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Alti composite casting preparation method

A technology of castings and molds, which is applied in the field of preparation of AlTi composite parts, can solve problems such as insufficient bonding strength, and achieve the effects of high density, high specific strength, strengthening metallurgical bonding and mechanical bonding

Inactive Publication Date: 2020-04-28
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defect of insufficient bonding strength of AlTi composite castings existing in the prior art, the present invention provides a method for preparing AlTi composite castings. The method uses selective laser melting technology to prepare Ti-based lattice materials on the bonding surface of titanium-based materials, and then uses liquid Combination of titanium-based materials and aluminum alloys by solid composite casting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] AlTi composite casting preparation method, comprises the steps:

[0017] (1) Prepare Ti-based lattice materials by laser selective melting technology on the bonding surface of titanium-based materials;

[0018] (2) Use chemical degreasing-activation to treat the surface of the lattice material;

[0019] (3) Fix the titanium-based material in the mold, pour the aluminum alloy melt into the mold, and adopt a centrifugal casting process during the pouring and solidification process to realize the combination between AlTi.

[0020] Wherein, the activation treatment uses an activation solution containing hydrofluoric acid. The range of centrifugal casting process parameters is: pouring temperature 680-850°C, mold temperature 280-420°C, rotational speed 300-1200r / min. The structure type of lattice material is pyramid or tetrahedron; the range of structural parameters of lattice material is: rod length 0.8-3mm, rod diameter 0.3-1.5mm, and angle between rods 30-60°.

Embodiment 1

[0022] The titanium-based lattice material is TC4 alloy, the structure is pyramid-shaped, the rod length is 1.5mm, the rod diameter is 0.4mm, and the angle between the rods is 45°. Selected area laser melting molding process parameters: laser power 170W, scanning speed 1250mm / s, spot diameter 0.1mm, powder layer thickness 0.03mm, scanning distance 0.1mm, to prepare titanium-based lattice materials.

[0023] Surface treatment: use anhydrous sodium carbonate Na2CO3 (30g / L), sodium hydroxide NaOH (40g / L), trisodium phosphate Na3PO4 (35g / L), and the rest is water for chemical degreasing treatment. Use 435mL / L dimethylformamide, 105mL / L 38% hydrofluoric acid, and water as the balance, and activate at room temperature for 7 minutes.

[0024] Centrifugal casting process parameters: aluminum alloy ZL107 pouring temperature 710°C, mold temperature 300°C, speed 650r / min.

[0025] It is detected that the shear strength of the AlTi interface can reach 255MPa.

Embodiment 2

[0027] The titanium-based lattice material is TC6, the structure is tetrahedral, the rod length is 2mm, the rod diameter is 0.6mm, and the angle between the rods is 45°. Selective laser melting process parameters: laser power 150W, scanning speed 750mm / s, spot diameter 0.2m, powder layer thickness 0.03mm, scanning distance 0.15mm, to prepare lattice materials.

[0028] Surface treatment: chemical degreasing treatment with anhydrous sodium carbonate Na2CO3 (30g / L), sodium hydroxide NaOH (40g / L), trisodium phosphate Na3PO4 (35g / L), and water. Use 435mL / L dimethylformamide, 105mL / L 38% hydrofluoric acid, and water as the balance, and activate at room temperature for 7 minutes.

[0029] Centrifugal casting process parameters: aluminum alloy ZL111 pouring temperature 750°C, mold temperature 320°C, speed 600r / min.

[0030] It is detected that the shear strength of AlTi interface can reach 260MPa.

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Abstract

The invention discloses a method for preparing an AlTi composite casting, which comprises the following steps: (1) preparing a Ti-based lattice material by laser selective melting technology on the bonding surface of a titanium-based material; (2) adopting chemical degreasing-activation to align the lattice (3) Fix the titanium-based material in the mold, pour the aluminum alloy melt into the mold, and use a centrifugal casting process during the pouring and solidification process to achieve the combination between AlTi. The interface of the composite casting obtained by this preparation method presents a three-dimensional shape, which is different from the traditional way of bonding between planes. The bonding of the present invention makes full use of the pores of the lattice structure, has high bonding strength and is not easy to fall off, and realizes the bonding between AlTi and AlTi. The firm combination of these materials gives full play to the characteristics of aluminum alloy and titanium alloy materials.

Description

technical field [0001] The invention relates to the preparation technology of AlTi composite parts, in particular to a preparation method of AlTi composite castings. Background technique [0002] As an extremely abundant metal in the earth's crust, aluminum is widely used in aerospace, transportation, and construction machinery due to its low density, good corrosion resistance, and formability. Second only to iron and steel, it plays a particularly important role in the development of the national economy. Titanium alloy has excellent high temperature performance, corrosion resistance, good fracture toughness and higher specific strength, and is also an ideal material that can meet the requirements of lightweight. At present, because of its high price, it is mainly used in high-tech fields such as aerospace and deep sea. Aluminum alloy and titanium alloy are highly complementary in terms of performance and economy. In some environments, the composite structure of the two ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/16B22D13/00B22F3/105B33Y10/00
CPCB22D13/00B22D19/0081B22D19/16B33Y10/00B22F10/00B22F10/28Y02P10/25
Inventor 赵建华
Owner CHONGQING UNIV