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Aftertreatment method for doped nano-zirconia powder

A nano-zirconia, powder technology, applied in zirconia, nanotechnology, nanotechnology and other directions, can solve the problems of non-uniform sintering, affecting material properties, difficult to completely eliminate hard agglomeration, etc., and achieve high transparency and high density. Effect

Active Publication Date: 2012-10-03
LIAONING UPCERA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of experimental phenomena show that even under high pressure, there are still a small amount of granulated agglomerates in the green body that are not completely broken. The release of the binder will form interconnected porous particles, which will easily lead to non-uniform sintering, leaving large pores in the sintered body and affecting the material properties
[0012] It can be seen that although there are many methods in the prior art to reduce the hard agglomeration in the doped nano-zirconia powder, these methods are difficult to completely eliminate the hard agglomeration, and provide doped nano-zirconia suitable for dry molding. powder

Method used

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  • Aftertreatment method for doped nano-zirconia powder
  • Aftertreatment method for doped nano-zirconia powder
  • Aftertreatment method for doped nano-zirconia powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] First, prepare 3 moles of yttria stabilized nano-zirconia powder (3Y-TZP) into a slurry with a powder mass fraction of 80%, and use zirconia beads with a diameter of 1 mm and 0.3 mm as the grinding medium. The ratio of zirconium beads is 6:4, the speed of the sand mill is 2000r / min, and the grinding time is 2h. The slurry is sprayed into liquid ammonia to be condensed, and finally dried at a temperature of -10°C and a vacuum of 10 Pa until the moisture completely disappears to prepare nano-zirconia powder.

[0055] The obtained doped nano zirconia powder was tested, and the results are as follows:

[0056] Powder: D50 0.08um, D90 0.21um, D97 0.43um.

[0057] figure 1 with figure 2 They are the particle size distribution curves of the powder before and after the post-treatment method of the present invention. It can be clearly seen from the figure that the post-treatment method of the present invention completely eliminates the hard agglomeration existing in the original pow...

Embodiment 2

[0069] First, 4 moles of yttrium oxide stabilized nano zirconia powder (4Y-PSZ) is prepared into a slurry with a powder mass fraction of 25%, ultrasonic frequency is 40KHz, and treated for 4 hours, then the slurry is sprayed and condensed, and finally at -25 Drying at a temperature of ℃ and a vacuum of 6 Pa until the moisture completely disappears to prepare nano zirconia powder.

[0070] The particle size analysis of the obtained doped nano-zirconia powder is as follows:

[0071] Powder: D500.09um, D900.28um, D970.50um.

[0072] image 3 with Figure 4 These are the particle size distribution curves of the powder before and after the treatment in this embodiment. It can be clearly seen from the figure that the post-treatment method of the present invention completely eliminates the hard agglomeration existing in the original powder.

[0073] Using the powder obtained in this example, a ceramic material was prepared by the same molding and sintering process as in Example 1. Its perfor...

Embodiment 3

[0078] First, use 5 moles of yttria stabilized nano-zirconia powder (5Y-PSZ) with zirconia beads with a size of 0.5mm, 1mm, and 3mm as the grinding medium. The ratio of the three zirconia beads is 4:1::5. Ball ratio: 1:1.2, a slurry with a powder mass fraction of 20%, ball milling for 34 hours, then spray the slurry into liquid ammonia for condensation, and finally dry it at -40°C and a vacuum of 2Pa until The moisture is completely eliminated, and nano-zirconia powder is prepared.

[0079] The particle size analysis of the doped nano-zirconia powder is as follows:

[0080] Powder: D50 0.10um, D90 0.30um, D97 0.55um.

[0081] Figure 5 with Image 6 These are the particle size distribution curves of the powder before and after the treatment in this embodiment. It can be clearly seen from the figure that the post-treatment method of the present invention completely eliminates the hard agglomeration existing in the original powder.

[0082] Performance after sintering: Density after si...

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Abstract

The invention provides an aftertreatment method for doped nano-zirconia powder through spray freeze drying. The nano-powder prepared by the aftertreatment method has the advantages of regular shape, a few hard agglomerates, small particle size, low uniform sintering temperature and the like, and a nano-ceramic material which has the advantages of high density, strength, toughness, light-transmitting property and reliability and the like can be prepared. By the method, personalized nano-zirconia powder with small using amount can be prepared by introducing an additive in the aftertreatment process.

Description

Technical field [0001] The invention relates to a post-treatment method for doped nano-zirconia powder, in particular to a method for post-treatment of doped nano-zirconia powder by adopting a spray freeze drying method. Background technique [0002] Nanomaterials are a new material field developed in the early 1980s, and consist of nanoparticles with a particle size of 1-100nm. Nanomaterials have traditional materials because they have special effects such as surface effects, volume effects, quantum size effects, macro-quantum tunneling effects, and dielectric confinement effects, as well as unique properties in the fields of optics, electricity, magnetism, mechanics and chemistry. Many special physical and chemical characteristics that are not available are widely used in ceramics, coatings, medical and other fields. [0003] Zirconia ceramic is a ceramic material with high hardness, high toughness, low thermal conductivity, good thermal shock resistance, good wear and corrosion...

Claims

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Application Information

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IPC IPC(8): C01G25/02B82Y30/00B82Y40/00
Inventor 严庆云何玲玲王琳郑艳春王鸿娟
Owner LIAONING UPCERA CO LTD
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