Influence of zirconium-based alloys on manufacturing and mechanical properties of ultra high temperature ceramic matrix composites

Figures & data

Figure 1. Schematic of the RMI process.

Figure 2. Matrix micro-structure before (a) and after B${}_2$O${}_3$ infiltration (b).

Figure 3. Pore size distribution of pyrolysed polycarbosilane, phenolic resin and phenolic resin after B${}_2$O${}_3$ infiltration.

Figure 4. XRD of pyrolysed phenolic samples with and without B${}_2$O${}_3$ infiltration.

Figure 5. Carbon fibres with TiB${}_2$ coating after (a) 2h and (b) 4h CVD coating time.

Figure 6. Viscosity in dependence of temperature at three different shear rates for different melts.

Figure 7. Contact angles of different melt alloys on C and SiC substrates.

Figure 8. Matrix variations within the micro-structure when using different melts and preforms.

Figure 9. Fracture surface after 3PB of the phenolic preform for each of the three melts.

Table 1. Mechanical properties, ultimate stress ${\sigma }_U$, modulus E and ultimate strain $e_U$, of tested melt and preform combinations.

	${\sigma }_U$ [MPa]		E [GPa]		$e_U$ [%]
	PCS	PH	PCS	PH	PCS	PH
Zr${}_2$Cu-1 at.-%B	$393\pm 27$	$363\pm 10$	$147\pm 2$	$183\pm 10$	$0.39\pm 0.09$	$0.21\pm 0.01$
Zr${}_2$Ag-1 at.-%B	$134\pm 21$	$78\pm 19$	$210\pm 86$	$128\pm 10$	$0.07\pm 0.02$	$0.15\pm 0.09$
Zr${}_9$B	$190\pm 32$	$181\pm 81$	$144\pm 13$	$162\pm 25$	$0.16\pm 0.06$	$0.14\pm 0.09$

Note: polycarbosilane (PCS) and phenolic (PH).