NOVELTY - The injector has an inner tube defines an inner feed passage. An intermediate tube defines an intermediate feed passage. An outer tube defines an outer feed passage. The outer tube comprises an outer tube pipe portion. An outer tube tip portion is attached to one another. The outer tube tip portion is formed of a ceramic matrix composite, a sintered silicon carbide or a sintered silicon nitride. The outer tube pipe portion is formed of a metal or metal alloy. The outer tube tip portion is formed of a melt-infiltrated silicon carbide/ silicon carbide matrix composite.    USE - Feed injector for gasification system.    ADVANTAGE - The stiffness of the metal decrease as the temperature increases and thus the metal along the hotter outer surface elongate more than the metal along the cooler inner surface, resulting in an area of high thermal strain and stress. The outer tube tip portion formed of a ceramic matrix composite, a sintered silicon carbide, or a sintered silicon nitride eliminates the need for a water cooling system required by known feed injectors and thus greatly reduces the complexity and cost of manufacturing and operating the feed injector. The feed injector provides a simplified means of fastening the outer tube tip portion to the outer tube pipe portion, which facilitates quick replacement of the outer tube tip portion, when necessary, without welding of the components. The feed injector reduces the duration of such replacement and thus reduces the costly shutdown of the gasification system and the overall system. The feed injector addresses the risks of cracking, corrosion, and erosion to increase the life span of the outer tube tip portion and thus reduce the frequency of replacement.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a method for operating a feed injector of a gasification system; and    (2) an integrated gasification combined cycle power plant.    DESCRIPTION OF DRAWING(S) - The drawing shows a side plan view of feed injector.    Feed injector (200)    Upstream portion (202)    Downstream portion (204)    Outer feed passage (222)