Member having separation structure and method for manufacture thereof
A member having a separated structure made by an alloy consisting of two regions having different compositions with each other is formed by casting a molten alloy into a prescribed shape, or by spray-quenching the same from a temperature of Tc+10° C. or more, wherein the molten alloy exhibits two ph...
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| Main Authors | , , |
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| Format | Patent |
| Language | English |
| Published |
10.06.2004
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| Online Access | Get full text |
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| Summary: | A member having a separated structure made by an alloy consisting of two regions having different compositions with each other is formed by casting a molten alloy into a prescribed shape, or by spray-quenching the same from a temperature of Tc+10° C. or more, wherein the molten alloy exhibits two phase separation in a liquid state having a temperature difference T between the maximum temperature Tc (° C.) and minimum temperature Td (° C.) in the region of two phase separation in the liquid state being 10° C. or more, and the molten alloy has a mean composition with a difference of the volume fraction between the two liquid phases of 5% by volume or more. The suitable alloy is a Cu-Fe-X alloy, a Cu-Cr-X alloy, a Cu-Co-X alloy, a Cu-Bi-X alloy, an Al-Sn-X alloy or an Al-In-X alloy. The powder obtained by spray-quenching any one of the molten alloys of the Cu-Bi-X alloy, the Al-Sn-X alloy and the Al-In-X alloy has a separated structure comprising a surface portion having a solder composition and a core portion with a composition mainly comprising Cu and Al being excellent in electrical conductivity and heat conductivity and is suitable as a solder ball. |
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