Grain-composition zirconia powder preparation and ceramic sintering method

A technology of zirconia powder and sintering method, applied in the field of ceramic sintering, can solve the problems of insufficient mixing uniformity, reduced production efficiency, easy introduction of impurities, etc., so as to improve the production process, increase the density of the green body, and reduce the shrinkage of sintering. Effect

Active Publication Date: 2016-09-28
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more common particle grading method is to artificially mix particles of two different sizes. The disadvantages of this method are: first, the mixing

Method used

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  • Grain-composition zirconia powder preparation and ceramic sintering method
  • Grain-composition zirconia powder preparation and ceramic sintering method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh 10mmol of zirconium oxychloride, dissolve it in 20ml of deionized water, add yttrium salt according to the molar ratio of yttrium salt and zirconium salt in a ratio of 3:10, and prepare solution A;

[0023] Ammonia and ammonium bicarbonate are used as precipitating agents, and the molar ratio is 6:4, which is prepared into 2mol / l alkaline solution B;

[0024] Slowly add solution A to solution B dropwise, stir at 1000 rpm for 1 hour, then add polyethylene glycol (PEG, 200), and stir for 0.5 hour;

[0025] Stop stirring and stand still, take the precipitate, centrifuge wash with deionized water and absolute ethanol, filter, dry to obtain a white powder, and then bake the powder in air at 600°C for 4 hours.

[0026] Use water as the dispersion medium, add 2% PVA binder, zirconia ball: powder = 3:1, and dry after 2 hours of ball milling time. Dry pressing at 150MPa followed by cold isostatic pressing to obtain a green body with a density of 65%.

[0027] The sinteri...

Embodiment 3

[0029] Weigh 10mmol of zirconium oxychloride, dissolve it in 10ml of deionized water, add yttrium salt according to the molar ratio of yttrium salt and zirconium salt in a ratio of 7:10, and prepare solution A; use sodium hydroxide and ammonium carbonate as precipitants , to prepare 8mol / l alkaline solution B; mix solutions A and B, stir vigorously, then add polyethylene glycol (PEG), and stir for 2 hours; stop stirring, take the precipitate, and use deionized water and anhydrous Wash with ethanol centrifugally, filter, and dry to obtain a white powder, and then the powder is calcined in air at 1000°C for 4 hours. Use water as the distribution medium, add 2% PVA binder, zirconia ball: powder = 3:1, ball mill for 5 hours, and then dry. After dry pressing at 150MPa, cold isostatic pressing obtained 70% biscuit. The sintering temperature of the final green body is 1700° C., and the temperature is kept for 5 hours. Example 3: Weigh 10 mmol of zirconium oxychloride, dissolve it i...

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Abstract

The invention discloses a grain-composition zirconia powder preparation and ceramic sintering method. The method comprises the following steps: by adopting a co-precipitation method and taking water as a solvent under a weakly alkaline condition, synthesizing nano-scale and submicron-scale mixed particles with specific size distribution by one step at relatively low temperature; adding a fractional precipitation agent into the system, and controlling the proportions of the submicron particles and nanoparticles; drying and calcining the precipitate to obtain grain-composition zirconia powder with high crystallinity; adding a sintering aid; performing mixing, drying and dry pressing; and then sintering at 1,400-1,700 DEG C to obtain dense zirconia ceramic. The method disclosed by the invention is applicable to the grain composition of superfine powder and obtains close packing; and the biscuit density is increased, the sintering shrinkage is reduced, and the production technology is improved. The powder prepared by the method can be applied to the field of high-density zirconia preparation.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a preparation method of particle-graded zirconia powder and ceramic sintering. Background technique [0002] Zirconia is an important structural and functional material with many advantages such as high melting point, high boiling point, small thermal conductivity, large thermal expansion coefficient, good wear resistance, and excellent corrosion resistance. The ceramic industry has a wide range of applications, such as ceramic pigments, engineering ceramics, optical fiber inserts, piezoelectric elements, ion exchangers, and solid electrolytes. In actual application, because zirconia has various crystal transformations, it is prone to volume expansion or shrinkage, which will cause cracking and peeling of the sample and affect its application. Usually, zirconia is doped with a certain amount of stabilizing additives (such as CaO, MgO , Y 2 o 3 and other rare ear...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/626C04B35/64
CPCC04B35/48C04B35/626C04B35/64C04B2235/3225C04B2235/5445C04B2235/5472C04B2235/656
Inventor 何丹农张芳林琳张春明金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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