National Taiwan University

Other

Yuh-Ruey Wang

Sea-Fue Wang

Chun-Ting Yeh

Hsi-Chuan Lu

Bo-Sen Yang

Mei-Hui Hsiao

A dielectric ceramic composition is disclosed. The dielectric ceramic composition of the present invention comprises BaTiOas the main component and one or more subcomponents. The one or more subcomponents include ScO, MgCO, BaSiO, MnCO, LaO, COOand NiO. An end product of the present invention may be formed after BaTiOand the subcomponents undergo the following steps: (1) Wet mixing using a ball mill (2) Sintering in a reducing atmosphere (3) Annealing. The dielectric ceramic composition of the present invention can satisfy the X8R characteristic of the EIA standard and is compact or dense enough.

Dielectric ceramic composition

A thermally conductive silicone composition includes 25 to 50 volume % of a silicone, 30 to 60 volume % of a first heat conducting filler, and 20 to 40 volume % of a second heat conducting filler, and 1 to 2 volume % of a third heat conducting filler. The thermally conductive silicone composition has two heat conducting fillers with different sizes dispersed therein, thus the thermal impedance can be efficiently reduced.

Thermally conductive silicone composition

The present invention relates to a low-temperature sintered barium titanate microwave dielectric ceramic material. The host matrix thereof can be represented by BaTiMO, where x is 1&#x2dc;6, y is 1&#x2dc;17, z is 0&#x2dc;1, k is 0&#x2dc;3, M is an element substituting the Ba or Ti ion, for example selected from an alkali metal, an alkaline-earth metal, a transition group or a rare earth group, and preferably BaTiOor the host matrix containing Zr, Sn, Zn, etc. According to the present invention, a low melting glass is added and a subsequent milling operation is performed to reduce the sintering temperature of the microwave dielectric ceramic material to less than 1,000&#xb0; C. The low melting glass can be for example the Ba&#x2014;B&#x2014;Si&#x2014;Li glass, Ba&#x2014;B&#x2014;Zn&#x2014;Si&#x2014;Li glass, Ba&#x2014;B&#x2014;Si&#x2014;Li&#x2014;Cu glass or Cu&#x2014;B&#x2014;Zn&#x2014;Si&#x2014;Li glass.

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Taipei County, Taiwan

Yuh-Ruey Wang