Electroceramic component comprising a plurality of contact surfaces
An electrical component includes a ceramic base body having at least four contact surfaces. Two of the contact surfaces are on opposite sides of the ceramic base body. First protective layers are arranged on regions of the opposite sides of the ceramic base body that do not include the contact surfaces. The first protective layers have a composition that allows the first protective layers to be sintered at a higher temperature than the contact surfaces. Second protective layers are arranged on at least two opposite surfaces of the ceramic base body. The ceramic base body, the first protective layers, and the second protective layers are sintered together.
1. An electrical component comprising:
a ceramic base body having at least four contact surfaces, two of the contact surfaces being on opposite sides of the ceramic base body;
first protective layers on regions of the sides of the ceramic base body that do not include the contact surfaces, the first protective layers having a composition that allows the first protective layers to be sintered at a higher temperature than the contact surfaces; and
second protective layers on at least two opposite surfaces of the ceramic base body;
wherein the ceramic base body, the first protective layers, and the second protective layers are sintered together.
2. The electrical component of claim 1 , wherein the second protective layers are on all four of the contact surfaces and on areas of the ceramic base body that do not include the first protective layers.
3. The electrical component of claim 1 , further comprising:
electrically conducting electrode layers in the ceramic base body, the electrode layers being separated from each other by regions of the ceramic base body;
wherein each of the contact surfaces is connected to several electrode layers.
4. The electrical component of claim 1 , wherein the first and second protective layers are formed from a same ceramic material.
5. The electrical component of claim 1 , wherein the ceramic base body includes a varistor ceramic, a capacitor ceramic, or a magnetic ceramic.
6. The electrical component of claim 1 , wherein at least one of the first and second protective layers has a resistance that is high enough to provide insulation between at least two contact surfaces.
7. The electrical component of claim 1 , wherein at least one of the first and second protective layers comprises a spinel ceramic with composition AB 2 O 4 , where A is a two-valence and B is a three- or four-valence metal or a perovskite having the following general formula:
M II x M III 1−x Ti IV x+y Co II y Co III 1−x−2y O 3 ;
wherein M II is either strontium or barium and M III is a rare earth element; and
wherein:
0≦ x< 0.85; 0< y< (1 −x )/2 and x+y ≦ 1.
8. The electrical component of claim 1 , wherein at least one of the first protective layers and the second protective layers includes a lead-lanthanum-zirconium-titanate ceramic (Pb,La)(Zr,Ti)O 3 .