Process for forming alloys in situ in absence of liquid-phase sintering
AssigneeThe United States of America as represented by the Secretary of Commerce
InventorsDavid S. Lashmore, John A. Tesk, Moshe P. Dariel, Edward Escalante
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Abstract
Oxide-free metallic, alloy or intermetallic compound formed by coating a powder of at least one member selected from the group consisting of elemental metallic, alloy and intermetallic compound with an oxide-replacing metal. The oxide-free compound may be compacted without the addition of a liquid sintering agent and at temperatures below the melting point of the compound, under sufficient pressure to form a uniform, consolidated intermetallic body.
Claims16
A process for preparing an intermetallic alloy body comprising the steps of:
- a) coating a first powder of at least one member selected from the group consisting of elemental metallic, alloy and intermetallic compounds with an oxide-replacing metal;
- and
- b) compacting the coated first powder or a mixture of an elemental metallic second powder and the coated first powder without adding a liquid sintering agent to form an alloy body in situ.
A process for preparing an intermetallic dental restoration comprising the steps of:
- a) coating a first powder of at least one member selected from the group consisting of elemental metallic, alloy and intermetallic compounds with an oxide-replacing metal;
- and
- b) compacting orally, in situ, the coated first powder or a mixture of an elemental metallic second powder and the coated first powder without adding a liquid sintering agent to form the dental restoration.
A process for preparing an intermetallic alloy body comprising the steps of:
- a) coating a first powder of at least one member selected from the group consisting of elemental metallic, alloy and intermetallic compounds with an oxide-replacing metal;
- and
- b) compacting the coated first powder or a mixture of an elemental metallic second powder and the coated first powder at approximately body temperature and under an applied pressure without adding a liquid sintering agent to form an alloy body in situ.
A process for preparing an intermetallic alloy body comprising the steps of:
- a) coating a first Sn powder with an oxide-replacing metal;
- and
- b) compacting the coated first Sn powder or a mixture of an elemental metallic second Ag powder and the coated first Sn powder without adding a liquid sintering agent to form the alloy body in situ.
A process for preparing an intermetallic alloy body comprising the steps of:
- a) coating a first powder of Ag.sub.3 Sn atomized, spherical particles having an equiaxial particle size of from about 0.5 .mu. to about 50 .mu. with an oxide-replacing metal;
- and
- b) compacting the coated first powder or a mixture of an elemental metallic second powder and the coated first powder without adding a liquid sintering agent to form an alloy body in situ.
A process for compacting Ag and Sn powders at body temperature, in situ whereby the Ag and Sn powders are separately coated with an oxide-replacing metal.
Dependencies are inferred from the claim text.