Abrasive articles and methods for forming same

Patent metadata

Field	Value
Publication number	US-9790411-B2
Application number	US-201514984274-A
Country	US
Kind code	B2
Filing date	Dec 30, 2015
Priority date	Dec 30, 2014
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

An abrasive article can include a body including a bond material and abrasive particles contained within the bond material. The abrasive particles can include nanocrystalline alumina. The bond material can include an organic material. In an embodiment, the nanocrystalline alumina may have an average crystallite size of not greater than 1.5 microns. In another embodiment, the bond material and the abrasive particles may be mixed and the mixture may cure to form the abrasive article of embodiments herein.

First claim

What is claimed is:

1. An abrasive article comprising:
a body including:
a bond material in a content of 5 vol % to 55 vol % for a total volume of the body, wherein the bond material comprises an organic material;
abrasive particles contained within the bond material, wherein the abrasive particles are in a content of 6 vol % to 65 vol % for the total volume of the body, wherein the abrasive particles comprises nanocrystalline alumina having an average crystallite size of at least 0.01 microns and not greater than 0.16 microns; and
a porosity of 8 vol % to 70 vol % for the total volume of the body.

2. The abrasive article of claim 1 , wherein the average crystallite size is in a range of at least 0.05 microns to not greater than about 0.14 microns.

3. The abrasive article of claim 1 , wherein the abrasive particles comprise shaped abrasive particles, each shaped abrasive particle having a body including a two-dimensional shape selected from the group consisting of regular polygons, irregular polygons, irregular shapes, triangles, partially-concave triangles, quadrilaterals, rectangles, trapezoids, pentagons, hexagons, heptagons, octagons, ellipses, Greek alphabet characters, Latin alphabet characters, Russian alphabet characters, and a combination thereof.

4. The abrasive article of claim 1 , wherein the abrasive particles comprising nanocrystalline alumina include an additive comprising a material selected from the group consisting of magnesium, zirconium, calcium, silicon, iron, yttrium, lanthanum, cerium, and a combination thereof.

5. The abrasive article of claim 4 , wherein the abrasive particles comprising nanocrystalline alumina comprise a total content of the additive of at least about 0.1 wt % to not greater than about 12 wt % for a total weight of the nanocrystalline alumina.

6. The abrasive article of claim 4 , wherein the additive includes magnesium oxide (MgO) and wherein the abrasive particles comprising nanocrystalline alumina comprise MgO in a content from at least about 0.1 wt % to not greater than about 5 wt % for a total weight of the nanocrystalline alumina.

7. The abrasive article of claim 4 , wherein the additive includes zirconium oxide (ZrO 2 ), and wherein the abrasive particles comprising nanocrystalline alumina comprise ZrO 2 in a content from at least about 0.1 wt % to not greater than about 8 wt % for a total weight of the nanocrystalline alumina.

8. The abrasive article of claim 4 , wherein the additive includes magnesium oxide (MgO) and zirconium oxide (ZrO 2 ), wherein the abrasive particles comprising nanocrystalline alumina comprise an additive ratio (MgO/ZrO 2 ) in a range from at least about 0.01 to not greater than 1.5.

9. The abrasive article of claim 4 , wherein the additive includes calcium oxide (CaO), and wherein the abrasive particles comprising nanocrystalline alumina comprise a CaO in a content from at least about 0.01 wt % to not greater than about 5 wt % for a total weight of the nanocrystalline alumina.

10. The abrasive article of claim 4 , wherein the additive includes magnesium oxide (MgO) and calcium oxide (CaO), and wherein the abrasive particles comprising nanocrystalline alumina comprise an additive ratio (CaO/MgO) of at least about 0.01 to not greater than 1.

11. The abrasive article of claim 1 , wherein the body comprises for total volume of the body:
45 vol % to 56 vol % of the abrasive particles;
5 vol % to 40 vol % of the bond material; and
16 vol % to 45 vol % of a porosity.

12. The abrasive article of claim 1 , wherein the body comprises a content of the abrasive particles comprising nanocrystalline alumina, wherein the content is at least 4 vol % and not greater than 65 vol %.

13. The abrasive article of claim 1 , wherein the abrasive particles comprises a first type of abrasive particles including nanocrystalline alumina and second type of abrasive particles including an oxide, a carbide, a nitride, a boride, an oxycarbide, an oxynitride, or a combination thereof.

14. The abrasive article of claim 1 , wherein the abrasive particles further comprises abrasive particles including a fused alumina, abrasive particles including SiC, or a combination thereof.

15. The abrasive article of claim 14 , wherein the body comprises for the total volume of the body:
35 vol % to 50 vol % of the abrasive particles;
10 vol % to 25 vol % of the bond material; and
25 vol % to 35 vol % of a porosity.

16. A method of forming an abrasive article comprising:
forming a mixture including:
a bond material comprising an organic material;
abrasive particles comprising nanocrystalline alumina having an average crystallite size of at least 0.01 microns and not greater than 0.16 microns; and

curing the mixture to form a fixed abrasive article,
wherein the fixed abrasive article comprises a body including for a total volume of the body:
6 vol % to 65 vol % of the abrasive particles;
5 vol % to 55 vol % of the bond material; and
8 vol % to 70 vol % of a porosity.

17. The method of claim 16 , wherein the average crystallite size is at least 0.07 microns and not greater than 0.13 microns.

18. The method of claim 16 , wherein the abrasive particles comprising nanocrystalline alumina comprise at least about 51 wt % alumina for the total weight of the particles.

19. The method of claim 16 , wherein the abrasive particles comprise at least one additive selected from the group consisting of a transition metal element, a rare-earth element, an alkali metal element, an alkaline earth metal element, silicon, and a combination thereof.

20. The method of claim 19 , wherein the abrasive particles comprising nanocrystalline alumina comprise a total content of additive of not greater than about 12 wt % for a total weight of the nanocrystalline alumina.

Assignees

• Saint Gobain Abrasives Inc
• Saint Gobain Abrasifs Sa

Inventors

• Zhong Yang
• Sarangi Nilanjan
• Yang Shu
• Bauer Ralph
• Vujcic Stefan

Classifications

• B24D3/34

  characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties · CPC title

• C09K3/1436

  Composite particles, e.g. coated particles · CPC title

• C09K3/1409 Primary

  Abrasive particles per se (preparation of diamond C01B32/25) · CPC title

• B24D3/28 Primary

  Resins {or natural or synthetic macromolecular compounds (B24D3/22 takes precedence)} · CPC title

• B24D18/00

  Manufacture of grinding tools {or other grinding devices}, e.g. wheels, not otherwise provided for · CPC title