Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Reexamination Certificate
2002-02-12
2003-10-21
Mai, Ngoclan (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
C075S235000, C075S236000, C075S244000, C419S012000, C419S013000, C419S014000, C419S019000, C419S028000, C419S042000, C419S048000
Reexamination Certificate
active
06635098
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to titanium and titanium alloy and titanium matrix composite components manufactured by using a low cost material or feedstock for casting, extrusion or forging. The feedstock of this invention is composed of a consolidated blend of titanium or titanium alloy fine turnings mixed with titanium or titanium alloy in powder metal form. The low cost material or feedstock is formed into a billet or other preform shape.
2. Description of the Related Art
Titanium and titanium alloy component shapes are typically machined from mill products, that are in the form of a bar, plate or sheet. The machining operations are expensive and the large excess of expensive titanium raw material which must be discarded is costly since the machining scrap has low value compared to the prime mill product. In order to reduce machining and material loss, industry frequently utilizes casting, extrusion or forging practices to produce near net shape components that are closer to final size. The material typically used as starting stock in these operations is titanium or titanium alloy mill product in billet form. These processes result in producing a component shape close to final size and save the significant expense of machining the entire billet stock.
More recently, titanium powder metallurgy has been proven to offer an additional approach to producing close to shape components. As shown in U.S. Pat. No. 5,897,830, the contents of which are herein incorporated by reference, the application of a powder metal consolidated billet has shown an advantage in its use as a casting electrode for casting titanium metal matrix composites.
SUMMARY OF THE INVENTION
The product of this invention incorporates waste from titanium and titanium alloy machining, referred to as turnings, with the powder metal blend to form a consolidated component. The powder metal can be a blend of powders, such as commercially pure titanium powder and master alloy powder. This consolidated component may be in the form of a billet, which can be used as starting stock for extrusion and forging operations.
Many potential applications for titanium and titanium alloys are not commercialized because of the high cost of the raw material. The technologies utilized in this invention permit the manufacture of more economical components by utilizing a low cost material as starting stock for production of cast or extruded shapes. The low cost material for the production of cast or extruded shapes may be in the form of a billet. In addition, low cost bar or preforms comprising titanium and titanium alloy machine turnings may be used as starting stock for manufacture of forged shapes.
REFERENCES:
patent: 2906654 (1959-09-01), Abkowitz
patent: 3729971 (1973-05-01), Gurganus et al.
patent: 3933473 (1976-01-01), Dickson
patent: 3953205 (1976-04-01), Cox et al.
patent: 5332545 (1994-07-01), Love
patent: 5897830 (1999-04-01), Abkowitz et al.
Abkowitz Stanley
Abkowitz Susan M.
Heussi Harold L.
McCarthy Kevin M.
Dynamet Technology Inc.
Finnegan Henderson Farabow Garrett & Dunner LLP
Mai Ngoclan
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