Improving bending strength of LTCC materials with low dielectric loss by structural design
Tóm tắt
The flake alumina filler is added to improve the bending strength in BaZrO3 (BZ)/BaO-MgO-ZnO-SiO2-B2O3 (BBSMZ) glass for the application of low temperature co-fired ceramics. The effects of flake alumina filler for BaZrO3/BaO-MgO-ZnO-SiO2-B2O3 on phase, microstructure, dielectric and mechanical property are studied. With the increase of flake Al2O3 content, flake Al2O3 phase appears, BaZrO3, BaZr(BO3)2, BaZn2Si2O7 phase decreases, dielectric constant decreases and dielectric loss increases. By adding flake Al2O3, the mechanical strength of the material increases. Under the same sintering conditions, the bending strength (205 MPa) of the laminated sample increased by nearly 60% compared with the same content flake alumina block sample (124 MPa), and increased by 162% compared with the sample without flake alumina (78 MPa). BZ-BBSMZ-5 wt% flake Al2O3 ceramic sintered satisfactorily at 940 °C with tanδ = 4.82*10–4 (10 GHz), εr = 11.66. The bending strength of the sample is 205 Mpa.
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