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Better material properties at higher temperature

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Better material properties at higher temperature

Better material properties at higher temperature

ID: F1601-01

Experts developed functionally graded Mo/Mo silicide composites based on refractory steel skeleton embedded in a refractory silicide matrix especially directed for high-temperature (HT) corrosive environments. Material properties change from area to core due to responses occurring as the material is created. The area, automotive and energy sectors demand ever-more functional and high-performance materials capable of withstanding harsh environments. In addition, they want them at reasonable cost. A European consortium of research institutes, universities and commercial partners from five nations features met that demand. Scientists developed novel in-situ formed HT composites comprising the concept of functionally graded materials (FGMs). Porous skeletons of refractory metal (molybdenum or niobium) have actually been embedded in a silicide matrix via stress assisted reactive infiltration. Grading is achieved because silicide forming reactions between Si melt and refractory steel happen predominantly at the area, creating an oxidation-resistant skin. The innovative reactive infiltration technique for preparing complex, near-net shaped parts with a self-forming oxide coating is a novel proprietary process. The novel FGM revealed significantly enhanced oxidation resistance at HT contrasted to a traditional molybdenum alloy and much greater fracture toughness at low temperatures compared to traditional silicides. The desired synergy provides the brand new HT composites enhanced properties whenever compared with currently most widely utilized nickel based superalloys. Technology was shown effectively on three different components, among which was a room framework for mounting thermal protection sheets. The composite survived thermal surprise resistance testing, simulating spacecraft re-entry conditions. Aside from the materials and manufacturing technologies, models describing effect kinetics in the molybdenum-silicide system represent a major contribution to manufacturers. They effectively simulate both fluid and solid state responses and the effects of barrier coatings on kinetics. FGMs are functionally superior to currently used superalloys and are created with an industrially legitimate manufacturing strategy. They promise crucial benefits for both atmosphere and ground transportation. Lighter and more durable elements capable of withstanding harsher conditions will facilitate reduced gas consumption and less emissions.

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