Niobiam powder, and solid electrolytic capacitor
A technology of solid electrolysis and capacitors, which is applied in the direction of electrolytic capacitors, capacitors, circuits, etc., can solve the problem that the type, amount and specific effects of additives are not given quantitatively.
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Embodiment 1～3、 comparative example 1～2
[0018] Niobium powder is produced by reducing niobium pentachloride with hydrogen. This niobium powder was heated in a hydrogen atmosphere at a temperature of 1100° C. for varying times, and the amount of hydrogen introduced into the niobium powder was adjusted. The amount of hydrogen was measured using a thermal conductivity gas analyzer. Thereafter, capacitors as described above were produced, and the values of leakage current and electrostatic capacity of the capacitors were measured. The results are shown in Table 1. When the hydrogen content is in the range of 1 ppm to 600 ppm, the leakage current is small and the electrostatic capacity is large; the results outside the upper and lower limits are not ideal.
Embodiment 4～5、 comparative example 3～4
[0020] Niobium powder is produced by aluminum reduction of niobium oxide. The amount of naphthalene added to this niobium powder was varied in various ways, heat treatment was performed at a temperature of 1100°C for a predetermined time, and the amount of carbon introduced into the niobium powder was adjusted. The amount of carbon was measured with a combustion infrared absorption analyzer. Thereafter, capacitors as described above were produced, and the values of leakage current and electrostatic capacity of the capacitors were measured. The results are shown in Table 2. When the carbon content is in the range of 1ppm to 200ppm, the leakage current is small and the capacitance is large; if it is less than 1ppm or exceeds 200ppm, the leakage current increases and the capacitance decreases.
Embodiment 6～7、 comparative example 5～6
[0022] Niobium powder is produced by reducing niobium oxide with aluminum. The amount of nickel carbonyl added to this niobium powder was varied in various ways, and heat treatment was performed at a temperature of 1100°C for a predetermined time to adjust the amount of nickel introduced into the niobium powder. The amount of nickel was measured with a plasma excited mass analyzer. Thereafter, capacitors as described above were produced, and the values of leakage current and electrostatic capacity of the capacitors were measured. The results are shown in Table 3. When the nickel content is in the range of 1ppm to 50ppm, the leakage current is small and the electrostatic capacity is large, and the result is good; outside this range, the performance becomes poor.
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