Powder metallurgy processes – Powder metallurgy processes with heating or sintering
Patent
1986-01-30
1988-01-12
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
73 26, 73 27R, 264 56, 264125, 264 65, 266 44, 266 79, 266 80, 419 60, C22C 104
Patent
active
047190736
ABSTRACT:
A process and apparatus for measuring and regulating the variable pressure furnace gas chemistry is described. The method makes use of mass spectrometer 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 indpendent 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: 4288062 (1981-09-01), Gupta et al.
patent: 4410632 (1983-10-01), Dilley et al.
patent: 4509727 (1985-04-01), Davis et al.
patent: 4541988 (1985-09-01), Tozier et al.
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