Constrained Sintering of the Sandwich Substrate with Inner-constraining Fine Particles Layer

Nakao, Shuya; Kojima, Masaru; Tanaka, Kenji

doi:10.4164/sptj.41.350

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…Namely, during the sintering process, the molten glass penetrates into the pores among the particles in the ceramic particle layer to form a low-porosity compound solid member consisting of glass and ceramic. The authors have proven that this method, combined with inhibition of LTCC substrates' sintering shrinkage, can improve the bending strength of LTCC substrates 9,10) .…”

Section: Introductionmentioning

confidence: 99%

The Influence of Particle Characterizations of Inner-Constraining Layer upon Constrained Sintering Shrinkage [Translated]<sup>†</sup>

Nakao

Kojima

Tanaka

2005

KONA

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Constrained sintering of a substrate with a sandwich structure, which was the laminated innerconstraining alumina layer between the glass-alumina mixed layers, has been studied. The inf luence of specific surface area of the particles and porosity of inner constraining particle layer upon sintering shrinkage was investigated. Specific surface area of the alumina powder for the inner constraining particle layer could be changed by grinding and blending two different particle size powders. As for the debinded sheet used with ground alumina powder, the pore distribution was sharp, and the bending strength was proportional to the specific surface area. In the case of inner constraining particle layer used with ground alumina powder, penetration length of molten glass from glass-alumina mixed layers obeyed Kozeney-Carman's equation. On the other hand, as for the debinded sheet with particle size blended powder, the effects of specific surface area on the bending strength and the penetration length of molten glass differed from the results of the grounded one. Sintering shrinkage in X-Y direction of the sandwich substrate was basically related to the bending strength of debinded alumina powder sheet for inner constraining particle layer in both cases.

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Section: Introductionmentioning

confidence: 99%

The Influence of Particle Characterizations of Inner-Constraining Layer upon Constrained Sintering Shrinkage [Translated]<sup>†</sup>

Nakao

Kojima

Tanaka

2005

KONA

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“…[1][2][3][4][5] LTCCs are used as a small passive component that is co-firable with a wiring conductor with a high conductivity, such as Cu, Ag, or Au, by lowering the sintering temperature of the ceramic used as the insulating layer. [6][7][8][9][10][11][12][13][14][15][16] LTCCs have a very small dielectric loss, which affects the high-frequency properties, when compared with organic resin generally used as insulating materials in electronic circuits. 17) Therefore, LTCCs are suitable materials for constructing filters.…”

Section: Introductionmentioning

confidence: 99%

Novel Low Temperature Co-Fired Ceramic Material System Composed of Dielectrics with Different Dielectric Constants

Sakamoto

Adachi

Kaneko

et al. 2013

Jpn. J. Appl. Phys.

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We found that the co-firing low temperature co-fired ceramic (LTCC) materials of different dielectric constants (εr) with Cu wiring is achievable using a novel, original design. It was confirmed that the dielectric characteristics of the dielectrics designed in this study are very suitable for the use of the dielectrics in electronic components such as filters mounted in high-speed radio communication equipment. The dielectric constants of the lower- and higher-dielectric-coefficient materials were 8.1 and 44.5, respectively, which are sufficiently effective for downsizing LTCC components. Observing the co-fired interface, it was confirmed that excellent co-firing conditions resulted in no mechanical defects such as delamination or cracks. On the basis of the results of wavelength dispersive X-ray spectrometry (WDX) and X-ray diffractometry (XRD), it was confirmed that co-firing with minimal interdiffusion was realized using the same glass for both dielectrics. It is concluded that the materials developed are good for co-firing in terms of the mechanical defects and interdiffusion that appear in them.

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“…There are three main processes involved in nonshrinkage (in the x – y direction) sintering technology for LTCC, 6–10 that is, self‐constrained sintering, pressureless constrained sintering, and pressure‐assisted constrained sintering. Although the conventional free sintering process is cost effective, the variation in the dimensions of the fired circuit design and its dimensional tolerances are large.…”

Section: Introductionmentioning

confidence: 99%

Development, Analysis, and Application of a Glass–Alumina‐Based Self‐Constrained Sintering Low‐Temperature Cofired Ceramic

Takada¹,

Nakao²,

Kojima³

et al. 2007

Int J Applied Ceramic Tech

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The effects of an inner constraint layer and alumina particles on the microstructure, strength, and shrinkage of the laminated low‐temperature cofired ceramic (LTCC) green sheet were investigated. Alumina particles of several sizes were used in the inner‐constraint layer in order to strengthen the LTCC substrate. Smaller alumina particles in the inner‐constraint layer produced a substrate with a high bending strength. Sintering shrinkage in the x–y direction of the LTCC is related to the bending strength of the debinded alumina particle layer used for an inner‐constraint layer. A larger pore size in the inner‐constraint layer was found to increase the distance of the glass penetration from the glass–alumina layer into the inner‐constraint layer. The total thickness of the constraint layer changes the shrinkage in the x–y direction and the bending strength.

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Constrained Sintering of the Sandwich Substrate with Inner-constraining Fine Particles Layer

Cited by 10 publications

References 4 publications

The Influence of Particle Characterizations of Inner-Constraining Layer upon Constrained Sintering Shrinkage [Translated]<sup>†</sup>

The Influence of Particle Characterizations of Inner-Constraining Layer upon Constrained Sintering Shrinkage [Translated]<sup>†</sup>

Novel Low Temperature Co-Fired Ceramic Material System Composed of Dielectrics with Different Dielectric Constants

Development, Analysis, and Application of a Glass–Alumina‐Based Self‐Constrained Sintering Low‐Temperature Cofired Ceramic

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