| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
Using a Reactive Hydrogen Atmosphere to attain Polymer-Derived SiCN ceramics |
| Author(s) |
Akshada Hande, Peter Kroll |
| On-Site Speaker (Planned) |
Akshada Hande |
| Abstract Scope |
We compare the impact of hydrogen and nitrogen atmosphere during the processing of Durazane 1800(PSZ20). Visual differences appear in bulk and powdered samples. FTIR spectroscopy performed on H2-pyrolyzed samples indicates the persistence of carbidic carbon integrated into the SiCN host structure. Complementary Raman analysis supports the presence of graphitic segregations in N2-pyrolyzed samples but does not indicate similar constituents in H2-pyrolyzed samples. Subsequent additional annealing at 1300 °C and 1500 °C under Ar converts the amorphous SiCN into poly-crystalline ceramics. Phase analysis by XRD shows that N2-pyrolyzed samples further annealed under Ar, completes the carbothermal reduction and yields silicon carbide(SiC). In contrast, H2-pyrolyzed sample further annealed in Ar results in a SiC and silicon nitride (Si3N4), with a carbothermal reduction being significantly delayed even at 1500°C. We show that the amount of excess carbon present in the chosen SiCN-polymer can be tailored using hydrogen atmosphere during pyrolysis. |