公开(公告)号：US20230245805A1

公开(公告)日：2023-08-03

申请号：US18099008

申请日：2023-01-19

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuji YAMAGISHI ,  Yoshiyuki SATOU ,  Naoki MUTOU

IPC: H01C7/108 ,  H01C1/14

CPC classification number: H01C7/108 ,  H01C1/14

Abstract: A multilayer varistor according to the present disclosure includes a sintered compact, at least one pair of internal electrodes, and at least one pair of external electrodes. The sintered compact contains at least a Zn oxide and a Pr oxide. The at least one pair of internal electrodes are provided inside the sintered compact and contain, as a main component, at least one selected from the group consisting of Pd and Ag and, as a sub-component, an oxide of at least one element selected from the group consisting of Pr, Mn, Co, and Sb. The at least one pair of external electrodes are arranged to cover the sintered compact partially and electrically connected to the at least one pair of internal electrodes, respectively.

公开(公告)号：US20230245806A1

公开(公告)日：2023-08-03

申请号：US18098998

申请日：2023-01-19

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Naoki MUTOU ,  Yoshiyuki SATOU ,  Yuji YAMAGISHI ,  Ken YANAI

IPC: H01C7/112 ,  H01C7/18 ,  C04B35/453 ,  C04B35/64

CPC classification number: H01C7/112 ,  C04B35/64 ,  C04B35/453 ,  H01C7/18

Abstract: A method for manufacturing a multilayer varistor includes: a first step including providing a multilayer stack in which a plurality of green sheet layers, each containing a Zn oxide powder as a main component and a Pr oxide powder as a sub-component, and a plurality of internal electrode paste layers, each containing a Pd powder, are alternately stacked; and a second step including forming a sintered compact, including an internal electrode inside, by baking the multilayer stack. The second step includes: a first sub-step including baking the multilayer stack by setting an oxygen concentration in an atmosphere at 1000 ppm by volume or less while increasing a temperature from 500° C. to 800° C.; and a second sub-step including baking, after the first sub-step, the multilayer stack by setting the oxygen concentration in the atmosphere at 1000 ppm by volume or more while increasing the temperature to a maximum allowable temperature.