Metal treatment – Process of modifying or maintaining internal physical... – With measuring – testing – or sensing
Patent
1991-12-31
1993-11-16
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
With measuring, testing, or sensing
148628, 148634, C21D 176
Patent
active
052619761
ABSTRACT:
A control arrangement is disclosed for a conventional, atmosphere heat treating furnace which is operated at high temperature and fitted with a vacuum pump to draw rough or soft vacuum levels when heating the work to heat treat temperatures. The control arrangement utilizes a hydrogen--inert gas furnace atmosphere continuously metered into the furnace to produce a reducing gas mixture to prevent oxidation of the work. If oxidation conditions are sensed, the mass flow is automatically increased while vacuum levels are maintained constant. A unique oxygen probe mounting arrangement is disclosed which enables a conventional oxygen probe to give fairly accurate and consistent readings for fast, automatic process control.
REFERENCES:
patent: 4565561 (1986-01-01), Gagne
patent: 4606807 (1986-08-01), Mendenhall
Metals Handbook, 9th Edition, vol. 4 Heat Treating; pp. 307-309, 312;365-366.
Metallurgia and Metal Forming, Dec., 1972-Jan. 1973; "Control of Carburizing Furnace Atmospheres Using Oxygen Potential Measurements", pp. 413-416; 19-23.
Chart, "Standard Free Energy of Formation of Oxides as a Function of Temperature" From F. D. Richardson & J. H. E. Jeffies, J. Iron Steel Inst., 160, 261 (1948).
GRI Report #88/0159 titled "High Temperature Indirect-Fired Furnace Development-Phase I, Final Report Nov., 1986-Apr. 1988" Dated Oct. 7, 1988: Excerpts, pp. i, ii, 1-3, 5, 9, 16-19, 26-29, 38, 52-55, 67, 68; APP 2: 2-10; 2-31-34; 3-1-9.
Gas Research Institute
Nawalanic Frank J.
Wyszomierski George
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