Present low-pressure carburizing is controlled by computer optimized treatment programs. Up to now no carburizing process in-situ control was possible. This restricts process monitoring and quality control. Insufficient carburizing by non-optimized gassing or too low gas amounts could not be recognized or corrected during the process.
The development of a low-pressure carburizing sensor that determines the degree of reaction of acetylene by measurement of H2 concentration in the furnace hot zone is reported. It is shown that the H2 concentration depends significantly on batch surface area, loading density, treatment temperature and gas flow rate. The developed correlations permit low-pressure carburizing process monitoring as well as process control.
For the first time for low-pressure carburizing an in-situ monitoring of the pyrolysis reaction is possible by the introduction of a low-pressure sensor. This represents substantial progress in quality control of lowpressure processes. Furthermore through H2 measurement results can be controlled from the reaction at the component surface, also carburizing problems can be recognized and/or avoid by process control.
The results of this comprehensive study are presented and the actual state of development discussed.
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Press Release
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| Control of low-pressure carburizing processes |
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