Composite material and method for preparing the same

Patent metadata

Field	Value
Publication number	US-9873773-B2
Application number	US-201615134708-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	Apr 23, 2015
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

Disclosed are a composite material and a method for preparing the same. The composite material is consisted of TiO 2 and BaZn 1.2 Co 0.8 Fe 16 O 27 . The composite material of the invention has the advantages of high absorption frequency band, good compatibility and wide frequency band, and it is applicable for the shell protection material of a mobile phone or a TV set, thereby absorbing the electromagnetic wave band that is the most harmful to human bodies, without influencing the normal communication function of an electronic device, for example, a mobile phone.

First claim

What is claimed is:

1. A composite material, comprising TiO 2 -coated BaZn 1.2 Co 0.8 Fe 16 O 27 particulates.

2. The composite material according to claim 1 , wherein, a weight ratio of TiO 2 to BaZn 1.2 Co 0.8 Fe 16 O 27 is (0.1-10):(1-10).

3. The composite material according to claim 1 , wherein, the composite material is a powder with a micrometer-level grain size.

4. The composite material according to claim 1 , wherein, a reflection loss of the composite material at 7.76-13.68 GHz is less than −10 dB, and a reflection loss thereof at 10.3 GHz is −47.6 dB.

5. An electronic device shell, which is made from a raw material comprising the composite material according to claim 1 .

6. The electronic device shell according to claim 5 , wherein, the weight ratio of TiO 2 to BaZn 1.2 Co 0.8 Fe 16 O 27 is (0.1-10):(1-10).

7. The electronic device shell according to claim 5 , wherein, the composite material is a powder with a micrometer-level grain size.

8. The electronic device shell according to claim 5 , wherein, the reflection loss of the composite material at 7.76-13.68 GHz is less than −10 dB, and the reflection loss thereof at 10.3 GHz is -47.6 dB.

9. The electronic device shell according to claim 5 , wherein, the electronic device is a mobile phone.

10. A method for preparing a composite material, comprising the steps of:
dissolving Ba(NO 3 ) 2 , Zn(NO 3 ) 2 .6H 2 O, Co(NO 3 ) 2 .6H 2 O and Fe(NO 3 ) 3 .9H 2 O in distilled water at a molar ratio of 1:1.2:0.8:16, adding a citric acid at a molar ratio of 10:1 relative to Ba(NO 3 ) 2 , stirring till complete dissolution, adjusting a pH value of a resultant solution to neutrality, evaporating the solution to prepare a sol, drying to obtain a gel, and then calcining the gel to obtain BaZn 1.2 Co 0.8 Fe 16 O 27 ; and
adding BaZn 1.2 Co 0.8 Fe 16 O 27 into a TiO 2 sol, stirring and filtering, washing the obtained filter residue, drying the obtained filter residue to obtain a precursor, and drying the precursor to obtain the composite material which comprises TiO 2 -coated BaZn 1.2 Co 0.8 Fe 16 O 27 particulates.

11. The method according to claim 10 , wherein, Ba(NO 3 ) 2 is analytically pure Ba(NO 3 ) 2 , Zn(NO 3 ) 2 .6H 2 O is analytically pure Zn(NO 3 ) 2 .6H 2 O, Co(NO 3 ) 2 .6H 2 O is analytically pure Co(NO 3 ) 2 .6H 2 O, Fe(NO 3 ) 3 .9H 2 O is analytically pure Fe(NO 3 ) 3 .9H 2 O.

12. The method according to claim 10 , wherein, the evaporation is constant-temperature evaporation in 70° C. water bath.

13. The method according to claim 10 , wherein, before being calcined at 1300° C., the gel is ground into powder.

14. The method according to claim 10 , wherein, the filter residue is washed with absolute ethyl alcohol.

15. The method according to claim 14 , wherein, the filter residue washed with absolute ethyl alcohol is dried at 80° C.

16. The method according to claim 10 , wherein, the TiO 2 sol is prepared by: dissolving 2 parts by weight of butyl titanate and 1 part by weight of glacial acetic acid in 10 parts by weight of absolute ethyl alcohol, and stirring to obtain a transparent solution; and adding 4 parts by weight of an ethanol solution with a volume fraction of 75% dropwise into the transparent solution slowly, and stirring to obtain the TiO 2 sol.

17. The method according to claim 10 , wherein, the calcining is performed at 1300° C.

18. The method according to claim 10 , wherein, a weight ratio of TiO 2 to BaZn 1.2 Co 0.8 Fe 16 O 27 is (0.1-10):(1-10).

Assignees

• Boe Technology Group Co Ltd

Inventors

• Zhang Wei
• Kong Xiangchun

Classifications

• H01F1/00

  Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C08K3/00 Primary

  Use of inorganic substances as compounding ingredients · CPC title

• C04B35/00

  Shaped ceramic products characterised by their composition {(porous ceramic products C04B38/00; ceramic articles characterised by particular shape, see the relevant classes, e.g. linings for casting ladles, tundishes, cups or the like B22D41/02; ceramic substrates for microelectronic semi-conductors H10W70/692)}; Ceramics compositions ({shaping of ceramics B28B;} containing free metal bonded to carbides, diamond, oxides, borides, nitrides, silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides or sulfides other than as macroscopic reinforcing agents C22C); Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products {(infiltration of sintered ceramic preforms with molten metal C04B41/51; chemical preparation of powders of inorganic compounds C01)} · CPC title

• C08K3/22 Primary

  of metals · CPC title