# US 11,999,831 B2 · Aluminum borate whisker reinforced and toughened non-metallic matrix composite and preparation method thereof

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- Number: US 11,999,831 B2
- Document ID: US11999831B2
- Status: Granted
- Kind: B2
- Application number: 17/847,386
- Filed: 2022-06-23
- Published: 2023-04-13
- Granted: 2024-06-04
- Earliest claimed: 2021-06-23
- Assignees: Chongqing University of Science and Technology; Chongqing Stio Measurement & Control Tech Co., Ltd
- Applicants: Chongqing University of Science and Technology; Chongqing Stio Measurement & Control Tech Co., Ltd.
- Inventors: Bi Jia; Jinliang Shi; Zhigang Zou; Yong Zhou; Yongjiang Di; Yin Liu; Yue Shi; Huichao He; Rong Wang; Xueyi Wang; Hao Tian; Jun Zhu; Rui Tang; Xingyu Chen; Danxia Zhang
- Web page: https://patentgrep.com/patent/US11999831B2

## CPC

- C04B 35/80: Fibres, filaments, whiskers, platelets, or the like
- C04B 35/117: Composites
- C04B 35/6261: {Milling}
- C04B 35/645: Pressure sintering
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/3244: Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
- C04B 2235/3409: Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax
- C04B 2235/3813: Refractory metal borides
- C04B 2235/522: Oxidic
- C04B 2235/526: characterised by the length of the fibers
- C04B 2235/5264: characterised by the diameter of the fibers
- C04B 2235/5276: Whiskers, spindles, needles or pins
- C04B 2235/5436: micrometer sized, i.e. from 1 to 100 micron
- C04B 2235/6567: Treatment time
- C04B 2235/6581: Total pressure below 1 atmosphere, e.g. vacuum
- C04B 2235/77: Density
- C04B 2235/786: Micrometer sized grains, i.e. from 1 to 100 micron
- C04B 2235/96: Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C08J 3/203: {Solid polymers with solid and/or liquid additives}
- C08J 5/0405: {with inorganic fibres}
- C08J 2363/00: Characterised by the use of epoxy resins; Derivatives of epoxy resins
- 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
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

An aluminum borate whisker reinforced and toughened non-metallic matrix composite is provided, which specifically includes a non-metallic material reinforced and toughened with aluminum borate whiskers. The composite exhibits a higher bending strength and fracture toughness and a higher wear resistance. A method for preparing the composite is also provided. The method includes mixing the aluminum borate whiskers and the non-metallic material to form a mixture; and sintering the mixture by a vacuum hot press method, or molding the mixture.

## Claims

### Claim 1

A method for preparing an aluminum borate whisker reinforced and toughened non-metallic matrix composite, which includes a non-metallic material reinforced and toughened with aluminum borate whiskers, the method comprising:
a) mixing the aluminum borate whiskers and the non-metallic material by ball milling to form a mixture, wherein in the step a), the aluminum borate whiskers and the non-metallic inorganic material are placed into a ball mill pot and ball milled by zirconia balls; and
b) sintering the mixture by a vacuum hot press method when the non-metallic material is a non-metallic inorganic material, wherein during the sintering at step b), the aluminum borate whiskers are reduced by solid carbon and partially gasified carbon from separator carbon paper, graphite mold, graphite heater, and/or carbon felt,
wherein the sintering is conducted at a temperature of 1480° C. to 1500° C.; and
the aluminum borate whiskers account for 10 to 20% by volume of the aluminum borate whisker reinforced and toughened non-metallic matrix composite.

### Claim 2 (depends on 1)

The method of claim 1, wherein the method further comprises:
at step b), sintering the mixture by the vacuum hot press method at a pressure of 5 to 60 MPa for a period of time of 30 to 300 minutes.

### Claim 3 (depends on 1)

The method of claim 1, wherein, the aluminum borate whiskers and the non-metallic inorganic material are milled to a particle size of less than 1.0 μm.

### Claim 4 (depends on 1)

The method of claim 1, wherein the aluminum borate whiskers account for 20% by volume of the aluminum borate whisker reinforced and toughened non-metallic matrix composite, thereby maximizing a relative density of the composite to be over 99%.