CN107032809A - A kind of preparation method for boiler heating surface Anti-slagging composite ceramics slurry - Google Patents
A kind of preparation method for boiler heating surface Anti-slagging composite ceramics slurry Download PDFInfo
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- CN107032809A CN107032809A CN201710355004.5A CN201710355004A CN107032809A CN 107032809 A CN107032809 A CN 107032809A CN 201710355004 A CN201710355004 A CN 201710355004A CN 107032809 A CN107032809 A CN 107032809A
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- preparation
- ball mill
- slagging
- binding agent
- blocking
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B2235/386—Boron nitrides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B2235/3873—Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
Abstract
The invention discloses a kind of preparation method for boiler heating surface Anti-slagging composite ceramics slurry, belong to special coating technical field.This method be after mixing hexagonal boron nitride, silicon nitride and binding agent by a certain percentage be placed in 700 DEG C of environment sinter it is blocking.Then product is placed in ball mill and crushed, after obtained broken material is mixed by a certain percentage with adhesive, it is again placed in sintering in 600 DEG C of environment blocking, then it is again placed in crushing in ball mill, broken material and binding agent are finally mixed and added into auxiliary agent and deionized water in proportion, encapsulation is filtered after being ground using planetary ball mill.The slurry being made using this method can form ceramic of compact coating after being coated on boiler heating surface after sintering curing, can effectively prevent the slagging of heating surface.
Description
Technical field
The invention belongs to special coating technical field, and in particular to one kind is used for boiler heating surface Anti-slagging composite ceramics slurry
The preparation method of material.
Background technology
Boiler scaling is the FAQs that coal-burning boiler runs into the process of running, can have a strong impact on the stabilization of boiler operatiopn
Property and economy.Slagging can cause thermal resistance to increase, and make furnace outlet gas temperature higher, easily cause heating surface in horizontal flue because
Overheat and the phenomenons such as booster occur, while can also increase flue gas loss, so as to reduce boiler thermal output.Made every year because of slagging
Into economic loss directly or indirectly it is very huge.
Preventing the technology of boiler scaling at present mainly has optimizing combustor arrangement, increases soot blowing and optimization operational factor etc.,
But above-mentioned means are the problem of fundamentally can not solve boiler scaling.Composite ceramics coating is a kind of new nano ceramics
Material, uses it for effectively preventing heating surface from staiing, corroding on boiler heating surface and weares and teares.However, it is preventing boiler
Ability in terms of slagging need to be improved.
The content of the invention
In view of the shortcomings of the prior art, the present invention is intended to provide a kind of be used for boiler heating surface Anti-slagging composite ceramics slurry
Preparation method, the composite ceramics slurry prepared using the method that provides of the present invention can form one layer of cause on boiler heating surface surface
Close ceramic coating, can effectively prevent the slagging of boiler heating surface.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of preparation method for boiler heating surface Anti-slagging composite ceramics slurry, it is characterised in that be by hexagonal boron nitride,
After silicon nitride and binding agent are mixed by a certain percentage, it is placed in 700 DEG C of environment and sinters blocking, then product is placed in ball mill
It is broken, after obtained broken material is mixed by a certain percentage with adhesive, it is again placed in sintering blocking, Ran Houzai in 600 DEG C of environment
Secondary be placed in ball mill is crushed, and broken material and binding agent are finally mixed and added into auxiliary agent and deionized water in proportion, ball is used
Encapsulation is filtered after grinding machine grinding.
Preferably, the hexagonal boron nitride, silicon nitride and binding agent in mass ratio 5:1:3 uniform mixing, are placed in
Calcination 4 hours in 700 DEG C of Muffle furnaces, makes it in bulk.Cool to the furnace that product is placed in ball mill after room temperature and crush, obtain
Broken material and binding agent in mass ratio 5:After 3 uniform mixing, it is blocking to be again placed in 600 DEG C of Muffle furnace calcination 4 hours, with
Stove is cooled to after room temperature that product is placed in ball mill again and crushed, finally by broken material and binding agent in mass ratio 5:3 is uniform mixed
Auxiliary agent and deionized water are added after conjunction, filters and encapsulates after being ground 4 hours using planetary ball mill.
Binding agent is added in above-mentioned preparation method in three times and is sufficiently mixed, makes hexagonal boron nitride and silicon nitride mixture quilt
Binding agent uniformly parcel three times.It is more uniform that this can be such that particle is distributed in the slurry, greatly improves the structural strength of coating.
In above-mentioned preparation method mixture first sintered at 700 DEG C it is blocking, after ball mill crushing add binding agent again at 600 DEG C
Lower sintering is blocking, then carries out ball mill crushing, and this cycle sintering and broken process can effectively strengthen the chemistry inside mixture
Key, makes it be combined with metallic matrix more firm, while also making coating finer and close.
Preferably, hexagonal boron nitride and silicon nitride have been used in above-mentioned preparation method, and its mass ratio is 5:1,
Hexagonal boron nitride can effectively improve resistive connection slag ability, and silicon nitride is the aggregate of composite ceramics slurry.
Preferably, in above-mentioned preparation method, the average grain diameter of hexagonal boron nitride is 1 μm, the average grain of silicon nitride
Footpath is 500nm.
Preferably, in above-mentioned preparation method, the composition of binding agent is the sodium silicate of modulus 3.0, sodium silicate
With good caking property.
Preferably, in above-mentioned preparation method, auxiliary agent used includes dispersant stearmide, defoamer n-octyl alcohol
With rheological agent organobentonite.Stearmide effectively can prevent particle from settling, and n-octyl alcohol can effectively suppress in slurry preparation process
The generation of foam, organobentonite can improve the stability of slurry as rheological agent.
Preferably, in above-mentioned preparation method, the weight/mass percentage composition of dispersant stearmide is 0.2%-0.3%,
The weight/mass percentage composition of defoamer n-octyl alcohol is 0.15%-0.25%, and rheological agent bentonite weight/mass percentage composition is
0.25%-0.4%。
Compared with prior art, the invention has the advantages that：
In preparation method involved in the present invention, calcination is carried out to hexagonal boron nitride, silicon nitride and binder combination in two times
With crushing, and every time, the temperature of calcination is gradually reduced, and this process repeatedly can make equably to wrap up many outside filler particles
Layer adhesive, the slurry being made in this way, which is coated on behind metal surface, can strengthen the chemistry between coating particles and matrix
Key, combines it more firm, difficult for drop-off.Ceramic aggregate is superfine powder, with larger specific surface area, is being sintered
After solidification the structure of coating can be made finer and close, so as to effectively prevent erosion and abrasion of the flying dust to coating.Hexagonal boron nitride
Learn property stable and inert to all molten metal chemistry, the slagging prevention capacity of composite ceramics coating can be greatly improved.
In addition, the preparation method for the Anti-slagging composite ceramics slurry that the present invention is provided is simple and easy to apply, and cost is relatively low, with
Expensive on the market and complicated preparation method ceramic coating, which is compared, has more preferable economy and operability.Specifically applying
In terms of work, slurry spraying prepared by the present invention is simple and convenient, using heat during boiler combustion by coating sintering curing, significantly
Improve economy.
Brief description of the drawings
Fig. 1 characterizes material surface contact angle for the present inventionSchematic diagram.
Fig. 2 is the comparison chart of two comparative examples of the invention.
Embodiment
The present invention is described in further detail with reference to example, the present invention is not limited by the following examples.
Embodiment 1：
After 100g hexagonal boron nitrides, 20g silicon nitrides and 60g sodium silicates uniformly mixing, it is placed in 700 DEG C of Muffle furnace and sinters
It is blocking, with after stove natural cooling in ball mill ball mill crushing 1 hour.Powder after taking 170g broken, adds 102g sodium water glass
Glass, be placed in after uniform mixing in 600 DEG C of Muffle furnace sinter it is blocking, with ball mill crushing 1 is small in ball mill after stove natural cooling
When.The powder after 260g second-time breakages is taken, 156g sodium silicates, 2.1g stearmides, 1.6g n-octyl alcohols, 2.6g organic bentonites is added
Profit soil and 633.5g deionized waters, filter after being ground 4 hours through planetary ball mill and encapsulate.
The Anti-slagging composite ceramics slurry prepared in embodiment 1 is coated on the conventional steel 20G matrixes of boiler heating surface
Surface, and its Anti-slagging performance is tested.
The specific operation process of coating coating is as follows：
Surface sand-blasting process, then the composite ceramic that will be prepared in embodiment 1 are carried out to 20 × 20 × 2mm 20G samples steel disc first
Porcelain slurry even application is in specimen surface, and coating thickness is about 60 ~ 80 μm.After spraying is finished, sample is placed in Muffle furnace and added
Heat cure, specific heating process is as follows：With 5 DEG C/min speed 120 DEG C, after constant temperature is kept for 2 hours, then with 5 are risen to from room temperature
DEG C/min speed rises to 500 DEG C from 120 DEG C, constant temperature cools to room temperature with the furnace after being kept for 4 hours.Use this side of being heating and curing
The purpose of formula is to simulate the temperature-rise period of boiler water-cooling wall on startup.
Contact angle is an important parameter for characterizing material surface energy, and surface can influence the principal element of slagging.
Therefore, Anti-slagging performance test is carried out to the coating sample after above-mentioned be heating and curing using Contact-angle measurement method, contact angle is got over
Greatly, illustrate that material Anti-slagging performance is better.
Figure belowAs contact angle.
Specific process of the test is as follows：
It is that 1g glass dust is pressed into the cylinder of same shape respectively by 2 parts of quality, is respectively placed in coating sample and big
It is small be 20 × 20 × 2mm and 20G matrix of the surface through blasting treatment on, by said sample simultaneously be placed in Muffle furnace heat, see
Examine the situation of change of contact angle under different temperatures.This sentences glass dust simulation coal ash, because the composition of glass dust is similar with coal ash.
Result of the test below figure 2：
, it is apparent that the contact angle of molten melt drop is more than the contact angle of left side molten melt drop, explanation on the coating sample of the right
The nano ceramics slurry prepared using this method has excellent Anti-slagging characteristic.
Described above is only the preferred embodiment of the present invention, it should be noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and modification can also be made, these improvement and modification
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of preparation method for boiler heating surface Anti-slagging composite ceramics slurry, it is characterised in that by hexagonal boron nitride,
After silicon nitride and binding agent are mixed by a certain percentage, it is placed in 700 DEG C of environment and sinters blocking, then product is placed in ball mill
It is broken, after obtained broken material is mixed by a certain percentage with adhesive, it is again placed in sintering blocking, Ran Houzai in 600 DEG C of environment
Secondary be placed in ball mill is crushed, and broken material and binding agent are finally mixed and added into auxiliary agent and deionized water in proportion, ball is used
Encapsulation is filtered after grinding machine grinding.
2. preparation method according to claim 1, it is characterised in that hexagonal boron nitride, silicon nitride and binding agent are pressed into quality
Than 5:1:After 3 uniform mixing, it is placed in 700 DEG C of Muffle furnaces and sinters 3-5 hours, makes it in bulk, the product after sintering is placed in
Crushed in ball mill, obtained broken material and adhesive in mass ratio 5:After 3 uniform mixing, 600 DEG C of Muffle furnace is again placed in
Middle sintering 3-5 hours is blocking and product is placed in ball mill crushed, finally by broken material and binding agent in mass ratio 5:3 is uniform
Auxiliary agent and deionized water are added after mixing, filters and encapsulates after being ground 4 hours using planetary ball mill.
3. preparation method according to claim 1, it is characterised in that be placed in 700 DEG C of Muffle furnaces and sinter 4 hours, it is set to be in
Bulk, be again placed in 600 DEG C of Muffle furnace sinter 4 hours it is blocking.
4. the preparation method of Anti-slagging composite ceramics slurry according to claim 1, it is characterised in that hexagonal boron nitride
Average grain diameter is 1 μm, and the average grain diameter of silicon nitride is 500nm.
5. preparation method according to claim 1, it is characterised in that binding agent used is the sodium silicate of modulus 3.0.
6. preparation method according to claim 1, it is characterised in that auxiliary agent used is including weight/mass percentage composition
0.2%-0.3% stearmide is used as froth breaking as dispersant, weight/mass percentage composition for 0.15%-0.25% n-octyl alcohol
Agent, weight/mass percentage composition is used as rheological agent for 0.25%-0.4% organobentonite.
7. preparation method according to claim 1, it is characterised in that the mass percent of the deionized water is 60%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710355004.5A CN107032809B (en) | 2017-05-19 | 2017-05-19 | Preparation method of composite ceramic slurry for preventing slag formation on heating surface of boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710355004.5A CN107032809B (en) | 2017-05-19 | 2017-05-19 | Preparation method of composite ceramic slurry for preventing slag formation on heating surface of boiler |
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| CN107032809A true CN107032809A (en) | 2017-08-11 |
| CN107032809B CN107032809B (en) | 2020-02-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116218262A (en) * | 2023-02-15 | 2023-06-06 | 广西大学 | Preparation method of boiler water-cooled wall slag-bonding-preventing nano composite ceramic coating |
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| US20030211368A1 (en) * | 2000-07-27 | 2003-11-13 | Yazaki Corporation | Ceramic foam and process for producing the same |
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| CN104446325A (en) * | 2014-11-26 | 2015-03-25 | 清大赛思迪新材料科技（北京）有限公司 | High temperature, contamination and slagging resistant ceramic paint as well as preparation method and application of high temperature, contamination and slagging resistant ceramic paint |
| CN104987032A (en) * | 2015-06-08 | 2015-10-21 | 杭州赤田能源科技有限公司 | Fouling and slagging resistance and high temperature and corrosion resistance ceramic paint and preparation and usage method thereof |
| CN105110766A (en) * | 2015-08-28 | 2015-12-02 | 兆山科技（北京）有限公司 | Ceramic paint and application thereof |
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2017
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030211368A1 (en) * | 2000-07-27 | 2003-11-13 | Yazaki Corporation | Ceramic foam and process for producing the same |
| CN104108939A (en) * | 2013-04-17 | 2014-10-22 | 哈尔滨华电金能电力技术有限公司 | Anti-contamination slag-bonding-resistant high-temperature ceramic coating suitable for metal substrates |
| CN104446325A (en) * | 2014-11-26 | 2015-03-25 | 清大赛思迪新材料科技（北京）有限公司 | High temperature, contamination and slagging resistant ceramic paint as well as preparation method and application of high temperature, contamination and slagging resistant ceramic paint |
| CN104987032A (en) * | 2015-06-08 | 2015-10-21 | 杭州赤田能源科技有限公司 | Fouling and slagging resistance and high temperature and corrosion resistance ceramic paint and preparation and usage method thereof |
| CN105110766A (en) * | 2015-08-28 | 2015-12-02 | 兆山科技（北京）有限公司 | Ceramic paint and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116218262A (en) * | 2023-02-15 | 2023-06-06 | 广西大学 | Preparation method of boiler water-cooled wall slag-bonding-preventing nano composite ceramic coating |
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| CN107032809B (en) | 2020-02-18 |
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