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US 8,133,432 B2Granted
Conductive material
AssigneeIshifuku Metal Industry Co., Ltd.
InventorKoichi Hasegawa
Life of this patent
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Abstract
Provided is a conductive material to be used for a resistor and a sensor, which is enhanced its mechanical strength while maintaining a stable resistance ratio. In the conductive material used for the resistor and the sensor, 400 to 10,000 ppm of Sr is contained in Pt, and the balance is an inevitable impurity. An intermetallic compound phase formed of Pt and Sr is precipitated and dispersed in Pt.
Claims2
A conductive material formed of a Pt alloy, the material consisting of:
- Pt;
- 600 to 10,000 ppm of Sr;
- and
- an inevitable impurity as the balance;
- wherein the Pt alloy has been subjected to a heat treatment sufficient to produce an intermetallic compound phase formed of Pt and Sr which intermetallic compound is precipitated and dispersed in Pt;
- and
- wherein the conductive material has a stable resistance ratio whose change rate is no greater than 0.02% even after heating the conductive material at 600° C. for 500 hours.
4 more elements
Dependencies are inferred from the claim text.