SAMSUNG ELECTRO-MECHANICS CO., LTD. (Suwon-si, KR)
Electronic components made of ceramic materials, such as piezoelectric elements and capacitors, or varistors, are equipped with bodies made of ceramic that are made of ceramic material. A internal electrode is built into the body. External electrodes are installed on the ceramic body to connect to the internal electrode.
As electronic devices are becoming more compact and multi-functional, chip components are also extremely functional and miniaturized which means that high capacity products, like for example, multilayer ceramic capacitors having small sizes andhigh capacities, are in high demand.
It is essential to choose dielectric materials with excellent dielectric properties that can withstand high voltages and micro-sizing of multilayer ceramic capacitors.
In addition, the dielectric needs to be reduced and the electrode’s effective area must be significantly expanded (increasing capacity implementation’s volume of effective percentage).
A local decrease in dielectric thickness can result from the marginal step difference, as well as the thinning. It is important to implement structural modifications to decrease the chance of having to resisting voltage drops.
To implement a small-sized, high-capacity multilayer ceramic capacitor like the one mentioned above, and to avoid a resist voltage drop phenomenon it is possible to expose the inner electrode along the width. This allows for a substantial increases in the area of the electrode in this direction. A separate margin portion is connected in the width direction to the electrode exposed on the other side of the chip. This is done in the procedure prior to firing the chip as previously mentioned.
But, when the multilayer ceramic capacitor is constructed in the manner described above the dielectric composition of the ceramic body is utilized as-is, and without distinguishing the dielectric composition of the side margins from the dielectric compositionof the ceramic body.
The gap at the interface between electrode end and margin portion join surfaces is unfilled. This is because of the issue caused by a decrease in densification as well as the sintering drive mismatching phenomenon caused by the dielectric of edge margins and the electrode’s internal.
In addition, since in the art of similar inventions, a ceramic dielectric sheet that serves as a margin is joined to a green chip without a margin, through physical compression, and then the sintered body with an elongated body is created through a high temperatureheat treatment. Thus, in this case it is when the force of adhesive between the electrode exposed surface and the sheet used for creating a margin in the operation before sintering, it is not enough, and a poor appearance due to loss of margins and severe cracks in the interfacial surface could develop.
In addition, voids can be generated between the electrode end and the margin interface , when the volume change occurs inside the chip due to shrinkage of the internal electrode in high-temperature heat treatment and serve as a start point for crack generation or an entrance point for moisture and resulting in a decrease in the reliability of moisture resistance.
In addition, to solve the above problems, when the material with high sintering driving force is applied as a general method, the aggregation of an outermost internal electrode near the interface due to excessive grain growth is intensified,resulting in increasing a drop in withstand voltage due to the electrode and dielectric layer unevenness.
Therefore, the dielectric of the margin region should have an excellent sintering driving force, so that the same sintered-body density as that of the ceramic body may be ensured, even with a low physical filling density, thereby significantlyreducing the decrease in the strength of the multilayer ceramic capacitor.
Additionally the dielectric material that is used in the margin area should be able to more actively move the material at an elevated temperature, thereby filling the void at the edge.
Additionally the force of bonding at the interface is enhanced by the formation of an oxide layer on the end joining surface by reaction with the internal electrode.
This Summary provides a handful of concepts in simplified form. The concepts will be further explained in the Detailed Description. The Summary is not intended to define the most important features or essential features in the subject matter claimed. The Summary is also not meant to be used to determine the claim’s scope.
One feature of this invention is the provision of a multilayer ceramic capacitor with large capacity, which can withstand high temperatures and moisture. Furthermore, it provides a method for making it.
A multilayer ceramic capacitor is described in an aspect of the disclosure. It comprises a ceramic body having first and secondary surfaces that are opposite to one another and fourth and third surfaces connecting them, a plurality of internal electrodes that are positioned inside the body of the ceramic. The end of the internal electrodes can be exposed from either the fourth or third surface. Additionally, there is a first side margin, and a second one, respectively, which are disposed on the first and the second surfaces. End portions of the multiple internal electrodes can then be exposed The first and second side margins include a base material powder of the barium titanate-based basis powder and a subcomponent. The subcomponentincludes terbium (Tb) as a first subcomponent including a lanthanide rare earth element, and a content ratio of the terbium (Tb) to a content of the first subcomponent (RE) excluding the terbium (Tb) satisfies 0.110.ltoreq.Tb/RE.ltoreq.2.333.
According to a particular aspect of the disclosed disclosure multilayer ceramic capacitor comprises the body of a ceramic with two surfaces that are opposite to each other, as well as third and fourth surfaces connecting the second and first surfaces, and a number of internal electrodes disposed inside the ceramic body, exposing to the first and second surfaces, and having an exposed end that is exposed from either the third or fourth surface. There is also an initial side margin and the second side margin located on the first and second surfaces where end portions of the plurality of electrodes inside are exposed. The base powder of a barium titaniumate-based base powder is incorporated on the first and second sides, as well as a subcomponent. The subcomponent comprises the element terbium (Tb) as a first subcomponent that also contains the rare earth element lanthanide. A content ratio of the terbium (Tb) to a content of the first subcomponent (RE) excluding the terbium (Tb) satisfies 0.110.ltoreq.Tb/RE.ltoreq.2.333. A dielectriccomposition included in the first and second side margins and a dielectric composition included in the ceramic body are different from each other, and a content of the terbium (Tb) included in the first and second side margins is more than a content ofterbium (Tb) included in the ceramic body. The ratio of content of Tb (terbium) in the first side margins to that of the base material powder contained in the first side margins is higher than the ratio of content (Tb) in the ceramic bodies, to the amount of barium titanate base powder.
In accordance with an aspect of the disclosed disclosure, multilayer ceramic capacitor comprises an elongated ceramic body that has first and second surfaces opposing each other, as well as the fourth and third surfaces connecting the first and second surfaces, a pluralityof internal electrodes disposed inside the ceramic body and exposed from the first and second surfaces, and each one having an end that is exposed through the third surface or the fourth, and an initial side margin and an additional side margin located on the first and second surfaces, from which end portions of the array of electrodes inside are exposed. The first and second side margins comprise an element of base material that is an based on barium titanate base powder as well as an additional component. The subcomponentincludes the element terbium (Tb) and some other lanthanide rare earth elements as a primary subcomponent. A content ratio of terbium (Tb) contained in the second and first side margins, to the amount of the base material powder, which is included in the first andsecond side margins is greater than a content ratio of the terbium (Tb) present in the ceramic body to the barium titanate-based powder that is that is contained in the body of the ceramic. A content of the terbium (Tb) satisfies 0.15 mol.ltoreq.Tb.ltoreq.1.35mol with respect to 100 mol of the base material powder included in the first and second side margins.Click here to view the patent on USPTO website.
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