix, and the discontinuous component in the matrix is ​​called the reinforcement. The matrix of the composite material can be made of metal or alloy, polymer material, ceramic material, etc., and...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C21/00C22C32/00
Inventor 陈宗宁康慧君郭恩宇王同敏刘博骁刘磊张宇博接金川卢一平曹志强李廷举
Owner DALIAN UNIV OF TECH
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