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A kind of partially stabilized zirconia raw material and its preparation method

A technology for stabilizing zirconia and raw materials, which is applied in the field of zirconia, can solve the problems of reducing the purity of zirconia and increasing the cost of zirconia preparation, and achieves the effects of low production cost, reduced production cost and increased content

Active Publication Date: 2019-07-09
湖南泽尔顿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zirconia is prepared by electrofusion method, which has high purity and good grain growth and development (Tian Feng. "Preparation and Properties of Fused Zirconia Powder", Master's Thesis of Zhejiang University, 2012), but during the desiliconization process The introduced carbon reducing agent increases the preparation cost of zirconia on the one hand; on the other hand, the introduction of carbon reducing agent is easy to produce new harmful impurity phases (such as SiC, Al 4 C 3 etc.), reducing the purity of zirconia

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A partially stabilized zirconia raw material and a preparation method thereof. The preparation method described in this embodiment: firstly, the mass ratio of natural zircon: bauxite: fluorite is 100: (300 ~ 340): (85 ~ 87), natural zircon, bauxite and fluorite Put the stone into the mixer and mix for 20 to 30 minutes to obtain a mixture. Then put the mixture into a vacuum electric arc furnace, raise the temperature to 1600-1630°C, and keep it warm for 20-30 minutes; then remove the upper layer of scum, cool to room temperature with the furnace, and crush to obtain partially stabilized zirconia raw materials.

[0022] The partially stabilized zirconia raw material prepared in this example is tested: ZrO 2 The content is 99.90~99.92wt%; the true density is 5.96~5.98g / cm 3 ; Metastable zirconia content is 90~92wt%.

Embodiment 2

[0024] A partially stabilized zirconia raw material and a preparation method thereof. The preparation method described in this embodiment: firstly, the mass ratio of natural zircon: bauxite: fluorite is 100: (320 ~ 360): (86 ~ 88), natural zircon, bauxite and fluorite Put the stone into the mixer and mix for 20 to 30 minutes to obtain a mixture. Then put the mixture into a vacuum electric arc furnace, raise the temperature to 1600-1630°C, and keep it warm for 20-30 minutes; then remove the upper layer of scum, cool to room temperature with the furnace, and crush to obtain partially stabilized zirconia raw materials.

[0025] The partially stabilized zirconia raw material prepared in this example is tested: ZrO 2 The content is 99.91~99.93wt%; the true density is 5.97~5.99g / cm 3 ; Metastable zirconia content is 91~93wt%.

Embodiment 3

[0027] A partially stabilized zirconia raw material and a preparation method thereof. The preparation method described in this embodiment: firstly, the mass ratio of natural zircon: bauxite: fluorite is 100: (340~380): (87~89), natural zircon, bauxite and fluorite Put the stone into the mixer and mix for 20 to 30 minutes to obtain a mixture. Then put the mixture into a vacuum electric arc furnace, raise the temperature to 1620-1650°C, and keep it warm for 20-30 minutes; then remove the upper layer of scum, cool to room temperature with the furnace, and crush to obtain partially stabilized zirconia raw materials.

[0028] The partially stabilized zirconia raw material prepared in this example is tested: ZrO 2 The content is 99.92~99.94wt%; the true density is 5.98~6.00g / cm 3 ; Metastable zirconia content is 92~94wt%.

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Abstract

The invention relates to a partially stabilized zirconia raw material and a preparation method thereof. The technical solution is: firstly add natural zircon, bauxite and fluorite to the mixer according to the mass ratio of natural zircon: bauxite: fluorite is 100: (300~400): (85~90) , mixed for 20 to 30 minutes to obtain a mixture. Then put the mixture into a vacuum electric arc furnace, raise the temperature to 1600-1650°C, and keep it warm for 20-30 minutes; then remove the upper layer of scum, cool to room temperature with the furnace, and crush to obtain partially stabilized zirconia raw materials. Where: the ZrSiO of the natural zircon 4 Content ≥ 94wt%; the main chemical composition of the bauxite is: Al 2 o 3 Content≥70wt%, SiO 2 The content is 15~20wt%; the CaF of the fluorite 2 Content ≥ 94wt%; vacuum degree of the vacuum electric arc furnace ≤ 0.02Pa. The invention has simple process and low production cost. The prepared partially stabilized zirconia raw material has high purity, good sintering performance and high metastable zirconia content.

Description

technical field [0001] The invention belongs to the technical field of zirconia. Specifically relates to a partially stabilized zirconia raw material and a preparation method thereof. Background technique [0002] Zirconia (ZrO 2 ) mainly occurs in nature with baddeleyite and zircon. It is a high-quality functional / structural ceramic and refractory raw material. It has a high melting point (2700 ° C), high hardness (Mohs hardness 8.0~8.5) and glass resistance. Strong erosion ability of slag, especially ZrO 2 The homogeneous martensitic phase transformation can effectively improve the strength and toughness of the material, so it is widely used in the fields of high-temperature materials such as non-ferrous metals, metallurgy and glass. [0003] At present, the methods for preparing zirconia raw materials mainly include chemical methods, sintering methods and electric melting methods. [0004] Zirconia is prepared by chemical method, mainly using zirconium-containing salt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/626C01G25/02
CPCC01G25/02C01P2006/10C01P2006/80C04B35/481C04B35/626C04B35/62675C04B2235/3217C04B2235/445C04B2235/77
Inventor 张寒赵惠忠李静捷陈琪易萍江文涛范润东余俊
Owner 湖南泽尔顿新材料有限公司