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Method for preparing partially stabilized zirconia ceramics by adopting natural baddeleyite

A technology for stabilizing zirconia and baddeleyite is applied in the field of natural baddeleyite to prepare partially stabilized zirconia ceramics, and natural zirconia is used as raw material to directly prepare zirconia ceramics, which can solve the problems of prolonging production process, increasing cost, pollution and the like, To achieve the effect of short process flow, harmless treatment and lower energy consumption

Inactive Publication Date: 2010-12-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the raw materials used in the preparation of PSZ ceramics are analytically pure or industrially pure raw materials after processing; it not only prolongs the production process, increases the cost, but also causes social energy waste and environmental pollution.

Method used

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  • Method for preparing partially stabilized zirconia ceramics by adopting natural baddeleyite
  • Method for preparing partially stabilized zirconia ceramics by adopting natural baddeleyite

Examples

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Effect test

Embodiment 1

[0017] Weigh natural zirconia and crush it, and the average particle size of particle size grinding to 5.67 μm accounts for 50% of the total amount. The natural zirconia of 3.0wt.% MgO is moved into an agate ball mill jar, and ball milled for 24 hours with a planetary ball mill (rotating speed 250 rpm), the dispersant is alcohol, and the amount added is twice the mass of the material. After ball milling, the material is taken out, dried at 80°C for 6 hours, and the alcohol in the material is removed, and 3wt.% is added to the dried material The binder polyethylene glycol is mixed and stirred for 30 minutes to make the materials evenly mixed, and then formed into a round cake-shaped material under a uniaxial pressure of 100 MPa, and then deglue at 850 ° C, keep it warm for 1 hour, and the heating rate is 5°C / min, after debinding, the heating rate was 4°C / min to 1500°C for sintering and heat preservation for 4 hours, and the cooling rate was 8°C / min to room temperature, and final...

Embodiment 2

[0019] Weigh the natural zirconia for crushing, and grind the particle size until the average particle size of 7.76 μm accounts for 50% of the total amount. Move the natural zirconia added with 4.5wt.% dose of MgO stabilizer into an agate ball mill jar, and use a planetary ball mill for ball milling for 12 hours (rotating speed 350 rev / min), dispersant is alcohol, and the addition amount is 2.5 times of material mass, takes out material after ball milling, and dries at 100 ℃ for 6 hours, removes the alcohol in the material, and adds 3.5 to the material after drying. wt.% binder PVA (polyethylene glycol), mixed and stirred for 40 minutes to make the materials evenly mixed, and formed into a round cake under a uniaxial pressure of 150MPa; The rate is 3°C / min. After debinding, the heating rate is 6°C / min to 1550°C for sintering and heat preservation for 5 hours, and the cooling rate is 10°C / min to room temperature, and finally a partially stable zirconia ceramic product is obtaine...

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Abstract

The invention discloses a method for preparing partially stabilized zirconia ceramics by adopting natural baddeleyite. A finished product of the partially stabilized zirconia ceramics serving as a special ceramic material and a refractory material is prepared from the natural zirconia serving as a raw material by crushing, preparing materials, ball-milling, sintering at the temperature of between 1,300 and 1,600 DEG C and keeping the temperature for 2 to 6 hours. By directly adopting the natural baddeleyite obtained by beneficiation as the raw material without using a processed industrial pure raw material, so no waste residue, no waste gas or no waste liquor is generated in a process. Because the natural zirconia is used as the raw material, the partially stabilized zirconia ceramics can be prepared by only adding a certain amount of stabilizer, ball-milling, caking and sintering without performing additional treatment; process flow is short; energy consumption is reduced; and harmless treatment is realized. The partially stabilized zirconia ceramics is used as the special ceramic material or the refractory material.

Description

1. Technical field [0001] The invention relates to a method for preparing partially stabilized zirconia ceramics by using natural baddeleyite, specifically a method for directly preparing zirconia ceramics by using natural zirconia obtained from ore dressing as a raw material, and belongs to the technical field of pyrometallurgy. 2. Technical background [0002] Zirconia (ZrO 2 ) There are three allotropes, usually in the monoclinic phase (m-ZrO 2 ) exists, and transforms into a tetragonal system (t-ZrO 2 ), the higher temperature transforms into a cubic system (c-ZrO 2 ). At room temperature, zirconium dioxide can only exist in the form of monoclinic phase. If some t-ZrO 2 Metastable to room temperature, to obtain partially stabilized zirconia. Partially stabilized zirconia (Partially Stabilized Zirconia / PSZ) is to metastabilize the cubic phase or tetragonal phase to room temperature to obtain a mixture containing cubic phase, tetragonal phase and monoclinic phase or a...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622
Inventor 彭金辉郭胜惠李静张利波夏洪应刘秉国许磊
Owner KUNMING UNIV OF SCI & TECH
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