| Pallabraze™ 810 is a palladium-silver-copper brazing filler metal. Its primary area of application is in the fabrication of vacuum tube / thermionic valve type devices. Pallabraze™ 810 is therefore normally supplied to ‘Vacuum Grade’ V1, which indicates that the filler metal is supplied to a tightly controlled volatile impurity specification, of the relevant standard. It is commonly used for the brazing of metallized alumina ceramics to controlled expansion nickel, iron, cobalt alloys, where it reduces the chances of intergranular penetration / liquid metal stress cracking occurring on un-plated, controlled expansion alloys. Pallabraze™ 810 can also be used to produce joints for moderately high (300 to 400°C) elevated temperature service conditions where it exhibits good oxidation resistance coupled with good elevated-temperature mechanical properties. It will produce joints on stainless steel that are resistant to interfacial corrosion and offers a good color match particularly with the austenitic grades. It will also offer good levels of corrosion resistance in many other environments with other parent materials. Typical applications are for brazing the internal structures of vacuum tube / thermionic valve devices, in particular the brazing of metalized alumina ceramics to nickel, iron cobalt alloys. It can be used to braze a wide range of parent materials, however, when used for furnace brazing (vacuum or reducing atmosphere) of stainless steels and other similar materials the nickel plating of the parent material will be required. Information provided by Johnson Matthey Metal Joining |
