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Zirconia ceramic matrix composite and preparation method thereof

A technology for zirconia ceramics and composite materials, which is applied in the field of zirconia ceramic matrix composites and their preparation, can solve the problems of reducing the high temperature performance and chemical stability of ceramics, high cost, and low toughness of ceramic materials, and achieves low oxidation resistance. , Wide application prospects, excellent high temperature mechanical effect

Inactive Publication Date: 2009-10-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many shortcomings in various toughening and reinforcing methods at present. For example, metal reinforcement will reduce the high-temperature performance and chemical stability of ceramics; fiber and whisker toughening have problems such as difficult dispersion, high cost, and unstable performance.
In addition to the low toughness of ceramic materials, the disadvantages of difficult processing and high cost are also the reasons that restrict the large-scale application of structural ceramics.

Method used

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  • Zirconia ceramic matrix composite and preparation method thereof
  • Zirconia ceramic matrix composite and preparation method thereof
  • Zirconia ceramic matrix composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Nb powder, Ti powder, and Cr powder with a particle size of 2000 to 8000nm and a purity of ≥99.0% are mixed according to the ratio of Nb:Ti:Cr=50:37:23, and ball milled under a nitrogen atmosphere. The ball milling time is 20 ~60h, the mill speed is 360r / min, after ball milling, the toughening phase powder with a particle size of 200~500nm is obtained;

[0031] (2) ZrO with a particle size of 10-40nm 2 (3Y) powder and toughening phase powder are mixed according to the volume ratio of 30:70, using QM-1SP2 planetary high-energy ball mill, nickel-chromium stainless steel vacuum ball milling tank and carbide balls, and ball milling under nitrogen atmosphere , the ball milling time is 1h, and the mill speed is 100r / min;

[0032] (3) The mixed powder is hot-pressed and sintered in a multifunctional sintering furnace with a heating rate of 50°C / min and a vacuum degree of 3×10 -3 Pa. The sample was degassed at 500°C for 30 minutes. The sintering temperature is 1250-1450...

Embodiment 2

[0034] (1) Nb powder, Ti powder, and Cr powder with a particle size of 2000 to 8000nm and a purity of ≥99.0% are mixed according to the ratio of Nb:Ti:Cr=50:37:23, and ball milled under a nitrogen atmosphere. The ball milling time is 20 ~60h, the mill speed is 360r / min, after ball milling, the toughening phase powder with a particle size of 200~500nm is obtained;

[0035] (2) ZrO 2 (3Y) powder and toughening phase powder are mixed according to the volume ratio of 40:60, using QM-1SP2 planetary high-energy ball mill, nickel-chromium stainless steel vacuum ball milling tank and carbide balls, and ball milling under nitrogen atmosphere , the ball milling time is 0.5h, and the mill speed is 100r / min;

[0036] (3) The mixed powder is hot-pressed and sintered in a multifunctional sintering furnace with a heating rate of 25°C / min and a vacuum of 3×10 -3 Pa. The sample was degassed at 500°C for 30 minutes. The sintering temperature is 1250-1450° C., the holding time is 60 minutes,...

Embodiment 3

[0038] ZrO 2 (3Y) The powder is mixed with the toughening phase powder at a volume ratio of 50:50, and the other operations are the same as in Example 1.

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Abstract

The invention relates to a zirconia ceramic matrix composite and a preparation method thereof. In the composite, tetragonal zirconia is used as a substrate, and a Nb-Ti-Cr phase is used as a toughening phase, wherein the substrate and the toughening phase account for 20 and 80 volume percent of the total volume of the composite respectively and a sum of the volume percentages of the substrate and the toughening phase is 100 percent. Nb powder, Ti powder and Cr powder are mixed according to the mass ratio of Nb atoms to Ti atoms to Cr atoms of 50:37:23. The preparation method of the zirconia ceramic matrix composite comprises the following steps: ball milling the substrate and the toughening phase and mixing the mixture obtained after ball milling; and preparing the zirconia ceramic matrix composite by hot pressed sintering the mixture under vacuum. The composite of the invention has excellent high-temperature mechanical property and antioxygenic property as well as low cost; and compared with fiber and whisker toughened ceramic, the zirconia ceramic matrix composite has a similar toughening effect, but has simple preparation process, low cost and far more excellent conductivity.

Description

technical field [0001] The invention relates to a zirconia ceramic-based composite material and a preparation method thereof, belonging to the technical field of zirconia-based ceramic materials. Background technique [0002] Tetragonal zirconia (TZP) ceramics is a material with the highest room temperature mechanical properties among ceramic materials. In addition to the inherent brittleness of ceramic materials, the strength and toughness of TZP materials decrease sharply with the increase of temperature. In addition, the disadvantages of low-temperature aging and poor thermal shock resistance have greatly weakened its competitive advantage and limited its scale development and application. The intrinsic brittleness of ceramics determines that the toughening of ceramic materials has become a core issue in ceramic research. At present, the toughening methods of ceramics mainly include phase transformation toughening, fiber (whisker) toughening, particle toughening and compo...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/71C04B35/622
Inventor 李嘉温雨师瑞霞孙富升张宗见
Owner UNIV OF JINAN
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