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Method for preparing tungsten alloy nanomaterials by hot extrusion of cruciform equal channel die cavity

A nanomaterial, cross-shaped technology, applied in the directions of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effect of reducing labor intensity and widening the bending deformation of channels such as

Active Publication Date: 2015-09-30
福建省诺希科技园发展有限公司
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Problems solved by technology

However, the texture of the material obtained by the above method is streamlined, and the grains after refinement are directional, and are small-angle grain boundaries

Method used

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  • Method for preparing tungsten alloy nanomaterials by hot extrusion of cruciform equal channel die cavity
  • Method for preparing tungsten alloy nanomaterials by hot extrusion of cruciform equal channel die cavity
  • Method for preparing tungsten alloy nanomaterials by hot extrusion of cruciform equal channel die cavity

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Embodiment Construction

[0019] figure 1 It is a brief illustration of the processing technology of the present invention. 1. Firstly, the cutting and preparation of the tungsten alloy extrusion billet is carried out; 2. The material softening annealing, shot blasting surface treatment process and water washing process; 3. The hot extrusion process is through the cross-shaped mold cavity. Equal channel angle hot extrusion, hot extrusion of difficult-to-deform tungsten alloys, and the repeated plastic deformation of tungsten alloy materials can be realized by continuously rotating the cross-shaped mold. The lubricants used in the extrusion process are molybdenum disulfide and paraffin wax mixture, the mixing ratio is 2:1.

[0020] figure 2 It is a schematic diagram of hot extrusion of cross-shaped mold cavity and other channel angles of the present invention: 1. Initial state: put the processed tungsten alloy billet into the cross-shaped mold cavity; 2. Extrude once: the punch goes down, when the pun...

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Abstract

The invention discloses a hot-extrusion method for preparing a tungsten alloy nano material by using a channel mould cavity in a cross shape or the like. The method is characterized in that: big plastic deformation is performed on a tungsten alloy which is hard to deform, a cross shaped mould is driven to rotate continuously at the same time so as to achieve the repeated plastic deformation of the tungsten alloy, meanwhile the rotation direction of the cross shaped mould can be changed so as to achieve the uniform deformation of the severe plastic deformation of the tungsten alloy, and finally the method obtains equiaxial grains which have the advantages of large deformation cumulant, uniform crystal grain size, and large grain boundary angle of refined nano crystal particles; thus the mechanical property of a block nano tungsten alloy is further improved, and the alloy has high strength and good toughness on the basis of high intensity.

Description

technical field [0001] The invention relates to a new method and a mold for preparing bulk tungsten alloy nanomaterials, in particular to a continuous extrusion mold with an equal-channel bending process for a cross-shaped mold cavity channel. Background technique [0002] Tungsten is a steel-gray or silver-white metal element with high hardness and high melting point. It is mainly used for manufacturing filaments, high-speed cutting alloy steel, and superhard molds. Tungsten alloy is a kind of alloy based on tungsten (the mass fraction of tungsten is usually 80%-97%), and added with elements such as Ni, F, Mn, Co, Cu, Mo, Cr, etc., and its density is as high as 16.5-19.0 g / ㎝3. At the same time, tungsten metal is often used for military purposes such as armor piercing. At present, tungsten metal has been used in military armor-piercing projectile cores, rocket nozzles, armor-piercing projectile contacts, heating elements and heat shields, etc. It is also used or tried on ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18B82Y40/00B82Y30/00
Inventor 徐淑波李振东马海龙景财年任国成
Owner 福建省诺希科技园发展有限公司
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