Dielectric adjustable material of ceramics burned together at low temperature, and preparation method

Abstract

This invention relates to a method for preparing ceramic material with a sintering temperature below 950 deg.C. The ceramic material is composed of Ba1-xSrxTiO3 (x = 0.2 -0.6) 75.0-95.0 wt. %, MgO 0.15-15 wt. %, B2O3 0-1.0 wt. %, Li2CO3 3.0-10.0 wt. %. The method utilizes MgO and B2O3-Li2O sintering aid to dope and modify BST ceramic material, and the obtained ceramic material has such advantages as adjustable dielectric constant (100-2000) and low sintering temperature (850-950 deg.C). The ceramic material can be used in LTCC technique and microwave adjustable devices.

Description

technical field [0001] The invention belongs to the technical field of electronic materials and devices, and in particular relates to a ceramic material with a sintering temperature below 950°C and a preparation method thereof. Background technique [0002] The rapid development of information technology urgently requires high-speed data and high current density transmission, and electronic circuits are increasingly developing in the direction of miniaturization, integration, and high frequency. This puts forward requirements for electronic components with small size, high frequency, high reliability, Low cost and high integration requirements. Low-temperature co-fired ceramics (LTCC) technology is to integrate components and circuits onto a multilayer ceramic substrate by printing, and then sinter at a low temperature to make the components stably embedded in the substrate structure, thereby achieving high component integration and product miniaturization. Purpose. [000...

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Problems solved by technology

Literature "T.Hu, H.Jantunen, A.Uusimaki, et al..Ba 0.7 Sr 0.3 TiO 3 Powders with B 2 o 3 Additive Prepared by the Sol-Gel Method for Use as Microwave Material.Mater.Sci.Semiconduct.Process., 2002, 5(2-3): 215-221 "Ba obtained by the sol-gel method 0.7 Sr 0.3 TiO 3 Ultrafine powder, also by adding B 2 o 3 and Li 2 O burning aid, Ba 0.7 Sr 0.3 TiO 3 The ceramic sintering temperature can also be reduced to 900C. At room temperature, the dielectric constant obtained at 1kHz test frequency is 4290, and the loss reaches 0.005, but the adjustability has not been reported, and the BST powder is obtained by using the sol-gel process. relatively high cost

Literature "Cheng Huarong, Zhu Jingchuan, Quan Zaihao et al. The effect of sintering process on B 2 o 3 Doping Ba 1-x Sr x TiO 3 The effect of gradient ceramic dielectric properties. Journal of Inorganic Materials, 2005, 20(5): 1145-1152 "reported proper doping of B in BST 2 o 3 Compared with undoped BST ceramics with the same composition, the sintering temperature is 150°C lower, but the dielectric properties are poorer, B 2 o 3 Doping 0.5wt%, the loss reaches 0.095 at room temperature

These single through the addition of B203 and Li02 sintering aids reduce the sintering temperature of BST ceramics, but the dielectric constant remains high, above 2000, so it is difficult to meet the spatial impedance matching requirements of microwave devices

[0012] At present, BST ceramic materials with suitable dielectric constant and low temperature sintering, which are suitable for LTCC technology and microwave tunable devices, have not been reported yet.

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