A study of the sub-system Ca 2 SiO 4 -7CaOP 2 O 5 2SiO 2 within the system Ca 3 (PO 4 ) 2 -Ca 2 SiO 4 was conducted as a preliminary step toward obtaining new biomaterials with controlled microstructures. Phase composition of the resulting ceramics was studied using X-ray diffraction and scanning electron microscopy with attached wavelength dispersive spectroscopy. The results showed that the sub-system presents an invariant eutectoid point at 518°C ± 6°C with a composition of 31 wt% Ca 3 (PO 4 ) 2 and 69 wt% Ca 2 SiO 4 , and typical eutectoid microstructure of lamellae morphology. These results are in disagreement with the previous reported data, which locate the invariant eutectoid point at 500 ± 20°C with a composition of 36.75 wt% Ca 3 (PO 4 ) 2 and 63.25 wt% Ca 2 SiO 4 . †
Ultra-high temperature ceramic composites based on carbon fibre, Cf, preforms impregnated with hafnium diboride, HfB 2 , powder and then densified with carbon by chemical vapour infiltration, CVI, have been mechanically tested to measure the room temperature flexural, interlaminar shear, compressive and tensile strengths.
Room and high temperature flexural strength and coefficient of thermal expansion (CTE) of HfB2 ultra‐high temperature ceramic (UHTC) particulate filled Cf/C composites are determined along with UHT oxidation behavior. Both room and high temperature strength of the composites were found to be broadly comparable to those of other thermal protection system materials currently being investigated. The CTE of the composites was measured both along and perpendicular to the fiber direction up to 1700°C and the values were found to depend on fiber orientation by approximately a factor of 3. Arc‐jet testing of the UHTC composites highlighted the excellent ultra‐high temperature oxidation performance of these materials.
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