Process for sintering powder metal parts

Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions

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148 167, 148 203, 148126, B22F 300

Patent

active

041393759

ABSTRACT:
In a process for sintering powder metal parts comprising:
(a) passing the parts through a furnace adapted therefor from its upstream end to its downstream end, said furnace having two successive zones, an upstream zone, which is maintained at a temperature in the range of about 800.degree. F to about 2200.degree. F and a cooling zone, said furnace further having an atmosphere therein comprising carbon monoxide, hydrogen, carbon dioxide, water and nitrogen distributed throughout the zones;
(b) permitting the parts to reside in the upstream zone for a sufficient length of time to cause sintering; and
(c) removing the sintered parts from the furnace, the improvement comprising: introducing a mixture consisting essentially
Of methanol and nitrogen into the upstream zone at a point where a temperature of at least about 1500.degree. F is maintaied, the methanol and nitrogen being in a ratio sufficient to provide, when subjected to such temperature, an atmosphere comprising, in percent by volume, about 1 to about 20 percent carbon monoxide; and about 1 to about 40 percent hydrogen; and balance nitrogen.

REFERENCES:
patent: 2673821 (1954-03-01), Stutzman
patent: 3891473 (1975-06-01), Latua

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