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| Tungsten Copper |
By comparison, tungsten
copper W-Cu system combines high hardness, high density, high strength and
excellent chemical properties of W and excellent thermal conductivity of and
plasticity of Cu. Since there is a big difference between W and Cu (W-3410℃，Cu-1083℃), After the explosion
of copper is evaporated leaving a high hardness, high density hard phase
tungsten, compared to copper Liner armor penetration depth can be increased by
nearly 30%. Therefore, tungsten copper EFP liner has a broad application
prospect in the future. Ordinary tungsten powder, copper powder and ultra-fine
tungsten-copper composite powder prepared tungsten copper EFP Liner and its
performance was compared. Wherein ultrafine tungsten copper composite powder is
prepared by using spray pyrolysis, it uses a proportion of copper nitrate andammonium metatungstate dissolved in distilled water into the mixed solution,
and then the pressure centrifugal spray drier precursor powders, the precursor
powder is then placed in roasting reduction furnace. Finally, wet ground and
placed in a ball mill reduction in the reduction furnace, ultra-fine
tungsten-copper composite powder particle size is formed between 100-300nm.
After
the tungsten copper rod made of tungsten copper EFP started liner blank
forging, which blank deformation has three steps: 1. upsetting the blank in the
mold, in this process the blank upper and lower parts deformation occurs first,
and upper and lower portions of the pores gradually become less under the
influence of compressive stress, density increases, increasing the contact area
with the punch, friction force increases, under the action of the metal tensile
stress generated lateral flow; 2. metal flows hindered by the mold wall and it
will flow along with the hole of the mold bottom, and in the process the pores
reduces and the density increases; finally, when the metal flow to the ejector
rod will enter the multi-pressure stage, mainly through its hydrostatic
pressure to eliminate rough pores, so the effect is not significant.
In
addition, in the process of tungsten copper EFP liner blank forging, there are
two ways of deformation of the matrix material, one is only copper phase
deformation, deformation does not occur with tungsten and tungsten particles
along the direction of deformed copper matrix flow was streamlined
distribution; the other one is both of Cu and W phase have deformation and form
fibrous structure. In order to ensure that the final density, tensile strength
and elongation to achieve the desired requirements, we should make a reasonable
design for tungsten copper EFP liner shape and have sufficient deformation.
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Tel:86-592-512-9696 Fax:86-592-512-9797 Email:sales@chinatungsten.com
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