Multilayer ceramic capacitor and manufacturing method of multilayer ceramic capacitor
AssigneeTaiyo Yuden Co., Ltd.
InventorMaki INOUE
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Abstract
A multilayer ceramic capacitor includes: a multilayer structure in which each of dielectric layers and each of internal electrode layers are alternately stacked, a main component of the dielectric layers being ceramic, a main component of the internal electrode layers being a metal, wherein: an existence rate of crystal grains satisfying b/a<1 of crystal grains included in the internal electrode layer is 70% or more, when a thickness of the internal electrode layer is “a” and a length of crystal grains of a main component metal of the internal electrode layer in an extension direction of the internal electrode layer is “b”; and the internal electrode layer includes a grain of which a main component is ceramic.
Claims9
A multilayer ceramic capacitor comprising:
- a multilayer structure in which each of dielectric layers and each of internal electrode layers are alternately stacked, a main component of the dielectric layers being ceramic, a main component of the internal electrode layers being a metal,
- wherein:
- an existence rate of crystal grains satisfying b/a<1 of crystal grains included in the internal electrode layer is 70% or more, when a thickness of the internal electrode layer is “a” and a length of crystal grains of a main component metal of the internal electrode layer in an extension direction of the internal electrode layer is “b”;
- and
- the internal electrode layer includes a grain of which a main component is ceramic.
A manufacturing method of a multilayer ceramic capacitor comprising:
- a first step of forming a pattern of a metal conductive paste on a green sheet including ceramic powders, a main component of the metal conductive paste being metal powders of which an average grain diameter is 100 nm or less and of which a standard deviation of grain size distribution is 1.5 or less, the metal conductive paste including ceramic powders as a co-material, an average grain diameter of the co-material being 10 nm or less, a standard deviation of grain size distribution of the co-material being 5 or less;
- and
- a second step of baking a ceramic multilayer structure obtained by stacking a plurality of layer units obtained by the first step,
- wherein an existence rate of crystal grains satisfying b/a<1 of crystal grains included in an internal electrode layer obtained by sintering of the metal powders in the second step is 70% or more, when a thickness of the internal electrode layer is “a” and a length of crystal grains of a main component metal of the internal electrode layer in an extension direction of the internal electrode layer is “b”.
Dependencies are inferred from the claim text.