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a wc p /al composite material and preparation method thereof

A composite material and composite powder technology, applied in the field of WCp/Al composite material and its preparation, can solve the problems of complex preparation process, uneven dispersion, easy agglomeration, etc., and achieve the effect of expanding the application field and simple process

Active Publication Date: 2021-06-08
无锡飞而康新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the powder metallurgy method can be mixed in various proportions and avoid the segregation of WC particles in the casting method, the prepared WC p / Al composite material has low density and large porosity, and when the mass fraction of WC particles is high, it is easy to agglomerate and unevenly dispersed, and WC particles cannot effectively cover Al particles (such as figure 1 shown), and the overall preparation process of the material is complex, the shape of the prepared part is simple, and the size is limited

Method used

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  • a wc <sub>p</sub> /al composite material and preparation method thereof
  • a wc <sub>p</sub> /al composite material and preparation method thereof
  • a wc <sub>p</sub> /al composite material and preparation method thereof

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preparation example Construction

[0029] figure 1 Shown is the WC provided by the present invention p A kind of preparation method of / Al composite material, it comprises S1-S3 step:

[0030] S1: Pre-mix WC powder and passivated nano-pure aluminum powder and then mix with AlSi 10 Mix the Mg powder evenly to obtain a composite powder;

[0031] S2: Drying the composite powder;

[0032] S3: molding the dried composite powder through an additive manufacturing process.

[0033] Among them, the addition of passivated nano-pure aluminum powder can improve the wettability of WC and Al during laser sintering, and realize the uniform mixing of high-mass fraction WC and Al. The pinning effect of WC particles can enhance the bonding strength of aluminum matrix particles, thereby improving the mechanical properties of the material. At the same time, in the laser sintering process of additive manufacturing, WC particles can serve as heterogeneous nucleation sites to refine the grains. function, so as to obtain a more u...

Embodiment 1

[0047] This example is to prepare WC with a WC content of 1%. p / Al composite material, the specific steps are as follows:

[0048] Weigh 0.05kgWC powder, 0.0075kg passivated nano-pure aluminum powder and 4.9425kgAlSi powder respectively 10 Mg powder.

[0049] Put the WC powder and the passivated nano-pure aluminum powder into the mixer and mix the powder for 30 minutes at a speed of 300r / min. Then add AlSi to the mixer 10 For Mg powder, mix the powder for 30 minutes at a speed of 500r / min. Finally, the powder was mixed at a speed of 800r / min for 30 minutes, and the powder mixing was completed to obtain a composite powder. Among them, the mixer runs for 10 minutes and stops for 3 minutes to cool down.

[0050] Pour the mixed composite powder into the tray, bake in a vacuum drying oven for 3 hours, take it out and turn it, then put it in the drying oven and dry it for 3 hours, the drying temperature is 100°C, and the moisture content of the composite powder after drying is...

Embodiment 2

[0057] This example is to prepare WC with a WC content of 20% p / Al composite material, the specific steps are as follows:

[0058] Weigh 1kg of WC powder, 0.15kg of passivated nano-pure aluminum powder and 3.85kg of AlSi 10 Mg powder.

[0059] Put the WC powder and the passivated nano-pure aluminum powder into the mixer and mix the powder for 60 minutes at a speed of 200r / min. Then add AlSi to the mixer 10 For Mg powder, mix the powder for 25 minutes at a speed of 600r / min. Finally, the powder was mixed at a speed of 900r / min for 40 minutes, and the powder mixing was completed to obtain a composite powder. Among them, the mixer runs for 15 minutes and stops for 5 minutes to cool down.

[0060] Pour the mixed composite powder into the tray, dry it in a vacuum drying oven for 2 hours, take it out and turn it, then put it into the drying oven and dry it for 4 hours, the drying temperature is 75°C, and the moisture content of the composite powder after drying is less than 0....

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Abstract

The present invention provides a WC p / Al composite material and preparation method thereof. The preparation method comprises the steps of: premixing WC powder and passivation nanometer pure aluminum powder with AlSi powder 10 The Mg powder is mixed uniformly to obtain a composite powder; the composite powder is dried; the dried composite powder is shaped by an additive manufacturing process. The method of the present invention can prepare WC with high WC content p / Al composite material, WC can be uniformly distributed on the interface between Al particles, and the comprehensive mechanical properties of the material are good. Further, the present invention adopts the additive manufacturing method for forming, the process is simple, and composite materials of various shapes and sizes can be prepared, which greatly expands the application field.

Description

technical field [0001] The invention belongs to the technical field of particle-reinforced aluminum-based composite materials, and in particular relates to a WC p / Al composite material and its preparation method. Background technique [0002] Tungsten carbide (WC) has a good absorption and shielding effect on electromagnetic waves due to its high atomic number element W. Al has high thermal conductivity (170-220W / m·k), low density (2.97g / cm -2 ), low price and easy processing. WC p The / Al composite material combines the advantages of the two materials. It has low density, high mechanical properties, and excellent high-energy ray shielding performance. It has advantages in the miniaturization and light weight of shielding materials required by devices. Good application prospects. [0003] The traditional manufacturing methods of particle reinforced aluminum matrix composites are casting method and powder metallurgy method. The casting method is to add WC particles int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C21/02C22C32/00B22F3/105B33Y10/00B33Y80/00
CPCC22C1/05C22C21/02C22C32/0052B33Y10/00B33Y80/00B22F10/00B22F10/362B22F10/34B22F10/36B22F10/28Y02P10/25
Inventor 陈志茹夏承东张小军周德敬
Owner 无锡飞而康新材料科技有限公司