Method for preparing zirconium oxide ceramic

A zirconia ceramic and zirconia technology, which is applied in the field of preparation of high-performance zirconia ceramics, can solve the problems of high production cost of high-performance zirconia ceramics, difficulty in preparing ceramics with complex shapes, and difficulty in dispersing ultrafine zirconia powders. , to achieve the effect of simplifying vacuum degassing, reducing processing cost and reducing organic matter content

Active Publication Date: 2011-05-25
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of high toxicity of the gel system in the prior art, difficulty in dispersing ultra-fine zirconia powder, difficulty in preparing slurry with high solid phase amount, easy peeling and cracking of the green body, long drying cycle, high-performance oxidation Due to the high production cost of zirconium ceramics, the difficulty of preparing ceramics with complex shapes, and the difficulty of processing ceramics, a method for preparing zirconia ceramics was proposed.

Method used

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  • Method for preparing zirconium oxide ceramic
  • Method for preparing zirconium oxide ceramic
  • Method for preparing zirconium oxide ceramic

Examples

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example 1

[0035] Take 5% monomer MAM (accounting for the mass fraction of the premixed solution, i.e. 5g), then add 0.01% crosslinking agent MBAM (relative to the mass of the monomer, i.e. 1g), add 94 deionized water, and dissolve to obtain 100g premixed Mixed liquid. Take 20g of the premixed solution, and prepare a solid phase amount of 48vol%, that is, add 98g of zirconia powder (primary particle size is 50-150nm), and add 0.2% ammonium polyacrylate according to the mass of zirconia powder, that is, 0.2g , adjust the pH to 7, then add 98g zirconia powder, and obtain a slurry with a solid phase content of 48vol% after ball milling. Using this slurry, 0.2% of initiator APS (relative to the mass of the monomer), ie 0.002 g, was added. Under the condition of vacuum degree of -0.07MPa, after defoaming, pour into the mold, put it in an oven, and take it out after curing at 40°C for 90 minutes. After demoulding, a wet body is obtained, and the gel curing process is completed. The body was ...

example 2

[0037] According to the steps of Example 1, get 35% monomer N-MAM (accounting for the mass fraction of the premixed solution, i.e. 35g), then add 20% crosslinking agent MBAM (relative to the quality of the monomer, i.e. 7g), add 58 to Ionized water, dissolved to obtain 100g premix. Take 20g of the premixed solution, prepare a solid phase amount of 50vol%, that is, add 120g of zirconia powder, add 0.7% sodium carboxylate according to the quality of the zirconia powder, that is, 0.84g, adjust the pH to 9, and then add 120g The zirconia powder is ball-milled to obtain a slurry with a solid phase content of 50 vol%. Using this slurry, 2% of the initiator AIBA (relative to the mass of the monomer), ie 0.14 g, was added. After degassing under the condition of vacuum degree of -0.1MPa, pour it into the mold, put it in an oven, and take it out after curing at 80°C for 25 minutes. After demoulding, a wet body is obtained, and the gel curing process is completed. Place in a humid heat...

example 3

[0039] According to the steps of Example 1, get 20% monomer DMAA (accounting for the mass fraction of the premixed solution, i.e. 20g), then add 10% crosslinking agent MBAM (relative to the quality of the monomer, i.e. 2g), add 78 g of deionized water , dissolved to obtain 100g premix. Take 20g of the premixed solution, and prepare a solid phase amount of 54vol%, that is, add 140g of zirconia powder, according to the quality of the zirconia powder, add 1% phosphoric acid chelate, that is, 1.4g, adjust the pH to 10, and then add 140g of zirconia powder was ball milled to obtain a slurry with a solid phase content of 54vol%. Using this slurry, 5% of the initiator AIBI (relative to the mass of the monomer), ie 0.2 g, was added. After degassing under the condition of vacuum degree of -0.2MPa, pour it into the mold, place it in an oven, and take it out after curing for 35 minutes at 70°C. After demoulding, a wet body is obtained, and the gel curing process is completed. The body wa...

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Abstract

The invention relates to a method for preparing zirconium oxide ceramic, which comprises the following steps of: preparing high solid phase slurry by adopting low-toxicity gel and dispersant, then adding an initiator, performing vacuum deaeration, injecting the slurry into a mold, curing and stripping to obtain a green body, and drying and sintering the green body to obtain the ceramic. The method is used for preparing the green body which has good surface finishment, peeling resistance, cracking resistance, good uniformity and high strength, the strength of the green body is 20 to 40MPa, andthe green body can be directly machined so as to effectively reduce the subsequent processing cost; and the green body can be sintered into the ceramic at one time, the yield reaches 100 percent, theceramic has excellent performance and good stability, the strength is 800 to 1,200MPa, the fracture toughness is 10 to 20MPa.m1/2, the average strength is 550MPa compared with the strength of the drypressing molded ceramic, the average fracture toughness is 8MPa.m1/2, and the performance of the ceramic is greatly improved.

Description

technical field [0001] The invention relates to a method for preparing ceramics, in particular to a method for preparing high-performance zirconia ceramics. Background technique [0002] Zirconia has the characteristics of high melting point and boiling point, high hardness, high toughness and strength, good wear resistance, insulator at room temperature and conductor at high temperature. At present, it has been widely used in ball milling media, cutting tools, micro-fan shafts, fiber optic sleeves, refractory materials, gas-sensitive piezoelectric ceramics and solid oxide fuel cells, etc. According to statistics, the world's sales of zirconia in 2000 were about 45 billion US dollars. . [0003] High ceramic processing costs and poor production stability have always been two major problems in the ceramic field. The high strength, high hardness and superior wear resistance of zirconia ceramics lead to high processing costs. The preparation of zirconia ceramics by coagulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 许海仙丘泰杨建郭坚
Owner NANJING UNIV OF TECH
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