| 摘要 |
PURPOSE:To obtain a stable performance even at high temperatures, by using a brazing material containing Ti, Zr, Hf or the like in addition to Ag-Cu for bonding a ceramics ball to a metal spacer fitted in a groove for inserting a stem of the ceramics ball therein. CONSTITUTION:A ceramics ball 2 is brazed to a stainless steel spacer 7 fitted in a groove 6 for inserting a stem of the ceramics ball 2 therein by using a brazing material 9 containing Ag-Cu-Ti. Thus, by using the brazing material containing the active metals having a superior heat resisting strength for the bonding between the ceramics ball and the spacer, the bonding portion can sufficiently resist a thermal expansion of the ceramics ball 2 and the spacer 7 even when a high-temperature fluid flows. Accordingly, there occurs no cracking in the bonding portion to ensure a long life use.
|
