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Preparation method of graphene alloy nanocomposite and SLM (Selective Laser Melting) forming process

A technology of nanocomposite materials and olefin alloys, which is applied in the fields of metal matrix nanocomposites and metal additive manufacturing, can solve the problems of deteriorating material performance and difficult matching of reinforcements, so as to improve strength and toughness, change microstructure, Effect of Reducing Hot Cracking Tendency

Inactive Publication Date: 2019-03-12
NAT INST CORP OF ADDITIVE MFG XIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For ceramic particle-reinforced metal matrix composites, the matching selection of the reinforcement is not easy. Once the interface bonding effect and wettability between the reinforcement and the metal material are poor, the introduction of ceramic particles may not play a reinforcing role, but instead May be counterproductive, deteriorating material properties

Method used

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  • Preparation method of graphene alloy nanocomposite and SLM (Selective Laser Melting) forming process
  • Preparation method of graphene alloy nanocomposite and SLM (Selective Laser Melting) forming process
  • Preparation method of graphene alloy nanocomposite and SLM (Selective Laser Melting) forming process

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preparation example Construction

[0036] A preparation method of graphene alloy nano composite material, comprising the following steps:

[0037] a. Take graphene powder, graphene powder particle size ≤ 2 μm, graphene is few-layer graphene, and the mass of few-layer graphene with layer number ≤ 5 in the obtained graphene nano-powder is not less than 70% of the total graphene powder mass , the mass of few-layer graphene with the number of layers ≥ 11 is not more than 5% of the mass of the total graphene powder;

[0038] b. Mix the graphene powder and absolute ethanol at a volume ratio of 1: (200-2000) to obtain a graphene-absolute ethanol suspension, place the graphene powder in absolute ethanol, and ultrasonically vibrate for not less than 2 hours. Through sufficient vibration dispersion, it is configured into a graphene-absolute ethanol suspension;

[0039] c, mixing the obtained graphene-dehydrated ethanol suspension with the superalloy powder to obtain a mixture A, so that the graphene content in the graph...

Embodiment 1

[0047] (1) Use K418 nickel-based superalloy material as the matrix and 0.1g graphene as the nanocomposite reinforcement to prepare graphene-enhanced K418 nanocomposite material (GNPs / K418), and the original K418 powder is normally distributed with a particle size of 15-53μm spherical powder, such as Figure 5 As shown, the graphene powder presents a lamellar shape, the proportion of graphene layers ≤ 5 is 72.55%, the proportion of graphene layers ≥ 11 is 3.03%, and the average particle size is 1 μm, such as figure 2 shown;

[0048] (2) 0.1g graphene powder is added in dehydrated alcohol, is configured into graphene powder mass fraction and is 0.1% suspension liquid, and ultrasonic vibration 2h is mixed in dehydrated alcohol until graphene powder; Will be by 0.1 The suspension mixed with 1 g graphene powder and absolute ethanol is poured into 100 g of K418 alloy powder, and the composite alloy powder is placed in a ball mill for wet milling for 4 hours by mechanical alloying,...

Embodiment 2

[0053] (1) With 100g K418 nickel-based superalloy material as matrix, 1g graphene as nanocomposite reinforcement, prepare graphene reinforced K418 nanocomposite material (GNPs / K418);

[0054] (2) Add 1g of graphene powder into dehydrated ethanol, configure graphene powder mass fraction as 0.1% suspension, ultrasonically vibrate for 2.5h until graphene powder is mixed evenly into dehydrated ethanol; The suspension mixed with graphene powder and absolute ethanol was poured into 100g of K418 alloy powder, and the composite alloy powder was placed in a ball mill for wet grinding for 6 hours by mechanical alloying method, the ball-to-material ratio was set to 15:1, and the rotational speed was Set as 240rpm, add Ar gas during the whole process to obtain mixed slurry A;

[0055] (3) Take out the protection of absolute ethanol in the mixed slurry A: after standing for 38 hours, dry the mixed powder for 24 hours under vacuum at 105°C, with a vacuum degree of 1×10 -2 Pa; carry out pla...

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Abstract

The invention discloses a preparation method of a graphene alloy nanocomposite and an SLM (Selective Laser Melting) forming process. According to the preparation method, turbid liquid is prepared through the ultrasonic vibration of anhydrous ethanol, so that the graphene is uniformly dispersed in the anhydrous ethanol, the graphene is uniformly dispersed, then after the graphene anhydrous ethanolturbid liquid is mixed with high-temperature alloy in proportion, the graphene and partial residue are distributed in the grain boundary and crystals by participating in the interfacial reaction, so that the strength and toughness of a formed part are improved, and the hot cracking tendency is reduced; the addition of graphene changes the organization form of the material; and in the SLM forming process, the graphene in the graphene high temperature alloy nanocomposite is used as a heterogeneous nucleating agent, and increases the nucleation rate in the solidification crystallization process.The graphene high temperature alloy nanocomposite is prepared by the dielectric barrier discharge plasma-assisted ball milling technique. The plasma enhances the activity of powder, so that columnar crystals preferentially growing change to isometric crystals, grains are refined and the performances are improved.

Description

technical field [0001] The invention relates to the fields of metal-based nanocomposite materials and metal additive manufacturing, and relates to a preparation method of a graphene alloy nanocomposite material and an SLM forming process. Background technique [0002] Nickel-based superalloys are based on nickel and generally work under certain stress conditions in the range of 600 ° C to 1000 ° C. It is not only a high temperature alloy with good high temperature oxidation resistance and gas corrosion resistance, but also has a high temperature strength, durability and creep strength, and good fatigue resistance. With the rapid development of aerospace and national defense technology, many hot-end components are subject to higher and higher temperatures, such as combustion chambers, turbine blades, engine cylinder heads and pistons. Therefore, new and higher requirements are put forward for the structure, mechanical properties, and physical properties of such key component...

Claims

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Application Information

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IPC IPC(8): B22F9/04C22C1/10B22F3/105B22F1/00C22C1/05C22C19/03C22C33/02C22C38/10C22C38/08B33Y10/00B02C17/10B02C17/18
CPCB22F1/0003C22C1/05C22C19/03C22C33/02C22C38/105B02C17/10B02C17/18B22F9/04B33Y10/00B22F2999/00B22F2009/041B22F2009/043B22F10/00B22F10/36B22F10/32B22F10/366B22F10/28B22F10/34B22F2201/11Y02P10/25
Inventor 陈祯魏培张树哲杨喜岗卢秉恒张丽娟邹亚桐
Owner NAT INST CORP OF ADDITIVE MFG XIAN
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