Diamond grid CMP pad dresser
First Claim
1. A method of making a chemical mechanical polishing (CMP) pad dresser comprising the steps of:
- a) providing a substrate member;
b) placing a template having a predetermined pattern of apertures formed therein on a sheet of braze alloy;
c) filling the apertures of the template with abrasive particles;
d) removing any abrasive particles which are not in a template aperture;
e) pressing the abrasive particles contained in the apertures into the sheet of braze alloy, such that said abrasive particles become partially embedded in the braze alloy;
f) removing the template, such that the abrasive particles remain in place on the sheet of braze alloy; and
g) attaching the sheet of braze alloy containing the abrasive particles to the substrate.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention discloses a CMP pad dresser which has a plurality of uniformly spaced abrasive particles protruding therefrom. The abrasive particles are super hard materials, and are typically diamond, polycrystalline diamond (PCD), cubic boron nitride (cBN), or polycrystalline cubic boron nitride(PcBN). The abrasive particles are brazed to a substrate which may be then coated with an additional anti-corrosive layer. The anti-corrosive layer is usually a diamond or diamond-like carbon which is coated over the surface of the disk to prevent erosion of the brazing alloy by the chemical slurry used in conjunction with the CMP pad. This immunity to chemical attack allows the CMP pad dresser to dress the pad while it is polishing a workpiece. In addition to even spacing on the substrate, the abrasive particles extend for a uniform distance away from the substrate, allowing for even grooming or dressing of a CMP pad both in vertical and horizontal directions. A method of producing such a CMP pad dresser is also disclosed.
-
Citations
24 Claims
-
1. A method of making a chemical mechanical polishing (CMP) pad dresser comprising the steps of:
-
a) providing a substrate member;
b) placing a template having a predetermined pattern of apertures formed therein on a sheet of braze alloy;
c) filling the apertures of the template with abrasive particles;
d) removing any abrasive particles which are not in a template aperture;
e) pressing the abrasive particles contained in the apertures into the sheet of braze alloy, such that said abrasive particles become partially embedded in the braze alloy;
f) removing the template, such that the abrasive particles remain in place on the sheet of braze alloy; and
g) attaching the sheet of braze alloy containing the abrasive particles to the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method of making a chemical mechanical polishing (CMP) pad dresser comprising the steps of:
-
a) providing a substrate member;
b) uniformly spacing a plurality of abrasive particles upon a surface of said substrate; and
c) affixing said abrasive particles to the substrate such that each abrasive particle extends within about 50 micrometers of a predetermined uniform height above the substrate.
-
-
20. A method of making a chemical mechanical polishing (CMP) pad dresser comprising the steps of:
-
a) providing a substrate member;
b) uniformly spacing a plurality of abrasive particles upon a surface of said substrate;
c) affixing said abrasive particles to the substrate such that each abrasive particle extends to a predetermined height above the substrate member; and
d) coating said abrasive particles and said braze alloy with an anti-corrosive layer. - View Dependent Claims (21, 22, 23)
-
-
24. The CMP pad dresser making method of 20, wherein said coating step is accomplished using a cathodic arc method.
Specification