Loading patent…
OwnerNjall Stefansson, Mark E. Springgate +5inventors
InventorsNjall Stefansson, Mark E. Springgate, James R. Barrett, David Howard Sturgis, James E. Ault, Patrick J. Durbin, Douglas Gene Nikolas
Estimating the term…
A molten metal or molten metal alloy is filtered to remove contaminants. Filters may include imaging agents, especially those useful for N-ray radiography, X-ray analysis, and neutron activation. Currently preferred imaging agents include gadolinia and tungsten. Currently preferred refractory materials include yttria, zirconia, tantalum, tungsten and rhenium. A homogeneous distribution of refractory and imaging materials may be accomplished by vacuum impregnation, chemical vapor deposition, physical vapor deposition, chemical vapor infiltration, fusing, cocalcining, alloying, and physical mixing. Filters substantially resistant to chemical and mechanical degradation may be used. For example, filters may be constructed with at least an outer layer of the filter comprising yttria. Filters may define a porosity and mesh size for efficient filtration and to exclude the maximum allowed size of defects for the particular application. Castings may be analyzed for inclusions by X-ray analysis, neutron activation, and N-ray radiography. Preferred methods for filtering melts include providing a filter including an imaging agent and filtering the melt into a mold to cast a metal article. Filtration may include heating the filter during filtration. The melt may include any molten metal or metal alloy, particularly aluminum, steel, alloys of titanium, chromium, nickel, cobalt and alloys thereof.
A filter for filtering a molten metal or molten metal alloy, comprising an N-ray imaging agent other than borate or titanium boride.
A filter for filtering a molten metal or molten metal alloy, comprising a refractory material and an N-ray imaging agent.
A filter for filtering a molten metal or molten metal alloy, comprising a refractory material and an imaging agent selected from the group consisting of dysprosium, erbium, europium, gadolinium, holmium, iridium, lutetium, neodymium, osmium, praseodymium, rhenium, samarium, tantalum, tungsten, ytterbium, isotopes thereof, physical mixtures thereof and chemical mixtures thereof.
A method for filtering molten metals or molten metal alloys, comprising:
A method for filtering molten metals, comprising:
A method for filtering molten metals, comprising:
A method for filtering molten metals, comprising:
A method for filtering molten metals, comprising:
A method for making a filter for filtering molten metals, comprising:
A method for making a filter for filtering molten metals, comprising:
A method for making a filter for filtering molten metals, comprising:
A system for filtering and casting molten metals, comprising:
A system for filtering and casting molten metals, comprising:
A system for filtering and casting molten metals, comprising:
A filter for filtering a molten metal or molten metal alloy, comprising a refractory material with at least an outer layer that includes yttria.
A metal alloy comprising titanium and an N-ray imaging agent selected from the group consisting of gadolinium, samarium, europium, and mixtures thereof.
A method for filtering a first metal or metal alloy comprising a solid fraction that includes an imaging agent, comprising:
Dependencies are inferred from the claim text.