Summary of the invention
The technical problem to be solved in the present invention is the deficiency existed for prior art, provides system a kind of preparation method based on high temperature solar composite coating for absorbing in chromium aluminium Mn oxide function powder.
The present invention's one is achieved by following technical proposals based on chromium aluminium Mn oxide function powder solar absorption preparation method of composite coating: a kind of preparation method based on high temperature solar composite coating for absorbing in chromium aluminium Mn oxide function powder, it is characterized in that coating comprises following mixing raw material: chromium sesquioxide mass ratio 55%, the aluminium sesquioxide 35% of interpolation, tetrahydrate manganese chloride 10%; Binding agent is 1053 silicone resins, and dispersion agent is glycerol, and ratio is mixing raw material: binding agent: dispersion agent=500:10:2;
Described method comprises the steps:
Raw material mixing step by mixing raw material, binding agent, dispersion agent, deionized water with the ratio of 500:10:2:1000 mixing Keep agitation 40-60 minute uniformly slip;
Break-in whipping step slip is put into colloidal mill and carries out wet-milling mixing, each component fully in dispersion slip, stirs 1 hour;
Drying step adopts spray-drying process to prepare function powder, and the intake air temperature of spray-drying tower is set to 160-170 DEG C, and air outlet temperature is set to 40-60 DEG C, and take away pump rotating speed is set to 800r/min, and spraying gun rotating speed is 17000--20000r/min; Slip is sent into spray-drying tower, can function powder be prepared; Its granularity of powder is no more than 50 μm;
Prepare and adopt sol-gel method outside coating, to prepare stannic oxide selectivity through film through film acid adjustment step, using anhydrous stannic chloride as Xi Yuan, dehydrated alcohol is as solvent, and initial soln concentration is 0.5mol/L, and adds appropriate Glacial acetic acid, and adjustment pH value is 4-5;
After substrate is preheated to 90-120 DEG C by spraying function powder step, spraying Ni-Al adhesive linkage; After being again cooled to 90-120 DEG C, spraying chromium aluminium Mn oxide function powder, thickness is 25-30 micron; Coating after clean spraying, prepares SnO 2 thin film in its surface; With 20mm/min speed lift film, dry 20min in 100 DEG C of-120 DEG C of baking ovens, then anneal film sample at 550 DEG C in retort furnace 2h-2.5h, prepares solar absorption compound coating.
The present invention's one has following beneficial effect compared with prior art based on chromium aluminium Mn oxide function powder solar absorption preparation method of composite coating: the function powder that the present invention adopts spray-drying process to prepare, possess good mobility, meet plasma spraying feeding requirement.
Coating specific absorption is greater than 0.89, and emittance is less than 0.06, and take out after 10 minutes with 600 DEG C of insulations in retort furnace, within 5 minutes, air cooling is to room temperature.After 100 thermal shocks, coating structure is complete, and do not come off variable color.High-temperature stability is good, and coating can be used on the solar energy collector under middle hot environment.
The present invention, relative to single (chromium sesquioxide) black chrome coating, possesses better solar selectively absorptive character.
The phase structure of coating, selective absorbing stable performance, be combined with matrix firmly, on performance and structure, all possesses good thermal shock resistance.
Embodiment
Below in conjunction with embodiment, the present invention's one is further described based on chromium aluminium Mn oxide function powder solar absorption preparation method of composite coating technical scheme.
The present invention is a kind of, and based on high temperature solar composite coating for absorbing preparation method in chromium aluminium Mn oxide function powder, described coating comprises following mixing raw material: chromium sesquioxide mass ratio 55%, the aluminium sesquioxide 35% of interpolation, tetrahydrate manganese chloride 10%; Binding agent is 1053 silicone resins, and dispersion agent is glycerol, and ratio is mixing raw material: binding agent: dispersion agent=500:10:2;
Described method comprises the steps:
Raw material mixing step by mixing raw material, binding agent, dispersion agent, deionized water with the ratio of 500:10:2:1000 mixing Keep agitation 40-60 minute uniformly slip;
Break-in whipping step slip is put into colloidal mill and carries out wet-milling mixing, each component fully in dispersion slip, stirs 1 hour;
Drying step adopts spray-drying process to prepare function powder, and the intake air temperature of spray-drying tower is set to 160-170 DEG C, and air outlet temperature is set to 40-60 DEG C, and take away pump rotating speed is set to 800r/min, and spraying gun rotating speed is 17000--20000r/min; Slip is sent into spray-drying tower, can function powder be prepared; Its granularity of powder is no more than 50 μm;
Prepare and adopt sol-gel method outside coating, to prepare stannic oxide selectivity through film through film acid adjustment step, using anhydrous stannic chloride as Xi Yuan, dehydrated alcohol is as solvent, and initial soln concentration is 0.5mol/L, and adds appropriate Glacial acetic acid, and adjustment pH value is 4-5;
After substrate is preheated to 90-120 DEG C by spraying function powder step, spraying Ni-Al adhesive linkage; After being again cooled to 90-120 DEG C, spraying chromium aluminium Mn oxide function powder, thickness is 25-30 micron; Coating after clean spraying, prepares SnO 2 thin film in its surface; With 20mm/min speed lift film, dry 20min in 100 DEG C of-120 DEG C of baking ovens, then anneal film sample at 550 DEG C in retort furnace 2h-2.5h, prepares solar absorption compound coating.
Embodiment 1.
Get 500g mixing raw material, mass ratio is chromium sesquioxide 55%, the aluminium sesquioxide of 35%, the tetrahydrate manganese chloride of 10%.
Get 10g1053 silicone resin, 2-3ml glycerol, 1000ml deionized water and the abundant mix and blend of mixing raw material 40 minutes.
Break-in whipping step slip is put into colloidal mill and carries out wet-milling mixing, each component fully in dispersion slip, stirs 1 hour;
Drying step adopts spray-drying process to prepare function powder, and the intake air temperature of spray-drying tower is set to 160 DEG C, and air outlet temperature is set to 40 DEG C, and take away pump rotating speed is set to 800r/min, and spraying gun rotating speed is 17000r/min; Slip is sent into spray-drying tower, can function powder be prepared; Its granularity of powder is no more than 50 μm;
Prepare and adopt sol-gel method outside coating, to prepare stannic oxide selectivity through film through film acid adjustment step, using anhydrous stannic chloride as Xi Yuan, dehydrated alcohol is as solvent, and initial soln concentration is 0.5mol/L, and adds appropriate Glacial acetic acid, regulates pH value to be 4;
After substrate is preheated to 90 DEG C by spraying function powder step, spraying Ni-Al adhesive linkage; After being again cooled to 90 DEG C, spraying chromium aluminium Mn oxide function powder, thickness is 25 microns; Coating after clean spraying, prepares SnO 2 thin film in its surface; With 20mm/min speed lift film, dry 20min in 100 DEG C of baking ovens, then anneal film sample at 550 DEG C in retort furnace 2h, prepares solar absorption compound coating.
Embodiment 2.
Get 500g mixing raw material, mass ratio is chromium sesquioxide 55%, the aluminium sesquioxide of 35%, the tetrahydrate manganese chloride of 10%.
Get 10g1053 silicone resin, 2-3ml glycerol, 1000ml deionized water and the abundant mix and blend .50 minute of mixing raw material.
Break-in whipping step slip is put into colloidal mill and carries out wet-milling mixing, each component fully in dispersion slip, stirs 1 hour;
Drying step adopts spray-drying process to prepare function powder, and the intake air temperature of spray-drying tower is set to 165 DEG C, and air outlet temperature is set to 50 DEG C, and take away pump rotating speed is set to 800r/min, and spraying gun rotating speed is 18500r/min; Slip is sent into spray-drying tower, can function powder be prepared; Its granularity of powder is no more than 50 μm;
Prepare and adopt sol-gel method outside coating, to prepare stannic oxide selectivity through film through film acid adjustment step, using anhydrous stannic chloride as Xi Yuan, dehydrated alcohol is as solvent, and initial soln concentration is 0.5mol/L, and adds appropriate Glacial acetic acid, regulates pH value to be 4.5;
After substrate is preheated to 105 DEG C by spraying function powder step, spraying Ni-Al adhesive linkage; After being again cooled to 90-120 DEG C, spraying chromium aluminium Mn oxide function powder, thickness is 28 microns; Coating after clean spraying, prepares SnO 2 thin film in its surface; With 20mm/min speed lift film, dry 20min in 110 DEG C of baking ovens, then anneal film sample at 550 DEG C in retort furnace 2.3h, prepares solar absorption compound coating.
Embodiment 3.
Get 500g mixing raw material, mass ratio is chromium sesquioxide 55%, the aluminium sesquioxide of 35%, the tetrahydrate manganese chloride of 10%.
Get 10g1053 silicone resin, 2-3ml glycerol, 1000ml deionized water and the abundant mix and blend of mixing raw material 60 minutes.
Break-in whipping step slip is put into colloidal mill and carries out wet-milling mixing, each component fully in dispersion slip, stirs 1 hour;
Drying step adopts spray-drying process to prepare function powder, and the intake air temperature of spray-drying tower is set to 170 DEG C, and air outlet temperature is set to 60 DEG C, and take away pump rotating speed is set to 800r/min, and spraying gun rotating speed is 20000r/min; Slip is sent into spray-drying tower, can function powder be prepared; Its granularity of powder is no more than 50 μm;
Prepare and adopt sol-gel method outside coating, to prepare stannic oxide selectivity through film through film acid adjustment step, using anhydrous stannic chloride as Xi Yuan, dehydrated alcohol is as solvent, and initial soln concentration is 0.5mol/L, and adds appropriate Glacial acetic acid, regulates pH value to be 5;
After substrate is preheated to 120 DEG C by spraying function powder step, spraying Ni-Al adhesive linkage; After being again cooled to 120 DEG C, spraying chromium aluminium Mn oxide function powder, thickness is 30 microns; Coating after clean spraying, prepares SnO 2 thin film in its surface; With 20mm/min speed lift film, dry 20min in 120 DEG C of baking ovens, then anneal film sample at 550 DEG C in retort furnace 2.5h, prepares solar absorption compound coating.