| 摘要 |
PURPOSE:To obtain a highly siliceous material for thermal spraying forming a thermally sprayed repaired body which can withstand use over a long period by mixing SiO2 with Al2O3, CaO, Fe2O3 and Na2O in a specified ratio. CONSTITUTION:This highly siliceous material for thermal spraying consists of, by weight, 93.9-99.6% SiO2, <=1.5% Al2O3, <=2.0% CaO, <=1.0% Fe2O3 and 0.4-2% Na2O. The material is a powdery material suitable for the repairing of a kiln, especially a coke oven by flame spraying. The material forms a thermally sprayed body having >=about 60% degree of crystallinity immediately after thermal spraying and the volume is hardly shrunk by transition from the glass phase to the crystal phase, so cracking followed by stripping is not caused. The material gives a thermally sprayed repaired body having a coefft. of thermal expansion nearly equal to that of silica brick, independent of repeated changes of heat and capable of withstanding use for a long period. |
