Microwave dielectric ceramic material and preparation method thereof

Abstract

The invention provides a microwave dielectric ceramic material and a preparation method thereof, belonging to the technical field of electronic materials. The microwave dielectric ceramic material comprises the following components in percentage by mass: 25-35% of MgO, 60-68% of TiO2, 1-10% of CaO, 0-2% of SiO2, 0-2% of MnO2, 0-2% of Nb2O5 and 0-2% of CeO2; the microwave dielectric ceramic material is prepared by proportioning the MgO, TiO2, CaO, SiO2, MnO2, Nb2O5 and CeO2 according to the mass percentage of each component; performing ball milling and mixing; pre-calcining a mixture at a temperature in a range of 1050-1200 DEG C and sintering the mixture at the temperature in a range of 1250-1360 DEG C. In the invention, the microwave dielectric ceramic material is prepared by utilizing atraditional solid-phase sintering method, the process is simple and the cost is low; according to the prepared microwave dielectric ceramic material, the Q*f value is in a range of 63,000-83,000 GHz,the relative dielectric constant epsilon r is in a range of 20-22, and the temperature coefficient of resonance frequency is within +/-10 ppm/DEG C, so that the preparation requirements of a high-performance microwave device can be met.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to microwave dielectric ceramics and a preparation method thereof. Background technique [0002] In recent years, modern communication technologies such as mobile communication, satellite communication, global satellite positioning, Bluetooth, and wireless local area network have developed rapidly. The microwave circuits used in these communication devices are generally composed of resonators, filters, oscillators, attenuators, dielectric antennas, microwave integrated circuit substrates and other components. Microwave dielectric ceramics are the key basic materials for the preparation of corresponding advanced electronic components. For example, with the rapid development of mobile communication and satellite communication technology, traditional metal cavity resonators can no longer meet the application requirements, and the market demand for microwave die...

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Problems solved by technology

However, the process is relatively complicated, and often requires the synthesis of MgTiO alone. 3 , CaTiO 3 , ZnNb 2 o 6 And other materials, and because its raw materials need to be synthesized many times, it is easy to cause fluctuations in the performance of dielectric materials

[0008] For MgO-TiO 2 The research work on the modification of series ceramics has never stopped, such as the 2009 article "Using (Mg 1-x mn x ) 2 TiO 4 (x=0.02-0.1) Low-Loss Microwave Dielectric Ceramics Using (Mg 1-x mn x ) 2 TiO 4 (x=0.02-0.1)Solid Solution) reported using (Mg 1-x mn x ) 2 TiO 4 The solid solution can obtain a low-loss microwave medium with a Q×f value of 270,000 GHz, but its dielectric constant is about 15.6, and the temperature coefficient of resonance frequency is -50ppm / ℃, which cannot meet the requirements of microwave devices for dielectric constant and temperature coefficient of resonance frequency

"Materials Science and Engineering: B" (Materials Science and Engineering: B) 2007 article "Preparation of Ca-doped MgTiO by reaction sintering method 3 -MgTi 2 o 5 Ceramics (Calcium-doped MgTiO 3 -MgTi 2 o 5 Ceramics prepared using a reaction-sintering process) reported that the dielectric constant of magnesium titanate ceramics fired at 1300°C / 2h was 22.4, and the temperature coefficient of resonance frequency was -9.6ppm / °C, but its Q×f value was about 40,000 , unable to meet the requirements of low insertion loss microwave devices

Our 2009 article in the Journal of Alloys and Compounds, "MgTiO 3 Powder synthesis and ZnNb 2 o 6 to MgTiO 3 The influence of the performance of base ceramics" (Preparation of pure MgTiO 3 powders and the effect of the ZnNb 2 o 6 -dope onto the property of MgTiO 3 -based ceramics) pointed out that using a separate synthesis of MgTiO 3 and doped with ZnNb 2 o 6 and CaTiO 3 method, can prepare high-performance MgTiO 3 Ceramic (ε r =22.5, Q×f=93561GHz,τ f =6.2ppm / ℃), but its process is complicated, it is not easy to produce and realize, and its performance is unstable

Applied Physics Letters 2005 article "The (Mg 1-(x+y) Ca x La y )(Ti 1-y Al y )O 3 Ceramics" (Improved microwave dielectric properties of (Mg 1-(x+y) Ca x La y )(Ti 1-y Al y )O 3 Ceramics) adopts a single synthesis technology that is easy to implement in industry to prepare this series of ceramics, and x can be adjusted to make the dielectric constant between 16 and 50, but its specific Q×f value and resonant frequency temperature coefficient have not been evaluated. , it is difficult to meet the application requirements of current microwave devices