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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  • Abstract
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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 reinfor

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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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Example Embodiment

[0036] A method for preparing graphene alloy nano composite material includes the following steps:

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

[0038] b. Mix graphene powder and anhydrous ethanol at a volume ratio of 1: (200-2000) to obtain a graphene-anhydrous ethanol suspension. Place the graphene powder in anhydrous ethanol and vibrate ultrasonically for no less than 2 hours. Disperse by sufficient vibration to form a graphene-anhydrous ethanol suspension;

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

Example Embodiment

[0046] Example 1

[0047] (1) Using K418 nickel-based superalloy material as the matrix and 0.1g graphene as the nanocomposite reinforcement, the graphene-reinforced K418 nanocomposite material (GNPs / K418) was prepared. The original K418 powder was a normally distributed particle size of 15-53μm. 的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. figure 2 Shown

[0048] (2) Add 0.1g of graphene powder to absolute ethanol, configure it into a 0.1% suspension of graphene powder mass fraction, and vibrate ultrasonically for 2 hours until the graphene powder is evenly mixed into absolute ethanol; The suspension of g graphene powder and absolute ethanol is poured into 100g of K418 alloy powder, and the composite alloy powder is wet-milled in a ball mill by mechanical alloying for 4 hours, and the ball-to-batte...

Example Embodiment

[0052] Example 2

[0053] (1) Using 100g of K418 nickel-based superalloy material as the matrix and 1g of graphene as the nanocomposite reinforcement to prepare graphene-reinforced K418 nanocomposite materials (GNPs / K418);

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

[0055] (3) Take out the absolute ethanol protection in the mixed slurry A: After standing for 38 hours, dry the mixed powder for 24 hours under vacuum at 105°C, and the vacuum degree is 1×10 -2 Pa; Plasma-assisted ba...

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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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