CN105543764B - It is a kind of for infra-red radiation metal ceramic powder of detonation flame spraying and preparation method thereof - Google Patents
It is a kind of for infra-red radiation metal ceramic powder of detonation flame spraying and preparation method thereof Download PDFInfo
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- CN105543764B CN105543764B CN201510996342.8A CN201510996342A CN105543764B CN 105543764 B CN105543764 B CN 105543764B CN 201510996342 A CN201510996342 A CN 201510996342A CN 105543764 B CN105543764 B CN 105543764B
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Abstract
The invention discloses a kind of infra-red radiation metal ceramic powders for detonation flame spraying, are formulated by the material of following mass ratio：Cobalt powder：CoMn2O4Powder：Bonding agent=9~25：75~91：10~20；Wherein：The CoMn2O4Powder has spinel structure, and the solid powder example in mass ratio by CoO and MnO of the average grain diameter less than 75 μm is 1：2 are prepared.The invention also provides a kind of preparation methods of infra-red radiation metal ceramic powder.Infra-red radiation cermet powder provided by the invention, the coating deposited using detonation flame spraying method in metal surface have excellent infrared radiation property.For heat-exchanger surfaces such as electronic package material radiator and boiler water-wall tubes, according to the difference of environment temperature, heat can be radiated or absorbed rapidly by the thermaltransmission mode of infra-red radiation, improve heat exchanger effectiveness.
Description
Technical field
The present invention relates to new material technology fields, and in particular to a kind of infra-red radiation Metal-ceramie powder for detonation flame spraying
End and preparation method thereof.
Background technology
It is well known that heat transfer is to conduct, convection current and radiation three kinds in a manner of carry out.Wherein radiant heat transfer has speed
Soon, the advantages such as medium are not required.Instantly, due to electronic package material, such as large LED lamp, the problem of heat dissipation due to it, become
The huge obstacle of electronic industry development, at present mainly by installing fin increasing heat radiation area additional and being increased using pressure cooling fan
Add conduction and heat loss through convection rate.On the other hand, for the boiler in industrial heating furnace, what water screen tube side towards the fire absorbed
The heat that heat is transferred essentially from furnace wall radiation mode, then mainly in a manner of radiation and heat transfer and inside water screen tube
Flowing water carries out heat exchange.Boiler energy-saving transformation at present mainly improves the heat-insulating property of furnace wall refractory to reduce heat
Amount loss, and the effect in terms of boiler water-wall tube directly participates in furnace heat transfer and its surface emissivity performance are ignored to being passed in stove
Heat and the influence of heat exchange.In addition, the infrared radiation property of metal material be far below refractory material, and with the close phase of surface appearance
It closes.The blackness of boiler water-wall tube how is effectively improved, passes through the conduction of strengthening surface radiant heat transfer and raising water screen tube
Exchange capability of heat is by the heating-up time for effectively shortening boiler and reduces smoke exhaust heat loss, is to improve boiler heat-energy transfer efficiency
Important channel.Realize that the infra-red radiation cladding material of engineer application is mainly organic by the addition of infra-red radiation powder both at home and abroad at present
Or inorganic adhesive is made into coating, and substrate surface is coated on by modes such as spraying, roller coat or brushings.Due to adhesives in itself
Thermal resistance it is big, be decreased obviously the heat exchange effect of coating.
The content of the invention
The technical issues of present invention is poor for the infra-red radiation cladding material heat exchange performance of existing engineer application proposes one
Kind is for infra-red radiation metal ceramic powder of detonation flame spraying and preparation method thereof.
Infra-red radiation metal ceramic powder proposed by the present invention for detonation flame spraying is matched somebody with somebody by the material of following mass ratio
It makes：
Cobalt powder：CoMn2O4Powder：Bonding agent=9~25：75~91：10~20；
Wherein：The CoMn2O4Powder has spinel structure, by the solid of CoO and MnO of the average grain diameter less than 75 μm
Powder example in mass ratio is 1：2 are prepared.
The invention also provides a kind of preparation methods of infra-red radiation metal ceramic powder, and its step are as follows：
Step 1：CoMn2O4The preparation of infrared radiation ceramic material
CoO the and MnO solid powders having stable high-temperature performance is selected uniformly to mix in proportion, are cold-pressed with water spray humidification powder
Green body is made, in 1100 DEG C~1150 DEG C high temperature sintering 2h, takes out and carries out quenching treatment, is crushed after natural drying and levigate to 30
Below μm, the CoMn with stable spinel structure is made2O4Infrared radiation ceramic material；
Step 2：The preparation of infra-red radiation metal ceramic powder
By cobalt powder, CoMn2O4Powder and bonding agent uniformly mix in proportion, and reunion powder is made in mist projection granulating, in N2Protect gas
It is high temperature Fast Sintering under atmosphere, air-cooled, it crushes, after screening, obtains the spherical infra-red radiation metal ceramic powder for detonation flame spraying
Material, grain size are 15~45 μm.
Compared with prior art, advantages of the present invention：
（1）It is preferred that rapid quenching after CoO the and MnO solid powder high temperature sinterings of stable performance under high temperature, can prepare crystalline substance
Grain is tiny and has the CoMn of stable spinel structure2O4Infrared radiation ceramic material.All band spoke of the material at 1~25 μm
Rate is penetrated steadily in the long term more than 0.9, is remarkably improved the heat exchange efficiency of coating.
（2）The thermal conductivity of metal Co is 100W/ (mK), far above silicate inorganic bonding agent 1.41W/ (mK) and is had
0.2 W/ of machine bonding agent (mK), is remarkably improved the heat exchange of conduction pattern between coating and base material.Have in coating and stablize
The CoMn of spinel structure2O4With excellent infrared emanation performance.If coating temperature is higher than environment, hot spoke can be passed through
The form rapid cooling penetrated；If environment temperature is higher than Coated Surface Temperature, radiant heat is quickly absorbed with the efficiency of Proximate blackbody
Amount improves substrate material surface temperature.Compared with traditional organic and inorganic adhesive, can reduce since binding material introducing is led
The defects of pyrogenicity resistance increases.And infra-red radiation metal ceramic powder provided by the invention, the painting prepared with detonation flame spraying mode
Layer is very fine and close, and the porosity is less than 1%, can reduce in coating since sealed porosity causes the increased probability of material thermal resistance；It is and quick-fried
Fried spraying since particle rapidity is up to 800m/s, sufficiently flatization when particle hits base material, coating layer thickness minimum can be controlled in 3~
It 5 μm, can further reduce since coating layer thickness increases the adverse effect to conducting heat exchanger effectiveness.Pass through detonation flame spraying side with it
The coating of formula deposition is substantially better than traditional infrared radiation coating material.
（3）Since powder grain is tiny and with stable spinel structure, uses CoMn2O4Infra-red radiation cermet powder
There is high radiation, high-selenium corn using the coating of detonation flame spraying process deposits.Coating absorbs heat from environment before this, such as
Fruit coating temperature is higher than environment, can pass through the form rapid cooling of heat radiation.Its typical case is the electricity such as solution large LED lamp
The problem of sub- encapsulating material heat dissipation；If environment temperature is higher than Coated Surface Temperature, spoke is quickly absorbed with the efficiency of Proximate blackbody
Heat is penetrated, improves substrate material surface temperature.Its typical case improves water to increase boiler water-wall tube radiant heat absorbent rate
Conduction heat-exchange capacity and burner hearth utilization efficiency of heat energy between cold wall pipe and water reduce the heat loss due to exhaust gas of high-temperature flue gas.
Description of the drawings
Fig. 1 is the infra-red radiation cermet powder electron scanning micrograph prepared using the present invention.
Specific embodiment
Fig. 1 shows the infra-red radiation cermet powder microscopic structure of the present invention.It is proposed by the present invention to be used to explode
The infra-red radiation metal ceramic powder of spraying, is formulated by the material of following mass ratio：
Cobalt powder：CoMn2O4Powder：Bonding agent=9~25：75~91：10~20；
Wherein：The CoMn2O4Powder has spinel structure, by the solid of CoO and MnO of the average grain diameter less than 75 μm
Powder example in mass ratio is 1：2 are prepared.With reference to embodiment, the invention will be further described.
Embodiment 1:
It is 1 by its mass ratio by CoO the and MnO powder that average grain diameter is 20 μm:2 are uniformly mixed, and are added in total
The water of body powder quality 5% humidifies powder using spray pattern, and the green body that size is 50mm × 30mm × 10mm is made in cold pressing.It will
For green body in 1100 DEG C of high temperature sintering 2h, taking-up carries out quenching treatment into the water, crushed after natural drying and levigate to 20 μm with
Under obtain the CoMn with stable spinel structure2O4Infrared radiation ceramic material.
Then by cobalt powder of the average grain diameter for 0.1 μm, CoMn2O4Powder and polyethylene glycol 2000 are 25 in mass ratio:75:15
It is uniformly mixed, reunion powder is made in mist projection granulating, in N2It is the lower 1200 DEG C of Fast Sinterings of protective atmosphere, air-cooled, it crushes, after screening
To the spherical infra-red radiation metal ceramic powder for detonation flame spraying, grain size is 15~38 μm.
Using detonation flame spraying technique, in thermoelectricity industry BG-75/39-MI 75 tons of pulverized-coal fired boilers of type, material 20#The water of steel
Cold wall pipe deposited on surface of heat exchanger coating layer thickness is about 20 μm, saving coals from boiler more than 7%, and exhaust gas temperature is by 172 DEG C of original drops
Low is 148 DEG C.
Embodiment 2:
It is 1 by its mass ratio by CoO the and MnO powder that average grain diameter is 60 μm:2 are uniformly mixed, and are added in overall
The water of powder quality 5% humidifies powder using spray pattern, and the green body that size is 50mm × 30mm × 10mm is made in cold pressing.By base
Body carries out quenching treatment into the water in 1150 DEG C of high temperature sintering 2h, taking-up, is crushed after natural drying and levigate to less than 30 μm
Obtain the CoMn with stable spinel structure2O4Infrared radiation ceramic material.Then by average grain diameter be 0.5 μm cobalt powder,
CoMn2O4Powder and 2% hydroxymethyl cellulose aqueous solution are 9 in mass ratio:91:10 are uniformly mixed, and reunion powder is made in mist projection granulating
End, in N2It is the lower 1200 DEG C of Fast Sinterings of protective atmosphere, air-cooled, it is broken, the infrared spoke of spherical shape for detonation flame spraying is obtained after screening
Metal ceramic powder is penetrated, grain size is 15~45 μm.
Using detonation flame spraying technique, the coating that deposition thickness is about 10 μm on LED light heat-radiating substrate surface, since coating can
The heat of quick absorptive substrate simultaneously carries out heat exchange with radiation mode and natural environment, and radiating efficiency improves more than 45%, instead of
After original radiator fan and reduce substrate heat dissipation area more than 10%.
Embodiment 3:
It is 1 by its mass ratio by CoO the and MnO powder that average grain diameter is 40 μm:2 are uniformly mixed, and are added in total
The water of body powder quality 5% humidifies powder using spray pattern, and the green body that size is 50mm × 30mm × 10mm is made in cold pressing.It will
For green body in 1130 DEG C of high temperature sintering 2h, taking-up carries out quenching treatment into the water, crushed after natural drying and levigate to 20 μm with
Under, obtain the CoMn with stable spinel structure2O4Infrared radiation ceramic material.Then it is 0.3 μm of cobalt by average grain diameter
Powder, CoMn2O4Powder and 15% 1799 aqueous solution of polyvinyl alcohol are 17 in mass ratio:83:20 are uniformly mixed, and group is made in mist projection granulating
Poly powder, in N2It is the lower 1200 DEG C of Fast Sinterings of protective atmosphere, air-cooled, the spherical infra-red radiation for detonation flame spraying is obtained after screening
Metal ceramic powder, grain size are 15~38 μm.
Using detonation flame spraying technique, in pharmaceutical industry DZL4-1.25-AII (SW) type Horizontal type packaged chain grate coal dust pot
Stove, material 20#The water screen tube deposited on surface of heat exchanger thickness of steel is about 10 μm of coatings, and saving coals from boiler more than 12% is discharged fume
Temperature is reduced to 164 DEG C by original 230 DEG C, and the thermal efficiency improves 4%.
The foregoing is merely illustrative of the preferred embodiments of the present invention, however it is not limited to this, it is all in the spirit and principles in the present invention
Within all any modification, equivalent and improvement made etc., should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of preparation method of infra-red radiation metal ceramic powder for detonation flame spraying, its step are as follows：
Step 1：CoMn2O4The preparation of infrared radiation ceramic material
CoO the and MnO solid powders having stable high-temperature performance is selected uniformly to mix in proportion, are made of water spray humidification powder cold pressing
Green body, in 1100 DEG C~1150 DEG C high temperature sintering 2h, takes out and carries out quenching treatment, crushed after natural drying and levigate to 30 μm with
Under, the CoMn with stable spinel structure is made2O4Infrared radiation ceramic material；
Step 2：The preparation of infra-red radiation metal ceramic powder
By cobalt powder, CoMn2O4Powder and bonding agent uniformly mix in proportion, and reunion powder is made in mist projection granulating, in N2Under protective atmosphere
It is high temperature Fast Sintering, air-cooled, the spherical infra-red radiation Metal-ceramie powder powder material for detonation flame spraying is obtained after broken, screening,
Grain size is 15~45 μm；
Wherein：
The infra-red radiation metal ceramic powder for detonation flame spraying is formulated by the material of following mass ratio：
Cobalt powder：CoMn2O4Powder：Bonding agent=9~25：75~91：10~20；
The CoMn2O4Powder has spinel structure, and quality is pressed by the solid powder of CoO and MnO of the average grain diameter less than 75 μm
Ratio is 1：2 are prepared.
2. preparation method as described in claim 1, it is characterised in that：In the step 1, when humidifying powder with water spray, add
Enter the water of the CoO and MnO powder qualities 5%, the size that the green body is made in cold pressing is 50mm × 30mm × 10mm.
3. preparation method as described in claim 1, it is characterised in that：The cobalt powder be submicron order cobalt powder, average grain diameter
Less than 0.5 μm.
4. preparation method as described in claim 1, it is characterised in that：The bonding agent be average molecular weight be 2000 it is poly-
One kind of ethylene glycol, 2% hydroxymethyl cellulose aqueous solution or 15% 1799 aqueous solution of polyvinyl alcohol.
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| CN105951029A (en) * | 2016-06-20 | 2016-09-21 | 新昌县七星街道明盛模具厂 | Production process of protecting coating of explosion spraying high-temperature furnace roller |
| CN107445464A (en) * | 2017-09-04 | 2017-12-08 | 咸宁南玻节能玻璃有限公司 | A kind of Low emissivity tempering live-roller gear |
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| CN103788849A (en) * | 2012-11-01 | 2014-05-14 | 深圳市润物科技有限公司 | Low-carbon energy-saving coating |
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| CN103788849A (en) * | 2012-11-01 | 2014-05-14 | 深圳市润物科技有限公司 | Low-carbon energy-saving coating |
Non-Patent Citations (1)
| Title |
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| 高发射率红外辐射涂料的制备与性能研究;税安泽等;《人工晶体学报》;20100831;第39卷(第4期);第1009页2实验、3.1XRD分析及1010页3.2SEM分析 * |
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