Novel method for preparing zirconium tungstate powder

Abstract

The invention relates to a novel method for preparing zirconium tungstate powder, which is characterized by comprising the following process steps of: weighing in a stoichiometric ratio of ZrO2 to WO3 of 1:2, putting the ZrO2 and WO3 into a resin ball mill, adding absolute ethanol serving as a solvent, performing ball milling in a ball mill for 8 hours, standing for sedimentation, removing an upper-layer clear solvent, drying in an oven, putting powder into a quartz crucible, heating at 600DEG C for 4 hours, taking out, and cooling in the air; grinding for 40 minutes; regulating the temperature to be 800DEG C, heating for 8 hours, cooling together with a furnace, taking out, and grinding for 40 minutes; heating at 900DEG C for 12 hours, cooling together with a furnace, taking out, and grinding for 40 minutes; and putting ZrO2 and WO3 mixed powder into a mold with the diameter of 60mm, pressing under the pressure of 125MPa into a round sheet, and keeping the temperature of 1,220DEG C for 3 hours. Compared with the prior art, the novel method has the advantages that: the grain size is 0.5-1mu m, the purity is high, and the average coefficient of linear expansion is -5.33*10<-6>/K in a section of 20-700DEG C.

Description

technical field [0001] The invention relates to a novel method for preparing zirconium tungstate powder. Background technique [0002] Currently, ZrW 2 o 8 The production methods of the powder are as follows: oxide direct synthesis method, ZrO 2 and WO 3 Mix according to appropriate proportions, ball mill in a planetary ball mill for 24 hours, place in a sealed platinum kumquat pot and sinter at 1200°C for more than 48 hours, and then quench to obtain ZrW 2 o 8 Powder, the solid state method has a high sintering temperature and takes a long time, and because WO 3 The volatility is strong, usually get ZrW 2 o 8 and WO 3 mixture. Therefore, a single ZrW was synthesized by a solid-phase method 2 o 8 Very difficult. Combustion synthesis method, combustion synthesis method to synthesize ZrW 2 o 8 , the reaction speed is relatively fast, but the product is impure, and harmful nitrogen oxides are released during the reaction process, causing environmental pollution an...

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Problems solved by technology

Therefore, a single ZrW was synthesized by a solid-phase method 2 o 8 Very difficult

Combustion synthesis method, combustion synthesis method to synthesize ZrW 2 o 8 , the reaction speed is relatively fast, but the product is impure, and harmful nitrogen oxides are released during the reaction process, causing environmental pollution and not suitable for industrial applications

Low temperature synthesis method, low temperature synthesis method refers to low temperature synthesis of ZrW 2 o 8 Although this method avoids high-temperature sintering, its steps are cumbersome, the process conditions are harsh, and its synthesis time is long, so it is not suitable for industrial mass production

Wet chemistry combined with microwave calcination synthesis method, wet chemistry method combined with microwave calcination process to synthesize ZrW 2 o 8 , the reaction time was shortened, but the temperature of the synthesis reaction was only reduced to a certain extent

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