| 摘要 |
FIELD: equipment for producing fibrous and granular materials for use in chemical, light, building, electronic industries, as well as in medicine. SUBSTANCE: according to present invention, it is recommended to form working portion of die from zirconium-based alloy alloyed with Groups V-VI metals and oxygen. Surface of die and surface of channels formed in it is coated with zirconium dioxide layer modified with zirconium/nitrogen and zirconium/carbon compounds. It is recommended to use, as one of eligible alloys, alloy containing, wt.%: niobium 1-5, oxygen 0.05-0.20, zirconium being balance, as well as to use, as material for said protective coating, compound such as zirconium hydroxycarbonitride. proposed method for manufacturing die has following inventively novel features: workpiece made of zirconium-based alloy alloyed with Groups V-VI metals and oxygen is subjected to heat treatment before forming channels in die. Heat treatment is carried out until complete recrystallization of material of workpiece. Surface defects are removed by pickling workpiece until polished surface of channels and workpiece is obtained. After washing workpiece, its surface and that of channels are reinforced by chemico-thermal treatment in gas phase. Said heat treatment is carried out under reduced pressure 1x<EMI ID=0.117 HE=6 WI=12 TI=CHI> mm Hg at temperature T= 600-750 C for 2-4 h, while said chemico-thermal treatment is carried out in medium formed by potassium cyanides decomposition products, in presence of oxygen and fluorine-containing compounds of Group IV metals in carburization reactor. Die is high corrosion-resistant to attack by aggressive media and has enhanced strength and hardness. EFFECT: prolonged service life; lower production cost as compared to dies made of noble metals. 6 cl, 5 tbl, 3 dwgg
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