CN105295454A - Ceramic coating slurry and preparation method therefor, ceramic coating and preparation method therefor, and ball ring-shaped sealing element and preparation method therefor - Google Patents
Ceramic coating slurry and preparation method therefor, ceramic coating and preparation method therefor, and ball ring-shaped sealing element and preparation method therefor Download PDFInfo
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Abstract
The invention provides ceramic coating slurry and a preparation method therefor, a ceramic coating and a preparation method therefor, and a ball ring-shaped sealing element and a preparation method therefor. The ceramic coating slurry provided by the invention comprises ceramic powder, a lubricant, organic solvents, an organic dispersant, a binder and a plasticiser; the ceramic powder comprises boron nitride, aluminium oxide and silicon dioxide; and the organic solvents comprise a first organic solvent and a second organic solvent, wherein the first organic solvent and the second organic solvent are mixed to form an azeotropic solvent. The ceramic coating provided by the invention solves the problem that a total coating in a manufacturing process is cracked, and the added organic components have no effect on coating airtightness of the prepared sealing element products.
Description
Technical field
The invention belongs to automotive field, particularly relate to a kind of ceramic coating slurry and preparation method thereof, ceramic coating and preparation method thereof and ball ring shaped sealing element and preparation method thereof.
Background technology
Ball ring shaped sealing element used in automobile exhaust pipe is mostly temperature-resistant graphite material, and has bigger difference between the static friction coefficient of graphite and kinetic friction coefficient, causes joint that abnormal sound occurs.Therefore need the ceramic coating applying heat-resisting lubrication in seal surface to solve this problem, now widely used is BN(boron nitride), PTFE(tetrafluoroethylene), Al
2o
3(aluminum oxide), SiO
2the hybrid ceramic coated material of (silicon-dioxide), take water as solvent, above-mentioned powder is mixed into water-based slurry, be coated on soft graphite coiled material surface with roller, then make coating dry, also cross in insertion wire cloth and formed integrally by extruding between a pair roller, finally use mould compression moulding, make the sealing member product that there is ceramic coating on surface, thus the frictional behaviour of sealing member and joint can be improved, solve vapor pipe abnormal sound problem.
There is following several large shortcoming in the making method of this ceramic coating: ceramic powder can not form good dispersion effect in water-based slurry system, causes ceramic powder to disperse uneven; Carrying out in dry process to coating, coating can curling cracking, and comes off from graphite coiled material, and is difficult to reinforce in insertion wire cloth; The method of the roller coating used in this technology, the coat-thickness of making is uneven, and adjustable scope is smaller, requires also higher to the viscosity of slurry.
Summary of the invention
The present invention be solve the ceramic coating of existing ball ring shaped sealing element can curling cracking.Cohesive force difference technical problem, provides a kind of coating can not curling cracking and good ceramic coating slurry of cohesive force and preparation method thereof, ceramic coating and preparation method thereof and ball ring shaped sealing element and preparation method thereof.
The invention provides a kind of ceramic coating slurry, described slurry comprises ceramic powder, lubricant, organic solvent, organic dispersing agent, binding agent and plastic agent; Described ceramic powder comprises boron nitride, aluminum oxide and silicon-dioxide; Described organic solvent comprises the first organic solvent and the second organic solvent, and described first organic solvent and the second organic solvent are mixed to form azeotropic solvent.
The invention provides after a kind of ceramic coating slurry adopts two kinds to mix and there is the organic solvent of identical boiling point as solvent, make ceramic coating slurry rate of volatilization when solidifying more even, ceramic powder can be made to disperse more even, the ceramic coating made can not ftracture and come off in the process of drying, also the stability of drying process is conducive to, graphite coiled material surface can be sticked to well, and be conducive to the operation carrying out next step.Organic dispersing agent of the present invention, can make ceramic powder disperse more even in the slurry, be conducive to the stability of ceramic coating in drying process; Binding agent by wrapping up ceramic powder, the three-dimensional interconnective resin framework of self-curing formation in drying process, thus makes coating have certain intensity and toughness; Plastic agent add the plasticity that can promote resin glue framework, the stress that absorber coatings produces in drying process, make coating be unlikely to cracking.
Present invention also offers a kind of preparation method of ceramic coating slurry of the present invention, the method comprises ceramic powder, lubricant, organic solvent, organic dispersing agent, binding agent and plastic agent is mixed to get ceramic coating slurry.Preparation method of the present invention is simple, and the ceramic coating slurry prepared is uniformly dispersed.
3rd object of the present invention there is provided a kind of preparation method of ceramic coating, and described method comprises ceramic coating slurry is coated in substrate surface, is then drying to obtain ceramic coating; Described ceramic coating slurry is ceramic coating slurry of the present invention.The ceramic coating prepared by method of the present invention can not ftracture and come off in the process of drying.
4th object of the present invention there is provided ceramic coating prepared by aforesaid method.Ceramic coating of the present invention can not ftracture and come off in the process of drying.
5th object of the present invention there is provided a kind of preparation method of ball ring shaped sealing element, said method comprising the steps of:
S1, ceramic coating slurry to be coated on graphite paper and drying obtains the cated graphite paper of tool;
S2, obtain reinforcing member in step S1 gained containing pressing wire cloth on cated graphite paper;
S3, being wrapped in by wire cloth on mould and being wound around on a wire mesh by graphite paper, and being wound around the above-mentioned reinforcing member prepared at outermost layer, compression molding, produces the ball ring shaped sealing element that surface has heat resistant ceramic coatings;
Described ceramic coating slurry is ceramic coating slurry of the present invention.The ceramic coating of the ball ring shaped sealing element prepared by method of the present invention can not ftracture and come off in the process of drying.
6th object of the present invention there is provided the ball ring shaped sealing element prepared by aforesaid method.The ceramic coating of ball ring shaped sealing element of the present invention can not ftracture and come off in the process of drying.In the present invention, so sealing member works under high-temperature low-oxygen environment, the organic composition major part added in coating is decomposed, and in single coating paste of the present invention, organic content is few, so do not impact the agent structure of coating, also can not affect the resistance to air loss of sealing member simultaneously.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of ceramic coating slurry, described slurry comprises ceramic powder, lubricant, organic solvent, organic dispersing agent, binding agent and plastic agent; Described ceramic powder comprises boron nitride, aluminum oxide and silicon-dioxide; Described organic solvent comprises the first organic solvent and the second organic solvent, and described first organic solvent and the second organic solvent are mixed to form azeotropic solvent.
According to ceramic coating slurry provided by the present invention, in order to reduce organic content as far as possible, corresponding usefulness can be played again simultaneously, control the viscosity of slurry better, preferably, described boron nitride is 35-55 weight part, described aluminum oxide is 3-10 weight part, described silicon-dioxide is 3-10 weight part, described lubricant is 40-60 weight part, and described organic solvent is 200-300 weight part, and described organic dispersing agent is 2-6 weight part, described plastic agent is 1.5-5 weight part, and described binding agent is 5-8 weight part.
According to ceramic coating slurry provided by the present invention, preferably, described first organic solvent is ethanol, and described second organic solvent is dimethylbenzene; Or described first organic solvent is acetone, described second organic solvent is methyl alcohol; Or described first organic solvent is ethanol, described second organic solvent is methyl ethyl ketone.It is ethanol that machine one quality award from the ministry elects described first organic solvent as, and described second organic solvent is dimethylbenzene.In order to reduce costs and decreasing pollution, further, the mass ratio of described ethanol and described dimethylbenzene is 1:0.25-0.65.Described ethanol is 150-200 weight part, and described dimethylbenzene is 50-100 weight part.
According to ceramic coating slurry provided by the present invention, preferably, the mass ratio of described binding agent and described plastic agent is 1:0.5-1.Softening agent is the plasticity regulating binding agent, and measure very few words and coating fragility can be caused large, do not have the effect of plasticising, amount too much will cause the excessive effect affecting coating of plasticity.
According to ceramic coating slurry provided by the present invention, preferably, described binding agent is at least one in polyvinyl butyral acetal, polymethyl acrylate and ethyl cellulose.
According to ceramic coating slurry provided by the present invention, preferably, described polyvinyl alcohol contracting butyl ester is B30 and B60, and described B30 is 3-5 weight part, and described B60 is 5-7 weight part.
According to ceramic coating slurry provided by the present invention, preferably, described plastic agent is at least one in polyoxyethylene glycol, dibutyl phthalate, dimethyl phthalate, diethyl oxalate ester.In order to there be better plasticity, further preferably, described plastic agent is polyoxyethylene glycol and dibutyl phthalate.Still more preferably, the mass ratio of described polyoxyethylene glycol and dibutyl phthalate is 1:0.8-1.2.Described polyoxyethylene glycol is 1.5-5 weight part, and described dibutyl phthalate is 1.5-5 weight part.
According to ceramic coating slurry provided by the present invention, preferably, described organic dispersing agent is at least one in triolein, phosphoric acid ester and menhaden fish oil.More preferably triolein, triolein is organic substance, easy burn off, and other compositions are few.
According to ceramic coating slurry provided by the present invention, preferably, described lubricant is tetrafluoroethylene.
According to ceramic coating slurry provided by the present invention, preferably, the median size of described boron nitride is 1-3 μm, and the median size of described aluminum oxide is 1-3 μm, and the median size of described silicon-dioxide is 1-5 μm, and the median size of described lubricant is 1-5 μm.If particle diameter is too large, may there is gap in coating, the phenomenon leaked air; Particle diameter is too small, and specific surface energy is excessive, is also unfavorable for the stable of slurry, and the little powder cost of particle diameter is higher.
The invention provides a kind of preparation method of ceramic coating slurry described above, the method comprises ceramic powder, lubricant, organic solvent, organic dispersing agent, binding agent and plastic agent is mixed to get ceramic coating slurry.
According to preparation method provided by the present invention, particularly, in mixing tank, add ceramic powder, lubricant and organic solvent, and add organic dispersing agent, after barreling 6-10h, add plastic agent and binding agent, and continue barreling 10-15h, make ceramic coating slurry.
Present invention also offers a kind of preparation method of ceramic coating, described method comprises ceramic coating slurry is coated in substrate surface, is then drying to obtain ceramic coating; Described ceramic coating slurry is ceramic coating slurry of the present invention.
According to preparation method provided by the present invention, preferably, the temperature of described drying is 50-80 DEG C.
Present invention also offers a kind of ceramic coating having aforesaid method to prepare.
Present invention also offers a kind of preparation method of ball ring shaped sealing element, said method comprising the steps of:
S1, ceramic coating slurry to be coated on graphite paper and drying obtains the cated graphite paper of tool;
S2, obtain reinforcing member in step S1 gained containing pressing wire cloth on cated graphite paper;
S3, being wrapped in by wire cloth on mould and being wound around on a wire mesh by graphite paper, and being wound around the above-mentioned reinforcing member prepared at outermost layer, compression molding, produces the ball ring shaped sealing element that surface has heat resistant ceramic coatings;
Described ceramic coating slurry is ceramic coating slurry of the present invention.
According to preparation method provided by the present invention, preferably, after described step, the coating method of S1 is roller coating or scraper coating.More preferably scraper coating, roller is replaced with scraper, slurry is poured in the hopper of scraper, on graphite paper, forms one deck ceramic size coating by the relative movement of graphite paper and the edge of a knife, and can by the thickness regulating the height of the edge of a knife to control coating.
According to preparation method provided by the present invention, preferably, the temperature of described drying is 50-80 DEG C.
According to preparation method provided by the present invention, particularly, ceramic coating slurry is poured in scraper hopper, and flow in the graphite coiled material base band of bottom, the height of the edge of a knife is regulated to be 1.0-1.5mm, by the relative movement of graphite coiled material base band with scraper, in the even and adjustable ceramic size coating of base band surface formation one thickness, dry under painting being placed on the condition of 50-80 DEG C, make solvent evaporates; Then will gather around cated graphite coiled material and be cut into band shape, and insert in wire cloth, add in pressure handle wire cloth press-in coating and graphite coiled material with flat plate mold, coating is reinforced, the graphite coiled material cut and wire cloth are wrapped on mould, and being wound around the above-mentioned reinforcing member prepared at outermost layer, compression molding, produces the ball ring shaped sealing element that surface has heat resistant ceramic coatings.
Present invention also offers a kind of ball ring shaped sealing element prepared by aforesaid method.
Below by specific embodiment, the present invention is described in further detail.
Embodiment 1
An above-mentioned ceramic size composition proportion is as follows: boron nitride (BN, median size is 2 μm) 40g, ptfe micropowder (PTFE, median size is 2 μm) 50g, aluminum oxide (Al
2o
3, median size is 2 μm) and 6g, silicon oxide (SiO
2, median size is 2 μm) and 6g, ethanol: 150g, dimethylbenzene 50g, triolein (dispersion agent) 4g, polyoxyethylene glycol (plastic agent) 2.5g, dibutyl phthalate (plastic agent) 2.5g, polyvinyl butyral acetal (binding agent) 8g(wherein 2gB30,6gB60).
Its manufacture craft is: in mixing tank, 1. add load weighted BN, PTFE micro mist, aluminum oxide, silicon oxide and ethanol, dimethylbenzene and triolein, polyoxyethylene glycol, dibutyl phthalate and PVB(B30, B60 is added) after barreling 8h, and continue barreling 12h, make described ceramic size; 2. slurry is poured in scraper hopper, and flow in the graphite coiled material base band of bottom, the height regulating the edge of a knife is 1.2mm, by the relative movement of graphite coiled material base band and scraper, even and the adjustable ceramic size coating of a thickness is formed on base band surface, dry under painting being placed on the condition of 60 DEG C, make solvent evaporates; 3. will gather around cated graphite coiled material and be cut into band shape, and insert in wire cloth, add in pressure handle wire cloth press-in coating and graphite coiled material with flat plate mold, coating is reinforced, the graphite coiled material cut and wire cloth are wrapped on mould, and being wound around the above-mentioned reinforcing member prepared at outermost layer, compression molding, produces the ball ring shaped sealing element A1 that surface has heat resistant ceramic coatings.
Embodiment 2
An above-mentioned ceramic size composition proportion is as follows: boron nitride (BN, median size is 1 μm) 55g, ptfe micropowder (PTFE, median size is 1 μm) 40g, aluminum oxide (Al
2o
3, median size is 1 μm) and 3g, silicon oxide (SiO
2, median size is 1 μm) and 10g, ethanol: 180g, dimethylbenzene 60g, phosphoric acid salt fat (dispersion agent) 2g, polyoxyethylene glycol (plastic agent) 2.5g, dibutyl phthalate (plastic agent) 2g, polyvinyl butyral acetal (binding agent) 8g(wherein 2gB30,6gB60).
Its manufacture craft is: in mixing tank, 1. add load weighted BN, PTFE micro mist, aluminum oxide, silicon oxide and ethanol, dimethylbenzene and phosphoric acid salt fat, polyoxyethylene glycol, dibutyl phthalate and PVB(B30, B60 is added) after barreling 8h, and continue barreling 12h, make described ceramic size; 2. slurry is poured in scraper hopper, and flow in the graphite coiled material base band of bottom, the height regulating the edge of a knife is 1.5mm, by the relative movement of graphite coiled material base band and scraper, even and the adjustable ceramic size coating of a thickness is formed on base band surface, dry under painting being placed on the condition of 60 DEG C, make solvent evaporates; 3. will gather around cated graphite coiled material and be cut into band shape, and insert in wire cloth, add in pressure handle wire cloth press-in coating and graphite coiled material with flat plate mold, coating is reinforced, the graphite coiled material cut and wire cloth are wrapped on mould, and being wound around the above-mentioned reinforcing member prepared at outermost layer, compression molding, produces the ball ring shaped sealing element A2 that surface has heat resistant ceramic coatings.
Embodiment 3
An above-mentioned ceramic size composition proportion is as follows: boron nitride (BN, median size is 3 μm) 35g, ptfe micropowder (PTFE, median size is 5 μm) 50g, aluminum oxide (Al
2o
3, median size is 3 μm) and 10g, silicon oxide (SiO
2, median size is 5 μm) and 3g, ethanol: 200g, methyl ethyl ketone 100g, menhaden fish oil (dispersion agent) 6g, polyoxyethylene glycol (plastic agent) 1.2g, dibutyl phthalate (plastic agent) 1.5g, polyvinyl butyral acetal (binding agent) 8g(wherein 2gB30,6gB60).
Its manufacture craft is: in mixing tank, 1. add load weighted BN, PTFE micro mist, aluminum oxide, silicon oxide and ethanol, dimethylbenzene and fish oil, polyoxyethylene glycol, dibutyl phthalate and PVB(B30, B60 is added) after barreling 8h, and continue barreling 12h, make described ceramic size; 2. slurry is poured in scraper hopper, and flow in the graphite coiled material base band of bottom, the height regulating the edge of a knife is 1.5mm, by the relative movement of graphite coiled material base band and scraper, even and the adjustable ceramic size coating of a thickness is formed on base band surface, dry under painting being placed on the condition of 60 DEG C, make solvent evaporates; 3. will gather around cated graphite coiled material and be cut into band shape, and insert in wire cloth, add in pressure handle wire cloth press-in coating and graphite coiled material with flat plate mold, coating is reinforced, the graphite coiled material cut and wire cloth are wrapped on mould, and being wound around the above-mentioned reinforcing member prepared at outermost layer, compression molding, produces the ball ring shaped sealing element A3 that surface has heat resistant ceramic coatings.
Embodiment 4
An above-mentioned ceramic size composition proportion is as follows: boron nitride (BN, median size is 2 μm) 50g, ptfe micropowder (PTFE, median size is 2 μm) 50g, aluminum oxide (Al
2o
3, median size is 2 μm) and 6g, silicon oxide (SiO
2, median size is 2 μm) and 6g, acetone: 180g, methyl alcohol 60g, menhaden fish oil (dispersion agent) 4g, polyoxyethylene glycol (plastic agent) 3g, dimethyl phthalate (plastic agent) 3g, polymethyl acrylate (binding agent) 8g.
Its manufacture craft is: in mixing tank, 1. add load weighted BN, PTFE micro mist, aluminum oxide, silicon oxide and ethanol, dimethylbenzene and menhaden fish oil, polyoxyethylene glycol, dimethyl phthalate, polymethyl acrylate is added after barreling 8h, and continue barreling 12h, make described ceramic size; 2. slurry is poured in scraper hopper, and flow in the graphite coiled material base band of bottom, the height regulating the edge of a knife is 1.5mm, by the relative movement of graphite coiled material base band and scraper, even and the adjustable ceramic size coating of a thickness is formed on base band surface, dry under painting being placed on the condition of 60 DEG C, make solvent evaporates; 3. will gather around cated graphite coiled material and be cut into band shape, and insert in wire cloth, add in pressure handle wire cloth press-in coating and graphite coiled material with flat plate mold, coating is reinforced, the graphite coiled material cut and wire cloth are wrapped on mould, and being wound around the above-mentioned reinforcing member prepared at outermost layer, compression molding, produces the ball ring shaped sealing element A4 that surface has heat resistant ceramic coatings.
Comparative example 1
In prior art, the formula of emulsion is: boron nitride (BN) 50g, ptfe micropowder (PTFE) 50g, aluminum oxide (Al
2o
3) 6g, silicon oxide (SiO
2) 6g, water 250g.
Manufacture craft is: added by mentioned component in mixing tank, ceramic size is made after barreling 8h, apply with roller, by this coating operation in triplicate, acquisition has certain thickness coating, then in the air ambient of 80 DEG C, drying is carried out to coating, cut into required shape subsequently, insert in wire cloth also by wire cloth being pressed in coating and graphite coiled material between two rollers, thus coating is reinforced, the graphite coiled material cut and wire cloth are wrapped on mould, and be wound around the above-mentioned reinforcing member prepared at outermost layer, compression molding, produce the ball ring shaped sealing element CA1 that surface has heat resistant ceramic coatings.
Performance test
1, ceramic coating adhesiving effect
Observe in the process preparing ball ring shaped sealing element:
, there is not the obscission that ftractures, be easy to cut in the uniform coating thickness after the drying of the ceramic coating made by embodiment of the present invention 1-4, does not have coating yet and drop in the process of insertion wire cloth, better with graphite coiled material base band adhesiving effect;
Ceramic coating made by comparative example 1 ftractures at the process floating coat of drying, warpage, partial coating comes off from graphite coiled material base band, cut the phenomenon that coating shedding also can occur in the process inserting wire cloth, the adhesiving effect of coating and graphite coiled material base band is bad.
2, thermal weight loss detects
In oxygen-free environment, thermal weight loss test is carried out to product, and contrast with the thermal weight loss in air ambient.Concrete grammar is: be raw material by the graphite of coating, the quality of sample is tested after using mould to be pressed into required graphite seal product compression moulding, subsequently respectively in nitrogen atmosphere under 700 DEG C of thermal treatment 3h and vacuum environment in 700 DEG C of thermal treatment 3h, then test the quality after thermal treatment, contrast.In nitrogen atmosphere 700 DEG C of thermal treatment 3h the results are shown in Table 1, under vacuum environment, 700 DEG C of thermal treatment 3h's the results are shown in Table 2.
3, air-tightness test
By sealing member A1-A4 and CA1 700 DEG C of thermal treatment 3h in nitrogen atmosphere.
By not through Overheating Treatment sealing member A1-A4 and CA1 and the spherical joint place being assembled to vapor pipe through above-mentioned heat treated sealing member respectively, from the dry air passing into 1MPa pressure near engine one end, go out quantity of gas leakage by flow measurement.The results are shown in Table 3.
Table 1
。
Table 2
。
Table 3
。
As can be seen from Table 1 and Table 2, after coating of the present invention processes process rear or 700 DEG C of vacuum atmosphere conditions under 700 DEG C of nitrogen atmosphere conditions under, sealing member mass loss is less.
As can be seen from Table 3, the resistance to air loss of the sealing member after pyroprocessing be not more or less the same through the resistance to air loss of the sealing member of normal temperature process, illustrate that the resistance to air loss of sealing member of the present invention is good.
To sum up, ceramic coating of the present invention solves the problem of the total coating cracking of making processes, and the coating resistance to air loss of the organic composition added on made sealing member product does not affect.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (22)
1. a ceramic coating slurry, is characterized in that, described slurry comprises ceramic powder, lubricant, organic solvent, organic dispersing agent, binding agent and plastic agent; Described ceramic powder comprises boron nitride, aluminum oxide and silicon-dioxide; Described organic solvent comprises the first organic solvent and the second organic solvent, and described first organic solvent and the second organic solvent are mixed to form azeotropic solvent.
2. ceramic coating slurry according to claim 1, it is characterized in that, described boron nitride is 35-55 weight part, described aluminum oxide is 3-10 weight part, and described silicon-dioxide is 3-10 weight part, and described lubricant is 40-60 weight part, described organic solvent is 200-300 weight part, described organic dispersing agent is 2-6 weight part, and described plastic agent is 1.5-5 weight part, and described binding agent is 5-8 weight part.
3. ceramic coating slurry according to claim 1 and 2, is characterized in that, described first organic solvent is ethanol, and described second organic solvent is dimethylbenzene; Or described first organic solvent is acetone, described second organic solvent is methyl alcohol; Or described first organic solvent is ethanol, described second organic solvent is methyl ethyl ketone.
4. ceramic coating slurry according to claim 3, is characterized in that, described first organic solvent is ethanol, and described second organic solvent is dimethylbenzene.
5. ceramic coating slurry according to claim 4, is characterized in that, described ethanol is 150-200 weight part, and described dimethylbenzene is 50-100 weight part.
6. ceramic coating slurry according to claim 1 and 2, is characterized in that, the mass ratio of described binding agent and described plastic agent is 1:0.5-1.
7. ceramic coating slurry according to claim 6, is characterized in that, described binding agent is at least one in polyvinyl butyral acetal, polymethyl acrylate and ethyl cellulose.
8. ceramic coating slurry according to claim 7, is characterized in that, described polyvinyl alcohol contracting butyl ester is B30 and B60, and described B30 is 3-5 weight part, and described B60 is 5-7 weight part.
9. the ceramic coating slurry according to any one of claim 6-8, is characterized in that, described plastic agent is at least one in polyoxyethylene glycol, dibutyl phthalate, dimethyl phthalate and diethyl oxalate ester.
10. ceramic coating slurry according to claim 9, is characterized in that, described plastic agent is polyoxyethylene glycol and dibutyl phthalate.
11. ceramic coating slurries according to claim 10, is characterized in that, the mass ratio of described polyoxyethylene glycol and dibutyl phthalate is 1:0.8-1.2.
12. ceramic coating slurries according to claim 11, it is characterized in that, described polyoxyethylene glycol is 1.5-5 weight part, described dibutyl phthalate is 1.5-5 weight part.
13. ceramic coating slurries according to claim 1, is characterized in that, described organic dispersing agent is at least one in triolein, phosphoric acid ester and menhaden fish oil.
14. ceramic coating slurries according to claim 1, is characterized in that, described lubricant is tetrafluoroethylene.
15. ceramic coating slurries according to claim 1, it is characterized in that, the median size of described boron nitride is 1-3 μm, and the median size of described aluminum oxide is 1-3 μm, the median size of described silicon-dioxide is 1-5 μm, and the median size of described lubricant is 1-5 μm.
The preparation method of the ceramic coating slurry described in 16. 1 kinds of claim 1-15 any one, is characterized in that, the method comprises ceramic powder, lubricant, organic solvent, organic dispersing agent, binding agent and plastic agent are mixed to get ceramic coating slurry.
The preparation method of 17. 1 kinds of ceramic coatings, is characterized in that, described method comprises ceramic coating slurry is coated in substrate surface, is then drying to obtain ceramic coating; Described ceramic coating slurry is the ceramic coating slurry described in claim 1-15 any one.
18. preparation methods according to claim 17, is characterized in that, the temperature of described drying is 50-80 DEG C.
19. 1 kinds of ceramic coatings, is characterized in that, described ceramic coating is prepared by the method described in claim 17 or 18.
The preparation method of 20. 1 kinds of ball ring shaped sealing elements, is characterized in that, said method comprising the steps of:
S1, ceramic coating slurry to be coated on graphite paper and drying obtains the cated graphite paper of tool;
S2, obtain reinforcing member in step S1 gained containing pressing wire cloth on cated graphite paper;
S3, being wrapped in by wire cloth on mould and being wound around on a wire mesh by graphite paper, and being wound around the above-mentioned reinforcing member prepared at outermost layer, compression molding, produces the ball ring shaped sealing element that surface has heat resistant ceramic coatings;
Wherein, described ceramic coating slurry is the ceramic coating slurry described in any one of claim 1-15.
21. preparation methods according to claim 20, is characterized in that, after described step, the coating method of S1 is roller coating or scraper coating.
22. 1 kinds of ball ring shaped sealing elements, is characterized in that, described sealing member is prepared by the method described in claim 20 or 21.
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| CN109561786A (en) * | 2016-08-04 | 2019-04-02 | 德隆吉器具有限公司 | Syringe unit for coffee machine |
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