Grain-mixing strengthened aluminum-base composite material

Abstract

The present invention is a kind of grain-mixing strengthened Al-base composite material, and belongs to the field of composite material technology. The Al-base composite material consists of Al2O3 grain 1-30 wt%, TiB2 grain 1-30 wt%, and Al or Al alloy for the rest, and has molar ratio between TiB2 grain and Al2O3 grain of 1 to 1. The spherical Al2O3 grain and cubic and cuboid TiB2 grain in the size of 50-300 nm are distributed inside the substrate homogeneously in clean interface. The dispersed TiB2 grain and Al2O3 grain strengthen the composite material and make the composite material possess obviously raised strength and modulus.

Description

technical field

[0001] The invention relates to an aluminum-based material in the technical field of composite materials, in particular to a particle-mixed reinforced aluminum-based composite material. Background technique

[0002] Aluminum matrix composites have high specific strength, high specific modulus and high specific stiffness, and are widely used in aerospace, national defense, industry and other fields. The traditional preparation method of aluminum matrix composites is to add reinforcing particles to the aluminum matrix. Due to the poor wettability between the reinforcing particles and the matrix, the interface reaction is difficult to control, and the reinforcing particles are unevenly distributed in the aluminum matrix. Properties of aluminum matrix composites. At the same time, the preparation process of using external particles is complicated and the cost is high, which is not conducive to popularization and application. Hybrid reinforcement can improve the...

Examples

Embodiment 1

[0017] The composition and weight percent of present embodiment material are: TiB 2 Particle 1%, Al 2 o 3 Particles 1%, the balance is Al.

[0018] After the aluminum ingot was melted, protected by Ar gas, the temperature was raised to 850°C, and Na 2 B 4 o 7 、K 2 TiF 6 Mix evenly and add to the melt after drying at 150°C for 2 hours, and then stir at a stirring speed of 200 rpm for 10 minutes. After the reaction is over, take out the slag, pour Ar gas into the melt for degassing and refining, remove the scum, and then let it stand for 10 minutes at a temperature of 680°C and pour it into a mold. TiB 2 1%, Al 2 o 3 1% composite material ingot, after the ingot is extruded, it is treated with T6.

[0019] Al in the composite 2 o 3 and TiB 2 The particle size is 50-300nm, Al 2 o 3 Particles are round, TiB 2 The particles are hexagonal and cuboid. The material is dense and uniform, Al 2 o 3 and TiB 2 Enhanced particle dispersion in the matrix, Al 2 o 3 and ...

Embodiment 2

[0021] The composition and weight percent of present embodiment material are: TiB 2 Particle 15%, Al 2 o 3 Particles 15%, the balance is Al alloy 2024.

[0022] After the aluminum ingot is melted, it is protected by Ar gas, and the temperature is raised to 950 °C, and Na with a mass ratio of 1:1.2 2 B 4 o 7 、K 2 TiF 6 Mix evenly, dry at 200°C for 4 hours, add to the melt, and stir at a stirring speed of 300 rpm for 40 minutes. After the reaction, take out the reacting slag, add alloy elements, pass Ar gas into the melt for degassing and refining, remove the scum, and then stand still for 15 minutes at a standing temperature of 740 ° C, pour it into a mold, and obtain TiB-containing 2 15%, Al 2 o 3 15% Composite Ingot. After extruding the ingot, T6 heat treatment.

[0023] Al in the composite 2 o 3 and TiB 2 The particle size is 50-300nm, Al 2 o 3 Particles are round, TiB 2 The particles are hexagonal and cuboid. The material is dense and uniform, Al 2 o 3...

Embodiment 3

[0025] The composition and weight percent of present embodiment material are: TiB 2 Particle 30%, Al 2 o 3 Particles 30%, the balance is Al alloy 7075.

[0026] After the aluminum ingot was melted, protected by Ar gas, the temperature was raised to 1100°C, and Na2 B 4 o 7 、K 2 TiF 6 Mix evenly and add to the melt after drying at 250°C for 5 hours, and then stir at a stirring speed of 500 rpm for 60 minutes. After the reaction, take out the reacting slag, add alloy elements, pass Ar gas into the melt for degassing and refining, remove the scum, and then let it stand for 30 minutes at a temperature of 780°C, pour it into a mold, and obtain TiB-containing slag. 2 30%, Al 2 o 3 30% composite ingots. After the ingot is extruded, T6 heat treatment is performed.

[0027] Al in the composite 2 o 3 and TiB 2 The particle size is 50-300nm, Al 2 o 3 Particle shape is round, TiB 2 The particles are mainly hexagonal and cuboid. The material is dense and uniform, Al 2 o ...

technical field

[0001] The invention relates to an aluminum-based material in the technical field of composite materials, in particular to a particle-mixed reinforced aluminum-based composite material. Background technique

[0002] Aluminum matrix composites have high specific strength, high specific modulus and high specific stiffness, and are widely used in aerospace, national defense, industry and other fields. The traditional preparation method of aluminum matrix composites is to add reinforcing particles to the aluminum matrix. Due to the poor wettability between the reinforcing particles and the matrix, the interface reaction is difficult to control, and the reinforcing particles are unevenly distributed in the aluminum matrix. Properties of aluminum matrix composites. At the same time, the preparation process of using external particles is complicated and the cost is high, which is not conducive to popularization and application. Hybrid reinforcement can improve the...

Examples

Embodiment 1

[0017] The composition and weight percent of present embodiment material are: TiB 2 Particle 1%, Al 2 o 3 Particles 1%, the balance is Al.

[0018] After the aluminum ingot was melted, protected by Ar gas, the temperature was raised to 850°C, and Na 2 B 4 o 7 、K 2 TiF 6 Mix evenly and add to the melt after drying at 150°C for 2 hours, and then stir at a stirring speed of 200 rpm for 10 minutes. After the reaction is over, take out the slag, pour Ar gas into the melt for degassing and refining, remove the scum, and then let it stand for 10 minutes at a temperature of 680°C and pour it into a mold. TiB 2 1%, Al 2 o 3 1% composite material ingot, after the ingot is extruded, it is treated with T6.

[0019] Al in the composite 2 o 3 and TiB 2 The particle size is 50-300nm, Al 2 o 3 Particles are round, TiB 2 The particles are hexagonal and cuboid. The material is dense and uniform, Al 2 o 3 and TiB 2 Enhanced particle dispersion in the matrix, Al 2 o 3 and ...

Embodiment 2

[0021] The composition and weight percent of present embodiment material are: TiB 2 Particle 15%, Al 2 o 3 Particles 15%, the balance is Al alloy 2024.

[0022] After the aluminum ingot is melted, it is protected by Ar gas, and the temperature is raised to 950 °C, and Na with a mass ratio of 1:1.2 2 B 4 o 7 、K 2 TiF 6 Mix evenly, dry at 200°C for 4 hours, add to the melt, and stir at a stirring speed of 300 rpm for 40 minutes. After the reaction, take out the reacting slag, add alloy elements, pass Ar gas into the melt for degassing and refining, remove the scum, and then stand still for 15 minutes at a standing temperature of 740 ° C, pour it into a mold, and obtain TiB-containing 2 15%, Al 2 o 3 15% Composite Ingot. After extruding the ingot, T6 heat treatment.

[0023] Al in the composite 2 o 3 and TiB 2 The particle size is 50-300nm, Al 2 o 3 Particles are round, TiB 2 The particles are hexagonal and cuboid. The material is dense and uniform, Al 2 o 3...

Embodiment 3

[0025] The composition and weight percent of present embodiment material are: TiB 2 Particle 30%, Al 2 o 3 Particles 30%, the balance is Al alloy 7075.

[0026] After the aluminum ingot was melted, protected by Ar gas, the temperature was raised to 1100°C, and Na2 B 4 o 7 、K 2 TiF 6 Mix evenly and add to the melt after drying at 250°C for 5 hours, and then stir at a stirring speed of 500 rpm for 60 minutes. After the reaction, take out the reacting slag, add alloy elements, pass Ar gas into the melt for degassing and refining, remove the scum, and then let it stand for 30 minutes at a temperature of 780°C, pour it into a mold, and obtain TiB-containing slag. 2 30%, Al 2 o 3 30% composite ingots. After the ingot is extruded, T6 heat treatment is performed.

[0027] Al in the composite 2 o 3 and TiB 2 The particle size is 50-300nm, Al 2 o 3 Particle shape is round, TiB 2 The particles are mainly hexagonal and cuboid. The material is dense and uniform, Al 2 o ...