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High-temperature nano ceramic coating with high emissivity

A nano-ceramic and high-emissivity technology, applied in the field of coatings, can solve problems such as increased thermal resistance, insufficient load capacity, and decreased surface emissivity

Inactive Publication Date: 2014-06-18
GUANGDONG ZHONGQING HUAXIN ENERGY SCI & TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Contamination and slagging on the heating surface will reduce the surface emissivity (blackness) and increase the thermal conductivity resistance, resulting in a decrease in furnace thermal efficiency, insufficient load capacity, excessive furnace temperature, local overtemperature on the heating surface, and nitrogen oxides (NOx, Mainly a series of safety, energy saving, production capacity and environmental protection issues such as the increase of thermal nitrogen) emissions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 5 parts by mass of styrene-acrylic emulsion, 15 parts by mass of silica sol, 5 parts by mass of calcined kaolin, 30 parts by mass of cerium oxide, 1 part by mass of niobium oxide, 2 parts by mass of yttrium oxide, 2 parts by mass of copper chromium black, 39 parts by mass of water, 0.5 parts by mass of Hensic H-4200 dispersant and 0.5 parts by mass of Hensic H-210 defoamer can be mixed evenly to obtain high-emissivity high-temperature nano-ceramic coatings, of which calcined kaolin, cerium oxide, niobium oxide, yttrium oxide, copper chromium black The particle size is 200-400 nanometers.

Embodiment 2

[0022] 7 parts by mass of styrene-acrylic emulsion, 20 parts by mass of silica sol, 8 parts by mass of calcined kaolin, 35 parts by mass of cerium oxide, 2 parts by mass of niobium oxide, 3 parts by mass of yttrium oxide, 3 parts by mass of cobalt black, 21 parts by mass of water, 0.5 Parts by mass of Hensic H-4200 dispersant and 0.5 parts by mass of Hensic H-231 defoamer can be mixed evenly to obtain high-emissivity high-temperature nano-ceramic coatings, wherein the particle sizes of calcined kaolin, cerium oxide, niobium oxide, yttrium oxide, and cobalt black are uniform. 200-400 nm.

Embodiment 3

[0024] 7 parts by mass of styrene-acrylic emulsion, 20 parts by mass of silica sol, 8 parts by mass of calcined kaolin, 30 parts by mass of cerium oxide, 5 parts by mass of lanthanum oxide, 2 parts by mass of niobium oxide, 3 parts by mass of yttrium oxide, 3 parts by mass of cobalt black, 21 parts by mass of water, 0.5 parts by mass of HensicH-4200 dispersant, and 0.5 parts by mass of Hensic H-231 defoamer can be mixed evenly to obtain a high-emissivity high-temperature nano-ceramic coating, wherein calcined kaolin, cerium oxide, lanthanum oxide, niobium oxide, The particle sizes of yttrium oxide and cobalt black are both 200-400 nanometers.

[0025] The high-emissivity high-temperature nano-ceramic coatings prepared in Examples 1 to 3 are all brownish-yellow, with a density of about 1.5Kg / L. less than 0.94.

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Abstract

The invention relates to the technical field of a coating, and particularly relates to a high-temperature nano ceramic coating with high emissivity. The high-temperature nano ceramic coating with high emissivity is prepared from 20-27wt% of binder, 40-51% of wt% of filler, 21-39% of water and 0.5-1.5wt% of assistant, wherein the binder is one or two of a styrene-acrylic emulsion and ludox; the filler comprises calcined kaolin, a niobium oxide, a rare-earth oxide and an inorganic black pigment; the assistant comprises a dispersant and a defoamer. The high-temperature nano ceramic coating with high emissivity has high temperature resistance, fouling and slagging resistance, high-temperature corrosion resistance and wear resistance, and the emissivity is not smaller than 0.94.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a high-emissivity high-temperature nano-ceramic coating. Background technique [0002] High-emissivity coatings are a class of coatings with good thermal radiation properties. As a new type of functional material, high-emissivity coatings can increase thermal radiation and enhance heat transfer. High-emissivity coatings can be directly sprayed or painted on the heating surfaces or inner walls of various industrial boilers, power plant boilers, flame furnaces, etc. The purpose of improving the heat utilization rate of the furnace and saving energy has received a good energy-saving effect in the application of industrial boilers and kilns. [0003] However, in the actual use process, due to the low bonding strength between the coating material and the base material, the wear resistance and corrosion resistance of the coating material are poor, which makes it easy to cause crackin...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 赵凯周少华
Owner GUANGDONG ZHONGQING HUAXIN ENERGY SCI & TECH IND
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