Abrasive articles including abrasive particles of silicon nitride
An abrasive article includes a body having abrasive particles contained within a bond material. The abrasive particles can include a majority content of silicon nitride and a minority content of sintering material including at least two rare-earth oxide materials. In an embodiment, the rare-earth oxide materials can include Nd 2 O 3 and Y 2 O 3 . In a particular embodiment, the abrasive particles comprise a content (wt %) of Nd 2 O 3 that is greater than a content of Y 2 O 3 (wt %).
1. An abrasive article comprising:
a body comprising abrasive particles contained within a bond material, each of the abrasive particles comprising (i) a majority content of silicon nitride; and (ii) a minority content of sintering material including Nd 2 O 3 and Y 2 O 3 , wherein each of the abrasive particles comprises a content (wt %) of Nd 2 O 3 greater than a content of Y 2 O 3 (wt %), and wherein the body comprises no greater than about 5 vol % porosity.
2. The abrasive article of claim 1 , wherein the body comprises a single-layered abrasive tool having a single layer of abrasive particles attached to a substrate with a layer of the bond material.
3. The abrasive article of claim 2 , wherein a portion of the abrasive particles protrude from the bond material and are contacting the substrate underlying the bond material.
4. The abrasive article of claim 1 , wherein each of the abrasive particles comprises a total content of rare earth oxide greater than a content of alumina.
5. The abrasive article of claim 1 , wherein each of the abrasive particles comprises a content of alumina (wt %) that is between about 0.3 and about 0.7 of a content (wt %) of a rare earth oxide composition.
6. The abrasive article of claim 1 , wherein each of the abrasive particles comprises no greater than about 10 wt % of a rare earth oxide for the total weight of the abrasive particles.
7. The abrasive article of claim 1 , wherein each of the abrasive particles comprises no greater than about 3 wt % AlN for the total weight of the abrasive particles.
8. The abrasive article of claim 1 , wherein each of the abrasive particles consists essentially of silicon nitride and a sintering phase comprising an oxide.
9. The abrasive article of claim 1 , wherein each of the abrasive particles comprises liquid phase sintered silicon nitride.
10. The abrasive article of claim 1 , wherein each of the abrasive particles comprises a majority content (>50 wt %) of beta-phase silicon nitride.
11. The abrasive article of claim 1 , wherein at least a portion of the abrasive particles are shaped abrasive particles.
12. An abrasive article comprising:
a body comprising abrasive particles contained within a bond material, the abrasive particles comprising a majority content of silicon nitride and a minority content of sintering material including Nd 2 O 3 and Y 2 O 3 , wherein the abrasive particles comprise a content (wt %) of Nd 2 O 3 greater than a content of Y 2 O 3 (wt %), and wherein the abrasive particles comprise a total content of rare earth oxide greater than a content of alumina.
13. The abrasive article of claim 12 , wherein the abrasive particles comprise no greater than about 10 wt % of a rare earth oxide.
14. The abrasive article of claim 12 , wherein the abrasive particles comprise AlN.
15. The abrasive article of claim 12 , wherein at least a portion of the abrasive particles are shaped abrasive particles.
16. The abrasive article of claim 12 , wherein the abrasive particles comprise a content of alumina (wt %) that is between about 0.3 and about 0.7 of a content (wt %) of a rare earth oxide.
17. The abrasive article of claim 15 , wherein each of the shaped abrasive particles comprises a body having a two-dimensional shape as viewed in a plane defined by a length and a width of the body, wherein the two-dimensional shape is selected from the group consisting of a polygonal shape, an ellipsoidal shape, a numeral, a Greek alphabet character, Latin alphabet character, Russian alphabet character, and a complex shape utilizing a combination of polygonal shapes.
18. An abrasive article comprising:
a body comprising abrasive particles contained within a bond material, the abrasive particles comprising a majority content (>50 wt %) of beta-phase silicon nitride and a minority content of sintering material including Nd 2 O 3 and Y 2 O 3 , wherein the abrasive particles comprise a content (wt %) of Nd 2 O 3 greater than a content of Y 2 O 3 (wt %).
19. The abrasive article of claim 16 , wherein the abrasive particles comprise no greater than about 10 wt % of a rare earth oxide.
20. The abrasive article of claim 18 , wherein at least a portion of the abrasive particles are shaped abrasive particles.