# US 2013/0280995 A1 · Abrasive material and abrasive wheel

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- Number: US 2013/0280995 A1
- Document ID: US20130280995A1
- Status: Published application
- Kind: A1
- Application number: 13/864,626
- Filed: 2013-04-17
- Published: 2013-10-24
- Earliest claimed: 2012-04-20
- Assignees: Hermes-Schleifmittel GmbH & Company
- Inventors: Stephan Dopp; Dirk-Olaf Damrau
- Web page: https://patentgrep.com/patent/US20130280995A1

## CPC

- B24D 3/00: Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D 3/34: characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D 5/063: {with segments embedded in a matrix which is rubbed away during the grinding process}
- B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11)

## Abstract

The invention relates to an abrasive having a base body and abrasive particles applied to the surface of the base body, characterized in that the base body has a multicellular structure. The invention further relates to a process for producing this abrasive and to a grinding tool based on this abrasive.

## Claims

### Claim 1

Abrasive having a base body and abrasive particles applied to the surface of the base body, characterized in that the base body has a multicellular structure.

### Claim 2 (depends on 1)

Abrasive according to claim 1, characterized in that the base body is a foamed glass body.

### Claim 3 (depends on 1)

Abrasive according to claim 1, characterized in that the base body is essentially spherical.

### Claim 4 (depends on 1)

Abrasive according to claim 1, characterized in that the average size of the abrasive bodies is 0.1-2 mm, preferably 0.2-1 mm, more preferably 0.3-0.5 mm.

### Claim 5 (depends on 1)

Abrasive according to claim 1, characterized in that the pore size of the base body is in the range from 1 to 200 μm.

### Claim 6 (depends on 1)

Abrasive according to claim 1, characterized in that the density of the base body is in the range from 0.3 to 1 g/cm3.

### Claim 7 (depends on 1)

Abrasive according to claim 1, characterized in that the compressive strength of a base body is 0.2-6 N.

### Claim 8 (depends on 1)

Abrasive according to claim 1, characterized in that the compressive strength of a bed of the base bodies is 1-4 N/mm2, preferably 1.5-3 N/mm2.

### Claim 9 (depends on 1)

Abrasive according to claim 1, characterized in that the abrasive particles consist of a particle size fraction in the range from P150 to P1000, preferably from P180 to P500.

### Claim 10 (depends on 1)

Abrasive according to claim 1, characterized in that the abrasive particles comprise α-alumina or silicon carbide.

### Claim 11 (depends on 1)

Process for producing an abrasive according to claim 1, characterized by the following steps:
d) provision of the multicellular base bodies,
e) coating of the base body with binder,
f) coating of the base body with abrasive particles.

### Claim 12 (depends on 11)

Process according to claim 11, characterized in that the abrasive is heat-treated, preferably at temperatures of 400-1000° C., preferably 800-1000° C.

### Claim 13 (depends on 1)

Grinding tool having a substrate, a binder for abrasive and an abrasive, wherein the substrate preferably comprises a woven fabric, a knitted fabric or paper, film or nonwoven, characterized in that it comprises abrasive according to claim 1.

### Claim 14 (depends on 1)

Bonded grinding tool, characterized in that it comprises binder and abrasive according to claim 1.

### Claim 15 (depends on 13)

Grinding tool according to claim 13, characterized in that it additionally has a covering binder.