An apparatus is provided for a gas turbine engine. This gas turbine engine apparatus includes a hot section structure of the gas turbine engine. The hot section structure is configured with a plurality of surfaces respectively forming boundaries of a gas path through the hot section structure. The surfaces include a first surface and a second surface. The hot section structure includes metal and thermal barrier material. The first surface is formed by the metal. The second surface is formed by the thermal barrier material.

A gas turbine engine has a compressor section including a lower pressure compressor and a higher pressure compressor, and a turbine section. A core engine housing surrounds the compressor section and the turbine section. An outer intermediate housing wall defines an internal chamber between the core housing and the outer intermediate housing. A fan rotor and a fan casing surround the fan rotor to define a bypass duct between the fan case and the outer intermediate housing. A heat exchanger is mounted in the internal chamber and receives high pressure air for cooling the high pressure air and delivering the high pressure air into the core engine housing to be utilized as cooling air for a component. Air from the lower pressure compressor is utilized to cool the higher pressure air in the heat exchanger.

A rotary device for a nuclear power facility, the rotary device being placed in a circuit for coolant containing radioactive nuclides in the nuclear power facility. The rotary device includes: a casing; and a rotary mechanism provided with, in the casing, a rotor and a rotor shaft that come into contact with the coolant containing the radioactive nuclides passing through the casing. Regarding the casing and the rotary mechanism, at least the rotor and the rotor shaft of the rotary mechanism comprise a low-effective diffusion coefficient alloy having a lower effective diffusion coefficient than a polycrystalline alloy.

A ceramic matrix composite (CMC) center body may be positioned around an austenitic nickel-chromium-based superalloy attachment ring. The attachment ring may be integrally formed with a turbine engine case. The attachment ring may have a greater coefficient of thermal expansion than the center body. A plurality of pins may be inserted through apertures in the center body and coupled to the attachment ring. The pins may slide within the apertures, allowing the attachment ring to expand without applying a load on the center body.

An Ni base forged alloy is easy to make hot forging and miniaturization of crystal grains while excellent high-temperature strength and segregation property are compatible. The Ni base forged alloy has solid solution temperature of a precipitation strengthening phase lower than or equal to 970 C., difference in the solid solution temperature between a -phase and the precipitation strength phase larger than or equal to 50 C., Al of 0.5 to 1.0%, Cr of 17 to 21%, Fe of 17 to 19%, Nb of 4.5 to 5.5%, Ti of 0.8 to 1.3%, W of 3.0 to 6.0%, B of 0.001 to 0.03%, C of 0.001 to 0.1% and Mo of 1.0% or less in mass percentage [%] and remainder made of Ni and inevitable impurities.

An aft clamp ring for a gas turbine engine is disclosed. The aft clamp ring includes a body, a forward sealing face, and an aft sealing face. The body includes an annular shape extending between an outer end and an inner end. The forward sealing face faces in a second axial direction. The aft sealing face is adjacent the outer end facing in a first axial direction and is at least partially radially aligned with the forward sealing face. The forward sealing face and the aft sealing face are each an annular surface with a surface area from 105.50 cm.sup.2 to 165.19 cm.sup.2.

A heat-resistant cast steel includes, based on a total weight of the heat-resistant cast steel, 0.2 to 0.4 wt % carbon; 0.5 to 1.0 wt % silicon; 0.3 to 0.8 wt % manganese; 0.7 to 1.0 wt % nickel; 17 to 23 wt % chromium; 0.5 to 1.0 wt % niobium; 1.5 to 2.0 wt % tungsten; 0.2 to 0.5 wt % vanadium; 0.05 to 0.1 wt % cerium; 0.05 to 0.1 wt % nitrogen; and a balance of iron.