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Journal of Ceramic Science and Technology 2/2024

Vol. 15, No. 2 · October 2024

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Comparison of Sintering Behavior of Silver, Aluminum and Copper Thick Films on Alumina Substrates using a Screen-Printing Method

J. Fang, J. Fang, T. Chen, T. Chen, Y. Jiao, Y. Jiao, Z. Zhang, S. Dong, Z. Huang

Pages 79-88 · DOI: 10.4416/JCST2024-00007

Metal circuits prepared using the screen-printing method demonstrate excellent electrical conductivity and mechanical properties, making them well-suited for applications in flexible electronics, Si-solar cells, multilayer resistors, and microelectronic packaging. The objective of this study is to conduct a comparative analysis of the sintering behavior of thick-film circuits composed of silver, copper, and aluminum on alumina substrates. The investigation encompasses an examination of the surface and cross-sectional morphology, conductivity, and adhesion of the sintered metal circuits at vari …

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Reactive-Sintered Low-Thermal-Expansion Cordierite Ceramic with High Stiffness

Y. Guo, Y. Guo, Y. Ge, W. Liu, J. Zhao, J. Zhang, J. Zhang, S. Wang, S. Wang

Pages 69-78 · DOI: 10.4416/JCST2024-00003

Low-coefficient of thermal expansion (CTE)-cordierite ceramic is one of the key materials for integrated circuit substrates, lithography machines and space telescope mirrors. Cordierite ceramic with high stiffness was produced by means of reactive sintering combined with hot isostatic pressing (HIP) treatment. This paper investigated thoroughly the phase evolution and densification processes. The cordierite phase formed at 1 160 °C, and only the cordierite phase and a small amount of residual spinel phase were present in the ceramic above 1 300 °C. Meanwhile, the shrinkage of the sintered body …

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MgO·nGa₂O₃ (n = 0.98 – 1.2) Transparent Ceramics with Longer Infrared Cut-Off Edge

W. Tao, W. Tao, D. Han, J. Zhang, Y. Shi, S. Wang

Pages 89-98 · DOI: 10.4416/JCST2024-00009

In the pursuit of infrared transparent ceramics derived from MgGa2O4 with an extended infrared cut-off edge, transparent ceramics of magnesium gallate spinel (MgO·nGa2O3) were synthesized by means of solid-state reactive sintering, followed by hot isostatic pressing (HIP) using MgO and Ga2O3 powders as raw materials. This approach yielded novel transparent MgO·nGa2O3 (0.98 ≤ n ≤ 1.2) ceramics, exhibiting an infrared cut-off edge at approximately 7.5 μm. The impact of composition (n) on the phase formation, densification rates, and microstructure evolution was thoroughly investigated. The in-li …

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Stress and Damage Analysis of the Innovative Brazing Seams between Al₂O₃ Ceramic and Nb Metal

F. Shi, F. Shi, B. Xu, B. Xu, X. Wang

Pages 55-68 · DOI: 10.4416/JCST2024-00001

This study employs numerical analysis to investigate the influence of seam structure on the residual stress and damage state in Al2O3 ceramic/Nb metal brazed structures. A block of Al2O3 ceramic and a Nb metal plate are connected with Ag-Cu-Ti filler under high temperature. Alongside the normal seam structure, three novel seam structures are proposed, including the groove-type seam structure, the hole-type seam structure, and the surrounding-cut seam structure. The residual stresses of all four Al2O3/Nb brazed structures are simulated with the finite element method (FEM). The numerical model i …

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