Science and Technology

Russian scientists are testing a new composite for aircraft construction

Image: Publicity / Superjet International.

Composite elements and constructions can cut back the ultimate weight of the aircraft and in the end cut back gas consumption. This reduces the price of working the aircraft and its affect on the surroundings. However, most carbon fiber composites right this moment are based mostly on epoxy resin and different non-fusible, insoluble and non-recyclable supplies.

Russian scientists, for their half, introduced that they’ve created a new composite materials based mostly on superstructural thermoplastic polymers and carbon fibers, which successfully preserves its operational properties below the affect of an aggressive surroundings equivalent to jet gas and on the identical time is well recyclable. The research was revealed in an trade journal.

“Carbon fiber is a distinctive materials composed virtually solely of carbon atoms. High mechanical energy with low weight, excessive temperature resistance and glorious corrosion resistance have ensured its vast utility in high-tech industries equivalent to rocket science, aviation, construction and medication. Carbon fiber strengthened composite supplies are notably wanted within the aviation trade. stated the press service of MISiS.

“The researchers used carbon fiber produced in Russia as a reinforcing materials. For the manufacturing of the matrix, as an alternative of the standard epoxy resin in these circumstances, polyethersulfone powder was used for the primary time. It is an amorphous thermoplastic polymer proof against excessive temperatures, steam and varied chemical substances and has glorious mechanical properties. It’s additionally vital that polyethersulfone is recyclable, not like epoxy.”defined a college consultant.

The researchers chosen one of the best situations for acquiring a composite materials and located that the perfect carbon fiber content material for polyethersulfone-based aircraft composites is 60 to 70% of the full mass of the construction.

The floor of the carbon fibers was additional modified by thermal oxidation, which led to the formation of a skinny layer on the floor of the carbon fibers containing a giant variety of oxygen-containing purposeful teams, which promoted higher adhesion of the carbon fibers to the polymer matrix.

For the impregnation of the carbon preform, as an alternative of the standard high-pressure soften impregnation of the polymer, a resolution know-how was used – the polyethersulfone powder was first dissolved with an natural solvent at room temperature, then the fiber-modified carbon was impregnated with the ensuing resolution.

The prototypes have been then dried at a temperature of 100°C for 4 hours, after which the preform was positioned in a mould the place the construction was lastly fashioned below strain at a temperature of 350°C for half-hour.

The use of modified carbon fibers made it doable to acquire a secure construction of the ensuing composite and considerably enhance its mechanical properties and resistance to excessive temperatures. At the identical time, because the authors of the research notice, the proposed know-how for creating composites based mostly on polyethersulfone and carbon fibers permits to manage the properties of the ultimate materials relying on the diploma of filling of the polymer matrix with fibers.

The new materials continues to be being studied, so there isn’t any estimate when it will likely be put into manufacturing or used within the aviation trade.

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