Shaped abrasive particles and methods of forming same

• US 9,783,718 B2
• Filed: 09/30/2014
• Issued: 10/10/2017
• Est. Priority Date: 09/30/2013
• Status: Active Grant

• Current Assignee: Saint-Gobain Ceramics & Plastics Incorporated (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Ceramics & Plastics Incorporated (Compagnie De Saint-Gobain)
• Inventors: Stevenson, Adam J., M'Barki, Amin, Louapre, David, Yener, Doruk O., Czerepinski, Jennifer H., Nahas, Nabil
• Primary Examiner(s): Olsen, Kaj K
• Assistant Examiner(s): Christie, Ross J
• Application Number:
  US14/502,562
• Publication Number:
  US 20150089881A1
• Time in Patent Office: 1,106 Days
• Field of Search: None
• CPC Class Codes: C09K 3/1409 Abrasive particles per se preparation of diamond C01B32/25
• CPC Class Codes: Y02P 10/25 Process efficiency

Abstract

A method of forming a shaped abrasive particle having a body formed by an additive manufacturing process.

Claims

1. A method of forming a shaped abrasive particle having a body, the method comprising:

depositing a print material from a nozzle to a target using an additive manufacturing process to form the body of the shaped abrasive particle, wherein the print material comprises a viscosity of at least about 4×

10³ Pa s; and

controlling a dispense gap defining a distance between the nozzle and the target, wherein the dispense gap is not greater than about 10 W, wherein “

W”

represents the width of the nozzle, and wherein controlling the dispense gap includes varying a Z-directional distance between the nozzle and the target based upon at least one of the nozzle tip length, the nozzle width, the deposition pressure, the deposition rate, the deposition volume, the deposition position, the filling pattern of the print material, the dynamic yield stress (σ

d) of the print material, the static yield stress (σ

s) of the print material, the yield stress ratio (σ

d/σ

s) of the print material, and the viscosity of the print material.

2. The method of claim 1, wherein the additive manufacturing process includes forming the body by shaping the print material without use of a production tool.

3. The method of claim 1, wherein depositing the print material comprises depositing a plurality of discrete portions of the print material in a controlled, non-random manner relative to each other.

4. The method of claim 3, wherein depositing a plurality of discrete portions of the body in a controlled, non-random manner relative to each other includes deposition of the plurality of portions into a production tool.

5. The method of claim 1, wherein the additive manufacturing process comprises at least one process selected from the group consisting of layer additive method, light photopolymerization, laser powder forming, powder bed fusion, selective laser sintering, micro-laser sintering, material extrusion robocasting, material jetting, and sheet lamination.

6. The method of claim 1, wherein depositing the print material comprises:

depositing a first print material as a first portion of the body at a first time; and

depositing a second print material as a second portion of the body distinct from the first portion at a second time.

7. The method of claim 6, wherein the first portion has a different hardness, porosity, composition, or combination thereof than the second portion.

8. The method of claim 1, wherein the nozzle comprises a nozzle width not greater than about 100 microns, a tip length of not greater than about 10 mm, and an aspect ratio value (width/tip length) of not greater than about 0.8.

9. The method of claim 1, wherein the body comprises a corner roundness of not greater than about 100 microns.

10. A method of forming a shaped abrasive particle having a body, wherein forming the body comprises:

depositing a print material from a nozzle to a target using an additive manufacturing process, wherein the additive manufacturing process includes depositing a plurality of discrete portions of print material in a controlled, non-random manner relative to each other in a filling pattern, and wherein the print material comprises a viscosity of at least about 4×

10<sup>−

3</sup> Pa·

s; and

controlling a dispense gap defining a distance between the nozzle and the target wherein the dispense gap is not greater than about 10 W, wherein “

W”

represents the width of the nozzle,

wherein depositing the print material comprises depositing a first print material as a first portion of the body at a first time; and

depositing a second print material as a second portion of the body distinct from the first portion at a second time; and

wherein depositing the print material comprises using an outside-in filling process, an inside-out filling process, a side-to-side filling process, a bottom-up filling process, or a combination thereof.

11. The method of claim 10, wherein the additive manufacturing process includes forming a body of a shaped abrasive particle by shaping a raw material without use of a production tool.

12. The method of claim 10, wherein the additive manufacturing process includes forming a body of a shaped abrasive particle by depositing a plurality of discrete portions in a controlled, non-random manner relative to each other.

13. The method of claim 12, wherein depositing a plurality of discrete portions of the body in a controlled, non-random manner relative to each other includes deposition of the plurality of portions into a production tool.

14. The method of claim 10, wherein the additive manufacturing process comprises at least one process selected from the group consisting of layer additive method, light photopolymerization, laser powder forming, powder bed fusion, selective laser sintering, micro-laser sintering, material extrusion robocasting, material jetting, sheet lamination, and a combination thereof.

15. The method of claim 10, wherein the first portion can have a hardness, a porosity, a composition, or a combination thereof different than the second portion.

16. The method of claim 10, wherein the method of forming the body further comprises depositing the print material from a nozzle, wherein the movement of the nozzle is controlled by a computer program and the nozzle comprises a nozzle width not greater than about 100 microns, a tip length of not greater than about 10 mm, and an aspect ratio value (width/tip length) of not greater than about 0.8.

17. The method of claim 10, wherein controlling the dispense gap includes varying a Z-directional distance between the nozzle and the target based upon at least one of the nozzle tip length, the nozzle width, the deposition pressure, the deposition rate, the deposition volume, the deposition position, the filling pattern of the print material, the dynamic yield stress (σ

d) of the print material, the static yield stress (σ

s) of the print material, the yield stress ratio (σ

d/σ

s) of the print material, the viscosity of the print material, and a combination thereof.

18. The method of claim 10, wherein the body comprises a corner roundness of not greater than about 100 microns.

19. A method of forming a shaped abrasive particle having a body, the method comprising:

depositing a print material from a nozzle to a target using an additive manufacturing process to form the body of the shaped abrasive particle, wherein depositing the print material comprises depositing a plurality of discrete portions of the print material in a controlled, non-random manner relative to each other, and wherein the print material comprises a viscosity of at least about 4×

10³ Pa s; and

controlling a dispense gap defining a distance between the nozzle and the target, wherein the dispense gap is not greater than about 10 W, wherein “

W”

represents the width of the nozzle;

wherein the nozzle comprises a nozzle width not greater than about 100 microns, a tip length of not greater than about 10 mm, and an aspect ratio value (width/tip length) of not greater than about 0.8; and

wherein the body comprises a corner roundness of not greater than about 100 microns.