Preparation Of Lead-based Titanate Ceramic Fibers By Sol-Gel Method

Electronic ceramics is a kind of important inorganic material because of its excellent ferroelectric and dielectric properties.With the development of the advanced composite materials, function ceramic fibers have been widely applied in the past few years. Sol-gel process is especially suitable for preparing the functional ceramic fibers which is very difficult or even could not be obtained by conventional melting method.The sol-gel technique is a wonderful method in material science. It possesses many advantages, such as low processing temperature,high homogeneity,purity of products, and so on. The sol-gel synthesis of titanate ceramic fibers have been investigated in this paper. The products were characterized by FT-IR,XRD,SEM,TGA-DTA and other techniques.The main content in this paper includes:1.The synthesization of stable solIn order to synthesize the ceramic fibers with high-performance, the preparation of the stable sol is very imporant step. Based on many lieratures, the influences of different solvent,water,catalyst,the extent of superfluoud lead,chelating agents and concentration on the stabilization of sol,microstructure and morphology of the fibers have been studied respectively. According to FT-IR,XRD,SEM,TGA-DTA, we get the optimum condition here.2.The preparation and characterization of PbTiO3 ceramic fibersAccording to the optimum condition which we have chosen to synthesize the PbTiO3 gel fibers. Depend on the FT-IR,TGA-DTA,XRD,SEM, we study the influences of annealing temperature,time and heating rate on the morphology and microstructure of the fibers. Heat treatment process of gel fibers was confirmed and lead titanate ceramic fibers with the smooth and compact surface were obtained.3.The preparation and characterization of alkaline-earth metals doping lead titanate ceramic fibersA series alkaline-earth metals (Ca,Sr,Mg) doped lead titanate ceramic fibers were prepared by sol-gel method. We investigated the effect of alkaline-earth metals doping on the microstructure unit cell parameters,grain-size and morphology of lead titanate fibers. According to the experiment, we found that alkaline-earth metals could change the microstructure,unit cell parameters and morphology.