Loading patent…
AssigneesTanaka Kikinzoku Kogyo K.K., Kyoto University
InventorsKunihiro Shima, Kenji Goto, Yasushi Masahiro, Asaka Ueno, Hiroo Iwata, Ryusuke Nakai, Tomonobu Kodama
Estimating the term…
The present invention provides an alloy for medical use including an Au—Pt alloy, in which the Au—Pt alloy has a Pt concentration of 24 mass % or more and less than 34 mass % with the balance being Au, and has at least a material structure in which a Pt-rich phase having a Pt concentration higher than that of an α-phase is distributed in an α-phase matrix, the Pt-rich phase has a Pt concentration that is 1.2 to 3.8 times the Pt concentration of the α-phase, and the Pt-rich phase has an area ratio of 1 to 22% in any cross-section. This alloy is an artifact-free alloy material that exhibits excellent compatibility with a magnetic field environment such as an MRI and has magnetic susceptibility of ±4 ppm with respect to magnetic susceptibility of water.
An alloy for medical use consisting of an Au—Pt alloy, wherein the Au has a purity of 99.99 mass % or more and the Pt has a purity of 99.99 mass % or more, wherein the Au—Pt alloy has a Pt concentration of 28 mass % or more and less than 34 mass % with a balance being Au, and has at least a material structure in which a Pt-rich phase having a Pt concentration higher than that of an α-phase is distributed in an α-phase matrix, the Pt-rich phase exhibits a lamella structure directed into a grain from a grain boundary of the Au—Pt alloy, and the Pt-rich phase has a Pt concentration that is 1.2 to 3.8 times the Pt concentration of the α-phase, and the Pt-rich phase has an area ratio of 1 to 22% in any cross-section, and the Au—Pt alloy has magnetic susceptibility from −13 ppm to −5 ppm.
Dependencies are inferred from the claim text.