EFFECT OF PROTECTIVE COATINGS ON THE STRENGTH PROPERTIES OF CAST STEELS,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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Prolonged operation of the turbine rotor of a supercharged diesel normally results in a decrease in the strength characteristics of its material and premature fracture of its blades. Hence, the application of high-temperature coatings to the turbine rotor should be an effective method of enhancing the reliability and life of the turbocompressor. Thus, the effect of coatings of this kind on the strength characteristics of cast steels EI572L austenitic and EI415 pearlitic, used as the materials for integrally cast turbocompressor rotors, was investigated. The following coatings were tested a 1M metalloid coating 20 wt. percent Cr, 70 wt. percent Ni, 5 wt. percent B, 5 wt. percent Si b SM-418 glass-metal coatings representing a combination 1 to 1 weight ratio of A-418 barium silicate glass with a mixture of fine disperse powders of Cr, Ni, B and Si of the aforementioned composition c a Ni-P coating deposited by the chemical nickel plating method from an acid solution. The metalloid and glass-metal coatings were applied by the enameling method in the form of slip applied to the cleaned surface of steel specimens which then were dried and fired at 1040-1100 degrees C for 1M and 1200-1260 degrees C for SM-418. Their thickness ranged from 200 to 300 Mu.
- Coatings, Colorants and Finishes
- Hydraulic and Pneumatic Equipment