Methods for masking a pin chuck, and articles made thereby
A method for selectively coating the tops of pins of a pin chuck with a high thermal stability material, such as diamond-like carbon (DLC). Non-pin areas (“valleys”) of the pin chuck support surface are temporarily covered with glass frit or glass beads during the DLC coating operation. After coating, the glass frit/beads masking material may be removed, leaving the DLC material selectively coating the pin tops. The selective DLC coating avoids the cracking or warping problems due to CTE mismatch when DLC is coated over the entire pin chuck support surface, as the pin chuck material typically is very different from DLC.
1. An article for supporting and clamping a component for processing, comprising:
a) a plurality of pins extending from a chuck support surface, each pin having a terminal end, where said terminal end of each pin collectively define a plane; and
b) at least one layer of a plurality of bodies each no larger than about 1000 microns covering said chuck support surface between pins, and not covering said terminal surface, wherein said plurality of bodies is in the form of beads.
2. In a chuck for supporting and clamping a component for processing, a method of selectively coating a terminal surface of substantially each of a plurality of pins extending from a support surface of said chuck, said method comprising:
(a) providing a chuck having a support surface populated with a plurality of pins;
(b) covering said chuck support surface other than said terminal surface of said pins, with at least one layer of a plurality of bodies;
(c) coating substantially all of said chuck support surface and terminal surfaces of pins that extends from said chuck support surface with diamond-like carbon; and
(d) removing said plurality of bodies from contact with said chuck support surface.
3. The method of claim 2 , wherein said plurality of bodies is in the form of a slurry including a binder.
4. The method of either of claim 3 , where the binder in the slurry is UV curable.
5. The method of claim 4 , further comprising selectively curing the binder of the mixture that is located on the upper surface of the pin chuck between pins, and not located on pin tops, and then removing uncured binder.
6. The method of claim 2 , wherein said plurality of bodies include glass, and are fused to form a frit.
7. The method of claim 2 , wherein said chuck is a vacuum chuck having a vacuum seal land, and further wherein said plurality of bodies is in the form of loose beads.
8. The method of claim 7 , wherein said vacuum seal land forms a wall to confine said loose beads.
9. A chuck for supporting and clamping a component for processing, comprising a plurality of pins extending from a chuck support surface, each pin having a terminal end coated with diamond-like carbon, further comprising a layer of a metal disposed on said diamond-like carbon coating, said metal having a thermal expansion coefficient not greater than about 6 ppm/K.
10. The chuck of claim 9 , wherein said metal comprises a nickel-iron alloy.