| 摘要 |
<p>In continuous annealing furnaces for ceramic materials, particularly for low-retentivity ferrite, the oxygen content of the furnace atmosphere is to be set exactly to very low, predetermined values. With some materials to be annealed this gives rise to difficulties, since the materials themselves release oxygen to the furnace atmosphere. To overcome the difficulty, the O2 content of the furnace atmosphere is to be measured at the place in the furnace to be affected, and in dependence on the measurement result a preferably hydrogen-containing fuel gas is introduced into the furnace in quantities such that the desired oxygen content is established. The fuel gas may be, among others, illuminating gas, natural gas or methane. A furnace design suitable for practice of the process is furthermore described. The furnace is divided into chambers, each of which contains, in the regions where the oxygen content is to be reduced, an oxygen measurement probe and at least one nozzle for introduction of the reducing gas.</p> |
