Patent ID: 9011620
Filing Date: 2015-04-21
Classification: B23K,C04B,C10G,Y10T

Abstract:
1. A method of fabricating a joint between two materials in an apparatus comprising transitioning from a first material A to a first metal material B wherein first material A and first metal material B are chemically and thermomechanically incompatible at a temperature of operation of said apparatus, said method comprising: i) a first transitioning of said first material A to a second material C, wherein second material C is compatible at the temperature of operation of said apparatus with both first material A and first metal material B, said first transitioning between first material A and second material C is graded to provide a gradation starting with 100 percent first material A and having a continuous compositional change in the amount of first material A and second material C until there is 100 percent of second material C having a coefficient of thermal expansion which substantially grades between the first material A and second material C; and ii) a second transitioning of said second material C to the first metal material B, said second transitioning between the second material C and first metal material B is graded to provide a gradation starting with 100 percent second material C and having a continuous compositional change in the amount of second material C and first metal material B until there is 100 percent of first metal material B having a coefficient of thermal expansion which substantially grades between the second material C and the first metal material B, wherein first material A is silicon carbide based, first metal material B is iron chromium nickel based, and second material C is alumina and the proviso that said joint contains at least two gradations.