Study On The Preparation Of Batio₃ Ptcr Ceramics With Low Room Temperature Resistivity

Recent years, BaTiO₃PTCR ceramics with low resistivity is widely used in over-current overload protection circuit,chip components and spaceflights.Reducing the resistivity of PTCR material is important because it can expand the scope of application of PTCR material,the sudy of BaTiO₃PTCR ceramics with low resistivity is important.In this paper,the existing questions on the studying of BaTiO₃PTCR ceramics with low resistivity were proposed,according to the reviewing of the conditions of preparation and the development of theory of it .Through a large amount of experiments,we studied the methods of preparation of low resistivity BaTiO₃PTCR ceramics.This article mainly covers the the design of BaTiO₃PTCR ceramics with low resistivity, the design of preparation,the test of the material and the analysis of the test results. In the design of BaTiO₃PTCR material with low-resistivity, this paper expound the mechanism of BaTiO₃PTCR becaming semiconducting materials, as well as the role of the element doped into the material, including its influence on the material resistivity, grain size and PTC effect.After sintering, the resistivity of the material ,the relation between resistance and temperature and the surface morphology of samples are tested .After analysing the testing results ,we find the relationgship between the resistivity of the material and the donor-doped ,the co-donor-doped and the sintering aids doped into the material .Based on the relationship,we get a curve used for designing the material .In the producing process,through regulation of sintering temperature ,we study the influence of the sintering temperature and find a fitting sintering temperatureFinally, by generalizing the work that before, the further question which also will wait for to solve has been taken out to analyze.