Patent ID: 11858868
Assignee: XUZHEN NEW ENERGY TECHNOLOGY CO LTD
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 2:
3. A method for preparing the coal-fired boiler with the anti-corrosion and anti-coking ceramic coating with easy state identification as claimed in claim 1, comprising:
step 1, weighing raw materials comprising in parts by weight, 20-30 parts of the sodium silicate, 1-4 parts of the lanthanum oxide, 1-4 parts of the niobium pentoxide, 10-20 parts of the aluminum oxide, 7-12 parts of the bismuth oxide, 1-3 parts of the boron oxide, 1-3 parts of the zinc oxide, 1-3 parts of the silicon oxide, 5-10 parts of the titanium dioxide, 2-6 parts of the nano whisker, 1-5 parts of the titanium nitride, and 10-15 parts of the graphite fluoride;
step 2, adding deionized water that is 1.5-2 times the loose packing volume of the raw materials of step 1 to the sodium silicate, and stirring to be uniform, to obtain a mixture I for use;
step 3, mixing and ball milling the lanthanum oxide, the niobium pentoxide, the aluminum oxide, the bismuth oxide, the boron oxide, the zinc oxide, the silicon oxide, the titanium dioxide, and the titanium nitride in a high-energy ball mill for 4-6 h, to obtain a powder mixture II;
step 4, stirring the graphite fluoride, the nano whisker, and the powder mixture II obtained in step 3 in a mixer for 0.5-1 h, to obtain a mixture III;
step 5, adding the mixture I obtained in step 2 to the mixture III obtained in step 4, and stirring in a mixer for 0.5-1 h, to obtain a bottom coating for use;
step 6, weighing raw materials comprising, in parts by weight, 20-30 parts of the sodium silicate, 1-4 parts of the lanthanum oxide, 1-4 parts of the niobium pentoxide, 5-10 parts of the chromium oxide, 5-10 parts of the aluminum oxide, 7-12 parts of the bismuth oxide, 1-3 parts of the boron oxide, 1-3 parts of the zinc oxide, 1-3 parts of the silicon oxide, 10-15 parts of the graphite fluoride, 1-5 parts of the titanium nitride, 5-10 parts of the silicon carbide, 2-6 parts of the nano whisker, and 2-6 parts of the cobalt green;
step 7, adding deionized water that is 1.5-2 times the loose packing volume of the raw materials of step 6 to the sodium silicate, and stirring to be uniform to obtain a mixture IV for use;
step 8, mixing and ball milling the lanthanum oxide, the niobium pentoxide, the chromium oxide, the aluminum oxide, the bismuth oxide, the boron oxide, the zinc oxide, the silicon oxide, the titanium nitride, the silicon carbide, and the cobalt green in a high-energy ball mill for 4-6 h, to obtain a powder mixture V;
step 9, stirring the graphite fluoride, the nano whisker and the powder mixture V obtained in step 8 in a mixer for 0.5-1 h, to obtain a mixture VI;
step 10, adding the mixture IV obtained in step 7 to the mixture VI obtained in step 9, and stirring in a mixer for 0.5-1 h, to obtain a surface coating for use;
step 11, pretreating a surface of the coal-fired boiler by using a sandblasting technology until a cleanliness of Sa3.0 level and a roughness of 25-75 μm are reached; and
step 12, spraying the bottom coating onto the surface of the coal-fired boiler; drying the bottom coating to obtain the bottom coating layer; spraying the surface coating onto the bottom coating layer, drying the surface coating to obtain the surface coating layer, sintering the bottom coating layer and the surface coating layer at 400° C. for 30 min, to obtain the coal-fired boiler with the anti-corrosion and anti-coking ceramic coating with easy state identification.