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High-purity and uniform-morphology lanthanum zirconate gadolinium powder and transparent ceramic preparation method

A lanthanum gadolinium zirconate, high-purity technology is applied in the field of optically functional transparent ceramic materials, which can solve the problems of product yield limitation, difficulty in mass production, atmospheric environmental pollution, etc., and achieves simple and controllable technological process and operation, and low cost. , The effect of high sintering activity

Active Publication Date: 2017-10-24
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN102815945B discloses a lanthanum-gadolinium zirconate transparent ceramic material and its preparation method, which adopts a glycine-nitrate combustion method to prepare lanthanum-gadolinium zirconate transparent ceramics, but the combustion method will cause violent chemical reactions in the combustion process of organic matter. The atmospheric environment causes pollution. In addition, the expansion during the combustion reaction is serious, resulting in a severe limitation of the product output by the volume of the container, and it is difficult to produce in batches.

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  • High-purity and uniform-morphology lanthanum zirconate gadolinium powder and transparent ceramic preparation method
  • High-purity and uniform-morphology lanthanum zirconate gadolinium powder and transparent ceramic preparation method
  • High-purity and uniform-morphology lanthanum zirconate gadolinium powder and transparent ceramic preparation method

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Embodiment 1

[0031] Embodiment 1: In this embodiment, a preparation method of a lanthanum-gadolinium zirconate powder and a transparent ceramic with high purity and uniform appearance is as follows:

[0032] (1) Gd(NO 3 ) 3 ·6H 2 O, La(NO 3 ) 3 ·6H 2 O, ZrOCl 2 ·8H 2 O was dissolved in deionized water and its cation concentration was calibrated, according to Gd 3+ , La 3+ with Zr 4+ The molar ratio of the mixture is measured at a composition ratio of 1:1:2, and is mixed with a mixed salt solution; the mixed salt solution is titrated into the ammonia precipitant solution to a pH value of 10.8 to obtain a mixed solution;

[0033] (2) After aging the mixed solution for 24 hours, carry out suction filtration, and the precipitate filtered out is first washed 3 times with deionized water, and then washed 3 times with absolute ethanol to obtain a colloidal precipitate, which is placed in In an anhydrous ethanol medium equivalent to 1 times the volume ratio of the precipitate, stir evenl...

Embodiment 2

[0040] Embodiment 2: In this embodiment, a preparation method of a lanthanum-gadolinium zirconate powder with high purity and uniform appearance and transparent ceramics thereof is as follows:

[0041] (1) Gd(NO 3 ) 3 ·6H 2 O, La(NO 3 ) 3 ·6H 2 O, ZrOCl 2 ·8H 2 O was dissolved in deionized water and its cation concentration was calibrated, according to Gd 3+ , La 3+ with Zr 4+ The molar ratio of the mixture is measured at a composition ratio of 1:1:2, and is mixed with a mixed salt solution; the mixed salt solution is titrated into the ammonia precipitant solution to a pH value of 11.2 to obtain a mixed solution;

[0042] (2) After aging the mixed solution for 30 hours, carry out suction filtration, and the precipitate filtered out is first washed 4 times with deionized water, and then washed 3 times with absolute ethanol to obtain a colloidal precipitate, which is placed in In an anhydrous ethanol medium equivalent to 1.5 times the volume of the precipitate, stir ev...

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Abstract

The invention discloses a high-purity and uniform-morphology lanthanum zirconate gadolinium ceramic powder preparation method which is characterized by including the steps: (1) dissolving Gd(NO3)3*6H2O, La(NO3)3*6H2O and ZrOCL2*8H2O in water, preparing mixed salt solution according to the mole ratio of Gd<3+>, La<3+> to Zr<4+> of 1:1:2, and titrating the mixed salt solution into ammonia water to obtain mixed solution; (2) performing suction filtration and cleaning after ageing of the mixed solution to obtain gelatinous precipitates, and dispersing the gelatinous precipitates into ethyl alcohol to obtain white slurry; (3) transferring the white slurry into a reaction kettle, performing suction filtration and cleaning after treatment of the white slurry to obtain white precipitates, drying the white precipitates to obtain precursor blocks, and grinding the precursor blocks to obtain precursor powder; (4) calcining the precursor powder, and grinding the calcined precursor powder to obtain GdLaZr2O7 ceramic powder; (a) performing sheeting on the ceramic powder, and performing cold isostatic pressing to obtain ceramic biscuits; (b) performing vacuum sintering on the ceramic biscuits to obtain ceramics; (c) performing annealing on the ceramics in the air, and polishing the surfaces of the ceramics to obtain transparent GdLaZr2O7 ceramic products with high purity, resistance and compactness.

Description

technical field [0001] The invention belongs to the optical function transparent ceramic material technology, in particular to a kind of lanthanum gadolinium zirconate (chemical expression is LaGdZr 2 o 7 ) powder and a method for preparing transparent ceramics thereof. Background technique [0002] Rare earth zirconate materials (Ln 2 Zr 2 o 7 ) due to its low thermal conductivity, high melting point, high thermochemical stability, high ionic conductivity, wide bandgap and other excellent properties, it is used in thermal barrier coating materials for engines, refractory materials, solid electrolytes, and radioactive nuclear waste. , optical materials and other fields have been widely used. As a substitute for single crystal materials, transparent ceramics often have the advantages of high transparency, high melting point, high hardness, easy to enlarge and easy to form, and have attracted extensive attention in the fields of science and application. Such as: military...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/48C04B35/622C04B35/626
CPCC04B35/48C04B35/50C04B35/622C04B35/626C04B2235/5445C04B2235/5454C04B2235/602C04B2235/656C04B2235/6567C04B2235/6581C04B2235/662C04B2235/786C04B2235/9653
Inventor 归冬云祝文军孟川民
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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