TiB2 reinforced aluminum alloy powder for additional material manufacturing and preparation method thereof

A technology of additive manufacturing and aluminum alloy, which is applied in the field of preparation of TiB2 reinforced aluminum alloy powder, can solve problems such as low strength, low mechanical properties, and complex design, and achieve the goals of improving powder performance, shortening the preparation process, and reducing preparation costs Effect

Inactive Publication Date: 2019-01-25
ADVANCED FOR MATERIALS & EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of science and technology, aerospace, weaponry and other fields put forward new requirements for light-weight and high-strength load-bearing structures, but these structures are often complex in design, cumbersome in processing procedures, and require high precision, which cannot be met by traditional production processes. Processing requirements for these structures
[0003] Laser selective melting additive manufacturing technology (SLM) can effectively solve the manufacturing bottleneck of traditional processes, but aluminum alloy has high laser reflectivity and low absorption rate, which has always been one of the most difficult materials for SLM.
At present, the powder materials for aluminum alloy SLM additive manufacturing are relatively fixed, mainly based on AlSi series (such as AlSi 12 , AlSi 7 Mg, AlSi 10 Mg, etc.), but its strength is not high, it can only reach 260-380MPa, which cannot meet the requirements of light weight and high strength in aerospace, weaponry and other fields.
[0004] Taking the 7-series aluminum alloy as an example, the 7-series aluminum alloy is known for its high strength, but recent studies have shown that this type of alloy is formed by laser selective melting, and its internal structure has a large number of holes, microcracks and other defects, and its mechanical properties are extremely low ( 100MPa); and other grades of aluminum alloys cannot meet the requirements of strength higher than 500MPa

Method used

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  • TiB2 reinforced aluminum alloy powder for additional material manufacturing and preparation method thereof
  • TiB2 reinforced aluminum alloy powder for additional material manufacturing and preparation method thereof
  • TiB2 reinforced aluminum alloy powder for additional material manufacturing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a. 97g of AlSi 10 Mg powder and 3g of TiB 2 powder mixed together, where TiB 2 The powder purity is 99.5%, the particle size range is 0-5μm, and the average particle size is 1.5μm; AlSi 10 The particle size range of Mg powder is 20-60μm, d 50 It is 42μm, the fluidity is 70s / 50g, and the sphericity is 90%.

[0036] b. Set the mass ratio of ball to material to 3:1, and 300g of grinding balls (by and The composition of the ball) is mixed with the mixed powder and put into a ball mill for ball milling. The overall ball milling time is 14 hours, and the ball milling speed is 200r / min.

[0037] By this method, TiB-containing 2 AlSi 10 The tensile strength of the Mg composite material powder can reach 530MPa by testing the universal mechanical testing machine.

Embodiment 2

[0039] a. 95g of AlSi 10 Mg powder and 5g of TiB 2 powder mixed together, where TiB 2 The powder purity is 99.6%, the particle size range is 0-5μm, and the average particle size is 2μm; AlSi 10 The particle size range of Mg powder is 20-60μm, d 50 It is 44μm, the fluidity is 68s / 50g, and the sphericity is 91%.

[0040] b. Set the mass ratio of ball to material to 4:1, mix 400g of balls with the mixed powder, put them into a ball mill for ball milling, and fill with argon gas for protection during the ball milling process. The overall ball milling time is 16 hours, and the ball milling speed is 350r / min.

[0041] Argon protection is filled during ball milling, which can effectively prevent the oxidation reaction of the aluminum alloy during the ball milling process, and the TiB thus prepared 2 Reinforced aluminum alloy powder, the tensile strength can reach 535MPa.

Embodiment 3

[0043] a. 94g of AlSi 10Mg powder and 6g of TiB 2 powder mixed together, where TiB 2 The powder purity is 99.7%, the particle size range is 0-5μm, and the average particle size is 2.5μm; AlSi 10 The particle size range of Mg powder is 20-60μm, d 50 It is 45μm, the fluidity is 63s / 50g, and the sphericity is 93%.

[0044] b. Set the mass ratio of ball to material to 5:1, put 500g of grinding balls (by and The grinding ball composition) is mixed with the mixed powder, and 0.5 parts by weight of stearic acid is added to the mixed powder as a process control agent, and they are put into a ball mill together for ball milling, and nitrogen protection is filled in the ball milling process. The overall ball milling time 18h, ball milling speed 450r / min.

[0045] Adding stearic acid into the mixed powder as a process control agent can prevent the excessive agglomeration of the aluminum alloy powder during the ball milling process, and the prepared TiB 2 Reinforced aluminum allo...

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Abstract

The invention provides TiB2 reinforced aluminum alloy powder for additional material manufacturing and a preparation method thereof. The preparation method comprises the following steps that (a) TiB2powder and aluminum alloy powder are mixed together to form mixed powder; (b) grinding balls and the mixed powder are mixed, and the mixture is put in a ball grinding machine for ball grinding treatment to obtain the TiB2 reinforced aluminum alloy powder. The TiB2 reinforced aluminum alloy powder prepared by adopting the method has good mechanical property, the tensile strength of the powder can reach 500 MPa or above, and the processing demand of SLM additional material manufacturing can be met.

Description

technical field [0001] The invention relates to the field of metal powder preparation, in particular to a TiB used for additive manufacturing 2 A preparation method for reinforced aluminum alloy powder. Background technique [0002] With the development of science and technology, aerospace, weaponry and other fields put forward new requirements for light-weight and high-strength load-bearing structures, but these structures are often complex in design, cumbersome in processing procedures, and require high precision, which cannot be met by traditional production processes. processing requirements for these structures. [0003] Laser selective melting additive manufacturing technology (SLM) can effectively solve the manufacturing bottleneck of traditional processes, but aluminum alloy has high laser reflectivity and low absorption rate, which has always been one of the most difficult materials for SLM. At present, the powder materials for aluminum alloy SLM additive manufact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04C22C1/05C22C21/08C22C1/10
CPCB22F9/04B22F2009/043C22C1/05C22C21/08
Inventor 李礼杨文郑璇戴煜
Owner ADVANCED FOR MATERIALS & EQUIP
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