Lead-free resistive composition
US8257619B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2009 |
| Grant date | Sep 4, 2012 |
| Priority date | — |
| Expiry date | Sep 15, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C17/0654
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A substantially lead-free thick-film resistor paste composition is disclosed including a resistor composition dispersed in an organic vehicle. The resistor composition includes (a) RuO2 conductive material; (b) an α-oxide selected from CuO, Na2O, K2O, Li2O and combinations thereof (c) a borosilicate glass composition having: (i) B2O3, (ii) SiO2, (iii) a δ-oxide selected from BaO, CaO, ZnO, SrO, MgO and combinations thereof, and optionally including any of (iv) P2O5, (v) ZrO2 and (vi) Al2O3. The CuO α-oxide and TiO2, Ta2O5, Nb2O5 β-oxide(s) and combinations thereof are present in the paste composition either separately, or in the borosilicate glass composition, or both. The Na2O, K2O, Li2O α-oxide(s) and combinations thereof are present in the borosilicate glass composition. TCR values in the range of +/−100 ppm/° C. and R values of 100 ohms to 10 mega-ohms per square are obtained by resistors made from the paste composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.