| 摘要 |
PURPOSE:To provide an economical titled ferrule having excellent resistance to heat and thermal impact by adding specific oxide such as Fe2O3 or the like to specifically composed SiO2, Al2O3 and MgO, dispersing adequate pores and subjecting the ferrule to a water repelling treatment using silicone. CONSTITUTION:A ferrule for stud welding is constituted by incorporating at least one kind among 2-4pts.wt. Fe2O3, 2-4pts.wt. MnO and 0.25-1pt.wt. V2O5 in combination to 100pts.wt. the basic compsn. consisting of 40-65wt% SiO2, 25-35% Al2O3 and 10-25% MgO, dispersing <=100mu pores at 10-30% porosity and the ferrule is subjected to a water repelling treatment using silicone. Such ferrule is highly resistant to heat and thermal impact, has the excellent power to remove oxide films from the surface of the stud and base metal and suppresses water absorptivity. Said ferrule is obtd. by mixing and molding the prescribed raw material as well as water, lubricating agent, etc., calcining the molding in an about 1,120-1,160 deg.C range and subjecting the calcined molding to a water repelling treatment by coating a silicone emulsion thereon after cooling. |
