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Multiphase nanometer zirconia mixed powder and preparation method thereof

A technology of nano-zirconia and mixed powder, which is applied in the field of nano-ceramic materials, can solve the problems of increased cost, increased production cost, and high cost of whiskers, and achieves the effects of reduced cost, low cost, and simple implementation

Inactive Publication Date: 2019-05-17
苏州炻原新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although secondary sintering improves the fracture toughness, it leads to a decrease in its mechanical properties and a significant increase in production costs
There are also researchers who use the method of adding whiskers such as SiC whiskers to improve its comprehensive performance. On the one hand, the process of adding whiskers is complicated. On the other hand, due to the high cost of whiskers, the cost increases significantly, and it is not suitable for Applications where material purity is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: a kind of preparation method of heterogeneous nanometer zirconia mixed powder, comprises the following steps:

[0027] (1) Mix commercially available 3Y nano-zirconia solid-solution alloy powder with a grain size of 60nm and commercially available pure nano-zirconia powder with a grain size of 20nm at a molar ratio of 2:1;

[0028] (2) Add the mixed powder into polyacrylamide (PMAA-NH 4 ) in the water of the dispersant, fully stirred to obtain a slurry; wherein, the content of the dispersant is 1.5% of the weight of the solid phase powder, and the solid content of the slurry is 28%;

[0029] (3) Put the slurry into a sand mill and grind it fully until the maximum particle size is less than 800nm, and the D50 is 580nm;

[0030] (4) Add polyvinyl alcohol adhesive with 1.5% solid phase weight to the ground slurry, and stir thoroughly;

[0031] (5) Spray-dry and granulate the stirred slurry, using a centrifugal spray granulation tower with an inlet temperatu...

Embodiment 2

[0035] In this embodiment, a method for preparing a heterogeneous nano-zirconia mixed powder comprises the following steps:

[0036] (1) Mix commercially available 3Y nano-zirconia solid-solution alloy powder with a grain size of 40nm and commercially available pure nano-zirconia powder with a grain size of 25nm at a molar ratio of 2.1:1;

[0037] (2) Add the mixed powder into polyacrylic acid (PAA-NH 4 ) in the water of the dispersant, fully stirred to obtain a slurry; wherein, the amount of the dispersant is 1% of the weight of the solid phase powder, and the solid content of the slurry is 24%;

[0038] (3) Put the slurry into a sand mill and grind it fully until the maximum particle size is less than 800nm, and the D50 is 470nm;

[0039] (4) Add polyacrylic acid (PAA) adhesive with a solid phase weight of 1.5% to the ground slurry, and stir thoroughly;

[0040] (5) Spray-dry and granulate the stirred slurry, using a centrifugal spray granulation tower with an inlet temperat...

Embodiment 3

[0044] In this embodiment, a method for preparing a heterogeneous nano-zirconia mixed powder comprises the following steps:

[0045] (1) Mix commercially available 3Y nano-zirconia solid-solution alloy powder with a grain size of 20nm and commercially available pure nano-zirconia powder with a grain size of 20nm at a molar ratio of 1.95:1;

[0046] (2) Add the mixed powder into polyacrylic acid (PAA-NH 4 ) in water of the dispersant, fully stirred to obtain a slurry; wherein, the amount of the dispersant is 0.8% of the weight of the solid phase powder, and the solid content of the slurry is 21%;

[0047] (3) Put the slurry into a sand mill and grind it fully until the maximum particle size is less than 800nm, and the D50 is 290nm;

[0048] (4) Add polyacrylic acid (PAA) adhesive with a solid phase weight of 2.5% to the ground slurry, and stir thoroughly;

[0049] (5) Spray-dry and granulate the stirred slurry, using a centrifugal spray granulation tower with an inlet tempera...

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Abstract

The invention provides multiphase nanometer zirconia mixed powder used for preparing zirconia ceramic with high intensity and high toughness and a preparation method thereof. The multiphase nanometerzirconia mixed powder is prepared from 3mol percent of yttrium oxide stable nanometer zirconium oxide solid dissolution alloy powder and pure nanometer zirconium oxide powder according to a mole ratioof (1.8 to 2.2):1 through sand grinding, spray granulation and sieving. When the multiphase nanometer zirconia mixed powder is used, the ceramic can be prepared by conventional processes such as drypressing, hot pressure casting and injection; the prepared ceramic has high bending strength (greater than or equal to 1000MPa) and high breaking tenacity (greater than or equal to 9MPa ml / 2); the advantage of low cost is realized.

Description

technical field [0001] The invention belongs to the field of nano-ceramic materials, and in particular relates to a multi-phase nano-zirconia mixed powder for preparing high-strength and high-toughness zirconia ceramics and a preparation method thereof. Background technique [0002] Zirconia has high strength, high fracture toughness and excellent wear resistance due to its inherent unique phase transformation toughening effect, and is widely used in many industrial fields. [0003] According to different temperatures, zirconia has three different phase structures: monoclinic (room temperature~1170°C), tetragonal (1170°C~2370°C) and cubic (>2370°C), and the three phases can be reversed. The phase transition that produces toughening is the transition from the tetragonal phase to the monoclinic phase. Under the action of external force or temperature, when the tetragonal phase transitions to the monoclinic phase, volume expansion and shear strain are generated, and microcra...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/488C04B35/63
Inventor 李飞
Owner 苏州炻原新材料科技有限公司
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