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1. WO2020115640 - ABRASIVE ARTICLE COMPRISING AGGLOMERATES AND METHOD OF MAKING THEREOF

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[ EN ]

CLAIMS

1. An abrasive article comprising:

a carrier body as well as

an abrasive layer, wherein the abrasive layer comprises

agglomerates with superabrasive particles bound in a first vitrified bond (bond I) as well as a second vitrified bond (bond II) bonding the agglomerates, wherein temperature of the hemisphere point measured according to DIN 51730 (2007-09-00) of the first vitrified bond (bond I) is higher or the same than the temperature of the hemisphere point measured according to DIN 51730 (2007-09-00) of the second vitrified bond (bond II).

2. The abrasive article according to claim 1, wherein the superabrasive particles comprise cubic boron nitride (CBN) and/or diamonds.

3. The abrasive article according to claim 1 or 2, wherein the superabrasive particles are present in a range from 20 to 50 vol. % based on the volume of the abrasive layer, preferably in a range from 30 to 40 vol. % based on the volume of the abrasive layer.

4. The abrasive article according to any of the preceding claims, wherein the first vitrified bond I is present in a range from 5 to 20 vol. % based on the volume of the abrasive layer, preferably in a range from 6 to 12 vol.% based on the volume of the abrasive layer.

5. The abrasive article according to any of the preceding claims, wherein the second vitrified bond II is present in a range from 5 to 20 vol. % based on the volume of the abrasive layer, preferably in a range from 7 to 15 vol. % based on the volume of the abrasive layer.

6. The abrasive article according to any of the preceding claims, wherein the abrasive layer comprises pores in a range from 35 to 55 vol. % based on the volume of the abrasive layer.

7. The abrasive article according to any of the preceding claims, wherein the agglomerates have an average equivalent circle diameter of 0.4 to 1.3 mm.

8. The abrasive article according to any of the preceding claims, wherein the superabrasive particles in the agglomerate have an average size between US 400/500 mesh to US 60/80 mesh measured according to ANSI B74.12-2012.

9. The abrasive article according to any of the preceding claims, wherein the agglomerates are irregularly shaped or have a precise shape.

10. The abrasive article according to any of the preceding claims, wherein the agglomerates have a precise shape, for example a cube, pyramid, truncated pyramid or a sphere.

11. A method of making an abrasive layer for an article according to any of the claims 1 to 10, the method comprising the steps of:

providing agglomerates with superabrasive particles bound in a first vitrified bond (bond I) providing a frit for generating a second vitrified bond (bond II)

optionally providing other components like additives

mixing the agglomerates, the frit as well as the optional components to a homogeneous mixture;

bringing this mixture in the form of an abrasive layer or in the form of segments or pellets for building an abrasive layer;

sintering the formed mixture at a temperature that is lower than the temperature used for sintering the agglomerates.

12. The method according to claim 11, wherein the difference between the sintering temperature of the first vitrified bond (bond I) and the sintering temperature of the above method is between 20 and 300 °C.

13. The method according to claim 11 or 12, wherein the optional other components may be additives like temporary binders as poly carboxylic acid, polyethylenglykol, dextrin.