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

In International Foru Forum on on Multifunctional Ma Mu Mate terial Sys Systems in Ex Extr treme Env Environments Develo lopment of f refr fractory composites for extr fo treme aerospace envir ironments Laura Sil La Silvestroni, Dile iletta Sci Sciti CNR-ISTEC, Faenza, IT www.istec.cnr.it I nstitute of S cience and TE chnology for C eramics Via Granarolo 64, I-48018 Faenza, Italy www.istec.cnr.it

EU EU-Proje ject: LIG IGHT-TPS Super LIG Sup LIGHT-Weight Thermal Protection Sys ystem for for space app spa application • Sc 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). • Ap Applications: thermal protection systems for different parts of space vehicles (T~1100 ° C or 1600-1800 ° C) • TR TRL from 2 to TRL 5

UHTC-based gra ranule les • Production of UHTC cohesive granules with specific size • Use: feedstock for plasma spray, secondary phases for dual composites Granulation wit Gr with PEG PEG  <25 <25  m 25<  <10 <100  m 100<  <1 <150  m 25< m 100 m 300  m 300  m 20  m 300  m Irregular, compact, full Free Fr eeze-granulation  <25 <25  m 25<  <10 <100  m 25< m 300  m 10  m Spherical, compact

Oxi xidation / / Weight is issue Production of UHTC coatings for C/C, SiC/C composites by SPS. As-deposited Shr Shrouded ed Pl Plasma Spr Spray 1 Substrate Heat and momentum transfer Spraying gun Bumpy, dusty, partially porous 300 μ m 2 Energy source: thermal plasma Irregular, partially porous Powder feedstock 3 Smooth, adherent, fully dense, fine grained As-deposited After flame test Optimized UHTC granules 2 μ m 50 μ m • Improved cohesion commercial ZrB 2 ZrB 2 – WC • Selected m.g.s.