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MgO partially stabilized ZrO, MgO partially stabilized ZrO ceramic, preparation methods of MgO partially stabilized ZrO and MgO partially stabilized ZrO ceramic and application of MgO partially stabilized ZrO ceramic

A technology for stabilizing zirconia and magnesia, applied in the field of magnesia partially stabilized zirconia ceramics and their preparation, and magnesia partially stabilized zirconia field, which can solve the problem that mechanical mixing method is difficult to disperse uniformly, stabilized zirconia has low sintering activity and grain size. growing up etc.

Active Publication Date: 2019-02-15
SHENZHEN SUNTECH ADVANCED CERAMICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main material of magnesia partially stabilized zirconia ceramics is magnesia partially stabilized zirconia. At present, the production methods of magnesia partially stabilized zirconia generally adopt mechanical mixing method or chemical precipitation method. However, mechanical mixing method is difficult to disperse uniformly, and cannot Dispersion at the molecular level. Although the chemical precipitation method can obtain stoichiometric substances, the precipitates are easy to form agglomerations, and both of the above two methods require high-temperature calcination treatment, which is easy to cause grain growth, defect formation and impurity introduction, resulting in oxidation. The sintering activity of magnesia partially stabilized zirconia is lower, resulting in lower flexural strength and toughness of magnesia partially stabilized zirconia ceramics

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  • MgO partially stabilized ZrO, MgO partially stabilized ZrO ceramic, preparation methods of MgO partially stabilized ZrO and MgO partially stabilized ZrO ceramic and application of MgO partially stabilized ZrO ceramic
  • MgO partially stabilized ZrO, MgO partially stabilized ZrO ceramic, preparation methods of MgO partially stabilized ZrO and MgO partially stabilized ZrO ceramic and application of MgO partially stabilized ZrO ceramic
  • MgO partially stabilized ZrO, MgO partially stabilized ZrO ceramic, preparation methods of MgO partially stabilized ZrO and MgO partially stabilized ZrO ceramic and application of MgO partially stabilized ZrO ceramic

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preparation example Construction

[0027] Such as figure 1 As shown, a method for preparing magnesia partially stabilized zirconia ceramics in one embodiment comprises the following steps:

[0028] S110: Mixing magnesia partially stabilized zirconia with sintering aid and toughening agent to obtain a mixture.

[0029] In one embodiment, step S110 includes: ball milling and mixing magnesia partially stabilized zirconia, sintering aid, toughening agent and solvent to obtain a mixed slurry, and then granulating the mixed slurry to obtain a mixture. Specifically, the mass ratio of the sum of the mass of magnesia partially stabilized zirconia, sintering aid and toughening agent to the grinding medium and solvent is 1:2:1; the ball milling time is 12 hours to 24 hours; the mixed slurry The granulation method is spray granulation.

[0030] In one of the embodiments, the step of spray granulation includes: mixing the mixed slurry with binder, dispersant, defoamer and water ball mill to form spray slurry, wherein, in ...

Embodiment 1-1

[0061] The preparation process of the magnesium oxide partially stabilized zirconia of the present embodiment is as follows:

[0062] (1) according to the mol ratio of zirconium element and magnesium element is 10:1, zirconium oxychloride is dissolved in the mixed solution that mass ratio is 1:1.5 water and ethanol, then adds magnesium chloride hexahydrate under the condition of stirring, obtains Premixed liquid, and the molar concentration of zirconium element in the premixed liquid is 1.5mol / L, the molar concentration of magnesium element is 0.15mol / L, then add glycerol, the mass ratio of glycerol and premixed liquid is 0.5:100, obtain Mixture.

[0063] (2) Adjust the pH value of the mixed solution to 3 with ammonia water with a molar concentration of 5 mol / L, then add propylene oxide dropwise to the mixed solution under continuous stirring and 70°C, and the solution in the reaction system starts from transparent The solution turns into a milky white solution, then produces...

Embodiment 1-2

[0066] The preparation process of the magnesium oxide partially stabilized zirconia of the present embodiment is as follows:

[0067] (1) according to the mol ratio of zirconium element and magnesium element is 20:1, zirconium oxychloride is dissolved in the mixed solution that mass ratio is 1:1 water and ethanol, then add magnesium chloride hexahydrate under the condition of stirring, obtain Premix solution, and the molar concentration of zirconium element in the premix solution is 1mol / L, the molar concentration of magnesium element is 0.05mol / L, then add PEG400, the mass ratio of PEG400 and premix solution is 0.1:100, to obtain the mixed solution.

[0068](2) Use ammonia water with a molar concentration of 1mol / L to adjust the pH value of the mixed solution to 2, then add propylene oxide dropwise to the mixed solution under continuous stirring and 60°C, the solution in the reaction system starts from transparent The solution turns into a milky white solution, then produces ...

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Abstract

The invention relates to MgO partially stabilized ZrO, MgO partially stabilized ZrO ceramic, preparation methods of MgO partially stabilized ZrO and the MgO partially stabilized ZrO ceramic and an application of the MgO partially stabilized ZrO ceramic. The preparation method of MgO partially stabilized ZrO comprises following steps: a Zr source and an Mg source in a molar ratio of Zr to Mg being4:1-40:1 are mixed with a dispersing gent in a solvent, and a mixed solution is obtained; the pH value of the mixed solution is regulated to 2-3, under the condition of continuous stirring at 60-80 DEG C, epoxypropane is added to the mixed solution until the pH value of the reaction system reaches 7-8, and a precursor is obtained by solid-liquid separation; the precursor is mixed with water, the mixed solution is subjected to a hydrothermal reaction at 50-220 DEG C, and MgO partially stabilized ZrO is obtained by the solid-liquid separation. With the adoption of the method, MgO partially stabilized ZrO with higher sintering activity can be prepared, so that the MgO partially stabilized ZrO ceramic with higher bending strength and higher toughness is obtained.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a magnesia partially stabilized zirconia, a magnesia partially stabilized zirconia ceramic and a preparation method and application thereof. Background technique [0002] Magnesium oxide partially stabilized zirconia ceramics have high oxygen ion conductivity, high strength and toughness, and good thermal shock resistance, and are very promising high-temperature functional materials and structural ceramic materials. It has excellent mechanical properties including high strength, fracture toughness, wear resistance, good thermal shock resistance and low thermal conductivity. Because of its wear and corrosion resistance, it is widely used in valves, pumps and gaskets, and it is also the material of choice in the chemical processing and petrochemical industries. [0003] The main material of magnesia partially stabilized zirconia ceramics is magnesia partially stabilized zirconia. ...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/48C04B35/626C04B2235/3208C04B2235/3232C04B2235/3274C04B2235/3418C04B2235/443C04B2235/444C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96
Inventor 王绍隆向其军谭毅成
Owner SHENZHEN SUNTECH ADVANCED CERAMICS
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