Process for making a low electrical resistivity, high purity aluminum nitride electrostatic chuck
First Claim
1. A process for making a high purity aluminum nitride electrostatic chuck, comprising the steps of:
- a) providing a sintered body comprising polycrystalline aluminum nitride having an electrode embedded therein, said body being at a temperature of greater than about 850°
C., andb) cooling the sintered body in a nitrogen-deficient atmosphere to cause transport of nitrogen out of the polycrystalline aluminum nitride and to effect a selected nitrogen vacancy population in the polycrystalline aluminum nitride.
1 Assignment
0 Petitions
Accused Products
Abstract
A controlled dielectric loss, sintered aluminum nitride body having a density of greater than about 95% theoretical, a thermal conductivity of greater than about 100 W/m-K, and a dissipation factor measured at room temperature at about 1 KHz selected from:
(a) less than or equal to about 0.001; and
(b) greater than or equal to about 0.01.
A process for producing a controlled dielectric loss, sintered aluminum nitride body, comprising heat treating an aluminum nitride body at sintering temperatures, including providing a heat treatment atmosphere which effects a selected nitrogen vacancy population in the aluminum nitride body at the sintering temperatures, and cooling the aluminum nitride body from sintering temperatures at a controlled rate and in a cooling atmosphere effective to control the selected nitrogen vacancy population.
45 Citations
10 Claims
-
1. A process for making a high purity aluminum nitride electrostatic chuck, comprising the steps of:
-
a) providing a sintered body comprising polycrystalline aluminum nitride having an electrode embedded therein, said body being at a temperature of greater than about 850°
C., andb) cooling the sintered body in a nitrogen-deficient atmosphere to cause transport of nitrogen out of the polycrystalline aluminum nitride and to effect a selected nitrogen vacancy population in the polycrystalline aluminum nitride. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A process for making a high purity aluminum nitride electrostatic chuck, comprising the steps of:
-
a) providing a mixture comprising; i) a raw powder comprising aluminum nitride, and ii) an electrode embedded in the raw powder, b) sintering the mixture to produce a polycrystalline sintered aluminum nitride body having an electrode embedded therein, and c) cooling the sintered body in a nitrogen deficient atmosphere to cause transport of nitrogen out of the polycrystalline aluminum nitride and to effect a selected nitrogen vacancy population in the polycrystalline aluminum nitride.
-
Specification