Metallizing of glass machinery and moulds

GT V02 1961 142-145

Metallizing is the process of spraying molten metal on to a surface to form a deposit or 'coating'. Sprayed metal is used in the glass industry to rebuild worn parts, salvage mis-machined ones, or to provide a superior wearing surface. All metals can be treated by the Metallizing process and the range of metals which can be deposited is from molybdenum(melting point 47.50" F) to tin (melting point 450" F). Considerable use has been made of hard surfacing nickel/chrome/boron alloys on moulds and plungers. These alloys are 'fused' at a temperature of 19.50" P after spraying to give a solid deposit, welded to the base metal, with hardnesses from Rockwell 30C to 65 C and very low coefficients of friction. Although such alloys can be applied by welding, spraying is extremely economical where smooth deposits, up to 0.060 in only, are required. Ceramics can also be deposited and use has already been made, in other industries, of' heat and abrasive resistant coatings

J. A. Fawcett
METCO Ltd., Chobham, Woking