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Method for synthesizing pure lanthanum chromate at low temperature, lanthanum chromate synthesized by method and application of lanthanum chromate

A pure lanthanum chromate and low temperature technology, applied in the field of lanthanum chromate, can solve the problem of undiscovered pure-phase lanthanum chromate powder material, and achieve the effect of high melting point, low thermal expansion rate and good thermal expansion coefficient

Pending Publication Date: 2021-02-09
中科立民新材料(扬州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the solid-phase method, sol-gel method, Pechini method and low-temperature combustion method are commonly used in the prior art, no relevant reports have been found so far on the low-temperature synthesis of pure-phase lanthanum chromate powder materials by the molten salt method

Method used

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  • Method for synthesizing pure lanthanum chromate at low temperature, lanthanum chromate synthesized by method and application of lanthanum chromate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a. Press LaCrO 3 The stoichiometric ratio, respectively weighed 54.379g of lanthanum oxide and 25.621g of chromium oxide, were placed in an agate mortar and mixed fully ground for 2h, to obtain a mixed powder;

[0036] b. According to the mass ratio m (NaCl) :m (KCl) =1:1.28 ratio, weigh 35.088g sodium chloride and 44.912g potassium chloride respectively, put them in an agate mortar and mix and grind them thoroughly for 2 hours to obtain mixed salt;

[0037] c. Put the mixed powder obtained in step a and the mixed salt obtained in step b in an equal mass ratio (i.e., take all the solids), place them in an agate mortar and mix and grind them thoroughly for 10 hours again to obtain a mixture;

[0038] d. Pour the mixture obtained in step c into a 300mL corundum crucible, calcinate at 600°C for 4 hours, and cool to room temperature;

[0039] e. Put the block obtained in step d into a 500mL beaker, add deionized water (the volume ratio of the block to water is about 1:2) a...

Embodiment 2

[0041] a. Press LaCrO 3 The stoichiometric ratio, respectively weighed 54.379g of lanthanum oxide and 25.621g of chromium oxide, were placed in an agate mortar and mixed fully ground for 2h, to obtain a mixed powder;

[0042] b. According to the mass ratio m (NaCl) :m (KCl) =1:1.28 ratio, weigh 35.088g sodium chloride and 44.912g potassium chloride respectively, put them in an agate mortar and mix and grind them thoroughly for 2 hours to obtain mixed salt;

[0043] c. Put the mixed powder obtained in step a and the mixed salt obtained in step b in an equal mass ratio (i.e. take all the solids), place them in an agate mortar and mix and grind again for 8 hours to obtain a mixture;

[0044] d. Pour the mixture obtained in step c into a 300 mL corundum crucible, and calcinate at 700° C. for 3 hours, and cool to room temperature.

[0045] e. Put the block obtained in step d into a 500mL beaker, add deionized water (the volume ratio of the block to water is about 1:2) and raise ...

Embodiment 3

[0047] a. Press LaCrO 3 The stoichiometric ratio, respectively weighed 54.379g of lanthanum oxide and 25.621g of chromium oxide, were placed in an agate mortar and mixed fully ground for 2h, to obtain a mixed powder;

[0048] b. According to the mass ratio m (NaCl) :m (KCl) =1:1.28 ratio, weigh 35.088g sodium chloride and 44.912g potassium chloride respectively, put them in an agate mortar and mix and grind them thoroughly for 2 hours to obtain mixed salt;

[0049] c. Put the mixed powder obtained in step a and the mixed salt obtained in step b in an equal mass ratio (i.e., take all the solids), place them in an agate mortar and mix and grind again for 6 hours to obtain a mixture;

[0050] d. Pour the mixture obtained in step c into a 300 mL corundum crucible, and calcinate at 800° C. for 3 hours, and cool to room temperature.

[0051] e. Put the block obtained in step d into a 500mL beaker, add deionized water (the volume ratio of the block to water is about 1:2) and raise...

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Abstract

The invention discloses a method for synthesizing pure lanthanum chromate at a low temperature, lanthanum chromate synthesized by the method and application of the lanthanum chromate. The method comprises the following steps: weighing lanthanum oxide and chromic oxide, and mixing and grinding lanthanum oxide and chromic oxide to obtain mixed powder; weighing sodium chloride and potassium chloride,mixing and grinding sodium chloride and potassium chloride to obtain mixed salt; subjecting the obtained mixed powder and mixed salt to mixing and grinding again so as to obtain a mixture; calciningthe mixture at a high temperature, and cooling the mixture to room temperature; and adding deionized water into an obtained block, raising a temperature, carrying out continuous heating and stirring,and tehen successively carrying out suction filtration, washing and drying to obtain a pure lanthanum chromate powder material. The synthesis method disclosed by the invention is low in synthesis temperature, simple in process, short in period, friendly to environment and low in energy consumption; a synthesis temperature can be adjusted through different types of fused salt; and obtained powder is good in crystallinity and high in purity. The LaCrO3 powder obtained by the method can be used for processing battery materials, high-temperature thermal barrier coating materials and high-temperature thermal-sensitive ceramic materials.

Description

technical field [0001] The invention belongs to lanthanum chromate materials, in particular to a method for synthesizing pure lanthanum chromate powder materials at low temperature, and the synthesized lanthanum chromate and its application. Background technique [0002] Due to its high melting point, high electrical conductivity and good chemical stability, lanthanum chromate has been widely used in high-temperature heating materials, solid oxide fuel cells, high-temperature thermal barrier coating materials and high-temperature NTC thermosensitive ceramic materials. . However, during the synthesis of lanthanum chromate powder, when the synthesis temperature is higher than 1000 °C, chromium is easy to volatilize, and the volatilization becomes more and more serious as the temperature increases, resulting in a mismatch between the stoichiometric ratio of lanthanum chromate and the design, which hinders its application in high temperature field. Especially for the synthesis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/14
CPCC01G37/14C01P2002/72
Inventor 倪立李明亚周洋陈霞
Owner 中科立民新材料(扬州)有限公司
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