Metallurgical apparatus – With control means responsive to sensed condition – With analyzer or computation means
Patent
1987-08-17
1988-11-01
Rutledge, L. Dewayne
Metallurgical apparatus
With control means responsive to sensed condition
With analyzer or computation means
266 87, 266 89, 432 37, C21D 1100, F27B 940
Patent
active
047813580
ABSTRACT:
An apparatus for measuring and regulating the variable pressure furnace gas chemistry is described. The apparatus uses a mass spectrometer for measurements, in the preferred form of the invention, in which gas species percent composition is obtained quantitatively independent of total furnace pressure variation. Using such a real time measurement capability, active control of batch process furnace operations is possible by intrinsic measurement of the part outgassing rather than by assumption of batch part status as a function of extrinsic parameters such as temperature and total pressure. Thus, by a combination of batch process temperature ramp control and variable admittance of suitable gas into the furnace, uniform batch processing is possible by closed loop control, due to renormalization of furnace residual gas chemistry from day to day drift and from batch part chemistry variation. Quantitative measurements of the variable residual pressure is made possible by adjusting in real time the throughput into the mass spectrometer independent of the total pressure variation in the furnace. These measurement means also make possible the real time determination of sinter part densification in vacuum furnaces by measurement of the part outgassing attenuation during pore closure.
REFERENCES:
patent: 3489518 (1970-01-01), Revell et al.
patent: 3610599 (1971-10-01), Carlson
patent: 4288062 (1981-09-01), Gupta et al.
McDowell Robert L.
Rutledge L. Dewayne
Wylie Paul R.
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