Murata Manufacturing Co., Ltd.

Machiko Motoya

Takahiro Sumi

Tsuyoshi Katsube

Yoichi Moriya

Jun Urakawa

Masahiro Kubota

Kenta Kondo

Tsutomu Tatekawa

Tomonori Sakata

Sumiyo Wakaki

A photosensitive conductive paste that contains (a) a conductive powder in an amount of 70.3 to 85.6 mass % with respect to the total amount of the photosensitive conductive paste; (b) a photosensitive resin composition containing an alkali-soluble polymer, a photosensitive monomer, a photopolymerization initiator, and a solvent; and (c) a glass frit. The mass ratio of the glass frit to the conductive powder is 0.020 to 0.054, and the glass frit has a softening point that is equal to or above the temperature at which sintering of the conductive powder starts.

Photosensitive conductive paste, method of producing multilayer electronic component using the same, and multilayer electronic component

A first paste film containing a metal powder and non-vitreous inorganic oxide is formed on a glass ceramic green sheet, and a second paste film containing a metal powder is formed on the first paste film to cover at least the edge portion of the first paste film. Then the glass ceramic green sheet and the first and second paste films are fired. As a result, a surface electrode is obtained, and then a plating layer is formed on the surface electrode. The second paste film contains less non-vitreous inorganic oxide than the first paste film and the abundance ratio of the non-vitreous inorganic oxide in the surface electrode is lower in a region bordering the plating layer than in a region bordering the glass ceramic layer at least in an edge portion of the surface electrode.

Glass ceramic substrate and method for producing the same

Provided is a mono- or multilayer ceramic substrate which exhibits a high flexural strength. The substrate contains a sintered ceramic which includes respective crystal phases of quartz, alumina, fresnoite, sanbornite, and celsian, in which the relationship between the diffraction peak intensity A in the (201) plane of the fresnoite and the diffraction peak intensity B in the (110) plane of the quartz, measured by a powder X-ray diffractometry in the range of the diffraction peak angle&#x3b8;=10 to 40&#xb0;, is A/B&#x2267;2.5. The fresnoite crystal phase preferably has an average crystal grain size of 5 &#x3bc;m or less. In firing to obtain this ceramic sintered body, the maximum temperature falls within the range of 980 to 1000&#xb0; C.

Ceramic sintered body and method for producing ceramic sintered body

In order to enable non-shrinkage firing, the strength of a multilayer ceramic substrate is increased by a method including alternately stacking a base material layer and a constrained layer which is not sintered at the sintering temperature for the base material layer, and allowing the material of the base material layer to flow into the constrained layer while subjecting the base material layer to sintering, thereby achieving densification of the constrained layer. The base material layer and the constrained layer each include celsian, and less celsian is provided in the base material layer than in the constrained layer. In order to increase the strength of the base material layer, the addition of a Ti component, rather than an increased content of Al component which interferes with sintering of the base material layer, causes fresnoite to be deposited in the base material layers.

Multilayer ceramic substrate

A low-temperature sintering ceramic material showing little variation in composition after firing, realizing high bending strength in a sintered body, and capable of forming a reliable ceramic substrate showing high peel strength of a surface electrode includes a main constituent ceramic material containing about 48 weight % to about 75 weight % in terms of SiOof Si, about 20 weight % to about 40 weight % in terms of BaO of Ba, and about 5 weight % to about 20 weight % in terms of AlOof Al, and an accessory constituent ceramic material containing, relative to 100 parts by weight of the main constituent ceramic material, about 2 parts to about 10 parts by weight in terms of MnO of Mn and about 0.1 parts to about 10 parts by weight respectively in terms of TiOand FeOof at least one selected from Ti and Fe, and substantially not includes both Cr oxide and B oxide.

Low-temperature sintering ceramic material and ceramic substrate

To provide a ceramic composition not only having little compositional variation after burning, but a high flexural strength of the sintered body, and a high Q value in a microwave band, a ceramic composition used for forming a ceramic layer of a multi-layer ceramic substrate contains 47.0 to 67.0 wt. % of SiO, 21.0 to 41.0 wt. % of BaO, and 10.0 to 18.0 wt. % of AlO, and contains as a first additive, 1.0 to 5.0 parts by weight of CeO, relative to a total of 100 parts of SiO, BaO and AlO, and as a second additive, 2.5 to 5.5 parts by weight of MnO, relative to a total of 100 parts by weight of SiO, BaO, AlOand CeO, and is substantially free of Cr. As a third additive, at least one of Zr, Ti, Zn, Nb, Mg and Fe, and as a fourth additive, a Co component and/or a V component, may be contained.

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Nagaokakyo, Japan

Machiko Motoya