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Graphene reinforced 3D printing mold steel powder and preparation method and application thereof

A 3D printing and graphene technology, which is applied in the field of graphene-enhanced 3D printing mold steel powder and its preparation, can solve the problems of destroying the Gr skeleton structure, metal powder fracture, and reducing mechanical properties, achieving high efficiency, increased hardness, The effect of high material utilization

Inactive Publication Date: 2018-12-07
CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, the matrix of metal matrix composites reinforced by Gr and its derivatives is mainly Al, Mg, Ti, Ni, Cu and other metals and alloys. There is little research on Gr and its derivatives reinforced iron-based (steel) composites. At the same time, the commonly used high-energy ball milling powder mixing process, the ball produces a continuous and violent impact on the mixed powder, causing repeated extrusion, cold welding and fracture to the metal powder, which may destroy the skeleton structure of Gr and introduce high-concentration defects. reduce its mechanical properties

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  • Graphene reinforced 3D printing mold steel powder and preparation method and application thereof
  • Graphene reinforced 3D printing mold steel powder and preparation method and application thereof

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[0033] The mold steel powder for graphene-enhanced 3D printing provided by the embodiments of the present invention is obtained by two-step method of ethanol solution dispersion and ball milling of raw materials, refer to figure 1 , the preparation method of the graphene-enhanced 3D printing mold steel powder of the present invention specifically comprises the following steps:

[0034] Step S101, dispersing graphene derivatives with a volume fraction of 0.5% to 2% in absolute ethanol, and ultrasonically oscillating to obtain a graphene derivative solution;

[0035] Step S102, adding mold steel powder with a volume fraction of 98% to 99.5% into the graphene derivative solution to obtain a mixed solution, and then ball milling the mixed solution to obtain a slurry;

[0036] Step S103, heating the slurry, stirring while heating until the slurry is in a semi-dry state. The criterion for judging that the slurry is in a semi-dry state is that the moisture content in the slurry is 5%...

Embodiment 1

[0045] Disperse the graphene nanosheets with a volume fraction of 1% in absolute ethanol, and ultrasonically vibrate for 1h in an ultrasonic cleaner to obtain a black graphene nanosheet solution; the S136 injection mold steel powder with a volume fraction of 99% is added to the In the graphene nanosheet solution, a mixed solution is obtained, and then the mixed solution is packaged in a ball mill jar and ball milled at a speed of 350r / min for 2.5h, the mass ratio of the ball to material is 40:1, and the ball diameter ratio is 5:4:3, The process is carried out under the protection of an argon atmosphere to prevent the powder from being oxidized. After the ball milling process, the slurry is obtained; pour the slurry into a beaker, move it into a water bath for heating, and set the temperature of the water bath to a constant temperature of 80°C while heating While stirring mechanically, stop stirring and heating when there is a small amount of liquid remaining in the beaker, and ...

Embodiment 2

[0055] Disperse graphite nanofibers with a volume fraction of 1.5% in absolute ethanol, and ultrasonically oscillate for 1 h in an ultrasonic cleaner to obtain a black graphite nanofiber solution; add H13 thermal mold powder with a volume fraction of 98.5% to graphite nanofibers In the fiber solution, a mixed solution was obtained, and then the mixed solution was packaged in a ball mill tank and ball milled at a speed of 350r / min for 2.5h. The mass ratio of the ball to material was 40:1, and the ball diameter ratio was 5:4:3. It is carried out under the protection of an air atmosphere to prevent the powder from being oxidized, and the slurry is obtained after the ball milling process; pour the slurry into a beaker, move it into a water bath for heating, and set the temperature of the water bath to a constant temperature of 80°C, and mechanically stir while heating , when a small amount of liquid remains in the beaker, the stirring and heating can be stopped, and after standing ...

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Abstract

The invention provides graphene reinforced 3D printing mold steel powder. The graphene reinforced 3D printing mold steel powder is prepared from raw materials which comprise 0.5%-2% of a graphene derivative and 98%-99.5% of mold steel powder according to the volume ratio. The invention further provides a preparation method of the graphene reinforced 3D printing mold steel powder. The preparation method comprises the following steps that the graphene derivative is dispersed into absolute ethyl alcohol, sonic oscillation is carried out, and a graphene derivative solution is obtained; the mold steel powder is added into the graphene derivative solution to obtain a mixed solution, and then the mixed solution is subjected to ball grinding to obtain slurry; the slurry is heated, and heating andstirring are carried out at the same time till the slurry is in a semi-dried state; and the semi-dried slurry is dried thoroughly, and the graphene reinforced 3D printing mold steel powder can be obtained. The two-step method of ethanol solution dispersing and ball grinding is adopted, the Van der Waals' force between agglomerated graphene can be effectively destroyed, an iron matrix of mold steelcannot be destroyed, and finally the graphene reinforced 3D printing mold steel powder which is uniform in mixing and forms a good bonding interface is obtained.

Description

technical field [0001] The invention relates to the technical fields of powder metallurgy and additive manufacturing, in particular to a mold steel powder for graphene-enhanced 3D printing and its preparation method and application. Background technique [0002] Mold plays a key role in supporting the manufacturing industry. The development of mold technology is also the development of product manufacturing technology. With the diversification of mold function requirements due to industrial development, the structural design of molds is becoming more and more complicated. Based on the uniqueness of mold complex cooling structure design, difficulty in manufacturing and rapid production requirements, at present, rapid manufacturing technology represented by SLM (selective laser melting) technology can rapidly form metal molds with complex structures, and has become the research hotspots in the field. As the most widely used mold material, steel can be divided into cold work ...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/04B22F3/105B33Y10/00B33Y70/00
CPCB22F1/0003B22F9/04B33Y10/00B33Y70/00B22F2009/042B22F2009/043B22F10/00B22F10/34B22F10/28B22F10/36B22F10/80Y02P10/25
Inventor 周燕文世峰陈柯宇段隆臣杨展方小红谭松成
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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