US Patent No. 10,462,899

CERAMIC SUBSTRATE AND ELECTRONIC DEVICE


Patent No. 10,462,899
Issue Date October 29, 2019
Title Ceramic Substrate And Electronic Device
Inventorship Isamu Kirikihira, Kirishima (JP)
Assignee KYOCERA CORPORATION, Kyoto-Shi, Kyoto (JP)

Claim of US Patent No. 10,462,899

1. A ceramic substrate, comprising:a silicon nitride crystal phase containing a plurality of silicon nitride crystals, and grain boundaries between the silicon nitride crystals; and
a silicate phase containing magnesium silicate crystals and rare earth silicate crystals, respective maximum particle sizes of the magnesium silicate crystals and the rare earth silicate crystals being smaller than that of the silicon nitride crystals, the silicate phase being positioned in the grain boundaries,
wherein the rare earth silicate crystals contain at least one of erbium silicate crystals and yttrium silicate crystals and the at least one of erbium silicate crystals and yttrium silicate crystals have minimum particle sizes that are smaller than that of the magnesium silicate crystals.