Double-phase submicron particle modified aluminum-based composite powder for 3D printing and preparation method of double-phase submicron particle modified aluminum-based composite powder

A dual-phase submicron, 3D printing technology, applied in additive manufacturing, metal processing equipment, process efficiency improvement, etc., can solve the problems of easy oxidation and high preparation cost, achieve good powder sphericity, reduce preparation cost, laser The effect of increasing the absorption rate

Pending Publication Date: 2022-04-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ti elements are added to aluminum alloys in the form of nano-Ti particles or pre-alloyed respectively. However, Ti elements exist in the form of nano-sized and pre-alloyed powders are easily oxidized, and the preparation costs of both are relatively high.

Method used

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  • Double-phase submicron particle modified aluminum-based composite powder for 3D printing and preparation method of double-phase submicron particle modified aluminum-based composite powder
  • Double-phase submicron particle modified aluminum-based composite powder for 3D printing and preparation method of double-phase submicron particle modified aluminum-based composite powder
  • Double-phase submicron particle modified aluminum-based composite powder for 3D printing and preparation method of double-phase submicron particle modified aluminum-based composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1: Weigh 95.5g of 6061 aluminum alloy powder and 0.5g of TiH in a vacuum glove box 2 For ceramic particles, put the mixed powder into a ball mill jar and add stainless steel balls. The ball-to-material ratio during the ball milling process is 5:1.

[0041] Step 2: Fill the ball mill jar with argon as a protective gas.

[0042] The third step: carry out intermittent ball milling. The ball milling speed was 125 r / min, and the ball milling time was 3 h, and the aluminum matrix composite powder was finally obtained.

[0043] Step 4: Take out the composite powder in the vacuum ball mill tank in the vacuum glove box, and carry out vacuum packaging.

[0044] After the above steps, submicron TiH can be prepared 2 Composite powder with a mass fraction of 0.5 %, TiH prepared by SLM process 2 After / 6061 composite powder, such as Figure 5 The number of thermal cracks in the SLM formed sample shown is relatively small but still exists. The tensile strength reaches 120MPa...

Embodiment 2

[0046] Step 1: Weigh 99g of 6061 aluminum alloy powder and 1g of TiH in a vacuum glove box 2 For ceramic particles, put the mixed powder into a ball mill jar and add stainless steel balls. The ball-to-material ratio during the ball milling process is 5:1.

[0047] The second step: fill the ball mill jar with argon.

[0048] The third step: carry out intermittent ball milling. The ball milling speed was 130r / min, and the ball milling time was 4 h, and the aluminum matrix composite powder was finally obtained.

[0049] Step 4: Take out the composite powder in the vacuum ball mill tank in the vacuum glove box, and carry out vacuum packaging.

[0050] After the above steps, submicron TiH can be prepared 2 Composite powder with a mass fraction of 1%, TiH prepared by SLM process 2 After the / 6061 composite powder, the cracks in the SLM formed sample have been completely eliminated, and the tensile strength has reached 270MPa and the elongation has reached 18% as measured by the ...

Embodiment 3

[0052] Step 1: Weigh 98g of 6061 aluminum alloy powder and 1g of TiH in a vacuum glove box 2 Ceramic particles and 1g of Mg 2 Si ceramic particles, put the mixed powder in the ball mill jar, and add stainless steel balls, the ball-to-material ratio during the ball milling process is 5:1.

[0053] The second step: fill the ball mill jar with argon.

[0054] The third step: carry out intermittent ball milling. The ball milling speed was 130 r / min, the ball milling time was 5 h, and the aluminum matrix composite powder was finally obtained.

[0055] Step 4: Take out the composite powder in the vacuum ball mill tank in the vacuum glove box, and carry out vacuum packaging.

[0056] After the above steps, submicron TiH can be prepared 2 Mass fraction is 1%, submicron Mg 2 The mass fraction of Si is 1%, and the two are uniformly dispersed on the composite powder of AA6061 matrix powder. Formed by SLM process (TiH 2 +Mg 2 Si) / 6061 composite powder, its tensile strength reaches...

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Abstract

The invention discloses biphase submicron particle modified aluminum-based composite powder for 3D printing and a preparation method of the biphase submicron particle modified aluminum-based composite powder. The composite powder is prepared from micron-sized 6XXX series aluminum alloy powder, submicron TiH2 ceramic particles and submicron Mg2Si ceramic particles. The method comprises the following steps: putting biphase submicron ceramic particles, micron-sized 6XXX series aluminum alloy powder and a ball milling medium into a ball milling tank under the protection of inert gas to prevent the oxygen content of the composite powder from being increased; and low-energy ball milling is conducted on a ball mill, the biphase submicron particles are evenly assembled on the aluminum alloy powder through collision of a ball milling medium and the powder, and the biphase submicron particle reinforced aluminum-based composite powder is obtained. A part prepared from the composite powder through a selective laser melting forming method is obviously refined in grain, the strength, plasticity, hardness and other properties are obviously improved, the comprehensive mechanical property is obviously superior to the property of a forged 6XXX series aluminum alloy subjected to heat treatment of T6 of the same model, and the part is applied to the fields of aerospace and the like.

Description

technical field [0001] The invention belongs to the technical field of aluminum-based composite materials and additive manufacturing, and specifically relates to a dual-phase submicron particle-modified aluminum-based composite powder for 3D printing and a preparation method thereof. Background technique [0002] Additive manufacturing technology has emerged with the demand for individualization in the modern society, and the materials used have also transitioned from the initial resin and plastic to metal materials, ceramic materials, polymer materials, etc. At present, additive manufacturing technologies belonging to metal materials include laser selective melting forming, electron beam selective melting technology (Electron Beam Selective Melting, EBSM), laser melting deposition technology (Laser Melting Deposition, LMD) and so on. Among them, SLM technology has attracted wide attention because of its high manufacturing precision and good forming quality. It has made grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C32/00B22F9/04B22F1/065B22F1/16B22F10/28B33Y10/00B33Y70/10
CPCC22C21/00C22C32/00B22F9/04B22F10/28B33Y70/10B33Y10/00B22F2009/043Y02P10/25
Inventor 刘允中肖小军程文
Owner SOUTH CHINA UNIV OF TECH
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