CN103204702A - Method for spraying coloring film on surface of ferrite magnet - Google Patents
Method for spraying coloring film on surface of ferrite magnet Download PDFInfo
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- CN103204702A CN103204702A CN2013100119425A CN201310011942A CN103204702A CN 103204702 A CN103204702 A CN 103204702A CN 2013100119425 A CN2013100119425 A CN 2013100119425A CN 201310011942 A CN201310011942 A CN 201310011942A CN 103204702 A CN103204702 A CN 103204702A
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Abstract
The invention provides a method for spraying a coloring film on the surface of a ferrite magnet. The method can realize reduction in cracking and achievement of a compact state through improvement of thermal conduction. The method comprises the following steps: (1) taking roasted ferrite powder containing alumina and sintering the roasted ferrite powder at a temperature of 1000 to 13000 DEG C to allow sintered density of the ferrite powder to reach 4.7 to 4.9 g/cm<3>; (2) cooling a sintered body obtained in step (1), heating the sintered body to a temperature of 260 to 300 DEG C in 6 to 10 min, maintaining the temperature for 4 to 6 min and dipping the sintered body in flowing film powder; and (3) after the sintered body dipped in the film powder melts and forms a film, immediately taking the sintered body out and cooling the sintered body in cold water with a temperature of 10 DEG C so as to obtain a finished product.
Description
Technical field
The present invention relates to a kind of method of material surface spray colouration film, relate to a kind of method at ferrite magnetic iron surface spray colouration rete especially.
Background technology
Ferrite magnet has ceramic peculiar friability, and color is black, has the black powder can transfer to the first-class shortcoming of contactant, the processing of need filming during the ferrite magnet equipment that directly catches tactile that therefore uses in office, teaching.
The present invention this by to being coated with membrane means research in a large number, find that the demagnetize degree is minimum in thickness 100 μ m to 600 mu m ranges.Film when but generally adopting the powder spraying method and all can produce bubble, or problem such as be full of cracks takes place, coated surface be processed beautiful extremely difficult.The powder spraying method is divided into electrostatic spraying and slipper dip method two big classes, once carries out the bubble of slipper dip method generation after the heating seldom.The reason that bubble produces is owing to being closed in the interior gas of filming along with intensification is afterwards expanded.So just understood the reason that bubble produces, the reason of be full of cracks then is because rapid heating power changes.Though but for being coated with film quality, raising carried out relevant research to being coated with membrane processing method, and still not enough for the research of material itself.Be unknown fully for the relevant membrane material that is coated with of ferrite magnet particularly, relaxing the be full of cracks that causes because of thermal shocking needs the porousness sintered compact, and namely the state of acceleration of sintering densification is not good; Prevent that bubble from producing then is that state with fine and close as far as possible is good, and these two conditions are opposite, therefore still do not have at present the fine method that overcomes the above problems.
Summary of the invention
The inventor studies intensively repeatedly at the problems referred to above, has found a kind of method at ferrite magnetic iron surface spray colouration rete, and this method can reach the effect that not only reduces be full of cracks but also can reach fine and close state by improving thermal conduction.This method may further comprise the steps:
(1) get salic ferrite powders calcined, sintering makes its sintered density reach 4.7 to 4.9g/cm in 1000 ℃ to 13000 ℃ scopes
3
(2) with after the sintered compact cooling that obtains in the step (1), within 6～10 minutes, be warming up to 260～300 ℃, and kept this temperature 4～6 minutes, this sintered compact is impregnated in the mobile powder of filming then;
(3) after sintered compact floods in the powder of filming and treats that powder melts film forming, place 10 ℃ cold water to cool off the sintered compact taking-up immediately, thereby make finished product.
Preferably, the powders calcined described in the above-mentioned steps (1) is selected strontium ferrites powders calcined or barium ferrite powders calcined for use.
Preferably, the ferritic sintered density described in the above-mentioned steps (1) is 4.75～4.9g/cm
3
Preferably, the powder of filming described in the above-mentioned steps (2) is nylon 12.
Preferably, the time that sintered compact floods in the powder of filming in the above-mentioned steps (3) is 3～5 seconds.
Preferably, the thickness of filming that forms in the above-mentioned steps (3) is 100～600 μ m.
Preferably, in the above-mentioned steps (1) the ferritic size of sintering 30 millimeters * 30 millimeters * below 30 millimeters.
Preferably, when the ferritic size of sintering was greater than 30 millimeters * 30 millimeters * 30 millimeters in the step (1), the heating-up time in the step (2) was adjusted into 12～20 minutes, and the water coolant water temperature of using in the step (3) is adjusted into 35 ℃.
The emphasis of method provided by the invention is the numerical range that experiment draws through repeated multiple times, when ferritic density is lower than 4.75g/cm
3The time be full of cracks and the bubble of filming will significantly increase, and ferritic density is lower than 4.7g/cm
3The time be full of cracks of filming and bubble will further significantly increase.And the reason that adopts 100 μ m to 600 μ m powder spraying film thicknesses is since the words magnet of less than 100 μ m when repelling mutually demagnetize will become greatly, and will die down above the words power of attracting each other of 600 μ m.
Embodiment
Embodiment 1
The strontium ferrites powders calcined of salic 0.2 weight % is made 23 millimeters * 10 millimeters * 8 millimeters specification, and sintering makes it sintered density and reaches 4.6 to 4.9g/cm in 1100 ℃ to 1150 ℃ scopes then
3With the density of this sintered compact with 0.05g/cm
3The interval, divide 6 levels to carry out application by the slipper dip method.At first heated up 8 minutes to 280 ℃, and under 280 ℃, after 5 minutes, be impregnated in the flowing powder of nylon 12, about 4 second powder melt and in 10 ℃ of water, carry out water cooling immediately after the film forming and make finished product.
By the generation state of the bubble that chaps, films this moment is investigated, sum up number of non-compliances and passing number, obtain table 1.
Table 1 sintered density is divided coating film situation (containing counting by be full of cracks of be full of cracks and bubble simultaneously)
| Sintered density g/cm 3 | Handle quantity | Be full of cracks quantity | Number of bubbles | Qualified quantity |
| 4.85～4.89 | 105 | 0 | 0 | 105 |
| 4.80～4.84 | 110 | 0 | 0 | 110 |
| 4.75～4.79 | 113 | 0 | 7 | 107 |
| 4.70～4.74 | 104 | 2 | 45 | 57 |
| 4.65～4.69 | 108 | 8 | 62 | 38 |
| 4.60～4.64 | 103 | 5 | 80 | 18 |
Embodiment 2
The strontium ferrites powders calcined of salic 0.2 weight % is made the specification of 60 millimeters * 40 millimeters * 30 millimeters of external diameters, and sintering makes it sintered density and reaches 4.6 to 4.9g/cm in 1100 ℃ to 1150 ℃ scopes then
3With the density of this sintered compact with 0.05g/cm
3The interval, divide 6 levels to carry out application by the slipper dip method.At first heated up 20 minutes to 280 ℃, and under 280 ℃, after 5 minutes, be impregnated in the flowing powder of nylon 12, about 4 second powder melt and in 35 ℃ of water, carry out water cooling immediately after the film forming and make finished product.
By the generation state of the bubble that chaps, films this moment is investigated, sum up number of non-compliances and passing number, obtain table 1.
Table 1 sintered density is divided coating film situation (containing counting by be full of cracks of be full of cracks and bubble simultaneously)
| Sintered density g/cm 3 | Handle quantity | Be full of cracks quantity | Number of bubbles | Qualified quantity |
| 4.85～4.89 | 113 | 0 | 0 | 113 |
| 4.80～4.84 | 106 | 0 | 0 | 106 |
| 4.75～4.79 | 121 | 1 | 5 | 115 |
| 4.70～4.74 | 112 | 3 | 42 | 67 |
| 4.65～4.69 | 106 | 5 | 55 | 46 |
| 4.60～4.64 | 102 | 8 | 84 | 10 |
Embodiment 3
Change the ferrite powder particle diameter into 0.6～1.1 μ m, the barium ferrite powders calcined of salic 0.3 weight % is made the shape of 20 millimeters * 8 millimeters * 8 millimeters of external diameters, and sintering makes it sintered density and reaches 4.6 to 4.9g/cm in 1050 ℃ to 1100 ℃ scopes then
3With the density of this sintered compact with 0.05g/cm
3The interval, divide 6 levels to carry out application by the slipper dip method.At first heated up 8 minutes to 270 ℃, and under 270 ℃, after 5 minutes, be impregnated in the flowing powder of nylon 12, about 4 second powder melt and in 10 ℃ of water, carry out water cooling immediately after the film forming and make finished product.
By the generation state of the bubble that chaps, films this moment is investigated, sum up number of non-compliances and passing number, obtain table 1.
Table 1 sintered density is divided coating film situation (containing counting by be full of cracks of be full of cracks and bubble simultaneously)
| Sintered density g/cm 3 | Handle quantity | Be full of cracks quantity | Number of bubbles | Qualified quantity |
| 4.85～4.89 | 101 | 0 | 0 | 101 |
| 4.80～4.84 | 106 | 0 | 1 | 105 |
| 4.75～4.79 | 111 | 0 | 6 | 105 |
| 4.70～4.74 | 114 | 3 | 38 | 67 |
| 4.65～4.69 | 102 | 6 | 64 | 32 |
| 4.60～4.64 | 104 | 7 | 77 | 20 |
Those skilled in the art can make replacement or modification to content of the present invention according to content disclosed by the invention and the art technology of grasping; but these replacements or modification should not be considered as breaking away from the present invention's design, and these replacements or modification are all in the claimed interest field of the present invention.
Claims (7)
1. method at ferrite magnetic iron surface spray colouration rete, this method may further comprise the steps:
(1) get salic ferrite powders calcined, sintering makes its sintered density reach 4.7 to 4.9g/cm in 1000 ℃ to 13000 ℃ scopes
3
(2) with after the sintered compact cooling that obtains in the step (1), within 6～10 minutes, be warming up to 260～300 ℃, and kept this temperature 4～6 minutes, this sintered compact is impregnated in the mobile powder of filming then;
(3) after sintered compact floods in the powder of filming and treats that powder melts film forming, place 10 ℃ cold water to cool off the sintered compact taking-up immediately, thereby make finished product.
2. the method at ferrite magnetic iron surface spray colouration rete described in the claim 1 is characterized in that the powders calcined described in the step (1) selects strontium ferrites powders calcined or barium ferrite powders calcined for use.
3. the method at ferrite magnetic iron surface spray colouration rete described in the claim 1 is characterized in that the powder of filming described in the step (2) is nylon 12.
4. the method at ferrite magnetic iron surface spray colouration rete described in the claim 1 is characterized in that the time that sintered compact floods in the step (3) is 3～5 seconds in the powder of filming.
5. the method at ferrite magnetic iron surface spray colouration rete described in the claim 1 is characterized in that the thickness of filming that forms in the step (3) is 100～600 μ m.
6. the method at ferrite magnetic iron surface spray colouration rete described in the claim 1, the ferritic size that it is characterized in that the sintering described in the step (1) 30 millimeters * 30 millimeters * below 30 millimeters.
7. the method at ferrite magnetic iron surface spray colouration rete described in the claim 1, the ferritic size that it is characterized in that sintering in the step (1) is during greater than 30 millimeters * 30 millimeters * 30 millimeters, heating-up time in the step (2) is adjusted into 12～20 minutes, and the water coolant water temperature of using in the step (3) is adjusted into 35 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310011942.5A CN103204702B (en) | 2013-01-14 | 2013-01-14 | Method for spraying coloring film on surface of ferrite magnet |
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| CN201310011942.5A CN103204702B (en) | 2013-01-14 | 2013-01-14 | Method for spraying coloring film on surface of ferrite magnet |
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| CN103204702A true CN103204702A (en) | 2013-07-17 |
| CN103204702B CN103204702B (en) | 2015-01-07 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101577178A (en) * | 2009-03-23 | 2009-11-11 | 兰州大学 | Preparation method of ferrite magnetic film |
| JP4754002B2 (en) * | 2009-03-02 | 2011-08-24 | 三菱電機株式会社 | Carbon aggregate molded material and method for producing carbon aggregate molded article |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4754002B2 (en) * | 2009-03-02 | 2011-08-24 | 三菱電機株式会社 | Carbon aggregate molded material and method for producing carbon aggregate molded article |
| CN101577178A (en) * | 2009-03-23 | 2009-11-11 | 兰州大学 | Preparation method of ferrite magnetic film |
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