Method and device for the heat treatment of workpieces
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United States of America Patent
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Nov 3, 1998
Grant Date -
N/A
app pub date -
Apr 15, 1996
filing date -
Jun 3, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention involves a method and a device for the heat treatment of workpieces, which are heated with radiant heat generated through the combustion of gaseous fuel. Some of the workpieces are subjected to a carburisation atmosphere formed by a heated mixture of hydrocarbon containing gas and carbon dioxide, where the carbon dioxide has been separated from the exhaust gas of the gaseous fuel combustion. Other workpieces may be subjected to a nitrocarburisation atmosphere formed by a mixture of ammonia and the exhaust gas remaining after the carbon dioxide has been separated. By recycling some of the products of the combustion process, the present invention improves the efficiency of the carburisation process while reducing pollutant emissions.
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