Low temperature synthesis method of non-agglomerated fully stable cubic phase nano-zirconia powder

Abstract

The invention discloses a low-temperature synthesis method of non-agglomeration fully stabilized cubic-phase nano-grade zirconium oxide powder. According to the invention, a stabilizing agent is first dissolved by using concentrated nitric acid, such that a stable transparent solution is obtained; simultaneously, soluble zirconium salt is dissolved by using distilled water, such that a stable transparent solution is formed; the two solutions are mixed according to a molar ratio of stabilizing agent cations to Zr<4+> of 3:97 to 10:90; the pH value is regulated to approximately 7 by using ammonia water; a slight excess of precipitant is added, such that uniform and stable mixed precipitation which is a precursor is obtained; the precursor is dried and grinded, and is prepared for later use; the precursor is mixed with molten salt according to a certain mass ratio, and the mixture is dried; the mixture is calcined in a ceramic crucible; the temperature is maintained for approximately 1h, and a product is obtained; the obtained product is repeatedly washed by using distilled water, and is dried, such that the non-agglomeration total-stable cubic-phase nano-grade zirconium oxide powder with a particle size of 5-50nm is obtained. The method provided by the invention has the advantages of simple process, low energy consumption, and no pollution. The product has the advantages of small particle size, narrow particle size distribution, good dispersibility, and good stability.

Description

technical field [0001] The invention relates to a low-temperature synthesis method of non-agglomerated fully stable cubic-phase nano-zirconia powder. Background technique [0002] Currently, ZrO 2 The preparation methods of powder are mainly electric melting method and chemical method. Electrofusion ZrO 2 It is based on the principle of carbonization reduction of zircon sand to remove silicon, by controlling the amount of carbon and catalyst and using a one-step electric arc furnace to separate silicon from zircon sand at high temperature. The process is simple, the process is short, and the product cost is relatively low. But the process also has some notable problems. On the one hand, due to the wide range of sources of zircon sand raw materials used in the electrofusion method, there are great differences in mineral composition, structure, and impurity types. Some of the impurities, such as Al 2 o 3 、TiO 2 , Fe 2 o 3 It is difficult to remove impurities such as i...

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Problems solved by technology

However, in the production of ZrO by chemical method 2 On the one hand, due to the high temperature calcination process usually required to obtain ZrO 2 powder, thus inevitably lead to ZrO 2 The particle size increases and hard agglomeration occurs; on the other hand, although the particle size increase and hard agglomeration defects caused by calcination can be improved by ball milling the product, this process not only easily introduces other impurities, but also makes the final product The particle size distribution is widened, which reduces product performance; in addition, the chemical method has a long process flow, a large consumption of decomposition reagents, and high product costs, so it cannot be widely used in the fields of ordinary ceramics, refractory materials, and ceramic color glazes.

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