Patent ID: 7147910
Filing Date: 2006-12-12
Classification: C04B,C23C,C30B,Y10T

Abstract:
1. An article for use in the production of semiconductors, the article comprising a first plurality of layers containing pyrolytic boron nitride (PBN) and a second plurality of layers containing PBN and at least one elemental dopant selected from the group of elements in groups 1–6 of the periodic table of elements, alkali metal(s), alkaline earth metal(s), transition metal(s) and rare earth metal(s) or combinations thereof, wherein said second plurality of layers separating some or all of the first plurality of layers, wherein the dopant in the second plurality of layers being present in a sufficient concentration to induce peeling upon a build up of internal stress along a fracture plane in at least one of the second plurality of layers, and wherein said dopant being present on both sides of the fracture plane.