A high-temperature-resistant, stain-resistant and slagging-resistant ceramic coating and its preparation method and application

Abstract

A high temperature-, stain- and slagging-resistant ceramic coating and a preparation method and use thereof. The ceramic coating comprises the following components by mass percentage: 15-30 percent of a filler, 40-65 percent of an adhesive agent and the balance being water, wherein the filler comprises 3-5 percent of zirconia, 3-5 percent of silicon carbide, 3-5 percent of silicon nitride, 1-3 percent of titanium dioxide, 2-4 percent of kaolin and 3-8 percent of a rare earth oxide. The preparation method thereof comprises the steps of mixing the adhesive agent with water to prepare an adhesive agent liquid, then adding the filler refined to a particle size up to 50-900 nm to the adhesive agent liquid, and then adding an auxiliary, uniformly mixing, filtering and packaging. The coating can be applied on the external surfaces of a boiler tube and a heater tube to form a ceramic coating so as to prepare a boiler tube and a heater tube having high performance.

Description

technical field

[0001] The invention belongs to the technical field of special coatings, and in particular relates to a high-temperature-resistant, stain-resistant and slagging-resistant ceramic coating as well as its preparation method and application. Background technique

[0002] In the production and operation of power station boilers, petroleum and petrochemical heating furnaces, and small and medium-sized industrial boilers, the contamination of pulverized coal boilers (including fuel gas heating furnace tubes) has caused great hidden dangers to the safe operation of boilers, and at the same time affects the efficiency of boilers and heating furnaces. Under the action of flue gas, the ash and slag bonded to the water wall or high temperature superheater and the furnace tube of the heating furnace will undergo complex chemical reactions with the tube wall to form high temperature corrosion. Contamination and slagging are generally considered to be the prelude to high-te...

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