Method for preparing Ba1-xSrxTiO3-MgO ferroelectric ceramic blank

Abstract

The invention discloses a method for preparing a Ba1-xSrxTiO3-MgO ferroelectric ceramic blank, and belongs to the field of inorganic nonmetallic materials. The method comprises the following steps of: preparing materials; preparing premix solution; mixing the materials and the premix solution and performing ball-milling; degassing and adding a catalyst into the mixture; adding initiator into the mixture; performing gel-casting; and demolding and drying. In the method, the Ba1-xSrxTiO3-MgO ferroelectric ceramic blank is prepared by adopting a semi-aqueous gel-casting process which uses deionized water and alcohol organic matters which are soluble with water as solvents, so that the problems that in the conventional dry press method, the ceramic blank with complex shapes and large sizes cannot be prepared, and particularly uniformity inside ceramic parts cannot be ensured are overcome. Meanwhile, the Ba1-xSrxTiO3-MgO ferroelectric ceramic blank prepared by the method has high strength and high plasticity, can be subjected to subsequent processing of machining, isostatic pressing and the like, contributes to preparing ceramics with complex shapes and high compactness, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a method for preparing Ba 1-x Sr x TiO 3 - A method for MgO (abbreviated as BSTM) ferroelectric ceramic body, wherein 0.2≤x≤0.8. Background technique [0002] Ferroelectric ceramic materials are currently a hot spot in the field of ceramic materials. Ferroelectric materials have the nonlinear characteristic that the relative permittivity changes with the applied electric field. This adjustable characteristic can be applied in microwave circuits. The equivalent permittivity of the circuit can be changed by the applied electric field, thereby controlling the wave velocity and wavelength of electromagnetic waves. In order to achieve the change of phase shift. At present, the use of BSTM ferroelectric materials to make devices such as phase shifters has received widespread attention at home and abroad. At the same time, it is well known that electronic material mo...

AI Technical Summary

Problems solved by technology

However, when deionized water is used as solvent, it is difficult to prepare BSTM slurry with high solid phase content and low viscosity. The reason is that because BSTM contains a large amount of MgO, MgO is more active and easier to react with water , so it is more difficult to make pulp with water as solvent

However, if the non-water-based gel injection molding process is used to prepare the BSTM ferroelectric ceramic body, since organic matter is used as a solvent, this will inevitably increase the manufacturing cost and easily cause pollution

At the same time, due to the high viscosity of organic solvents, it is difficult to prepare a slurry with high solid content and good fluidity