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US 6,663,982 B1Granted
Silver-hafnium braze alloy
AssigneeSandia Corporation
InventorsJohn J. Stephens, Jr., F. Michael Hosking, Frederick G. Yost
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AssigneeSandia Corporation
InventorsJohn J. Stephens, Jr., F. Michael Hosking, Frederick G. Yost
Estimating the term…
A binary allow braze composition has been prepared and used in a bonded article of ceramic-ceramic and ceramic-metal materials. The braze composition comprises greater than approximately 95 wt % silver, greater than approximately 2 wt % hafnium and less than approximately 4.1 wt % hafnium, and less than approximately 0.2 wt % trace elements. The binary braze alloy is used to join a ceramic material to another ceramic material or a ceramic material, such as alumina, quartz, aluminum nitride, silicon nitride, silicon carbide, and mullite, to a metal material, such as iron-based metals, cobalt-based metals, nickel-based metals, molybdenum-based metals, tungsten-based metals, niobium-based metals, and tantalum-based metals. A hermetic bonded article is obtained with a strength greater than 10,000 psi.
A bonded article comprising a first material, selected from a first ceramic material and a metal material, bonded to a second ceramic material by a layer of brazing material, said brazing material having a composition comprising greater than approximately 95 wt % silver, greater than approximately 2 wt % hafnium, less than approximately 4.1wt % hafnium, and less than approximately 0.2 wt % trace elements, said metal selected from the group consisting of iron-based metals, cobalt-based metals, nickel-based metals, molybdenum-based metals, tungsten-based metals, niobium-based metals, and tantalum-based metals.
Dependencies are inferred from the claim text.