PRODUCTION OF CORROSION-AND WEAR-RESISTANT COATING MATERIAL

摘要

PURPOSE:To obtain a material excellent as a corrosion- and wear-resistant coating material for a member for high-temp. service by producing a thin composite sheet with a heat resistant brazing filler metal by a quick cooling and a solidifying method while adding short ceramic fiber to the down flow melt, etc. of a corrosion- and wear- resistant Co alloy. CONSTITUTION:The brazing filler metal 2 melted in a crucible 1 is continuously dropped or injected onto one roll 3 out of two rolls 3. the corrosion- and wear-resistant Co alloy (e.g.; stellite alloy) 12 melted in the other crucible 11 is further dropped or injected to the spacing between a pair of the roll 3. The short ceramic fibers are at the same instant supplied by a gaseous pressure into the molten Co alloy pool in the spacing between a pair of the rolls 3 from a supply cylinder 4 for said fibers. The molten alloy is quickly cooled by the rolls 3 immediately thereafter by which a thin sheet 5 is obtd. The sheet 5 is adhered and fixed via the brazing filler metal layer 7 to the required point of the member for high-temp. service and is then joined by brazing in a vacuum or reducing atmosphere, by which the intended corrosion- and wear-resistant coating material 15 is obtd. In the figure, 6 denotes the corrosion- resistant Co alloys dispersed with the short ceramic fibers.