Methods for modifying oxygen content of atomized intermetallic aluminide powders and for forming articles from the modified powders
AssigneePhilip Morris USA Inc.
InventorsFirooz Rasouli, Clive Scorey, John McKernan, John F. Cunningham
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Abstract
Methods of producing atomized intermetallic aluminide powders with a controlled oxygen content, and articles made from the powders by powder metallurgical techniques are disclosed. Gas atomized intermetallic aluminide powders can be oxidized to increase their oxygen content. Water atomized intermetallic aluminide powders can be milled to change their size, shape and/or oxygen content. Blends or mixtures of modified gas and water atomized intermetallic aluminide powders can be processed into articles by powder metallurgical techniques.
Claims39
A method of making an intermetallic aluminide article having a controlled oxide content by a powder metallurgical technique, comprising:
- modifying at least one of the particle size, particle shape, oxygen content and oxygen distribution of a water atomized intermetallic aluminide powder to form a first modified powder;
- combining the first modified powder and a gas atomized intermetallic aluminide powder to form a powder mixture;
- and
- processing the powder mixture into an article by a powder metallurgical technique.
A method of producing modified atomized intermetallic aluminide powder, comprising:
- modifying at least one of the average particle size, particle shape, oxygen content and oxide distribution of a water atomized intermetallic aluminide powder to form a first modified powder;
- modifying the oxygen content of a gas atomized intermetallic aluminide powder to form a second modified powder;
- and
- combining the first modified powder and the second modified powder to form an intermetallic aluminide powder blend or mixture.
A method of producing modified atomized intermetallic aluminide powder, comprising:
- modifying a water atomized intermetallic aluminide to form first modified powder;
- modifying the oxygen content of a gas atomized intermetallic aluminide powder to form a second modified powder;
- and
- combining the first modified powder and the second modified powder to form an intermetallic aluminide powder blend or mixture.
The method of producing modified atomized intermetallic aluminide powder, comprising:
- modifying at least one of the average particle size, particle shape, oxygen content and oxide distribution of a water atomized intermetallic aluminide powder to form a first modified powder;
- and
- modifying the oxygen content of a gas atomized intermetallic aluminide powder to form a second modified powder;
- wherein:
- the water atomized intermetallic aluminide powder is milled to reduce the average particle size and change the particle shape thereof;
- and
- the gas atomized intermetallic aluminide powder is oxidized to increase the oxygen content thereof.
A method of making an intermetallic aluminide article having a controlled oxygen content by a powder metallurgical technique, comprising:
- processing a blend or mixture comprising a water atomized intermetallic aluminide powder and a gas atomized intermetallic aluminide powder and a binder into an article by a powder metallurgical technique;
- and heating the article in an oxygen-containing atmosphere to increase an oxygen content of the article and to remove the binder in the article.
A method of making an intermetallic aluminide article having a controlled oxygen content by a powder metallurgical technique, comprising:
- modifying at least one of the average particle size, particle shape, oxygen content and oxygen distribution of a water atomized iron aluminide powder to form a first modified powder;
- modifying the oxygen content of a gas atomized iron aluminide powder to form a second modified powder;
- tape casting an article comprising a blend or mixture of the first modified powder and the second modified powder;
- and sintering the article.
Dependencies are inferred from the claim text.