Mo-Ti members with non-metallic sintering aids
AssigneeGTE Laboratories Incorporated
InventorsBrian M. Ditchek, Thomas R. Middleton
Life of this patent
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Abstract
Boron, oxygen, or a mixture thereof, is used as a sintering aid in sintering Mo-Ti alloys. Compounds formed between these sintering aids and the Mo or Ti have thermal expansion coefficients consistent with that of alloys of Mo and Ti. An hermetic member may be made using these constituents. The hermetic member may be used to seal an assembly such as a high pressure sodium lamp.
Claims28
A member having an approximately uniform thermal expansion coefficient, said member sintered from a mixture comprised of molybdenum in the form of approximately -325 mesh powder, titanium in the form of approximately -325 mesh powder, and, as a sintering aid, 0.01 to 5 weight percent of oxygen in the form of oxide or boron or mixtures thereof.
A method of manufacturing a member having an approximately uniform thermal expansion coefficient, comprising the steps of:
- providing molybdenum in the form of approximately -325 mesh powder;
- providing titanium in the form of approximately -325 mesh powder;
- providing approximately 0.01 to 5 weight percent of oxygen in the form of oxide, or boron, or a mixture thereof;
- mixing the foregoing components in an inert atmosphere;
- pressing the resulting mixture into a desired shape;
- and
- heating the pressed mixture in an inert atmosphere to a temperature sufficient to sinter said mixture.
A sealed assembly comprised of
- a ceramic tube having two ends;
- at least one member hermetically sealed to one of asid ends, said member a sintered composition of molybdenum in the form of approximately -325 mesh powder, titanium in the form of approximately -325 mesh powder, and approximately 0.01 to 5 weight percent of oxygen in the form of oxide, or boron, or mixtures thereof.
Dependencies are inferred from the claim text.