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Method for preparing composite powder for 3D printing, product and application

A composite powder and 3D printing technology, which is applied in the field of additive manufacturing, can solve the problem that commercial pre-alloyed powder cannot fully meet the requirements of high-performance component manufacturing, and achieve the effect of inhibiting the growth of grains and avoiding agglomeration

Active Publication Date: 2016-05-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, commercial pre-alloyed powders produced by atomization methods cannot fully meet the requirements for the manufacture of high-performance components.

Method used

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  • Method for preparing composite powder for 3D printing, product and application
  • Method for preparing composite powder for 3D printing, product and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 This example is used to prepare W 6 Mo 5 Cr 4 V 2 High carbon and high alloy tool steel.

[0037] W 6 Mo 5 Cr 4 V 2 It is a high-carbon and high-alloy tool steel suitable for high-speed cutting. It is easy to introduce impurity elements such as S and P in the traditional heat treatment process, which weakens the mechanical properties of the alloy to a certain extent. Moreover, the traditional preparation process of cutting tools is complicated and the cycle It's also relatively long. SLM is particularly suitable for the processing of such small cutting tools. The forming process is carried out in a vacuum environment. The composition of the product depends only on the composition of the initial powder, and the purity is very high. Therefore, considering that high-energy laser processing will cause a small amount of volatilization of the elements, and then determine the mass ratio of the initial powder according to the chemical composition of the high-speed tool s...

Embodiment 2

[0046] Embodiment 2 This embodiment is used to prepare a nickel-based superalloy turbine blade.

[0047] Nickel-based superalloys have high strength and good oxidation resistance and gas corrosion resistance in the range of 650℃~1000℃, and are widely used in aerospace hot end parts. For example, Inconel625 is a nickel-based superalloy that has been studied in SLM technology. Due to the extremely fast cooling rate during the SLM forming process, Inconel625 has extremely large micro-residual stress, which is easy to produce micro-cracks at the grain contact boundary, causing the failure of the formed part. In order to suppress the formation of micro-cracks during the SLM forming process, by optimizing the composition of the material and improving the toughness of the material, SLM forming technology can be used to prepare nickel-based superalloy parts with higher strength and toughness. Specifically:

[0048] It includes the following steps:

[0049] S1: First, determine the mass per...

Embodiment 3

[0055] Example 3 This example is used to prepare titanium alloy porcelain teeth.

[0056] Titanium alloys are widely used in aerospace, medical, chemical and other fields because of their high strength, good corrosion resistance, high heat resistance, and good biological compatibility. For example, Ti6Al4V has high strength and good biocompatibility, and can be used to prepare various biological implants such as porcelain teeth and joints. Biological implants have high requirements for wear resistance and strength. Traditional methods The prepared implants tend to have relatively coarse grains and poor performance, and it is difficult to meet the individual requirements of customers. The composite powder is selected and then SLM technology can be used to prepare nano titanium-based alloy porcelain teeth, which have excellent wear resistance and strength, and can also meet the needs of different patients. Specifically:

[0057] It includes the following steps:

[0058] S1: First, d...

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Abstract

The invention discloses a method for preparing a composite powder for 3D printing, and belongs to the technical field of material additive manufacturing. The method comprises the following steps: S1, executing mechanical mixing on a metal matrix phase powder and a nano-ceramic strengthening phase powder to obtain a mixed powder; and S2, executing a ball-milling process on the mixed powder to obtain an alloyed powder, wherein a ball-milling medium used in ball-milling is spherical and has a diameter of 6-10mm, a ball-to-powder ratio is 8: 1 to 10: 1, a distance from a ball-milling tank to a rotary centre is 15-30cm, a rotational speed is 150-200rpm, a ball-milling time is 6-8h, and the composite powder is obtained. The invention further provides a method for using the composite powder prepared by the above-mentioned method for 3D printing forming for parts. The composite powder prepared by the method disclosed by the invention is free from micro-cracks and the problem of supersaturated solid solution, and has no high internal stress; and the parts prepared by virtue of the composite powder disclosed by the invention through a selective laser melting forming method have good comprehensive performance.

Description

Technical field [0001] The invention belongs to the technical field of additive manufacturing, and relates to a preparation method, product and application of a special metal powder material for 3D printing. Background technique [0002] Additive manufacturing technology (also known as rapid prototyping or 3D printing) and traditional iso-material manufacturing (casting, forging and welding) and subtractive manufacturing (turning and milling) are three pillars. It is a high integration of information technology and manufacturing technology to achieve controllable manufacturing. technology. Based on the 3D CAD data, the additive manufacturing technology is controlled by the computer to accumulate the materials layer by layer to produce solid parts without the need for tools, fixtures and multiple processing procedures. [0003] This technology can be used to form and manufacture two-dimensional thin-layer structures, which can greatly reduce the difficulty of forming and manufactur...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F1/00B33Y70/00B33Y10/00
CPCB22F1/0003B22F10/00B22F10/36B22F10/28B22F10/366B22F10/32Y02P10/25
Inventor 宋波王志伟赵晓文世峰魏青松史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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