Patent ID: 6931709
Filing Date: 2005-08-23
Classification: G01V,Y10T

Abstract:
1. A method of attaching a first member of one of quartz and a ceramic to a metal member to form a joined structure, the first member being a substantially cylindrical member, the method comprising: creating a hole of substantially circular cross-section in said metal member, the hole having a diameter that is smaller in size than the diameter of the first member over a temperature range of the joined structure in use; heating the metal member to a temperature sufficient to expand the hole to allow insertion of said first member in the hole; inserting a portion of said first member into said hole; and cooling the metal member to form the joined structure of the first member and the metal member, wherein forming said hole further comprises forming a hole having a diameter that smoothly and progressively reduces in diameter toward the interior thereof, from a diameter at a mouth of the hole of at least the diameter of the first member over said temperature range to said diameter that is smaller in size than said first member in the hole, thereby reducing tensile stress gradients in the first member of the joined structure.