C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
354/21, 38/32
C21D 11/00 (2006.01) C21D 1/76 (2006.01) C23C 8/06 (2006.01) G01N 33/00 (2006.01) G05D 21/02 (2006.01)
Patent
CA 1143842
ABSTRACT OF THE DISCLOSURE A system is provided for precise monitoring and control of the carbon content of the atmosphere of a furnace such as a carburizer used in the heat- processing of steel parts. According to the system an apparatus is provided which includes a sampling system for withdrawing a gas sample from the atmo- sphere within a furnace and an analyzer for producing signals indicative of the partial pressures of at least two gaseous components such as carbon dioxide and carbon monoxide. The analyzer preferably utilizes selective absorption of narrow-band infrared radiation signals in determining these signals. A proces- sor combines the signals indicative of partial pressures with parameters obtained from measurements of furnace temperature, and calculates carbon potential of the furnace atmosphere. The processor output is coupled with an atmosphere control which maintains desired levels of carbon potential in the atmosphere of the furnace by, for example, regulating the flow of an enriching gas to the furnace.
357836
Fraim Freeman W.
Gupta Bhupendra K.
Shefsiek Paul K.
Holcroft
Smart & Biggar
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