METHOD AND SYSTEM FOR CONTROLLING ATMOSPHERE IN HEAT TREATMENT FURNACE

摘要

PROBLEM TO BE SOLVED: To resolve a drawback that carburizing time is long and oxidation in grain boundary is increased in a method and a system for controlling the atmosphere in the conventional heat treatment furnace. SOLUTION: In the method and the system for controlling the atmosphere in the heat treatment furnace in this invention, the carburization is performed while supplying hydrocarbon-base gas and oxidizing gas into the furnace and the partial pressure of residual CH4, the oxidizing gas and CO in the furnace are measured, and the supplying amount in each gas is controlled according to either value among these measured values. COPYRIGHT: (C)2003,JPO