Preparation method for high-toughness nanometer black porcelain material

A high-toughness, nano-technology, applied in the field of preparation of high-toughness nano-black ceramic materials, can solve the problems of low toughness of thermal substrates, limited widespread promotion, poor thermal conductivity, etc., and achieves strong thermal shock resistance, simple process, and lower sintering temperature Effect

Inactive Publication Date: 2014-07-16
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The new type of solar ceramic heat collector is favored by consumers for its advantages of impermeability, impermeabi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation method of high-toughness nano black porcelain material, the steps are as follows:

[0016] 1) Put 3.5g of zirconia, 0.5g of alumina and 1g of titania whisker granular solid raw materials in a ball mill jar, add 50mL of absolute ethanol and use Al2O3 ball wet ball milling for 24 hours, dry the obtained powder The mixture is mixed with polyvinyl alcohol (PVA) solution at a volume ratio of 1:1, dried, ground into powder, and evenly dispersed into nano-ceramic materials. At the same time, 2.5g of yttrium oxide and 2.5g of lanthanum phosphate are added and mixed evenly, dried Afterwards, thermosetting molding is carried out at a vacuum degree of 100 Pa and 1000 ° C, and the obtained nano black porcelain material is ground into powder for later use;

[0017] 2) Put 8g of SiC and 2g of BN granular raw materials into a container, add 100mL of absolute ethanol and mix them with Al2O3 balls for 24 hours, dry them in vacuum for 12 hours, and mix the obtained powdery ...

Embodiment 2

[0020] A preparation method of high-toughness nano black porcelain material, the steps are as follows:

[0021] 1) Put 5.5g of zirconia, 1.5g of alumina and 3g of titania whisker granular solid raw materials into a ball mill jar, add 100mL of absolute ethanol and use Al2O3 ball wet ball milling for 24 hours, dry the obtained powder Mix the mixture with polyvinyl alcohol (PVA) solution at a volume ratio of 1:1, then dry it in a vacuum oven for 12 hours, grind it into a powder, and evenly disperse it in the nano-ceramic material, and add 5g of yttrium oxide and 5g of lanthanum phosphate at the same time And mix evenly, after drying, thermoset molding under the conditions of vacuum degree of 100Pa and 800°C, and grind the obtained nano black porcelain material into powder for later use;

[0022] 2) Put 8g of SiC and 2g of BN granular raw materials into a container, add 100mL of absolute ethanol and mix them with Al2O3 balls for 24 hours, dry them with nitrogen for 12 hours, and m...

Embodiment 3

[0025] A method for preparing a high-toughness nano black porcelain material, the steps of which are basically the same as in Example 2, except that the thermosetting conditions in step 1) are vacuum degree of 100 Pa and temperature of 1000 °C.

[0026] Observing the obtained high-toughness nano black porcelain material through an electron microscope, due to the increase in temperature, the cross-section of the ceramic fragments under the electron microscope is compared with Example 2, and the small holes are much less.

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PUM

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Abstract

The invention provides a preparation method for a high-toughness nanometer black porcelain material. The preparation method comprises the following steps: 1) adding granular solids of zirconia, alumina and titanium dioxide whisker into absolute ethyl alcohol, carrying out wet ball milling, then carrying out mixing with a polyvinyl alcohol solution after drying, adding yttrium oxide and lanthanum phosphate, successively carrying out uniform mixing, drying and thermosetting molding at a high temperature under vacuum and grinding an obtained nanometer black porcelain material into powder; and 2) adding granular raw materials consisting of SiC and BN into absolute ethyl alcohol, carrying out wet ball milling, then carrying out uniform mixing with the nanometer black porcelain material powder after drying, putting an obtained mixture into a graphite die, placing the graphite die in a hot press furnace, carrying out secondary sintering at a high temperature under vacuum and carrying out temperature maintenance so at to prepare the high-toughness nanometer black porcelain material. The invention has the following advantages: the preparation method employs in situ synthesis, yttrium oxide is added as a stabilizing agent, so particle refinement and decrease of sintering temperature are realized; the preparation method is simple and easy to operate and has low cost; and the prepared nanometer black porcelain material has high toughness and good thermal shock resistance and can be used in a solar heat collection plate in replacement of metal.

Description

technical field [0001] The invention relates to a nano black porcelain material, in particular to a preparation method of a high toughness nano black porcelain material. Background technique [0002] Traditional solar collectors use metal as the collector plate, and the metal is easily corroded and rusted, so the service life is only a few years and the cost is relatively high. The new type of solar ceramic heat collector is favored by consumers for its advantages of impermeability, impermeability, non-aging, and non-corrosion. These disadvantages limit its wide application in the market. Therefore, the manufacture of high toughness, good thermal shock resistance and good thermal conductivity of solar ceramic heat collectors must be a major revolution in solar heat collectors. [0003] Nano-ceramic materials developed by using nano-technology have greatly improved their strength, toughness, and thermal conductivity, overcome many shortcomings of engineering ceramics, and ...

Claims

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Application Information

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IPC IPC(8): C04B35/575C04B35/622
Inventor 魏臻张志梅刘学文张岷郭富张洪涛刘京亮魏少帅汤志钦
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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