| 摘要 |
The optical identifiability of the state of wear in a gas-fluxing stone of refractory ceramic material, is improved. The identifiability is intended to be independent of the material of the gas-fluxing stone. To this end, a gas-permeable separator space 3, which has different geometric forms in the direction of wear, extends in the gas-fluxing stone. As a result, during throughflow of gas through the separator space 3, a pattern which differs according to the state of wear is visible on the surface of the gas-fluxing stone.
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