# US 11,028,019 B2 · Boron carbide composite

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- Number: US 11,028,019 B2
- Document ID: US11028019B2
- Status: Granted
- Kind: B2
- Application number: 16/655,325
- Filed: 2019-10-17
- Published: 2020-06-04
- Granted: 2021-06-08
- Earliest claimed: 2018-11-29
- Assignees: Purdue Research Foundation
- Applicants: Purdue Research Foundation
- Inventors: Jeffrey P Youngblood; Erich Weaver; Rodney W. Trice; Andres Diaz-Cano; Andrew Schlup
- Web page: https://patentgrep.com/patent/US11028019B2

## CPC

- C04B 35/563: based on boron carbide
- B28B 1/24: by injection moulding {(injection moulding of ceramic slips B28B1/265; of tubular articles B28B21/38)}
- B28B 11/243: {Setting, e.g. drying, dehydrating or firing ceramic articles (B28B11/242 takes precedence)}
- C04B 35/6261: {Milling}
- C04B 35/6263: {characterised by their solids loadings, i.e. the percentage of solids}
- C04B 35/6264: {Mixing media, e.g. organic solvents}
- C04B 35/63444: {Nitrogen-containing polymers, e.g. polyacrylamides, polyacrylonitriles, polyvinylpyrrolidone [PVP], polyethylenimine [PEI]}
- C04B 35/64: Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F})
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/3225: Yttrium oxide or oxide-forming salts thereof
- C04B 2235/3821: Boron carbides
- C04B 2235/3847: Tungsten carbides
- C04B 2235/405: Iron group metals
- C04B 2235/5436: micrometer sized, i.e. from 1 to 100 micron
- C04B 2235/6022: Injection moulding
- C04B 2235/656: characterised by specific heating conditions during heat treatment
- C04B 2235/6562: Heating rate
- C04B 2235/668: Pressureless sintering
- C04B 2235/72: Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
- C04B 2235/77: Density
- C04B 2235/80: Phases present in the sintered or melt-cast ceramic products other than the main phase
- 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)

## Abstract

The present disclosure relates to boron carbide (B4C) composite material and the method of making and using the boron carbide (B4C) composite.

## Claims

### Claim 1

A composite material comprising a sintered product of a mixture comprising 70-95 wt. % of boron carbide (B4C), 2-15 wt. % of tungsten carbide-cobalt (WC—Co), and 3-15 wt. % of yttrium oxide (Y2O3), wherein said boron carbide, tungsten carbide-cobalt (WC—Co), and yttrium oxide are substantially uniformly distributed in the sintered product, wherein the sintered product has a relative density of 90-99%.

### Claim 2 (depends on 1)

The composite material of claim 1, wherein the mixture comprises 70-90 wt. % of boron carbide (B4C), 5-15 wt. % of tungsten carbide-cobalt (WC—Co), and 5-15 wt. % of yttrium oxide (Y2O3).

### Claim 3 (depends on 1)

The composite material of claim 1, wherein the sintered product has a relative density of 97-99%.

### Claim 4 (depends on 1)

The composite material of claim 1, wherein the sintered product is obtained under substantially pressureless condition at a temperature range of 1600-2600° C.

### Claim 5 (depends on 1)

The composite material of claim 1, wherein said boron carbide is first attrition milled with tungsten carbide in ethanol to provide attrition milled mixture of boron carbide and tungsten carbide-cobalt (WC—Co), wherein said boron carbide after attrition milled is substantially free of boron oxide (B2O3).

### Claim 6 (depends on 1)

A method of preparing the composite material of claim 1, comprising:
attrition milling boron carbide and tungsten carbide in ethanol to provide an attrition milled powder comprising boron carbide and tungsten carbide-cobalt (WC—Co), wherein said boron carbide after the attrition milling is substantially free of boron oxide (B2O3);
preparing an aqueous suspension comprising the attrition milled boron carbide and tungsten carbide-cobalt (WC—Co) powder, and yttrium oxide powder;
injecting mold said suspension and making it a dried mixture; and
sintering the dried mixture at a temperature range of 1600-2600° C. to provide the composite material.

### Claim 7 (depends on 6)

The method of claim 6, wherein the sintering is carried out at substantially pressureless condition.