Preparation and Properties of Alumina Fiber Reinforced LTCC Ceramic Coatings

Abstract Low temperature co-fired ceramic technology (LTCC) uses multi-layer laminated firing process to realize the high density packaging of complex circuits and passive devices, which provides a new solution for the miniaturization and high integration of passive devices, and plays an important role in national defense, communication and other fields. As the bearing structure of the functional circuit, LTCC substrate plays the dual role of structural support and electrical shielding, which is the key to the development of LTCC technology. In this study, the CaO-MgO-B 2 O 3 -SiO 2 (CMBS) system, identified for its significant developmental prospects, is chosen as the subject of investigation and the influence of Al 2 O 3 fiber reinforcement on the mechanical and dielectric properties of LTCC substrate materials is studied. The results show that the substrate can stably co-sinter with Ag. With the increase in Al 2 O 3 ceramic fiber content, both the elastic modulus and microhardness of the substrate increase overall. The dielectric constant ranges from 4 to 4.65, exhibiting an initial increase followed by a decrease with the addition of Al 2 O 3 ceramic fibers, conforming to the requirements of low dielectric constant and low dielectric loss, meeting the requirements of low dielectric constant and low dielectric loss.