Electrically conductive tip member and method for producing the same
AssigneesNGK Insulators, Ltd., Tohoku University
InventorsNaokuni MURAMATSU, Takanari NAKAJIMA, Takashi GOTO
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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.
Claims15
An electrically conductive tip member comprising:
- an inner periphery portion containing 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.
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, the raw material containing Cu and having higher electrical conductivity than the inner periphery portion;
- disposing a raw material powder for the inner periphery portion on an inner circumferential side of the raw material of the outer periphery portion, the raw material powder having an alloy composition of Cu-xZr (where x is the atomic percentage of Zr and satisfies 0.5≤x≤16.7) obtained using a powder containing Cu and a Cu—Zr master alloy or a powder containing Cu and ZrH2;
- pressurizing and holding the raw material powder in a prescribed pressure range at a prescribed temperature lower than a eutectic point temperature;
- and subjecting the raw material powder to spark plasma sintering.
Dependencies are inferred from the claim text.