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High strength and toughness 3Y-TZP composite ceramic and preparation method thereof

A technology of 3Y-TZP and composite ceramics, which is applied in the fields of 3Y-TZP composite ceramics and their preparation, high-strength and tough 3Y-TZP composite ceramics and their preparation fields, can solve the problems that the effect is not very obvious, and can shorten the sintering time and improve the product quality. performance, effect of reducing sintering time

Inactive Publication Date: 2010-10-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, although some progress has been made in the use of fiber reinforced ceramics, the effect is not very obvious.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 SrCO with a purity of 99.5% 3 , with 99.99% Nb 2 o 5 After weighing the raw materials according to the molar ratio of 2:1, put them into a ball mill tank, use absolute ethanol as the ball mill medium, and ball mill on the ball mill tank for 12 hours; dry and pass through a 100-mesh sieve; then calcined at 1300 ° C for 3 hours, get Sr 2 Nb 2 o 7 powder. Then press 3Y-TZP: SiC whisker: Sr 2 Nb 2 o 7 Weigh the raw materials in a ratio of 80:19:1, the particle size of the 3Y-TZP is 50-100nm, the SiC whisker diameter is 1-3μm, and the length is 2-10μm; As a ball milling medium, ball mill it on a planetary ball mill for 10 hours; dry the slurry obtained by ball milling, and pass through a 100-mesh sieve; mix the sieved powder with 2% polyvinyl alcohol as a binder, and then perform compression molding at a pressure of 20Mpa. The pressed green body was raised to 400°C at a heating rate of 3°C / min in a tube furnace, and held for 0.5h to remove the binder; fin...

Embodiment 2

[0028] Example 2 SrCO with a purity of 99.5% 3 , with 99.99% Nb 2 o 5 After weighing the raw materials according to the molar ratio of 2:1, put them into a ball mill tank, use absolute ethanol as the ball mill medium, and ball mill on the ball mill tank for 24 hours; dry and pass through a 100-mesh sieve; then calcined at 1250 ° C for 4 hours, get Sr2Nb 2 o 7 powder. Then press 3Y-TZP: SiC whisker: Sr 2 Nb 2 o 7 Weigh the raw materials at a ratio of 85:14.85:0.15, the particle size of 3Y-TZP is 50-100nm, the diameter of SiC whiskers is 1-3μm, and the length is 2-10μm; use a zirconia ball mill tank and use absolute ethanol as the ball mill The medium is ball milled on a planetary ball mill for 15 hours; the slurry obtained by ball milling is dried and passed through a 100-mesh sieve; the sieved powder is doped with 3% polyvinyl alcohol as a binder, and then pressed into shape at a pressure of 30 MPa. The compacted green body was raised to 350°C at a heating rate of 5°C / ...

Embodiment 3

[0030] Example 3 SrCO with a purity of 99.5% 3 , with 99.99% Nb 2 o 5 After weighing the raw materials according to the molar ratio of 2:1, put them into a ball mill tank, use absolute ethanol as the ball mill medium, and ball mill on the ball mill tank for 36 hours; dry and pass through a 100 mesh sieve; then calcined at 1200 ° C for 5 hours, get Sr 2 Nb 2 o 7 powder. Then press 3Y-TZP: SiC whisker: Sr2 Nb 2 o 7 Weigh the raw materials at a ratio of 90:7:3, the particle size of 3Y-TZP is 50-100nm, the SiC whisker diameter is 1-3μm, and the length is 2-10μm; use a zirconia ball mill tank and use absolute ethanol as the ball mill The medium is ball milled on a planetary ball mill for 20 hours; the slurry obtained by ball milling is dried and passed through a 100-mesh sieve; the sieved powder is doped with 4% polyvinyl alcohol as a binder, and then pressed into shape at a pressure of 40Mpa. The compacted green body was raised to 300°C at a heating rate of 8°C / min in a tu...

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Abstract

The invention discloses a high strength and toughness 3Y-TZP composite ceramic and a preparation method thereof. The 3Y-TZP composite ceramic consists of 3Y-TZP, a SiC crystal whisker and Sr2Nb2O7; and the preparation method of the 3Y-TZP composite ceramic comprises the steps of preparing and mixing Sr2Nb2O7 powder, ball milling, profiling, degumming and sintering. The composite ceramic is obtained by sintering the SiC crystal whisker and a Sr2Nb2O7 ferroelectric material second-phase addictive which are introduced into the 3Y-TZP. The ceramic material with high strength and toughness can be obtained by adjusting the contents of the SiC crystal whisker and the Sr2Nb2O7 and optimizing a microwave sintering process under the synergistic effect of reinforcing by the SiC crystal whisker and toughening by the Sr2Nb2O7 piezoelectric second phase. The invention has reasonable components and simple preparation process and simultaneously achieves the effects of strengthening and toughening by adopting a synergistic technology of reinforcing by the SiC crystal whisker and toughening by the Sr2Nb2O7 piezoelectric second phase. In addition, the invention is applicable for industrial production, effectively improves the mechanical property of the 3Y-TZP ceramic and widens the application field of the 3Y-TZP ceramic.

Description

technical field [0001] The invention relates to a 3Y-TZP composite ceramic and a preparation method thereof, in particular to a high-strength and tough 3Y-TZP composite ceramic and a preparation method thereof; belonging to the technical field of composite ceramic preparation. Background technique [0002] 3Y-TZP zirconia has the characteristics of low thermal conductivity, high strength and toughness, low elastic modulus, high thermal shock resistance, and high working temperature (1100°C). Therefore, it is used in the manufacture of diesel engine parts, internal combustion engine parts, etc. Partially stabilized zirconia has high hardness and wear resistance, so zirconia is widely used in the field of grinding media and abrasive tools. Since zirconia is non-magnetic, non-conductive, non-rusting, and wear-resistant, it is widely used in the field of biomedical equipment, knives, and tools. Recently, partially stabilized zirconia can be used to prepare magnetically shielde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/622
Inventor 周宏明李荐郭雁军郭欣刘芙蓉
Owner CENT SOUTH UNIV
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