CN1206204A - New electromagnetic wave absorbing material and its preparation - Google Patents
New electromagnetic wave absorbing material and its preparation Download PDFInfo
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- CN1206204A CN1206204A CN 97108989 CN97108989A CN1206204A CN 1206204 A CN1206204 A CN 1206204A CN 97108989 CN97108989 CN 97108989 CN 97108989 A CN97108989 A CN 97108989A CN 1206204 A CN1206204 A CN 1206204A
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Abstract
The electromagnetic wave absorbing material consists of ferrimagnetic material as main component and additive comprising Zn, Co, Cu, Mg, Cr and V, and it is prepared through the steps of mixing, pre-sintering, ball milling, heat treatment and crushing. The material may be used to produce electromagnetic wave absorbing chip through refining, grinding and pressing, sulfurizing and forming. It has very strong absorption to 600-5000 MHz electromagnetic wave so that it can be used to prevent electromagnetic radiation harmfulness to body and the effect to equipment of electromagnetic wave in different electromagnetic field environment.
Description
The invention belongs to technical field of magnetic materials.
Along with human production activity's continuous development, the continuous progress of industrial civilization, the electromagnetic radiation (pollution) that each class of electronic devices, information, terminal, communication system etc. cause is more and more many, more and more strong, becomes the public hazards of global range gradually.This electromagnetic radiation (pollution) is extensively confirmed by medical circle institute the harm of human body, the reliability and the accuracy of all types of industries equipment is also brought tangible influence.How to protect electromagnetic radiation (pollution) effectively and become the important topic of global scientific and technological circle.People discover that decay will appear in electromagnetic wave when propagating in ferrite magnetic material, and this is decayed mainly from magnetic loss.When we are optimized design and control process conditions by precision crystal structure, chemical composition, microstructure and the overall dimension of ferrite magnetic material, just can make the electromagnetic material of a kind of absorption, can realize absorption of electromagnetic wave in certain frequency band range, this mainly is the coupling of electromagnetic wave energy by SPIN LATTICE to be passed to ferrite magnetic material distribute with the heat energy form, thereby realizes absorbing electromagnetic wave.Introduce according to " magnetisable material and device " (electronics industry information network periodical),, generally can only absorb the electromagnetic wave of frequency range more than 8000 megahertzes from existing absorbing material.And extensively be present in daily life and the work less than the low-frequency range electromagnetic wave of 5000 megahertzes, bigger to human body harm, still there is not a kind of material can absorb the electromagnetic wave of this frequency range effectively at present.
The purpose of this invention is to provide a kind of novel electromagnetic wave absorbent material and manufacture method thereof, and the wafer of making by this new electromagnetic wave absorbing material, this material has stronger microwave absorbing property in 600～5000 megahertz frequency ranges.
The object of the present invention is achieved like this: a kind of new electromagnetic wave absorbing material, it is characterized in that, and mainly form by ferrite magnetic material, also include zinc, cobalt and additive.
Described new electromagnetic wave absorbing material is made up of the iron of 40～60% weight ratios, the zinc of 10～30% weight ratios, the cobalt of 10～30% weight ratios.
Described new electromagnetic wave absorbing material also includes Additive Cu, magnesium, chromium, vanadium.
Described additive is made up of the copper of 1～3% weight ratio, the magnesium of 2～8% weight ratios, the chromium of 1～3% weight ratio, the vanadium of 1～5% weight ratio.
Another object of the present invention is achieved in that a kind of manufacture method of new electromagnetic wave absorbing material, may further comprise the steps: prescription, strong mix, pre-burning, ball milling, heat treatment, pulverizing, it is characterized in that, Main Ingredients and Appearance is 40～60% iron, 10～30% zinc, 10～30% cobalt in the prescription, and additive is 1～3% copper, 2～8% magnesium, 1～3% chromium, 1～5% vanadium; Add disperse means water and ethanol during strong mixing, incorporation time is 2～6 hours; Pre-burning, temperature is 700～1180 ℃ in air, sintering time is 1～4 hour; Add disperse means water and ethanol during ball milling, the ball milling time is 2～12 hours; Heat treatment, temperature is 1100～1500 ℃ in a vacuum, sintering time is 1～5 hour; Pulverize, pulverize with Hubei Province formula.
The wafer that new electromagnetic wave absorbing material of the present invention is made is with the logical rolled-to-death rubber of the powder of above-mentioned absorbing material, grinds pressure, sulfuration, moulding and form.
Described refining glue be the absorbing material powder that will crush with rubber ratio by (6～9): mix (4～1), and rolled 1～10 hour, reaches full and uniform mixing; Temperature is 140 ℃～220 ℃ during sulfuration, and the time kept 10～50 minutes; Moulding is that the material with vulcanizing treatment strikes out the suction quarter wave plate 14.
The invention has the advantages that: owing to adopted novel wave-absorbing material, the electromagnetic wave of 600～5000 megahertz frequency ranges is had extremely strong microwave absorbing property, under the strong environment of different electromagnetic field, prevented that electromagnetic radiation is to the harm of human body with to the influence of equipment.Electromagenetic wave radiation adopts the spatial field method to record to this material the time, and attenuation rate is＞99%, and transmitance is＜1%; At centre frequency 3500 megahertz places, absorptivity reaches 93.7%, and reflectivity is 6.3%.
The present invention is further illustrated below in conjunction with embodiment.
The present invention is a kind of new electromagnetic wave absorbing material and manufacture method thereof, described new electromagnetic wave absorbing material mainly is made up of ferrite magnetic material, its prescription mainly is made up of the iron of 45% weight ratio, the zinc of 25% weight ratio, the cobalt of 21% weight ratio, also include additive, form by the copper of 3% weight ratio, the magnesium of 2% weight ratio, the chromium of 2% weight ratio, the vanadium of 2% weight ratio.Specifically, prepare 1 kilogram of described absorbing material, in ratio is as follows with the assay balance weighing as mentioned above: iron: 450 grams, zinc: 250 grams, cobalt: 210 grams, copper: 30 grams, magnesium: 20 grams, chromium: 20 grams, vanadium: 20 grams.
The manufacture method of described electromagnetic wave absorbent material may further comprise the steps: prescription, strong mix, pre-burning, ball milling, heat treatment, pulverizing.Specifically, Main Ingredients and Appearance is 45% iron, 25% zinc, 21% cobalt in the prescription, and additive is 3% copper, 2% magnesium, 2% chromium, 2% vanadium; Add disperse means water 200 grams and ethanol 300 grams during strong mixing, put into ball mill and mixed 5 hours; Pre-burning is to be 1000 ℃ with above-mentioned mixed powder temperature in air, sintering 3 hours; Add disperse means water 100 grams and ethanol 200 grams during ball milling, pre-burned piece pellet was ground 11 hours; Heat treatment be with the powder of ball milling in a vacuum temperature be 1380 ℃, carry out heat treatment in 4 hours; Pulverizing is that the piece material that heat treatment is good is pulverized with Hubei Province formula, is crushed to till 80 mesh sieves.
The wafer that new electromagnetic wave absorbing material is made is with the logical rolled-to-death rubber of the powder of above-mentioned absorbing material, grinds pressure, sulfuration, moulding and form.Refining glue: the absorbing material powder that crushes mixes by 9: 1 with rubber ratio, and rolls 10 hours, reaches full and uniform mixing; Sulfuration: 200 ℃ of temperature, the time keeps carrying out in 50 minutes vulcanizing treatment; Moulding: the material of vulcanizing treatment is struck out the suction quarter wave plate 14.
New electromagnetic wave absorbing material of the present invention has extremely strong microwave absorbing property to the electromagnetic wave of 600～5000 megahertz frequency ranges, and electromagenetic wave radiation adopts the spatial field method to record to this material the time, and attenuation of electromagnetic wave is＞99%, and transmitance is＜1%; At centre frequency 3500 megahertz places, absorptivity reaches 93.7%, and reflectivity is 6.3%.
Claims (20)
1, a kind of new electromagnetic wave absorbing material is characterized in that, mainly is made up of ferrite magnetic material, also includes zinc, cobalt and additive.
2, new electromagnetic wave absorbing material according to claim 1 is characterized in that, contains the iron of 40～60% weight ratios in the described absorbing material.
3, new electromagnetic wave absorbing material according to claim 1 is characterized in that, contains the zinc of 10～30% weight ratios in the described absorbing material.
4, new electromagnetic wave absorbing material according to claim 1 is characterized in that, contains the cobalt of 10～30% weight ratios in the described absorbing material.
5, new electromagnetic wave absorbing material according to claim 1 is characterized in that, described additive is made up of copper, magnesium, chromium, vanadium.
6, additive according to claim 5 is characterized in that, the copper of 1～3% weight ratio is arranged in the described additive.
7, additive according to claim 5 is characterized in that, the magnesium of 2～8% weight ratios is arranged in the described additive.
8, additive according to claim 5 is characterized in that, the chromium of 1～3% weight ratio is arranged in the described additive.
9, additive according to claim 5 is characterized in that, is made up of the vanadium of 1～5% weight ratio in the described additive.
10, a kind of manufacture method of new electromagnetic wave absorbing material is characterized in that, may further comprise the steps: prescription, strong mix, pre-burning, ball milling, heat treatment, pulverizing.
11, the manufacture method of new electromagnetic wave absorbing material according to claim 10, it is characterized in that, described prescription: Main Ingredients and Appearance is 40～60% iron, 10～30% zinc, 10～30% cobalt, and additive is 1～3% copper, 2～8% magnesium, 1～3% chromium, 1～5% vanadium.
12, the only sharp manufacture method that requires 10 described new electromagnetic wave absorbing materials of basis is characterized in that, described strong mixing: add disperse means water and ethanol, incorporation time is 2～6 hours.
13, the manufacture method of new electromagnetic wave absorbing material according to claim 10 is characterized in that, described pre-burning: temperature is 700～1180 ℃ in air, and sintering time is 1～4 hour.
14, the manufacture method of new electromagnetic wave absorbing material according to claim 10 is characterized in that, described ball milling: add disperse means water and ethanol, the ball milling time is 2～12 hours.
15, the manufacture method of new electromagnetic wave absorbing material according to claim 10 is characterized in that, described heat treatment: temperature is 1100～1500 ℃ in a vacuum, and sintering time is 1～5 hour.
16, the manufacture method of new electromagnetic wave absorbing material according to claim 10 is characterized in that, described pulverizing: pulverize with Hubei Province formula.
17, the wafer made of a kind of new electromagnetic wave absorbing material is characterized in that, is with the logical rolled-to-death rubber of powder of above-mentioned absorbing material, grinds pressure, sulfuration, moulding and form.
18, wafer according to claim 17 is characterized in that, described refining glue be the absorbing material powder that will crush with rubber ratio by (6～9): mix (4～1), and rolled 1～10 hour, reaches full and uniform mixing.
19, wafer according to claim 17 is characterized in that, temperature is 140 ℃～220 ℃ during described sulfuration, and the time kept 10～50 minutes.
20, wafer according to claim 17 is characterized in that, described moulding is that the material with vulcanizing treatment strikes out the suction quarter wave plate 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97108989 CN1113371C (en) | 1997-07-18 | 1997-07-18 | New electromagnetic wave absorbing material and its preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97108989 CN1113371C (en) | 1997-07-18 | 1997-07-18 | New electromagnetic wave absorbing material and its preparation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1206204A true CN1206204A (en) | 1999-01-27 |
| CN1113371C CN1113371C (en) | 2003-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97108989 Expired - Fee Related CN1113371C (en) | 1997-07-18 | 1997-07-18 | New electromagnetic wave absorbing material and its preparation |
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| CN (1) | CN1113371C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100335587C (en) * | 2005-12-01 | 2007-09-05 | 上海交通大学 | Dielectric/magnetic composite wave-absorbing powder preparation method |
| CN101246773B (en) * | 2007-02-12 | 2010-05-19 | 北京有色金属研究总院 | High-efficiency soft magnetic material and method for producing the same |
| CN102086114A (en) * | 2010-11-19 | 2011-06-08 | 北京工业大学 | Ferrite gypsum-based microwave-absorbing composite material and preparation method thereof |
| CN102516934A (en) * | 2011-11-09 | 2012-06-27 | 天津大学 | Foam glass-based microwave absorbing material added with metal powder |
| CN103881245A (en) * | 2014-04-11 | 2014-06-25 | 重庆市鸿富诚电子新材料有限公司 | Wave-absorbing material and preparation method thereof |
-
1997
- 1997-07-18 CN CN 97108989 patent/CN1113371C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100335587C (en) * | 2005-12-01 | 2007-09-05 | 上海交通大学 | Dielectric/magnetic composite wave-absorbing powder preparation method |
| CN101246773B (en) * | 2007-02-12 | 2010-05-19 | 北京有色金属研究总院 | High-efficiency soft magnetic material and method for producing the same |
| CN102086114A (en) * | 2010-11-19 | 2011-06-08 | 北京工业大学 | Ferrite gypsum-based microwave-absorbing composite material and preparation method thereof |
| CN102086114B (en) * | 2010-11-19 | 2013-05-22 | 北京工业大学 | Ferrite gypsum-based microwave-absorbing composite material and preparation method thereof |
| CN102516934A (en) * | 2011-11-09 | 2012-06-27 | 天津大学 | Foam glass-based microwave absorbing material added with metal powder |
| CN103881245A (en) * | 2014-04-11 | 2014-06-25 | 重庆市鸿富诚电子新材料有限公司 | Wave-absorbing material and preparation method thereof |
| CN103881245B (en) * | 2014-04-11 | 2016-02-10 | 重庆市鸿富诚电子新材料有限公司 | A kind of absorbing material and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN1113371C (en) | 2003-07-02 |
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