| Orobraze 990 is manufactured to the highest quality to meet the needs of the aerospace, thermionic component, nuclear and chemical industries. Its properties and uses are similar to those of Orobraze 950. It exhibits excellent high temperature strength up to 500°C and shows good resistance to oxidation at elevated temperatures. Orobraze 990 also offers good corrosion resistance in many chemical environments. This alloy has been used in the manufacture of aero-engine components for its high temperature properties. Orobraze 990 is suitable for brazing in a vacuum because it contains no volatile elements. Grade 1 Orobraze 990 has impurity levels which make it suitable for brazing components that operate in an ultra high vacuum, such as vacuum tube devices. It is suitable for step brazing in complex assemblies. Orobraze 990 differs from Orobraze 950 in that it has a 40°C melting range and consequently typical joint gaps are 0.075-0.2mm depending on parent metals and joint configuration. Typical applications are for brazing stainless steel, high temperature nickel alloys and super alloys. It can be used for joining copper to these alloys in thermionic valve devices. Orobraze 990 is most often used for brazing in reducing atmosphere or vacuum and under these conditions no flux is used. It can also be used in air with flame or induction heating if a suitable flux is employed. Information provided by Johnson Matthey Metal Joining |
