Abstract: A coating for a molybdenum-based substrate that may be a bi-layer coating. The lower layer may include a first molybdenum coating compound, such as Mo5Si3, doped with from about 0 to about 10% boron and/or silicon. The upper layer may include a second molybdenum coating compound, such as MoSi2, doped with from about 0 to about 20% silicon and/or aluminum. The bi-layer coating forms a protective SiO2 surface upon high temperature exposure in oxygen-containing atmospheres. The coating is capable of providing long-term oxidation resistance to molybdenum-based substrates up to about 1400° C. An additional thermal layer may be included.

Abstract: An inventive hot gas seal comprises a sealing body and means for allowing a cooling fluid, preferably cooling air, to flow through the interior of the sealing body. Such a hot gas seal can be effectively cooled by guiding a cooling fluid through the interior of the sealing body.

Abstract: An inventive hot gas seal for sealing an opening, e.g. a gap or hole, in a heat shield element or between heat shield elements of a heat shield or a liner comprises at least one resilient portion for providing a force which is designed such that the hot gas seal can be held in said opening by said force and/or that the sealing efficiency of the hot gas seal is increased by said force. Thus, further means for holding the seal in place and/or for increasing the sealing efficiency are not necessary. The invention is particularly useful if the design of said resilient portion is such that the force provides a holding action and increases the sealing efficiency, at the same time.