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EP0070540A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Ceramic materials with a voltage-dependent nonlinear resistance

Assignee: Taiyo Yuden Co Ltd
•
Filing: 1982-07-16
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Granted: —
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Expires: 2002-07-16
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Abstract

Abstract Ceramic materials suitable for use in varistors, consisting essentially of a major proportion of SrTiO 3 , the balance being (1) at least one of Nb 2 O 5 , Ta 2 O 5 , WO 3 , La 2 O 3 CeO 2 , Nd 2 O 3 , Y 2 O 3 , Sm 2 O 3 Pr 6 O 11 , Eu 2 O 3 , and Dy 2 O 3 , for making the materials semiconductive, and (2) Na 2 O, for making surge-proof the varistors made from the ceramic materials. As desired, the compositions may further include one or more of Ag 2 O, CuO, MnO 2 , and SiO 2 for a higher nonlinearity coefficient. Containing Na 2 O in proportions ranging from approximately 0.02 to 2.50 mole parts, the ceramic compositions make possible the provision of varistors suffering little from current or voltage surges in use.

Inventors

  • 👤 Masuyama Masaru
  • 👤 Hirooka Susumu
  • 👤 Yamaoka Nobutatsu

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 15:40
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/115; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/47

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 98 words
A ceramic material with a voltage-dependent nonlinear resistance, comprising 100 mole parts of SrTiO 3 , from approximately.0.01 to approximately 3.00 mole parts of at least one metal oxide selected from the group consisting of Nb 2 O 5 , Ta 2 O 5 , WO 3 , La 2 O 3 , CeO 2 , Nd 2 O 3 , Y 2 O 3 , Sm 2 O3, Pr 6 O 11 , Eu 2 O 3 , and Dy 2 O 3 , and from approximately 0.02 to approximately 2.50 mole parts of Na 2 O.
Claim 2
Dependent Claim 98 words
A ceramic material with a voltage-dependent nonlinear resistance, comprising 100 mole parts of SrTiO 3 , from approximately.0.01 to approximately 3.00 mole parts of at least one metal oxide selected from the group consisting of Nb 2 O 5 , Ta 2 O 5 , WO 3 , La 2 O 3 , CeO 2 , Nd 2 O 3 , Y 2 O 3 , Sm 2 O3, Pr 6 O 11 , Eu 2 O 3 , and Dy 2 O 3 , and from approximately 0.02 to approximately 2.50 mole parts of Na 2 O.
Claim 3
Dependent Claim 40 words
A ceramic material as claimed in claim 1, further comprising from approximately 0.01 to approximately 3.00 mole parts of at least one oxide selected from the group consisting of Ag 2 0, CuO, MnO 2 , and SiO 2 .

References Cited (Backward Citations)

EP0044981A2 Cited

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