FIELD: preparation of powder of nitrated valve metal used in electrical engineering.
SUBSTANCE: method comprises steps of nitrating powder of valve metal at sufficient temperature and pressure before step of sintering and heat treatment power of valve metal or after such step but before step of deoxidizing. According to invention nitration is started at mean temperature of valve metal in range 200-350єC. Nitrated powder of valve metal according to invention contains 1500 - 4000 ppm of nitrogen. Such powder provides capacitance in range 40000 - 80000 mcFV/g at making from it anode of capacitor at 30 V. Nitrated valve metal has pore size at least 2 micrometers and it has filling rate 70 - 300 mg/s and Scott density approximately in range 1.526 - 2.441 g/cm3. After sintering powder has uniform distribution of nitrogen at variation in range 100-1500ppm.
EFFECT: possibility for providing uniform distribution of nitrogen in nitrated valve metal.
35 cl, 4 dwg, 9 tbl, 6 ex
