| 摘要 |
PROBLEM TO BE SOLVED: To provide a powdered composition that does not eliminate elements for forming pores, and that secures a high silica content and high heat resistance in the fireproof agglomerate to be obtained later.SOLUTION: A powdered composition including porous silica for ceramic welding by spraying is provided, the composition comprising: 10 to 90% of a phase of porous siliceous particles comprising at least 80% by weight of cristobalite and at most 15% by weight of tridymite and residual amorphous phase relative to the total weight of the composition; and 90 to 10% by weight of conventional additives forming a binder phase relative to the total weight of the composition, the porous siliceous particles having a dof between 200 and 1000 μm, and preferably between 350 and 800 μm. |
