# US 4,381,925 A · Grinding disk

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- Number: US 4,381,925 A
- Document ID: US4381925A
- Status: Granted
- Kind: A
- Application number: 06/229,673
- Filed: 1981-01-29
- Granted: 1983-05-03
- Earliest claimed: 1980-04-01
- Assignees: Tyrolit Schleifmittelwerke Swarovski K.G.
- Inventors: Karl Colleselli
- Web page: https://patentgrep.com/patent/US4381925A

## CPC

- B24D 3/34: characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D 3/346: {utilised during polishing, or grinding operation}
- 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

A grinding disk comprising abrasive grains such as corundum, a bonding agent such as phenolic resin, and a filler material. At least part of said filler material is an active filler, i.e. a material that acts chemically and/or physically in the grinding process. At least part of this active filler material is provided in the form of particles that are solid bodies of lamellar structure. The lamellar structure is a supporting grid and has an intercalated guest component.

## Claims

### Claim 1

In an abrasive article comprising abrasive grains, a bonding agent, and an active filler, the improvement wherein at least a part of the active filler is graphite of a lamellar structure, acting as a supporting grid, having an intercalated guest component selected from the group consisting of a metal, a metal halide, a metal sulfide, a transition metal hydride, a transition metal carbide, a transition metal nitride and elemental sulfur.

### Claim 2 (depends on 1)

An abrasive article according to claim 1, wherein at least 3% of the active filler based on the total weight of the active filler is graphite of a lamellar structure, acting as a supporting grid, having said intercalated guest component.

### Claim 3 (depends on 2)

An abrasive article according to claim 2, wherein 20% to 50% of the active filler based on the total weight of the active filler is graphite of a lamellar structure, acting as a supporting grid, having said intercalated guest component.

### Claim 4 (depends on 1)

An abrasive article according to claim 1, wherein said guest component is a metal, a metal halide or a metal sulfide.

### Claim 5 (depends on 3)

An abrasive article according to claim 3 wherein said filler particles are a graphite-ferrous, chloride intercalation compound.

### Claim 6 (depends on 4)

An abrasive article according to claim 4, wherein said filler particles are a graphite-ferric chloride intercalation compound.

### Claim 7 (depends on 1, 2, 3, 4, 5, 6)

An abrasive article according to claim 1, 2, 3, 4, 5 or 6, wherein said filler particles are provided with a coating.

### Claim 8 (depends on 7)

An abrasive article according to claim 7, wherein said coating is a cured synthetic resin compatible with said bonding agent.

### Claim 9 (depends on 7)

An abrasive article according to claim 7, wherein said coating is inorganic.

### Claim 10 (depends on 8)

An abrasive article according to claim 8, wherein fine grained, hard matters are admixed with said coating to increase adhesiveness.

### Claim 11 (depends on 1)

An abrasive article according to claim 1, wherein the guest component is a member selected from the group consisting of the hydrides, carbides and nitrides of titanium, vanadium, molybdenum and tungsten, an alkali metal, ferric chloride, ferrous chloride, zinc chloride, tin chloride, potassium chloride and elemental sulfur.

### Claim 12 (depends on 9)

An abrasive article according to claim 9, wherein said coating is a silicate or a phosphate.

### Claim 13 (depends on 10)

An abrasive article according to claim 10, wherein said fine grained, hard matters are silicon carbide, corundum or a silicate.

### Claim 14 (depends on 9)

An abrasive article according to claim 9, wherein fine grained, hard matters are admixed with said coating to increase adhesiveness.

### Claim 15 (depends on 14)

An abrasive article according to claim 14, wherein said fine grained, hard matters are silicon carbide, corundum or a silicate.