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 Wysłany: Nie 1:58, 16 Sty 2011 Temat postu: ugg boots günstig Powder metallurgy materials is |
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Powder metallurgy materials is targeting a large arms market
The initial efforts are lead-free projectile of tungsten. Recovering material 5.56mm nylon bullet, this bullet was designed at least 2O-year service period,[link widoczny dla zalogowanych], and hope does not change the U.S. military production facilities and the use of the hybrid to replace the case. w, sn, and tungsten. Nylon replace the same result, the estimated annual amount of l8O million pounds of tungsten (800t above), to start making use of the future success of 9mm,[link widoczny dla zalogowanych], 7.62mm and O5 inch diameter bullets. The results show that,[link widoczny dla zalogowanych], W / Sn, W. Nylon no damage to the environment. Plastic owl in the lead-free composite materials tested 556mm 7 bullets in the tungsten. Formula of nylon material, 7 kinds of materials l2 dollars, pounds), should be designed to be easy firing range of the characteristics of recovery are listed in Table l. Table l7 kinds of properties of the materials table, 96% and 4% nylon tungsten (density 0.9g/cm) complex sets the final density of material 1l ~ cm, close to the density of lead. These products can use the conventional thermoplastic injection molding equipment to process preparation, this material can also be made of plate and membrane materials, other applications include: plants in the nuclear industry, medical sector and the transport containers and other isotopes used in radiation screen increasing variety and balance on the flywheel device, the balance of the aircraft on the hammer,[link widoczny dla zalogowanych], golf club head with weights. W / Sn also can be used for the same application. l0 Metal Bulletin 2802 No. 2 U.S. military research labs piercing tungsten-based material instead of trying to use controversial depleted uranium. Conventional wi penetrators have a big mushroom-shaped punch, limiting the ability to reverse its armor-piercing depleted uranium is no such insulation body, warhead small size, which has the potential to depleted uranium have a \piercing can be a great impetus to it, the general depth of depleted uranium armor-piercing tungsten penetrators more than 2 times. To replace depleted uranium must be high density, and selection of insulation can be applied to the mechanism of free base alloy instead of nickel. Injuries such Taijin broom known high strength steel, titanium, zirconium and hafnium Taijin, zirconium and hafnium in which heavy, may be added to the large proportion of tungsten Taijin while maintaining the same final density. Production methods are: the W and Hf (or Zr) powder mixed jacketed, vacuum, seal welding, and hot static pressing. The best performance of these materials is 8w Tuo 0Hf Taijin, but the armor-piercing depleted uranium penetrating power compared with the storm still stalks mandarin duck. However, the tungsten-based penetrators are continuing the development work, such as maternal sensitivity using other insulation alloys, including nano-crystalline and amorphous materials testing is under way. Has been tested in the sintered tungsten-based materials in three ways: First, the fine grain of the spherical tungsten powder made: two by the Reaction Spray Process (RSP) Preparation of powder made of pre-sets; third tungsten coating system by Recovering material into the fiber. After all three materials vary in the 50% sinter, which is depleted uranium the military called for the retention of the original should be subject to rotary forging. Material properties are listed in Table 2. Table 2 for high-speed penetration test the mechanical properties of the rod with a 3mm × 4mm tungsten armor-piercing bomb tests carried out, targets for low carbon steel,[link widoczny dla zalogowanych], test speed was 650m / s and I350m / s at low speed, target and the projectile material is a typical plastic deformation, at high speed, crossing the plastic compression and expansion through the projectile and target, both the surface melts about Imm deep. Test showed that the contact in the target and the projectile had a phase transition zone and the aggregation state of change: in the high-speed impact, the viscous flow caused by the decline in penetration bombs and length decreases; cut the promotion of particles into the liquid phase projectile penetration: penetration by the flow of institutional control has nothing to do with the inelastic response; elastic / plastic material through the dynamic performance only in the later stage of work; with a spherical microstructure of the tungsten grain size is conducive to penetrate Taijin and no insulation bodies can increase the penetration depth of tungsten shells. 【International Liao Chang) Analysis of titanium present, by the fear of falling incident, the U.S. aircraft utilization rate of decline in the total costs, resulting in shock by the amount of airline distribution, the United States crossing the sound of large passenger aircraft company in Europe ordering extension. Boeing is reducing the production of large passenger aircraft Boeing plans to lay off 30,000 people will be the end of 2002, therefore, the B777 series is being produced by aviation aircraft delivery number from the end of the end of 2001 to 2002 year by 25% (2001 The number of 522 aircraft deliveries). Latest 200LR passenger aircraft at the same time (with a capacity for 300 persons) the development of manufacturing has been frozen from 2006 -2008 in the original plan to commercialize the voice of boats will also be postponed; originally planned 2003 production of aviation 400 450, the current estimated to be reduced to 300 -350 aircraft: A380 scheduled to fly in early 2002, production of rare metals Letters 11, 2002, 2 weak
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