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以两种不同纯度的钽粉为原料,配六种不同类型的钽丝为引线,压制成形并以五种温度分别进行烧结,然后,测其电容量、漏电流、孔隙度以及引线的抗脆能力、硬度并取其金相组织。由数据可知,随烧结温度提高,电容量降低,漏电流减少。当烧结温度超过1800℃时,漏电流降低至×10~(-4)μA/μF·V;当超过1900℃时,电容量和孔隙度都趋于稳定,但烧结温度提高,引线的抗脆能力变差,并在1900℃时不合格的几率最大。这证明,烧结温度对材料的电性与抗脆性有明显的影响。由数据可知,以掺杂钽丝作引线的坯块,其电性符合要求,抗脆性也得到改善。掺杂钽丝和钠还原钽粉制的纯钽丝,其抗脆性优于碳还原钽粉制的纯钽丝和以熔炼锭坯制的纯钽丝,由金相照片可见,易脆引线的晶粒粗大且晶界平直,而抗脆好的引线,其晶粒细小井呈细条状或纤维状。由硬度可知,坯块中的气体杂质向引线渗透。
Tantalum powder with two different purity as raw material, with six different types of tantalum wire for the lead, press forming and sintering at five different temperatures, and then measured its capacitance, leakage current, porosity and lead crisp Ability, hardness and take its microstructure. As can be seen from the data, as the sintering temperature increases, the capacitance decreases and the leakage current decreases. When the sintering temperature exceeds 1800 ℃, the leakage current is reduced to × 10 -4 μA / μF · V. When the sintering temperature exceeds 1900 ℃, both the capacitance and the porosity tend to be stable, but the sintering temperature increases. The ability to deteriorate, and at 1900 ℃, the greatest probability of failure. This proves that the sintering temperature has a significant effect on the electrical and brittleness of the material. As can be seen from the data, doping with tantalum wire for the lead of the billet, its electrical properties meet the requirements, anti-brittleness has also been improved. Pure tantalum wire doped with tantalum wire and sodium reduced tantalum powder has better anti-brittleness than pure tantalum wire made from carbon-reduced tantalum powder and pure tantalum wire made from fused ingot. It can be seen from the metallographic pictures that the brittle lead The grain is coarse and the grain boundary is straight, while the lead with good resistance to embrittlement has thin strips or fibers in the fine grain. It can be seen from the hardness that gas impurities in the compact penetrate into the lead.