Electrically conductive tip member and method for producing the same
AssigneeNGK Insulators, Ltd.
InventorsNaokuni Muramatsu, Takanari Nakajima, Takashi Goto
Life of this patent
Estimating the term…
Abstract
An electrically conductive tip member includes: an inner periphery portion including a Cu matrix phase and a second phase that is dispersed in the Cu matrix phase and contains a Cu—Zr-based compound, the inner periphery portion having an alloy composition of Cu-xZr (where x is the atomic percentage of Zr and satisfies 0.5≤x≤16.7); and an outer periphery portion that is present on an outer circumferential side of the inner periphery portion, made of a metal containing Cu, and has higher electrical conductivity than the inner periphery portion.
Claims8
A method for producing an electrically conductive tip member including an inner periphery portion and an outer periphery portion that is present on an outer circumferential side of the inner periphery portion and has higher electrical conductivity than the inner periphery portion,
- the method comprising a sintering step of:
- disposing a raw material of the outer periphery portion, which contains Cu and has a higher electrical conductivity than the inner periphery portion;
- disposing a raw material powder for the inner periphery portion, which has an alloy composition of Cu-xZr, where is the atomic percentage of Zr and satisfies 0.5≤16.7, obtained from a powder containing Cu and a Cu—Zr master alloy or a powder containing Cu and ZrH2, on an inner circumferential side of the raw material of the outer periphery portion;
- pressurizing and holding the raw material powders of the outer peripheral portion and the inner peripheral portion in a prescribed pressure range at a prescribed temperature lower than the Cu—Zr eutectic point temperature of the raw material powders of the outer peripheral portion and the inner peripheral portion;
- and simultaneously subjecting the raw material powders of the outer peripheral portion and the inner peripheral portion to spark plasma sintering.
Dependencies are inferred from the claim text.