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研究了成形压力、钨粉粒度、硬脂酸含量、多孔钨厚度以及少量镍粉对多孔钨性能的影响。实验结果指出,降低单位成形压力,增大钨粉粒度及硬脂酸含量,减少多孔钨的厚度,都能增大多孔钨的孔径,提高相对透气系数。加0.3%(重量)镍不仅能提高多孔钨的烧结性,降低烧结温度,同时使多孔钨的孔径、相对透气系数和强度也有相应的提高。用>50微米非球形钨粉和+150目球形钨粉加2—3%(重量)的硬脂酸作成形造孔剂,加1%(重量)镍粉作活化烧结剂,用粉末冶金的方法制备了W—1(用非球形钨粉)和RW—1(用球形钨粉)两种新型的多孔钨材料供净化高温燃气用。静态点火实验证明,两种型号的多孔钨,能够净化温度为1050℃、压力为110公斤/厘米~2的高温燃气。多孔钨在使用时,没有出现掉粒、烧穿及堵塞现象,获得了满意的净化效果。
The effects of forming pressure, tungsten powder size, stearic acid content, porous tungsten thickness, and a small amount of nickel powder on the properties of porous tungsten were investigated. Experimental results show that reducing the unit forming pressure, increasing the tungsten powder size and stearic acid content, reducing the thickness of porous tungsten can increase the porous tungsten pore size and improve the relative permeability coefficient. Addition of 0.3% by weight of nickel not only improves the sinterability of the porous tungsten, but also reduces the sintering temperature, and at the same time increases the pore size, the relative air permeability coefficient and the strength of the porous tungsten. With> 50 micron non-spherical tungsten powder and +150 mesh spherical tungsten powder plus 2-3% by weight of stearic acid as a pore forming agent, plus 1% by weight of nickel powder for activation sintering agent, powder metallurgy Methods Two new types of porous tungsten materials, W-1 (non-spherical tungsten powder) and RW-1 (spherical tungsten powder), were prepared for the purification of high-temperature gas. Static ignition experiments show that two types of porous tungsten, can purify the temperature of 1050 ℃, the pressure of 110 kg / cm ~ 2 high temperature gas. Porous tungsten in use, did not appear out of grain, burn through and clogging phenomenon, access to a satisfactory purification effect.