Turbine Shroud Abradable Materials Evaluation.

摘要

Transpiration-cooled gas turbine shroud structures were designed,built,and tested. The structures consisted of two layers of porous metal attached to an air distribution substrate. The permeability of the inner porous layer was controlled to limit and distribute the cooling air. The outer porous layer was made in a manner which permitted control of its abradability. The inner porous layer was made from a nickel-chromium alloy. Ceramic protected nickel-chromium,nickel-chromium-aluminum,and nickel-chromium-aluminum-titanium alloys were used in various samples for the outer porous layer. The samples were tested for oxidation resistance,rub tolerance,and cooling effectiveness at temperatures up to 1900F. The nickel-chromium-aluminum and nickel-chromium-aluminum-titanium alloys demonstrated properties desirable for this type of application.