Low-temperature sintering available microwave dielectric ceramic TiP2O7 with ultralow dielectric constant and preparation method thereof

Abstract

The invention discloses an application of a composite oxide TiP2O7 in serving as low-temperature sintering available microwave dielectric ceramic with ultralow dielectric constant. The method comprises the following steps: (1) weighing and blending original powder, having the purity of over 99.9 percent, of TiO2 and NH4H2PO4 according to a chemical formula of TiP2O7; (2) carrying out wet ball-milling and mixing on the raw materials in the step (1) for 12 hours with ethanol serving as a ball-milling medium, baking, and pre-sintering for 6 hours in the atmosphere at 750 DEG C; and (3) adding adhesive into the powder prepared in the step (2), granulating, pressing to mold, and finally sintering for 4 hours in the atmosphere at 810-830 DEG C, wherein the adhesive is a 5% polyvinyl alcohol solution, and accounts for 3 percent of the total mass of the powder. According the ceramic prepared by the method, the sintering at 810-830 DEGC is excellent, the quality factor Qf value is up to 100,000-127,000GHz when the dielectric constant is 10-11, the temperature coefficient of resonance frequency is small, and the microwave dielectric ceramic has a great application value in industry.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric substrate, a resonator, a filter and other microwave components used at microwave frequencies, as well as a dielectric ceramic material for a ceramic capacitor or a temperature compensation capacitor and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in circuits in the microwave frequency band (mainly UHF and SHF bands) and perform one or more functions. They are widely used as resonators, filters, and dielectric substrates in modern communications. Components such as chips and dielectric waveguide circuits are the key basic materials of modern communication technology. They have been used in portable mobile phones, car phones, cordless phones, TV satellite receivers and military radars. They are used in modern communication tools. It is playing an increasingly important...

AI Technical Summary

Problems solved by technology

[0010] In the process of exploring and developing new low-firing microwave dielectric ceramic materials, material systems such as Li-based compounds, Bi-based compounds, tungstate compounds, and tellurate-based compounds with inherently low sintering temperatures have received extensive attention and research. A large number of exploratory studies have focused on Li-based binary or ternary compounds, and developed such as Li 2 TiO 3 , Li 2 MoO 4 and Li 2 MTi 3 o 8 (M=Mg or Zn) series of microwave dielectric ceramics with good performance, etc., but the low-firing ultra-low dielectric constant microwave dielectric ceramic system is still relatively limited, which largely limits the low-temperature co-firing technology and microwave multilayer device development

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