Coated wire
AssigneesHeraeus Electronics GmbH & Co. KG, Heraeus Materials Singapore Pte. Ltd.
InventorsMurali Sarangapani, Yee Weon Lim, Wai Khee See Tho, Mariyappan Dhayalan, Chee Chow Tan, Juergen Scharf, Sungsig Kang
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Abstract
A wire comprising a wire core with a surface, the wire core having a coating layer superimposed on its surface, wherein the wire core itself is a silver-based wire core, wherein the coating layer is a double-layer comprised of a 1 to 100 nm thick inner layer of nickel or palladium and an adjacent 1 to 250 nm thick outer layer of gold, characterized in that the wire exhibits a total carbon content of ≤40 wt.-ppm.
Claims17
A wire comprising a wire core with a surface, the wire core having a coating layer superimposed on the wire core surface, wherein
- the wire core is a silver-based wire core, the silver-based wire core consisting of a silver-based material in the form of a doped silver, a silver alloy, or a doped silver alloy,
- the coating layer is a double-layer consisting of a 1 to 30 nm thick inner layer of nickel and an adjacent 20 to 200 nm thick outer layer of gold,
- the wire exhibits a total carbon content of ≤40 wt.-ppm, and
- the carbon content of the wire surface is in a range from 0.5 to less than 2.5 mg of carbon per square meter.
A wire comprising a wire core with a surface, the wire core having a coating layer superimposed on the wire core surface, wherein
- the wire core is a silver-based wire core,
- the coating layer is a double-layer comprised of a 1 to 100 nm thick inner layer of nickel or palladium and an adjacent 1 to 250 nm thick outer layer of gold,
- the wire exhibits a total carbon content of ≤40 wt.-ppm,
- the outer layer of gold comprises at least one member selected from the group consisting of antimony, bismuth, arsenic and tellurium in a total proportion ranging from 10 to 100 wt.-ppm based on the weight of the wire, wherein the at least one member selected from the group consisting of antimony, bismuth, arsenic and tellurium is present in the outer layer of gold in a concentration gradient that increases in a direction perpendicular to the longitudinal axis of the wire core.
A wire comprising a wire core with a surface, the wire core having a coating layer superimposed on the wire core surface, wherein
- the wire core is a silver-based wire core, the silver-based wire core consisting of a silver-based material in the form of a doped silver, a silver alloy, or a doped silver alloy,
- the coating layer is a double-layer comprised of a 1 to 100 nm thick inner layer of nickel or palladium and an adjacent 1 to 250 nm thick outer layer of gold,
- the wire exhibits a total carbon content of ≤40 wt.-ppm,
- the carbon content of the wire surface is in a range from 0.5 to less than 2.5 mg of carbon per square meter,
- the outer layer of gold comprises at least one member selected from the group consisting of antimony, bismuth, arsenic and tellurium in a total proportion ranging from 10 to 100 wt.-ppm based on the weight of the wire, and
- the at least one member selected from the group consisting of antimony, bismuth, arsenic and tellurium is present in the outer layer of gold in a concentration gradient that increases in a direction perpendicular to the longitudinal axis of the wire core.
Dependencies are inferred from the claim text.