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研究了粗钨粉加硝酸镍、硝酸铁溶液,经热处理制取W-Ni-Fe包覆粉末及用它制取多孔W-Ni-Fe的工艺。比较了由W粉加Ni和Fe粉、W粉加硝酸镍和硝酸铁溶液及W粉加Ni、Fe的硝酸盐溶液再经热处理而制取W-Ni-Fe的包覆粉末方法对所制多孔W-Ni-Fe的性能的影响。实验结果指出,由W-Ni-Fe包覆粉末所制多孔W-Ni-Fe的抗弯强度最高。用这种方法制含98.5%W、1.05%Ni和0.45%Fe多孔钨的抗弯强度高达21公斤/毫米~2,平均抗弯强度达到14.8公斤/毫米~2。这种多孔W-Ni-Fe成功地用于净化1250℃和79公斤/厘米~2的高温高压燃气。用包覆粉末比用团粒制多孔W-Ni-Fe,制造工艺要精简一半,制造成本大幅度降低。
The process of preparing crude W-Ni-Fe coated powder with W-Ni-Fe powder by adding nickel nitrate and ferric nitrate solution by heat treatment was studied. The W-Ni-Fe coated powders were compared by W powder with Ni and Fe powder, W powder with nickel nitrate and ferric nitrate solution and W powder with Ni, Fe nitrate solution and then heat-treated Effect of porous W-Ni-Fe properties. The experimental results show that the flexural strength of porous W-Ni-Fe made from W-Ni-Fe coated powder is the highest. The flexural strength of 98.5% W, 1.05% Ni and 0.45% Fe porous tungsten by this method was as high as 21 kg / mm ~ 2 and the average flexural strength was 14.8 kg / mm ~ 2. This porous W-Ni-Fe was successfully used to purify high-temperature and high-pressure gas at 1250 ° C and 79 kg / cm 2. The use of coated powder than with the pellet porous W-Ni-Fe, the manufacturing process to be streamlined by half, significantly reducing manufacturing costs.