Wave-absorbing materials and methods for preparing the same

Patent metadata

Field	Value
Publication number	US-10308555-B2
Application number	US-201615064504-A
Country	US
Kind code	B2
Filing date	Mar 8, 2016
Priority date	Sep 25, 2013
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

Embodiments of the present disclosure are drawn to a wave-absorbing material that includes a main composition, an auxiliary composition, and a sintering additive. The main composition includes at least one of Fe2O3, MnO, ZnO, and MgO. The auxiliary composition includes at least one of CeO2 and P2O5. The molar ratio of CeO2 to P2O5 ranges from about 1:1 to about 2:1. A method for preparing the wave-absorbing material is also provided.

First claim

What is claimed is:

1. A wave-absorbing material comprising:
a main composition comprising Fe 2 O 3 , MnO, ZnO, and MgO;
an auxiliary composition comprising CeO 2 and P 2 O 5 , wherein a molar ratio of CeO 2 to P 2 O 5 ranges from 1:1 to 2:1; and
a sintering additive.

2. The wave-absorbing material of claim 1 , wherein of a total molar amount of the wave-absorbing material, an amount of Fe 2 O 3 ranges from 40 mol % to 54 mol %.

3. The wave-absorbing material of claim 1 , wherein of a total molar amount of the wave-absorbing material, an amount of MnO ranges from 12 mol % to 20 mol %.

4. The wave-absorbing material of claim 1 , wherein of a total molar amount of the wave-absorbing material, an amount of ZnO ranges from 22 mol % to 25 mol %.

5. The wave-absorbing material of claim 1 , wherein of a total molar amount of the wave-absorbing material, an amount of MgO ranges from 5 mol % to 10 mol %.

6. The wave-absorbing material of claim 1 , wherein of a total molar amount of the wave-absorbing material, an amount of CeO 2 ranges from 0.1 mol % to 3.5 mol %.

7. The wave-absorbing material of claim 1 , wherein of a total molar amount of the wave-absorbing material, an amount of P 2 O 5 ranges from 0.1 mol % to 2.5 mol %.

8. The wave-absorbing material of claim 1 , wherein of a total molar amount of the wave-absorbing material, an amount of the sintering additive ranges from 0.2 mol % to 3.5 mol %.

9. The wave-absorbing material of claim 1 , wherein the sintering additive is at least one selected from Nb 2 O 5 , MoO 3 , Bi 2 O 3 , V 2 O 5 , and SiO 2 .

10. The wave-absorbing material of claim 9 , wherein of a total molar amount of the wave-absorbing material, an amount of Nb 2 O 5 ranges from 0.1 mol % to 2.5 mol %, an amount of MoO 3 ranges from 0.1 mol % to 1.5 mol %, an amount of Bi 2 O 3 ranges from 0.2 mol % to 1.5 mol %, an amount of V 2 O 5 ranges from 0.1 mol % to 1.5 mol %, and an amount of SiO 2 ranges from 0.2 mol % to 2.5 mol %.

11. A method for preparing a wave-absorbing material, comprising:
providing a mixture comprising a main composition comprising Fe 2 O 3 , MnO, ZnO, and MgO, and a sintering additive;
first grinding and first sintering the mixture together with a solvent and a dispersant to form a first powder;
second grinding the first powder together with CeO 2 and P 2 O 5 to form a second powder, wherein a molar ratio of CeO 2 to P 2 O 5 ranges from 1:1 to 2:1; and
molding and second sintering the second powder.

12. The method of claim 11 , wherein the first grinding is a wet grinding performed at a grinding speed ranging from 400 r/min to 450 r/min for a period of time ranging from 8 hours to 12 hours.

13. The method of claim 11 , wherein the first sintering comprises:
first heating a grinded product obtained from the first grinding to a temperature ranging from 700° C. to 950° C. with a temperature increasing rate of about 3° C./min to 5° C./min;
maintaining the heated product obtained from the first heating at the temperature ranging from 700° C. to 950° C. for a period of time ranging from 1 hour to 4 hours.

14. The method of claim 11 , wherein the second grinding is a ball-milling performed at a grinding speed ranging from 300 r/min to 450 r/min for a period of time ranging from 4 hours to 10 hours.

15. The method of claim 11 , wherein the molding is performed by at least one of blade casting, coating, press molding, or injection molding.

16. The method of claim 11 , wherein the second sintering comprises:
second heating a sintered product obtained from the first sintering to a temperature ranging from 1000° C. to 1150° C. with a temperature increasing rate ranging from 0.5° C./min to 3° C./min; and
maintaining the heated product obtained from the second heating at the temperature ranging from 1000° C. to 1150° C. for a period of time ranging from 2 hours to 4 hours.

17. The method of claim 11 , further comprising screening the second powder before the molding.

18. The method of claim 11 , further comprising drying a grinded product obtained from the first grinding before the first sintering.

19. The method of claim 18 , wherein the drying is performed at a temperature ranging from 60° C. to 80° C. for a period of time ranging from 10 hours to 20 hours.

Assignees

• Byd Co Ltd

Inventors

• Liu Houyin
• Kong Xianjun
• Chen Dajun

Classifications

• C04B2235/3298

  Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate · CPC title

• H01F1/344

  Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4 · CPC title

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B2235/661

  Multi-step sintering · CPC title

• C04B35/6261

  Milling · CPC title