65 results about "Calcium copper titanate" patented technology

The invention discloses a preparation method of polyimide / CCTO@Ag nanoparticle composite material with high dielectric and low loss. According to the method, polyimide is used as matrix, the prepared CCTO@Ag nanoparticles are ultrasonically dispersed in absolute ethyl alcohol, then is blended with polyimide monomer in solvent, then in situ polymerization reaction is carried out on the monomer at room temperature to simultaneously realize copolymerization of polyimide and intercalation recombination with the CCTO@Ag nanoparticles, obtained stock solution is subjected to gradient annealing according to a coating method to finally obtain the polyimide / CCTO@Ag nanoparticle composite film. Compared with pure polyimide, the polyimide / CCTO@Ag nanoparticle composite material prepared according to the preparation method has the dielectric constant (103) increased by 30 times, also has low dielectric loss (0.006) and can be widely applied in fields of high energy storage capacitors, artificial organs, high speed integrated circuits, and the like.

The invention relates to a method for preparing a nano CaCu3Ti4O12 ceramic material with a giant dielectric constant. The method comprises the steps of dissolving Cu(NO3)2.3H2O and Ca(NO3)2.4H2O in absolute ethyl alcohol to prepare a solution A; dissolving butyl titanate into absolute ethyl alcohol to prepare a solution B; mixing glycol, citric acid, lithium carbonate and an oxalic acid aqueous solution to prepare a solution C; dripping the solution B in the solution A and stirring, and controlling the reaction temperature to be 80 to 95 DEG C and the pH (Potential Of Hydrogen) value to be 5.0 to 6.0; then dripping the solution C into the obtained mixed solution of the solution A and the solution B, and controlling the pH value to be 3.0 to 4.0 and the temperature to be 75 to 85 DEG C; obtaining nano CaCu3Ti4O12 by carrying out aftertreatment and calcination on an obtained product, wherein the calcination temperature is 700 to 850 DEG C. According to the method for preparing the nano CaCu3Ti4O12 ceramic material, disclosed by the invention, the nano CaCu3Ti4O12 which is uniform in particle size distribution, high in chemical activity and easy to modify and dope and has a very high dielectric constant and very low dielectric loss is prepared, the reaction period is greatly shortened, the firing temperature is low, and the energy consumption is low.

The invention discloses a precursor water solution for preparing calcium copper titanate and a preparation method thereof. The preparation method comprises: alkaline calcium salt, alkaline cupric salt, alkoxyl titanium and citric acid water solution are provided, and the ratio between the mol sum of calcium, copper and titanium atoms and the mole number of critic acid radical is more than 0 and less than or equal to 1-5; the alkaline calcium salt, the alkaline cupric salt and the alkoxyl titanium are directly added into the citric acid water solution, and the mixed solution is continuously stirred in the adding process to ensure undissolved substance to be dissolved in time, so that clear solution which is the precursor water solution is obtained. The method has simple preparation technique, and the raw materials are simple and easily obtained, so that the cost is low, and industrialization is easy to realize. After the processes such as preburning decomposition, calcination and the like, the precursor water solution can be used for preparing calcium copper titanate powder with regular granule appearance, and the dielectric constant of the calcium copper titanate powder reaches 4*10.