A method for preparing titanium boride particle reinforced aluminum matrix composites by spark plasma sintering

A technology of spark plasma and particle reinforced aluminum, which is applied in the field of Al-based composite material preparation, can solve the problems of long sintering time, unstable phase and high sintering temperature, and achieve the effects of shortening the holding time, avoiding harmful reactions and reducing the sintering temperature.

Active Publication Date: 2018-03-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of TiB by Conventional Powder Metallurgy 2 Particle-reinforced Al-based composite materials require molding steps after powder mixing. The sintering temperature is high, the sintering time is long, and harmful reactions between particles and the matrix are prone to occur.
The in situ method for preparing TiB 2 It is difficult to fully grasp the internal chemical reaction process and reaction degree of particle-reinforced Al-based composites, TiB 2 The morphology and distribution of particles are difficult to control, and it is not easy to prepare TiB with high volume fraction by in-situ method 2 Particle Reinforced Al Matrix Composites
[0003] China's existing regulations on the preparation of TiB 2 Invention patents for particle reinforced Al-based composites have the following deficiencies: TiB 2 The morphology and distribution of the particles are difficult to control. Micron-sized reinforcing particles can only improve the performance of the composite material to a limited extent, and unstable phases may be generated during the preparation process, which will adversely affect the performance of the composite material. In addition, the process is longer and the cost is higher. high
Moreover, TiB has not been prepared by spark plasma sintering (SPS) so far. 2 / Al composite materials related reports

Method used

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  • A method for preparing titanium boride particle reinforced aluminum matrix composites by spark plasma sintering
  • A method for preparing titanium boride particle reinforced aluminum matrix composites by spark plasma sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] TiB with a particle size of 100nm 2 Particles, 15um Al powder as raw materials, according to TiB 2 The mass fraction is 10wt.% for batching. Wet ball milling was adopted, the ball milling medium was absolute ethanol, the mass ratio of ball to material was 8:1, the ball milling speed was 200r / min, and the ball milling time was 8h. After the ball-milled mixed powder is dried, put it into the SPS mold, increase the pressure to 40MPa, and keep the pressure for 20 minutes to compact the mixed powder, then raise the temperature to 520°C, and keep the sintering temperature and pressure for 10 minutes, and finally the composite material Cool to obtain a composite material with a diameter of 40 mm and a height of 15 mm. The prepared composite material has a density of 97.7%, a hardness of 67.5HV, and TiB 2 The particle distribution is uniform, and there is no large amount of TiB 2 The particle agglomeration phenomenon, no shedding phenomenon was found between the particle an...

Embodiment 2

[0033] TiB with a particle size of 100nm 2 Particles, 15um Al powder as raw materials, according to TiB 2The mass fraction is 15wt.% for batching. Wet ball milling was adopted, the ball milling medium was absolute ethanol, the mass ratio of ball to material was 8:1, the ball milling speed was 300r / min, and the ball milling time was 8h. After the ball-milled mixed powder is dried, put it into the SPS mold, increase the pressure to 40 MPa, and hold the pressure for 20 minutes to compact the mixed powder, then raise the temperature to 530°C, and maintain the sintering temperature and pressure for 10 minutes at the same time, and finally the composite material is The furnace was cooled to obtain a composite material with a diameter of 40 mm and a height of 15 mm. The density of the prepared composite material is 98.9%, the hardness is 73.3HV, TiB 2 The particle distribution is uniform, and there is no large amount of TiB 2 The particle agglomeration phenomenon, no shedding phe...

Embodiment 3

[0035] TiB with a particle size of 100nm 2 Particles and 15um Al powder are used as raw materials, and the ingredients are prepared according to the TiB2 mass fraction of 20wt.%. Dry ball milling was adopted, the ball milling tank was filled with argon gas, the mass ratio of balls to material was 10:1, the ball milling rate was 500r / min, and the ball milling time was 12h. After the ball-milled mixed powder is sieved, put it into the SPS mold, increase the pressure to 40MPa, and hold the pressure for 20 minutes to compact the mixed powder, then raise the temperature to 540°C, and maintain the sintering temperature and pressure for 10 minutes at the same time, and finally compound The material was cooled with the furnace to obtain a composite material with a diameter of 40 mm and a height of 15 mm. The density of the prepared composite material is 98.7%, the hardness is 84.6HV, TiB 2 The particle distribution is uniform, and there is no large amount of TiB 2 The particle aggl...

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Abstract

The invention relates to a method for preparing a TiB2 particle-reinforced Al matrix composite through SPS (spark plasma sintering) and belongs to the technical field of preparation of Al matrix composites. The method comprises implementation steps as follows: TiB2 particles and matrix powder are prepared according to designed components; ball-milling activation is performed, and activated mixed powder is obtained; the obtained mixed powder is contained in SPS equipment for SPS and is cooled with the furnace, and the TiB2 particle-reinforced Al matrix composite is obtained. According to the method, the preparation technology is simple, the production cycle is short, the sintering temperature is low, the temperature holding time is short, adverse reactions of reinforcing particles with a matrix can be avoided, the TiB2 particles are controllable in size and content, and the prepared composite is high in compactness and good in performance.

Description

technical field [0001] The invention relates to a method for preparing titanium boride particle-reinforced aluminum-based composite materials by spark plasma sintering, and belongs to the technical field of Al-based composite material preparation. Background technique [0002] Composite materials are composed of two or more materials with different properties. They have the characteristics of high designability and good comprehensive performance, which are unmatched by a single material. For Al-based composites, the addition of dispersed ceramic particles can effectively improve the material structure and material properties, so that the particle-reinforced Al-based composites have comprehensive properties such as high specific strength, high specific modulus, and good fatigue performance. It is widely used in aerospace, machinery, automobile and other fields. Currently TiB 2 The mainstream preparation methods of particle-reinforced Al-based composites are powder metallurg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C32/00C22C1/05B22F3/105
CPCB22F3/105C22C1/05C22C21/00C22C32/0073
Inventor 李红英欧阳勋
Owner CENT SOUTH UNIV
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