# US 10,308,555 B2 · Wave-absorbing materials and methods for preparing the same

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- Number: US 10,308,555 B2
- Document ID: US10308555B2
- Status: Granted
- Kind: B2
- Application number: 15/064,504
- Filed: 2016-03-08
- Published: 2016-06-30
- Granted: 2019-06-04
- Earliest claimed: 2013-09-25
- Assignees: BYD Company Limited
- Applicants: BYD Company Limited
- Inventors: Houyin Liu; Xianjun Kong; Dajun Chen
- Web page: https://patentgrep.com/patent/US10308555B2

## CPC

- C04B 35/2625: {containing magnesium}
- B28B 17/0009: {Shaping of preshaped articles (shaping the surface of articles B28B11/08)}
- C04B 35/016: {based on manganites}
- C04B 35/053: Fine ceramics
- C04B 35/26: based on ferrites
- C04B 35/453: based on zinc, tin, or bismuth oxides or solid solutions thereof with other oxides, e.g. zincates, stannates or bismuthates
- C04B 35/6261: {Milling}
- C04B 35/64: Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F})
- H01F 1/344: {Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4}
- H01F 1/36: in the form of particles {(H01F1/346, H01F1/348 and H01F1/38 take precedence)}
- H01F 41/0246: {Manufacturing of magnetic circuits by moulding or by pressing powder (magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36)}
- H05K 9/0075: {Magnetic shielding materials}
- H05K 9/0083: {comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers (H05K9/0086 takes precedence)}
- C04B 2235/3206: Magnesium oxides or oxide-forming salts thereof
- C04B 2235/3229: Cerium oxides or oxide-forming salts thereof
- C04B 2235/3239: Vanadium oxides, vanadates or oxide forming salts thereof, e.g. magnesium vanadate
- C04B 2235/3251: Niobium oxides, niobates, tantalum oxides, tantalates, or oxide-forming salts thereof
- C04B 2235/3256: Molybdenum oxides, molybdates or oxide forming salts thereof, e.g. cadmium molybdate
- C04B 2235/3262: Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
- C04B 2235/3284: Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
- C04B 2235/3298: Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate
- C04B 2235/34: Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B 2235/3418: Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
- C04B 2235/602: Making the green bodies or pre-forms by moulding
- C04B 2235/6022: Injection moulding
- C04B 2235/6025: Tape casting, e.g. with a doctor blade
- C04B 2235/6562: Heating rate
- C04B 2235/6567: Treatment time
- C04B 2235/661: Multi-step sintering
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- B28B: SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER (foundry moulding B22C; working stone or stone-like material B28D; shaping of substances in a plastic state, in general B29C; making layered products not composed wholly of these substances B32B)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## 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.

## Claims

### Claim 1

A wave-absorbing material comprising:
a main composition comprising Fe2O3, MnO, ZnO, and MgO;
an auxiliary composition comprising CeO2 and P2O5, wherein a molar ratio of CeO2 to P2O5 ranges from 1:1 to 2:1; and
a sintering additive.

### Claim 2 (depends on 1)

The wave-absorbing material of claim 1, wherein of a total molar amount of the wave-absorbing material, an amount of Fe2O3 ranges from 40 mol % to 54 mol %.

### Claim 3 (depends on 1)

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 %.

### Claim 4 (depends on 1)

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 %.

### Claim 5 (depends on 1)

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 %.

### Claim 6 (depends on 1)

The wave-absorbing material of claim 1, wherein of a total molar amount of the wave-absorbing material, an amount of CeO2 ranges from 0.1 mol % to 3.5 mol %.

### Claim 7 (depends on 1)

The wave-absorbing material of claim 1, wherein of a total molar amount of the wave-absorbing material, an amount of P2O5 ranges from 0.1 mol % to 2.5 mol %.

### Claim 8 (depends on 1)

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 %.

### Claim 9 (depends on 1)

The wave-absorbing material of claim 1, wherein the sintering additive is at least one selected from Nb2O5, MoO3, Bi2O3, V2O5, and SiO2.

### Claim 10 (depends on 9)

The wave-absorbing material of claim 9, wherein of a total molar amount of the wave-absorbing material, an amount of Nb2O5 ranges from 0.1 mol % to 2.5 mol %, an amount of MoO3 ranges from 0.1 mol % to 1.5 mol %, an amount of Bi2O3 ranges from 0.2 mol % to 1.5 mol %, an amount of V2O5 ranges from 0.1 mol % to 1.5 mol %, and an amount of SiO2 ranges from 0.2 mol % to 2.5 mol %.

### Claim 11

A method for preparing a wave-absorbing material, comprising:
providing a mixture comprising a main composition comprising Fe2O3, 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 CeO2 and P2O5 to form a second powder, wherein a molar ratio of CeO2 to P2O5 ranges from 1:1 to 2:1; and
molding and second sintering the second powder.

### Claim 12 (depends on 11)

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.

### Claim 13 (depends on 11)

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.

### Claim 14 (depends on 11)

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.

### Claim 15 (depends on 11)

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

### Claim 16 (depends on 11)

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.

### Claim 17 (depends on 11)

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

### Claim 18 (depends on 11)

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

### Claim 19 (depends on 18)

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.