Preparation method of zirconium oxide structural ceramics

A technology of zirconia ceramics and zirconia, which is applied in the field of yttrium oxide-doped zirconia structural ceramics, which can solve the problems of poor preparation performance, complicated process, and difficult processing of zirconia structural ceramic products.

Inactive Publication Date: 2012-09-19
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of high production cost of zirconia structural ceramics, poor preparation performance, complicated process, and difficult processing of zirconia structural ceramic products, the present invention proposes a preparation method of zirconia structural ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 50g zirconium oxychloride (ZrOCl 2 ·8H 2 O) (contains 36.06% ZrO 2 18.03g) and 16.7ml 0.2mol / L yttrium nitrate solution (ie Y 2 o 3 with ZrO 2 The mass ratio is: 4:96) and mix, add 300ml deionized water to prepare a 0.5mol / L solution; then prepare a 0.5mol / L solution with NaOH as the precipitant; use the chemical co-precipitation method for titration to prepare yttrium-zirconium ceramics Powder. The reaction temperature is 50° C., the pH value of the reaction solution is 8.5, 1.5 g of ammonium citrate is used as a dispersant, and the titration speed and stirring speed of the reactants are controlled.

[0013] After the reaction is completed, add 1000ml of deionized water and stir for 2 hours, let it stand for 24 hours, remove the supernatant, add 1000ml of deionized water, wash, let it stand for aging, and then remove the supernatant, this process is repeated 4 times . Take a small amount of supernatant and add AgNO3 solution dropwise. No white precipitate is f...

Embodiment 2

[0018] 50g ZrOCl 2 ·8H 2 O (contains 36.06% ZrO 2 18.03g) and 34.7ml 0.2mol / L yttrium nitrate solution (ie Y 2 o 3 with ZrO 2 The mass ratio is: 8:92) and mix, add 300ml deionized water to prepare a 0.5mol / L solution; then prepare a 0.5mol / L solution with NaOH as the precipitant; use the chemical co-precipitation method for titration to prepare yttrium-zirconium ceramics Powder. Reaction temperature is 50 ℃, and pH value is 8.50, adds 1.5g ammonium citrate (ZrO 2 7% of the mass) as a dispersant to control the titration rate of the reactants.

[0019] After the reaction is complete, add 1000ml of deionized water and stir for 2 hours, let it stand for 24 hours, remove the supernatant, add 1000ml of deionized water, let it stand for aging, and then remove the supernatant, this process is repeated 4 times. Then the reaction product is subjected to low-frequency ultrasonic vibration washing, and then subjected to static aging. Finally, take a small amount of supernatant t...

Embodiment 3

[0024] 50g ZrOCl 2 ·8H 2 O (contains 36.06% ZrO 2 18.03g) and 34.7ml 0.2mol / L Y(NO 3 ) solution (ie Y 2 o 3 with ZrO 2 The mass ratio is: 8:92) and mix, add 300ml deionized water to prepare a 0.5mol / L solution; then prepare a 0.5mol / L solution with NaOH as the precipitant; use the chemical co-precipitation method for titration to prepare yttrium-zirconium ceramics Powder. Control reaction temperature is 50 ℃, and reaction pH value is 8.50, and adds 1.5g ammonium citrate (ZrO 2 7% of the mass) as a dispersant to control the reaction titration rate.

[0025] After the reaction is completed, add 1000ml of deionized water and stir for 2h, age for 24h, remove the supernatant, add 1000ml of deionized water, age, then remove the supernatant, this process is repeated 4 times. Then carry out low-frequency ultrasonic vibration washing, and then carry out aging. Finally, take a small amount of supernatant to titrate AgNO 3 As long as no white precipitate is formed in the solu...

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Abstract

The invention relates to a preparation method of zirconium oxide structural ceramics, which comprises the following steps: mixing yttrium-oxide-dope zirconium oxide ceramic powder and a binding agent, wherein the binding agent accounts for 10-25 wt% of the mixture; blending the mixture; and carrying out CIM injection molding and vacuum hot-pressed sintering to obtain the zirconium oxide structural ceramics of which the density is up to 6.05-6.1g / cm<3>, the hardness is up to 1050-1400HV and the heat conductivity coefficient is up to 2.3-3W / (m.k). The yttrium-oxide-dope zirconium oxide ceramic powder is prepared by the following steps: carrying out a chemical coprecipitation method to obtain a precipitate, wherein zirconium oxychloride and yttrium nitrate are used as the raw materials, sodium hydroxide is used as a precipitant, and ammonium citrate is used as a dispersant; and washing the precipitate, drying, and presintering to obtain the yttrium-oxide-dope zirconium oxide ceramic powder.

Description

technical field [0001] The invention relates to the preparation of yttria-doped zirconia structural ceramics, belonging to the field of structural ceramics in new materials. Background technique [0002] Zirconia ceramics have the characteristics of high melting point, high hardness, good toughness, high strength, and wear resistance. ball and so on. However, high processing cost and poor preparation performance are two major problems of zirconia structural ceramics, among which the high strength, high hardness and high wear resistance of zirconia structural ceramics are the main reasons for its high processing cost. The preparation of zirconia structural ceramics by adding rare earth trace elements, injection molding, and vacuum sintering has the characteristics of high melting point, high hardness, good toughness, and wear resistance. In recent years, it has attracted extensive attention from domestic and foreign enterprises. Contents of the invention [0003] In order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 杨斌张骞吴珊李明茂
Owner JIANGXI UNIV OF SCI & TECH
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