National Research Tomsk Polytechnic University, Tomsk, Russia:

D. A. Pashkov, Post-Graduate Student of Engineering School of New Production Technologies, e-mail: pashk@tpu.ru
V. M. Pogrebenkov, Professor of N. M. Kizhner Scientific and Education Center

We used the method of liquid-phase sintering at a low-temperature range of 850–900 ^оC to obtain composite materials in the system Ba – Pb – Al – B – Si – O glass/-Al₂O₃ with 20–60% (wt.) of aluminium oxide. The glass was made by fritting from melt at the temperature of 1430 ^оC with subsequent grinding on a planetary mill (particle size: 3, 5 and 8 microns). After the sintering, glass ceramic characteristics are determined by hydrostatic weighting with vacuumization. The influence of fraction composition of glass in phase composition of sintered compositions was studied by using X-ray phase analysis. A new phase — celsian — is crystallized at roasting temperatures of 850–900 ^оC in the compositions with 20–60% (wt.) of α-Al₂O₃. Sintering of samples and dissolution of corundum particles is intensified by decreasing the size of glass particles from 8 to 3 microns in compositions. Celsian is crystallized more intensively in the compositions with larger glass fractions (5 and 8 microns). The composition with the best characteristics has 70% (wt.) of glass (particle size 5 microns; 30% (wt.) of α-Al₂O₃) sintered at 850 ^оC for 30 minutes. At the same time, the apparent density is 2.87·10³ kg/m³; water absorption is 0.01%; and shrinkage is 9.86%. LTCC materials, obtained through usage of glass with large particles (5 microns), are less inclined to glass phase in metallization layers at co-sintering with noble metal powders in metallized pastes.

Our investigation was carried out with the support of the Funds of assistance of development of small enterprises in scientific and engineering sphere according to the “UMNIK” program within the agreement No. 9939ГУ/2015 (16.03.2016).

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