초록 ▼

This invention presents the process of direct laser casting of copper alloys: Cu—X (where X=Ni, Fe, W;) and their composites Cu—Y and Cu—X—Y (Y=WC, TiC, Ti+C) from powders prepared using mechanical mixing and ball milling processes. Since the metallic powder is combined with

This invention presents the process of direct laser casting of copper alloys: Cu—X (where X=Ni, Fe, W;) and their composites Cu—Y and Cu—X—Y (Y=WC, TiC, Ti+C) from powders prepared using mechanical mixing and ball milling processes. Since the metallic powder is combined with a low melting point Cu metal, which has good thermal and electrical conductivity, the combination allows the powder mixture to be melted by CO2laser and re-solidified into a part with good mechanical properties and conductivity. The laser casting process for the Cu-based in-situ formation and the material systems formed using the said method have been developed. The process can be used to fabricate complex three-dimensional objects by multi-layer overlapping and the material systems can be used to build rapid tooling due to the properties of good thermal conductivity and low wear rate.

대표청구항 ▼

This invention presents the process of direct laser casting of copper alloys: Cu—X (where X=Ni, Fe, W;) and their composites Cu—Y and Cu—X—Y (Y=WC, TiC, Ti+C) from powders prepared using mechanical mixing and ball milling processes. Since the metallic powder is combined with

This invention presents the process of direct laser casting of copper alloys: Cu—X (where X=Ni, Fe, W;) and their composites Cu—Y and Cu—X—Y (Y=WC, TiC, Ti+C) from powders prepared using mechanical mixing and ball milling processes. Since the metallic powder is combined with a low melting point Cu metal, which has good thermal and electrical conductivity, the combination allows the powder mixture to be melted by CO2laser and re-solidified into a part with good mechanical properties and conductivity. The laser casting process for the Cu-based in-situ formation and the material systems formed using the said method have been developed. The process can be used to fabricate complex three-dimensional objects by multi-layer overlapping and the material systems can be used to build rapid tooling due to the properties of good thermal conductivity and low wear rate. th radially-outward directed threads projecting outwardly away from the base, said nipple having a flow passage in fluid communication with the outlet in the filter head, and a valve member moveably located in said nipple, said valve member normally in a first position preventing flow through the nipple to the outlet, and a moveable to a second position allowing flow through the nipple to the outlet, said valve member including a portion projecting outwardly from said nipple that includes radially-outward directed threads, the threads on said outwardly-projecting portion having a pitch angle different than the pitch angle of the threads on the nipple. 25. The filter head as in claim 24, wherein said valve member in the filter head includes a circular body, a plurality of elongated fingers projecting axially away from one surface of said body, and an elongated cylindrical engaging portion extending away from an opposite surface of said body, said engaging portion including the radially outward directed threads of the member.26. The filter head as in claim 24, wherein the threads on the outwardly-projecting portion of the valve member have a greater pitch angle than the threads on the nipple.27. A filter element including a cylindrical housing and a ring filtration media disposed within said housing and circumscribing a central axis, said ring of filtration media including first and second ends, said filter element further including first threaded means for receiving the threads on a nipple of a filter head, said first threaded means having threads of a first