Method of making refiner plate bars

Metal fusion bonding – Process – Diffusion type

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Details

419 9, 419 40, G23R 2000

Patent

active

051655926

ABSTRACT:
The present invention is a method of molding the cutter bars for refiner plates used in treating pulp slurry in the paper processing industry including impressing in a mold the form of a refiner plate or refiner plate segment, pouring the base plate or pouring the base of the refiner base plate segment. The sand surfaces in the mold which will be in contact with the metal to form the perpendicular surfaces of the cutter bars relative to the refiner plate are then treated with a slurry consisting of an alcohol or water carrier into which powdered brittle metal alloys have been introduced such as titanium, boron, carbon, vanadium, chromium, niobium, tungsten, molybdenum and cobalt 10 microns or less in size in the pure or ferro alloy state. The powdered metal alloy slurry is then dried in one of a number of acceptable ways and the cutter bar base metal is then superheated to a temperature higher than its melting point, after which the molten metal is poured into the mold. The superheating and the cooling of the mold diffuse the powdered metal alloys evenly into the cutter bar base metal that touches the treated sand surfaces, the carrier evaporates. After appropriate cooling time, usually 4 to 8 hours, the molded refiner plate or plate segment may be heat treated to further insure deep and even penetration of the powdered metal alloy and the parallel surfaces of the cutter bar to the refiner plate may be machined to form a perfect right angle edge.

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