A kind of preparation method of fused barium zirconate

Abstract

The invention discloses a method for preparing electric fused barium zirconate, which comprises the following steps: Step 1: Putting any one of powdery monoclinic zirconia and barium oxide or barium carbonate into the mixed material In the machine, mix evenly to make a mixed material; Step 2: put the mixed material into the arc for melting and refining, the melting and refining temperature is 2600-3000 °C, and the mixed material is fully melted into a molten state; Step 3: Melt the molten state The final mixed material is naturally cooled to below 50°C to form an off-white solid product; step 4: smash the off-white solid product, check and select, and form barium zirconate powder after crushing. The present invention obtains all the barium zirconate phase powders through the electric melting method, has low porosity, high bulk density, can be processed into particles and fine powders of various particle size levels, and has good high temperature volume stability, etc., and solves the problem of the prepared zirconium The purity of the barium acid powder is not high, and it contains the problem of unreacted barium carbonate phase.

Description

technical field [0001] The invention relates to the field of preparation methods of special refractory materials, in particular to a preparation method of fused barium zirconate. Background technique [0002] Barium zirconate (BaZrO 3 ) is an inorganic material with a cubic perovskite structure, with a lattice constant of 0.4913nm. Among all perovskites, barium zirconate has the largest lattice constant; the coefficient of thermal expansion is very small, between 20°C and 1080°C, The coefficient of thermal expansion is only 7.72×10 -6 / °C; thermal conductivity is low, melting point is as high as 2600°C, and phase change is not easy to occur. It has good mechanical and structural stability in extreme thermal environments and harsh environments. At the same time, barium zirconate also has very high chemical stability and thermal shock. and good thermal shock resistance. Barium zirconate is not only the preferred choice for high-temperature proton conductor materials, but al...

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Problems solved by technology

Barium zirconate powder prepared by hydrothermal method can be seen from the XRD analysis that there are obvious barium carbonate diffraction peaks, indicating that the prepared powder is not high in purity and contains unreacted barium carbonate phase

[0004] Barium zirconate powder is synthesized by solid phase method, and the publication number is CN201110350464, which is used for titanium alloy smelting barium zirconate refractory material and its preparation method for crucible. The molar ratio of coordination is BaCO 3 : ZrO 2 =1:1; in addition, add 0.5~5.0mol% TiO 2 ; This batch material is repeatedly sintered at a temperature of 1200-1400 ° C to make a barium zirconate refractory ", and then add 0.5-5.0 mol% of TiO 2 It is bound to produce barium titanate and zirconium titanate and undecomposed barium carbonate, and the purity of barium zirconate produced by this method is not high

[0005] At present, the barium zirconate powder prepared by hydrothermal method and solid phase method, the content of barium zirconate is less than 100% by XRD analysis, and there are obvious barium carbonate diffraction peaks, indicating that the purity of the prepared powder is not high

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