Synthesis and characterization of LZS/α-Al_2O_3 glass-ceramic composites for applications in the LTCC technology

摘要

In this work, α-Al_2O_3, (1-40 vol%) particles (350 nm) were added to a 19.58Li_2O-11.10ZrO_2-69.32SiO_2 (5 μm) glass-ceramic matrix to prepare composites with the purpose of studying the influence of α-Al_2O_3 on their mechanical, thermal and electrical properties in order to obtain materials for LTCCs applications. The composites, sintered between 800 and 950 °C for 30 min, with relative densities between 85% and 93%, showed zircon and p-spodumene as main crystalline phases. The maximum bending strength (290 MPa) was achieved for composites with 1% α-Al_2O_3. For composites containing between 1% and 10% α-Al_2O_3, sintered at 900 °C/30 min, the electrical and thermal conductivities and CTE varied between 3.35 and 1.21 × 10~(-10)S/cm, 4.65 and 2.98 W/mK, 9.54 and 3.36 × 10~(-6) °C~(-1), respectively.