Method for obtaining porous zirconium dioxide thermal insulation ceramic through shaddock peel

A technology of zirconium dioxide and grapefruit peel is applied in the field of refractory materials, which can solve the problems of complicated operation and high cost, and achieve the effect of uniform voids, simple method and low density.

Inactive Publication Date: 2019-06-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these processes are generally costly and complex to operate

Method used

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  • Method for obtaining porous zirconium dioxide thermal insulation ceramic through shaddock peel
  • Method for obtaining porous zirconium dioxide thermal insulation ceramic through shaddock peel
  • Method for obtaining porous zirconium dioxide thermal insulation ceramic through shaddock peel

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Experimental program
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Effect test

Embodiment 1

[0027] Take 0.25 g of yttrium nitrate hexahydrate, 0.037 g of lanthanum carbonate and 2.5 g of zirconium oxychloride octahydrate and dissolve them in 50 ml of 50vol% ethanol solution. Immerse the dried grapefruit peel in the solution, squeeze it dry after soaking for 5 minutes, take it out and dry it; raise the dried grapefruit peel to 1000°C at a heating rate of 5°C / min, and keep it warm for 1h to prepare porous carbon dioxide. Zirconium ceramics. figure 1 It is the XRD phase of tetragonal zirconia; figure 2 It is a microscopic SEM characterization of porous ceramics at low concentrations, and it can be seen that the ceramic pore walls are relatively thin.

Embodiment 2

[0029] Take 0.40g of yttrium nitrate hexahydrate, 0.05g of lanthanum carbonate, and 4.0g of zirconium oxychloride octahydrate and dissolve them in 20 ml of 50vol% ethanol solution. The dried grapefruit peel was immersed in the solution, soaked for 5 minutes, squeezed dry, taken out and dried; the dried grapefruit peel was raised to 1400°C at a heating rate of 5 minutes, and kept for 1 hour to prepare porous zirconia ceramics. The thermal conductivity of the zirconia porous ceramic prepared by this method is 0.2116 (hot surface 1000°C), and the thermal conductivity of the dense zirconia plate is 0.2834. In comparison, the thermal insulation performance has been improved by about 25%. image 3 , 4 SEM characterization of the zirconia porous ceramics prepared at this concentration shows a clear porous and connected structure.

Embodiment 3

[0031] Take 1.20g of yttrium nitrate hexahydrate, 0.15g of lanthanum carbonate, and 12g of zirconium oxychloride octahydrate and dissolve them in 40 ml of 50vol% ethanol solution. Immerse the dried grapefruit peel in the solution, squeeze it dry after soaking for 5 minutes, take it out and dry it; raise the temperature of the dried grapefruit peel to 1400°C at a rate of 5°C / min, and keep it warm for 1 hour to prepare a porous bismuth. Zirconia ceramic. Figure 5 It is the zirconia porous ceramics prepared under this condition. Obviously, with the increase of concentration and temperature, the morphology of the prepared porous structure is better.

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Abstract

The invention discloses a method for obtaining porous zirconium dioxide thermal insulation ceramic through shaddock peel, and belongs to the field of thermal insulation materials. The method includesthe steps of dissolving zircon salt and other solutes in 50 vol% ethyl alcohol to prepare a solution, soaking the classified porous shaddock peel in the solution, taking the shaddock peel out to be squeezed and dried, and placing the dried shaddock peel in an aerobic atmosphere to be sintered so as to obtain the porous zirconium dioxide ceramic. The method is simple, stable and practical, the prepared porous zirconium dioxide ceramic is high in porosity and good in thermal insulation and fire resistant performance, and the high-temperature phase is high in stability.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a method for obtaining porous zirconia heat-insulating ceramics by using pomelo peels. Background technique [0002] Zirconium dioxide ceramics have high service temperature (2200°C), low density, low thermal conductivity, corrosion resistance, oxidation resistance and other excellent properties, and are currently the most widely used heat insulation materials in the field of high temperature and ultra-high temperature heat insulation. The thermal insulation performance of zirconia ceramics is of great significance. Thanks to the internal structure, porous zirconia ceramics have better thermal insulation performance than conventional dense zirconia ceramics. The preparation of zirconia ceramics with high porosity, high strength and low thermal conductivity has always been a research hotspot. At present, the methods for preparing porous zirconia ceramics include t...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/48C04B35/622
Inventor 王天驰庞旭戴生伢孙鑫袁奇王明心
Owner NANJING UNIV OF SCI & TECH
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