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Preparation of in situ self-generated tib based on slm 2 Methods of Strengthening Composite Materials

A reinforced composite material, in-situ self-generated technology, applied in the direction of additive processing, etc., can solve problems such as easy oxidation, difficult forming process, and reduced material plasticity

Active Publication Date: 2019-11-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aluminum and its alloys bring great difficulties to the forming process due to their poor fluidity, high laser reflectivity, high thermal conductivity, and easy oxidation. Currently, only Al10SiMg and Al12Si with better fluidity can be obtained on SLM. research and application
However, as a brittle phase, the Si phase will reduce the plasticity of the material while increasing the strength, which hinders the application of SLM-based aluminum matrix composites in aerospace, national defense and military industries.

Method used

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  • Preparation of in situ self-generated tib based on slm <sub>2</sub> Methods of Strengthening Composite Materials
  • Preparation of in situ self-generated tib based on slm <sub>2</sub> Methods of Strengthening Composite Materials
  • Preparation of in situ self-generated tib based on slm <sub>2</sub> Methods of Strengthening Composite Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) in KBF 4 、K 2 TiF 6 The powder is used as the raw material, and the in-situ self-generated 2.5wt% TiB is prepared by the mixed salt reaction method (LSM) 2 / Al7SiCu0.5Mg composite material;

[0026] (2) The powder is prepared by vacuum air atomization technology, the melt temperature is 1000°C, the Ar gas is used for protection and gas atomization, the air pressure is 4.5MPa, and the nozzle diameter is 0.5mm; figure 1 shown;

[0027] (3) Use the software SolidWorks to draw the three-dimensional graphics of the required processing samples, the graphics are 10*10*10mm cubes and standard tensile sheets, and save them in STL format;

[0028] (4) The SLM sample is prepared using a metal 3D printer, such as figure 2 and image 3 As shown, the laser power is 370W, the scanning speed is 1300mm / s, the layer thickness is 30μm, and the scanning distance is 0.19mm. During the printing of the first five layers, a grid is added to spread the powder evenly on the substrate...

Embodiment 2

[0031] (1) in KBF 4 、K 2 TiF 6 The powder is used as the raw material, and the in-situ self-generated 2.5wt% TiB is prepared by the mixed salt reaction method (LSM) 2 / Al7SiCu0.5Mg composite material;

[0032] (2) The powder is prepared by vacuum air atomization technology, the melt temperature is 1200°C, the mixed gas of Ar and H2 is used for protection and gas atomization, the air pressure is 9.5MPa, and the diameter of the nozzle is 2mm; the particle size of the sieved powder is 30- 50μm powder;

[0033] (3) Use the software SolidWorks to draw the three-dimensional graphics of the required processing samples, the graphics are 10*10*10mm cubes and standard tensile sheets, and save them in STL format;

[0034] (4) SLM samples were prepared using a metal 3D printer, where the laser power was 370W, the scanning speed was 1300mm / s, the layer thickness was 30μm, and the scanning distance was 0.19mm. During the printing of the first five layers, a grid is added to spread the ...

Embodiment 3

[0037] (1) in KBF 4 、K 2 TiF 6 The powder is used as the raw material, and the in-situ self-generated 2.5wt% TiB is prepared by the mixed salt reaction method (LSM) 2 / Al7SiCu0.5Mg composite material;

[0038] (2) The powder is prepared by vacuum air atomization technology, the melt temperature is 1000°C, protected by He gas and atomized, the air pressure is 5.5MPa, and the diameter of the nozzle is 3mm; the powder with a particle size of 15-53μm is left after sieving;

[0039] (3) Draw the three-dimensional graphics of the required processing samples through the software SolidWorks, the graphics are 10*10*6mm cubes and standard tensile sheets, and save them in STL format;

[0040] (4) SLM samples were prepared using a metal 3D printer, where the laser power was 370W, the scanning speed was 1000mm / s, the layer thickness was 30μm, and the scanning distance was 0.19mm. During the printing of the first five layers, a grid is added to spread the powder evenly on the substrate....

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Abstract

The invention provides a method for preparing an in-situ self-generated TiB2 reinforced composite material based on SLM. The method comprises the following steps of A1, taking KBF4 and K2TiF6 powdersas raw materials, and using a mixed salt reaction method for preparing the in-situ self-generated TiB2 nano-particle reinforced Al7SiCu 0.5Mg composite material; A2, carrying out vacuum atomization onthe composite material obtained in the step A1 to obtain a composite material powder; and A3, carrying out 3D printing on the composite material powder to obtain a SLM sample. According to the methodfor preparing the in-situ self-generated TiB2 reinforced composite material, the SLM is adopted to prepare the in-situ self-generated TiB2 nano-particle reinforced Al7SiCu 0.5Mg composite material, the microstructure of the composite material is greatly refined, and obvious holes or cracks are not observed in the composite material; and moreover, the strength is greatly improved on the premise that the plasticity is guaranteed, and huge application potential is obtained in the aerospace field.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and metal technology, in particular to a method for preparing in-situ self-generated TiB based on laser selective melting (SLM) 2 A method for nanoparticle reinforcement of Al7SiCu0.5Mg composites. Background technique [0002] The rapid development of aerospace, national defense and military industries has put forward new requirements for the mechanical properties of materials and the complexity of structures. In situ self-generated TiB 2 Nanoparticle-reinforced aluminum matrix composites have broad application prospects due to their advantages such as low density, high specific strength, and large specific modulus. However, the traditional preparation process has been difficult to meet the demand for complex structures in the above fields, and the in situ self-generated TiB 2 The combination of nanoparticle-reinforced aluminum matrix composites and laser additive manufacturing technology s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C32/00C22C1/04C22C1/10B33Y10/00B33Y70/00
CPCB33Y10/00B33Y70/00C22C1/0416C22C1/1026C22C21/02C22C32/0073
Inventor 吴一陈哲廉清李险峰章敏立王浩伟
Owner SHANGHAI JIAO TONG UNIV
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