Develo lopment of f refr fractory composites for extr fo treme - - PowerPoint PPT Presentation

www.istec.cnr.it

Develo lopment of f refr fractory composites fo for extr treme aerospace envir ironments

Institute of Science and TEchnology for Ceramics Via Granarolo 64, I-48018 Faenza, Italy www.istec.cnr.it

La Laura Sil Silvestroni, Dile iletta Sci Sciti

CNR-ISTEC, Faenza, IT

In International Foru Forum on

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Mu Multifunctional Ma Mate terial Sys Systems in Ex Extr treme Env Environments

EU EU-Proje ject: LIG IGHT-TPS

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Scope: develop, manufacture and test 1) super-light reusable TPS made of novel Ni/Cr and Nb honeycomb frames, 2) corrosion and oxidation resistant bulk UHTCs for construction elements and 3) the UHTC coatings on non-metallic materials (C/SiC,C/C).

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Applications: thermal protection systems for different parts of space vehicles (T~1100°C or 1600-1800°C)

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TRL from 2 to TRL 5 Sup Super LIG LIGHT-Weight Thermal Protection Sys ystem for for spa space app application

UHTC-based gra ranule les

• Production of UHTC cohesive granules with specific size
• Use: feedstock for plasma spray, secondary phases for dual composites

Fr Free eeze-granulation

<25 <25 m 25< 25< <10 <100 m m

300 m 300 m 300 m 300 m 20 m

<25 <25 m 25< 25< <10 <100 m m 100 100< <1 <150 m m

Gr Granulation wit with PEG PEG

Irregular, compact, full Spherical, compact

10 m

Spraying gun Powder feedstock Heat and momentum transfer Substrate Energy source: thermal plasma

Shr Shrouded ed Pl Plasma Spr Spray

Oxi xidation / / Weight is issue

Production of UHTC coatings for C/C, SiC/C composites by SPS.

• Improved cohesion
• Selected m.g.s.

Optimized UHTC granules

50 μm

Bumpy, dusty, partially porous Irregular, partially porous As-deposited

1 2 3

300 μm 2 μm

Smooth, adherent, fully dense, fine grained commercial ZrB2 ZrB2 – WC As-deposited After flame test