CN105693242A - Low temperature corrosion resistant high temperature nano anticorrosion ceramic paint and preparation method thereof - Google Patents

Abstract

The invention discloses a low temperature corrosion resistant high temperature nano anticorrosion ceramic paint and a preparation method thereof. The low temperature corrosion resistant high temperature nano anticorrosion ceramic paint comprises: 5-40wt% of alumina Al2O3, 20-55wt% of zirconia, 20-70wt% of rare earth oxide, and 5-10wt% of an inorganic adhesive. The rare earth oxide is any one or a mixture of over two of praseodymium oxide, promethium oxide, samarium oxide, terbium oxide, scandium oxide, holmium oxide and ytterbium oxide. The low temperature corrosion resistant high temperature nano ceramic coating has the following four characteristics of (1) high temperature resistance (1600DEG C), (2) corrosion resistance (especially resistance to low temperature dew point corrosion), (3) improvement of heat radiation rate and heat exchange rate, and (4) hard and smooth surface not easy to stick ash. If the surface of a boiler combustion chamber refractory material is coated with the paint, the performance of the boiler combustion chamber can be changed by a material science means, thereby enhancing combustion efficiency, improving heat transfer conditions, reducing heat loss due to exhaust gas, and reducing heat transfer temperature; if the paint is applied on a heat exchange tube or resistance heating tube, the coating can bond closely to the heat exchange tube or resistance heating tube to strengthen heat transfer to make heating more uniform, thus reducing maintenance and shutdown time, prolonging pipeline service life, and improving thermal efficiency and product quality.

Description

A kind of high-temperature nano anticorrosion ceramic pain of anti-cold end corrosion and preparation method thereof

Technical field

The present invention relates to field of new, particularly to the high-temperature nano anticorrosion ceramic pain and preparation method thereof of a kind of anti-cold end corrosion。

Background technology

Nano ceramics, because of excellent intensity, toughness, non-oxidizability, corrosion resistance and the superplasticity similar with metal, shows tempting application prospect, but very suffering is prepared but by the nano ceramics of high-compactness。Promote in the process of densification at high temperature sintering, the fast growth of the crystal grain that invariably accompanies。At present, most the non-pressure sintering technology of commercial value is rapid like that not as what envision at this domain variability, greatly constrains the extensive use of nano ceramics。China's application number be 200910307991.7 patent of invention disclose a kind of nano ceramic coat and preparation method thereof, this nano ceramic coat consists of: CeO220 ~ 30wt%, Y2O36 ~ 9wt%, and surplus is ZrO2。With the Zirconium oxide heat barrier coating (ZrO2-Y2O3 of stabilized with yttrium oxide in prior art, YSZ) compare, the present invention adds ceria nanopowder and prepares into nano ceramic coat (CSZ coating), first Presence of an interface between the ceria nanopowder and the ZrO2-Y2O3 that add, growing up of crystal grain needs energy more, secondly there is high local stress between not molten in coating ceria nanopowder and ZrO2-Y2O3, owing to thermal expansion mismatch cooling period produces dislocation, " pinning " is had to act on growing up of crystal grain, cause that CSZ coated grains is less, but the operation of this technique is very difficult, some processes is difficulty with。

Summary of the invention

The technical problem to be solved is to provide low, workable high-temperature nano anticorrosion ceramic pain of a kind of cost and preparation method thereof。

In order to realize the purpose of the present invention, technical scheme provided by the invention:

The high-temperature nano anticorrosion ceramic pain of a kind of anti-cold end corrosion, it is characterised in that including: aluminium oxide Al₂O₃5-40wt%, zirconium oxide 20-55wt%, rare earth oxide 20-70wt%, inorganic bond 5-10wt%, described rare earth oxide is any one or two or more combination in praseodymium oxide, promethium oxide, Disamarium trioxide, terbia. Diterbium trioxide, Scia, holmia, ytterbium oxide。

Described inorganic bond includes any one or two or more combination in silicate, phosphate, sulfate and borate。

Described inorganic bond is waterglass。

The high-temperature nano anticorrosion ceramic pain preparation method of a kind of anti-cold end corrosion, it is characterised in that comprise the following steps:

(1) prepared by nano-powder；

(2) molding；

(3) sintering。

Described step (1), with AA and AHC aqueous solution for raw material, adopts precipitation method to prepare AACH precursor, and products therefrom calcines 1.5h through 1100 DEG C, it is possible to obtain average grain size is the Al of 30nm₂O₃Nano-powder。

Beneficial effects of the present invention: the high-temperature nano ceramic coating of anti-cold end corrosion is used in the heat-transfer surface of boiler, fuel combustion and furnace flue gas and transfers heat to coating surface by radiating with convection heat transfer' heat-transfer by convection mode, and again radiates heat on colder body of heater。High-temperature nano ceramic coating changes the performance of combustor by material science means, thus improving efficiency of combustion, improving heat transfer condition, reduces heat loss due to exhaust gas, reduces heat-exchange temperature。Same on heat-exchange tube, coating will closely bond and strengthen heat exchange, make heating evenly, thus reducing maintenance and furnace outage time, extend pipeline life, improve the thermal efficiency and product quality。

Detailed description of the invention

The high-temperature nano anticorrosion ceramic pain of a kind of anti-cold end corrosion, it is characterised in that including: aluminium oxide Al₂O₃5-40wt%, zirconium oxide 20-55wt%, rare earth oxide 20-70wt%, inorganic bond 5-10wt%, described rare earth oxide is any one or two or more combination in praseodymium oxide, promethium oxide, Disamarium trioxide, terbia. Diterbium trioxide, Scia, holmia, ytterbium oxide。

Described inorganic bond includes any one or two or more combination in silicate, phosphate, sulfate and borate。

Described inorganic bond is waterglass。

The high-temperature nano anticorrosion ceramic pain preparation method of a kind of anti-cold end corrosion, it is characterised in that comprise the following steps;

(1) prepared by nano-powder；

(2) molding；

(3) sintering。

Described step (1), with AA and AHC aqueous solution for raw material, adopts precipitation method to prepare

AACH precursor, products therefrom calcines 1.5h through 1100 DEG C, it is possible to obtain average grain size

Al for 30nm₂O₃Nano-powder。

Embodiment 1

Apply to metal base, as Industrial Boiler or heat exchanger heat-exchange tube (power plant, petrochemical industry,

Oil field etc. all can relate to) or steel alloy, special steel and ordinary steel。

The greasy dirt on blast cleaning metal matrix surface and Slagging；Receive with air gun spraying high temperature

Rice ceramic coating；Coming into operation after ceramic coating is completely dried, ceramic coating is along with boiler tube liter

Temperature heating can be fully cured。

Embodiment 2

Apply to non-metallic material, as from aluminum brick, high wrong brick and all refractory materials。

Sprayed surface palpus structure is intact, the solid cleaning of refractory lining；Change the refractory material worsened,

Sandblasting removes the metal and other materials that corrode in refractory surface；The fire proofed wood that will spray

Material surface must not moisten；RSI high-temperature nano ceramic coating is sprayed with air cannon；Treat pottery painting

Layer puts into after being completely dried and is suitable for；Ceramic coating can be fully cured along with stove intensification heating。

Embodiment 3

Apply to electric heating heater element, such as resistance wire, siliconit and Si-Mo rod。

The greasy dirt of blast cleaning stromal surface and contamination knot slagging scorification；RSI is sprayed high with air anger rifle

Temperature nano ceramic coat；Come into operation after ceramic coating is completely dried；Along with element heats up

Heating can be fully cured。

In sum, high-temperature nano ceramic coating is used in the heat-transfer surface of body of heater, fuel combustion and stove

Kiln flue gas transfers heat to figure layer surface by radiating with convection heat transfer' heat-transfer by convection mode, and again will

Heat is radiated on colder body of heater。High-temperature nano ceramic coating is changed by material science means

Become the performance of combustor, thus improving efficiency of combustion, improving heat transfer condition, reduce smoke evacuation heat

Loss, reduces heat-exchange temperature。Same in process duct, coating will closely bond and strengthen

Heat exchange, makes heating evenly, thus reducing maintenance and furnace outage time, extends pipeline life,

Improve the thermal efficiency and product quality。

Above-described is only the preferred embodiment of the present invention, it is noted that for this area

Those of ordinary skill, without departing from the concept of the premise of the invention, it is also possible to do

Going out some deformation and improvement, these broadly fall into protection scope of the present invention。

Claims (5)

1. the high-temperature nano anticorrosion ceramic pain of an anti-cold end corrosion, it is characterised in that including: aluminium oxide Al₂O₃5-40wt%, zirconium oxide 20-55wt%, rare earth oxide 20-70wt%, inorganic bond 5-10wt%, described rare earth oxide is any one or two or more combination in praseodymium oxide, promethium oxide, Disamarium trioxide, terbia. Diterbium trioxide, Scia, holmia, ytterbium oxide。

2. the high-temperature nano anticorrosion ceramic pain of a kind of anti-cold end corrosion according to claim 1, it is characterised in that described inorganic bond includes any one or two or more combination in silicate, phosphate, sulfate and borate。

3. the high-temperature nano anticorrosion ceramic pain of a kind of anti-cold end corrosion according to claim 2, it is characterised in that described inorganic bond is waterglass。

4. the high-temperature nano anticorrosion ceramic pain preparation method of an anti-cold end corrosion as claimed in claim 1, it is characterised in that comprise the following steps:

(1) prepared by nano-powder；

(2) molding；

(3) sintering。

5. the high-temperature nano anticorrosion ceramic pain preparation method of a kind of anti-cold end corrosion according to claim 4, it is characterized in that, described step (1) is with AA and AHC aqueous solution for raw material, precipitation method is adopted to prepare AACH precursor, products therefrom calcines 1.5h through 1100 DEG C, it is possible to obtain average grain size is the Al of 30nm₂O₃Nano-powder。