Patent ID: 7998561

Claim:
A ceramic laminate comprising: at least one ceramic sheet having first ceramic particles and glass particles; and at least one constraining sheet having second ceramic particles and alternating with the ceramic sheet while the constraining sheet and the ceramic sheet are in contact with each other, wherein the glass particles and the first ceramic particles each have a larger particle size than the second ceramic particles, and the first ceramic particles have a particle size of 1 μm or more, the glass particles have a particle size within the range of 1 μm to 10 μm, and the second ceramic particles have a particle size of 1 μm or less, wherein the glass particles comprise a composition represented by (Ca, Sr, Ba)O—Al 2 O 3 —SiO 2 —ZnO—B 2 O 3 , wherein the ceramic sheet comprises 40 to 80 wt % of the glass particles and 20 to 60 wt % of the first ceramic particles, wherein the 40 to 80 wt % of the glass particles comprise 2 to 10 wt % of ZnO, and wherein the constraining sheet does not contain glass particles.