Method for forming complex NiTi alloy component through additive manufacturing

A technology of additive manufacturing and complex structures, which is applied in the direction of additive manufacturing, additive processing, and improvement of process efficiency, etc., to achieve the effects of short manufacturing cycle, good interlayer bonding, and high precision

Inactive Publication Date: 2018-08-14
JILIN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of traditional methods for preparing complex NiTi alloy components, and provide a method for forming complex NiTi alloy components through selective laser melting technology (SLM), which can form various curved surfaces

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  • Method for forming complex NiTi alloy component through additive manufacturing

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Embodiment

[0020] Embodiment: the embodiment of the present invention comprises the following steps:

[0021] The Ni, Ti, and Nb element powders are based on the ratio of the atomic ratio Ni:Ti:Nb=50.6:47.4:2, and the NiTi alloy powder is prepared by a gas atomization method. Nickel with a purity of 99.99%, titanium with a purity of 99.9%, and niobium with a purity of 99.8% are degreased, cleaned, and dried, and put into a crucible according to the proportion, and heated and smelted in an electric furnace under the protection of argon. When the metal is impacted by the high-speed and high-pressure argon gas in the atomization tower to the liquid flow through the nozzle, it will be hit into mist droplets, and the droplets will cool and solidify into NiTi metal powder during the falling process, with a particle size of 0.020-0.040mm. Dry the powder in a drying oven at 160°C for 1 to 1.5 hours, then set aside;

[0022] Install a metal substrate at the bottom of the forming cavity to provid...

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Abstract

The invention discloses a method for forming a complex NiTi alloy component through additive manufacturing. According to the method, a metal base plate is installed at the bottom of a forming chamber,the forming chamber is filled with high-purity argon beforehand to make the oxygen content in the forming chamber smaller than 60 microliter per liter, a selective laser melting technology is utilized to form the complex NiTi alloy component, layer-by-layer laser cladding is realized through the numerical control program of each layer to finally obtain a three-dimensional metal part, and the problem that the complex NiTi alloy component with good mechanical property cannot be made with a common smelting method or a powder metallurgy method in the prior art is solved. With the method for forming a complex NiTi alloy component through additive manufacturing, the various complex NiTi alloy components with cambered surfaces, complex inner chambers and the like are quickly formed without any special molds or any special tools, and the made components are good in interlayer combination, simple in technology, and short in manufacturing period, and has the characteristics of being high in density, accuracy, metal powder utilization rate and the like.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, in particular to a method for forming complex NiTi alloy components by additive manufacturing. Background technique [0002] Laser Additive Manufacturing (Laser Additive Manufacturing, LAM) technology, also known as laser 3D printing technology, is an additive manufacturing technology that uses lasers as energy sources. Lasers have the characteristics of high energy density and can realize the manufacture of difficult-to-machine metals, such as Titanium alloys, high-temperature alloys, etc. used in the aerospace field. At the same time, laser additive manufacturing technology can also overcome the large waste of raw materials caused by traditional subtractive manufacturing. It has rapid prototyping, fine grain, uniform and defect-free structure, and high structural strength. With many excellent features, it is not limited by the structure of the part, and can be used for the ...

Claims

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Application Information

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IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/66B22F10/322B22F10/28B22F10/36B22F10/366Y02P10/25
Inventor 张志辉祖硕林鹏宇梁云虹刘庆萍于征磊王熙张清泉任露泉
Owner JILIN UNIV
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