| 摘要 |
PROBLEM TO BE SOLVED: To obtain a tool material for firing, capable of proving a fired product having excellent characteristics preventing the component of the fired product from reacting with a coating material, and capable of enabling a hardly broken material having a low thermal expansion to be used as a substrate by forming a thermal-sprayed and coated layer, obtained by carrying out the thermal spraying of a material obtained by thermal spray, consisting essentially of ZrO2 and CaO, and having a mineral composition of the essential component of calcium zirconate, on the surface of an alumina-based substrate, and having high CaO content. SOLUTION: This tool material for firing is the one having a membrane coated by thermal spray, consisting essentially of ZrO2 and CaO regulated so that the content of the CaO may be 23-30 wt.% based on the total amount of the ZnO2 and CaO, and having an essential mineral composition of calcium zirconate on the surface of an alumina-silica based substrate containing 65-95 wt.% Al2 O3 . The tool material has >=0.3% difference of thermal expansions between the substrate and the membrane coated by the thermal spray at 1,200 deg.C. |
