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Preparation method for novel Al2O3/ZrO2(Y2O3) complex-phase ceramic

A composite phase ceramic, a new type of technology, applied in the field of high-temperature structural ceramics, can solve the problem of uneven distribution of second-phase crystal particles, achieve good mechanical properties, improve mechanical properties, and limit agglomeration

Inactive Publication Date: 2017-06-13
江苏省陶瓷研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is a relatively simple and relatively cheap method, but a major disadvantage is that the produced Al 2 o 3 / ZrO 2 (Y 2 o 3 ) Composite ceramics are prone to uneven distribution of second phase crystal particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Weigh α-Al 2 o 3 51.54wt%, CaCO 3 0.10wt%, MgCO 3 0.10wt%, kaolin 0.26wt%, 10% PVA solution 3wt%, deionized water 45wt%, of which α-Al 2 o 3 For passing through 400 mesh fine powder, CaCO 3 , MgCO 3 1. Kaolin is a 250-mesh fine powder, which is wet-milled in a ball mill for 36 hours to obtain a water-based slurry with an average particle size of 1.6 μm. The water-based slurry is processed into a dry-pressed blank by spray granulation, and pressed at a pressure of 120 MPa to obtain Al in desired shape and size 2 o 3 Ceramic green body, dry the green body at 80°C for 12 hours to make the moisture content of the green body ≤1wt%, and finally put it into the kiln, heat up to 1300°C at a speed of 0.5°C / min, and keep the temperature at the highest temperature for 3h, Cool down to room temperature with the furnace to get Al 2 o 3 porous ceramics.

[0018] (2) Weigh 45.8wt% of zirconium nitrate, 2.8wt% of yttrium nitrate, 36.7wt% of deionized water, keep stirring...

Embodiment 2

[0023] (1) Weigh α-Al 2 o 3 52.53wt%, Y 2 o 3 0.11wt%, kaolin 0.36wt%, 10% PVA solution 7wt%, deionized water 40wt%, of which α-Al 2 o 3 , Y 2 o 3 For passing through 400 mesh fine powder, CaCO 3 1. Kaolin is a 250-mesh fine powder, which is wet-milled in a ball mill for 16 hours to obtain a water-based slurry with an average particle size of 4.7 μm. The water-based slurry is processed into a dry-pressed blank by spray granulation, and pressed at a pressure of 100 MPa to obtain Al in desired shape and size 2 o 3 Ceramic green body, dry the green body at a temperature of 70°C for 18 hours, so that the moisture content of the green body is ≤1wt%, and finally put it into the kiln, raise the temperature to 1350°C at a speed of 0.8°C / min, and keep the temperature at the highest temperature for 2h, Cool down to room temperature with the furnace to get Al 2 o 3 porous ceramics.

[0024] (2) Weigh 42.0wt% of zirconium nitrate, 2.6wt% of yttrium nitrate, 41.9wt% of deioniz...

Embodiment 3

[0030] (1) Weigh α-Al 2 o 3 56.72wt%, Y 2 o 3 0.17wt%, MgCO 3 0.11wt%, 10% PVA solution 5wt%, deionized water 38wt%, of which α-Al 2 o 3 , Y 2 o 3 For passing 400 mesh fine powder, MgCO 3 In order to pass 250-mesh fine powder, add a ball mill to wet mill for 24 hours to obtain a water-based slurry with an average particle size of 3.1 μm. The water-based slurry is processed into a dry-pressed blank by spray granulation, and pressed at a pressure of 120 MPa to obtain the required Shape and size of Al 2 o 3 Ceramic green body, dry the green body at 60°C for 24 hours to make the moisture content of the green body ≤ 1wt%, and finally put it into the kiln, heat up to 1400°C at a speed of 1.0°C / min, and keep the temperature at the highest temperature for 2h, Cool down to room temperature with the furnace to get Al 2 o 3 porous ceramics.

[0031] (2) Weigh 35.0wt% of zirconium nitrate, 2.2wt% of yttrium nitrate, 51.6wt% of deionized water, keep stirring in a water bath a...

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Abstract

The invention discloses a preparation method for novel Al2O3 / ZrO2(Y2O3) complex-phase ceramic. The preparation method comprises the following steps: firstly, preparing Al2O3 powder into Al2O3 porous ceramic; then, soaking the Al2O3 porous ceramic into a liquid containing Zr<4+> and Y<3+> under a vacuum environment, filling the liquid into holes of the Al2O3 porous ceramic; performing hydrothermal reaction for curing and attaching Zr<4+> and Y<3+> in the liquid to the surfaces of the Al2O3 particles; and finally, drying and burning to obtain the novel Al2O3 / ZrO2(Y2O3) complex-phase ceramic. According to the preparation method disclosed by the invention, ZrO2 and Y2O3 are uniformly dispersed in the complex-phase ceramic, so that agglomeration is avoided, and the action, on improving the mechanical properties of the material, of the second phase is strengthened; and moreover, the preparation process is simple, implantation and popularization are convenient, and large-scale production can be performed on an existing Al2O3 ceramic production line.

Description

technical field [0001] The invention belongs to the technical field of high-temperature structural ceramics and relates to an Al 2 o 3 / ZrO 2 (Y 2 o 3 ) composite ceramics and a preparation method thereof. Background technique [0002] al 2 o 3 Ceramic materials have the characteristics of high temperature resistance, chemical corrosion resistance, oxidation resistance, wear resistance, high mechanical strength, and high insulation, and are the most widely used high-temperature structural ceramic materials. However, the resulting Al we actually produce 2 o 3 There is a large gap between the mechanical properties of ceramic materials and the theoretical values. One of the main reasons is that Al 2 o 3 When ceramic materials are fired at high temperature, the original Al 2 o 3 Particles will grow to a larger size through grain growth, Al 2 o 3 An increase in grain size leads to a decrease in the mechanical properties of the material. by Al 2 o 3 Introducing Zr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/10C04B35/64
CPCC04B35/10C04B35/64C04B38/0041C04B2235/3206C04B2235/3208C04B2235/3225C04B2235/3244C04B2235/349C04B2235/616C04B2235/661C04B2235/77C04B2235/96C04B38/0067
Inventor 许小静李平王帅徐泽跃郭文飞陆丽芳伦文山
Owner 江苏省陶瓷研究所有限公司
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