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Preparation method of yttrium stabilized zirconium oxide powder with low monoclinic phase and high activity

A technology of yttrium-stabilized zirconia and monoclinic phase, applied in zirconia and other directions, can solve the problems of low yield of ceramic products and less production of high-precision ceramic parts, and achieve low content of monoclinic phase, less agglomeration, and uniform particle size Effect

Active Publication Date: 2013-09-11
西安迈克森新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3mol% yttria-stabilized zirconium is called partially stabilized zirconium, which is composed of three crystal forms: monoclinic phase, tetragonal phase and cubic phase. The existence of monoclinic phase will improve the fracture toughness and strength of zirconia ceramics, but at the same time make The yield of ceramic products has become lower. At present, the content of monoclinic phase in some stable zirconium powders produced in China is about 30%, while the content of monoclinic phase in powder produced abroad can be controlled below 5%. Therefore, the content of domestic zirconia ceramics Most of the production is low-end products, and few high-precision ceramic parts can be produced

Method used

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  • Preparation method of yttrium stabilized zirconium oxide powder with low monoclinic phase and high activity
  • Preparation method of yttrium stabilized zirconium oxide powder with low monoclinic phase and high activity
  • Preparation method of yttrium stabilized zirconium oxide powder with low monoclinic phase and high activity

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Effect test

Embodiment 1

[0029] Get 1000g of zirconium oxychloride (ZrOCl 2 ·8H 2 O) make the solution that concentration is 35g / L after mixing and stirring with pure water for 30min, this solution is put into reactor and adds 179g concentrated H 2 SO 4 , the stirring speed is 60 rpm, and the temperature is raised to 90 °C at a rate of 1 °C / min. After 0.5 h of heat preservation, the precipitate is cleaned and filtered, and the precipitate is added to 5.5 Kg of water. After stirring evenly, 120 g of yttrium chloride solution is added, and the stirring rate is 80 revs / min, after stirring for 20 minutes, start to add 25% ammonia water until the Ph reaches 9.5, after aging for 1 hour, clean and filter the precursor of yttria-stabilized zirconia, add 368g of water and 3.68g of polyethylene glycol 4000, and introduce it into the machine Disperse in a disperser for 2 hours, the speed of the disperser is 1200 rpm, then dry at 100°C, then roast at 900°C for 2.5h, and finally undergo jet milling to obtain the...

Embodiment 2

[0032] Get 1000g of zirconium oxychloride (ZrOCl 2 ·8H 2 O) make the solution that concentration is 38g / L after mixing and stirring with pure water for 30min, put this solution into reactor and add 190g concentrated H 2 SO 4 , the stirring speed is 70 rpm / min, the temperature is raised to 90 °C at a rate of 1.5 °C / min, the precipitate is cleaned and filtered after being kept warm for 1 hour, the precipitate is added to 5.5Kg water, and 120g of yttrium chloride solution is added after stirring evenly, and the stirring rate is 90 Turn / min, after stirring for 20 minutes, start to add 25% ammonia water until the Ph reaches 10, after aging for 1.5 hours, wash and filter the precursor of yttria-stabilized zirconia, add 368g of water and 4g of polyethylene glycol 4000, and introduce mechanical dispersion Disperse in the machine for 2.5 hours, the speed of the disperser is 1100 rpm, then dry at 120°C, then bake at 900°C for 3.5h, and finally get the final powder through jet milling....

Embodiment 3

[0035] Get 1000g of zirconium oxychloride (ZrOCl 2 ·8H 2 O) make the solution that concentration is 41g / L after mixing and stirring 30min with pure water, put this solution into reactor and add 185g concentrated H 2 SO 4 , the stirring speed is 80 revs / min, and the temperature is raised to 90°C at a rate of 2°C / min. After 0.6h of heat preservation, the precipitate is cleaned and filtered, and the precipitate is added to 5.5Kg of water. After stirring evenly, 120g of yttrium chloride solution is added, and the stirring rate is 80 rpm, after stirring for 20 minutes, start to add 25% ammonia water until the Ph reaches 9.8, after aging for 2 hours, wash and filter the precursor of yttria-stabilized zirconia, add 368g of water and 6g of polyethylene glycol 4000, and introduce mechanical dispersion Disperse in the machine for 3 hours, the speed of the disperser is 900 rpm, then dry at 100°C, then bake at 950°C for 2h, and finally get the final powder through jet milling.

[0036]...

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Abstract

The invention discloses a preparation method of yttrium stabilized zirconium oxide powder with low monoclinic phase and high activity. The preparation method comprises the following steps of: reacting zirconium oxychloride serving as a raw material with concentrated sulfuric acid at a high temperature to produce zirconium basic sulfate; performing precipitation reaction on the zirconium basic sulfate serving as a carrier, yttrium chloride and ammonia water in an aqueous solution to finally produce a zirconium stabilized precursor; and mechanically diffusing, drying, sintering and introducing gas flow to finally obtain the yttrium stabilized zirconium oxide powder. The yttrium stabilized zirconium oxide powder is prepared by a chemical and mechanical combined method; and the prepared powder has low monoclinic phase content, less agglomerates and high sintering activity.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a preparation method of yttrium-stabilized zirconia powder with low monoclinic phase and high activity. Background technique [0002] Zirconium dioxide is a very stable oxide with good thermal and chemical stability, excellent high-temperature electrical conductivity, high high-temperature strength and toughness, stable performance and corrosion resistance, and is currently a rapidly developing special ceramic It can be used to produce high-temperature structural ceramics, electronic ceramics, bio-ceramics and ultra-high temperature refractory materials. [0003] Pure zirconia is difficult to produce zirconia ceramics, usually ZrO 2 There are three isomorphs, monoclinic (Monoclinic System), tetragonal (Tetragonal) [0004] System), cubic crystal form (Cubic System), the conversion of the three crystal forms is as follows: [0005] [0006] The crystal form tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02
Inventor 周成钢李宗敏杜斌董海赵仁奎
Owner 西安迈克森新材料有限公司
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