NDLI: Synthesis, Ceramic Conversion and Microstructure Analysis of Zirconium Modified Polycarbosilane

Content Provider	Springer Nature Link
Author	Vijay, V. Vipin Nair, Sandhya G. Sreejith, K. J. Devasia, Renjith
Copyright Year	2015
Abstract	Polymer derived ceramics have been widely being explored as high temperature structural components in aerospace as rocket nozzles, nose tip and leading edges of reusable launch vehicles. Polycarbosilane (PCS) was modified by a condensation reaction with zirconium acetylacetonate [Zr(acac)$_{4}$] to form polyzirconocarbosilane (PZrCS). A series of PZrCS were synthesized, which could be transformed into Si–Zr–C ceramic phases on pyrolysis. The ceramic yield of PCS was significantly improved by the introduction of zirconium into the system. The XRD patterns of the PZrCs show the characteristic peaks of −SiC at 1300 °C and at 1500 °C the characteristic peaks of ZrC and ZrO$_{2}$ were observed. The carbothermal reaction in PZrCS was completed at 1650 °C and the resulting ceramic was non-oxide SiC/ZrC phase. The SEM images proved that the increase in concentration of zirconium in the final ceramic decreases the surface uniformity. HRTEM analysis of PZrCS heat treated at 1650 °C shows the evolution of oxide free ZrC/SiC phase with compatible grain boundaries without stacking fault. It could be concluded that the technique of introducing ultra-high temperature ceramic phases into the SiC matrix is an effective approach to improve the high-temperature performance of silicon based ceramics.
Starting Page	302
Ending Page	311
Page Count	10
File Format	PDF
ISSN	15741443
Journal	Journal of Inorganic and Organometallic Polymers and Materials
Volume Number	26
Issue Number	2
e-ISSN	15741451
Language	English
Publisher	Springer US
Publisher Date	2015-12-23
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polycarbosilane Polyzirconiumcarbosilane Si–Zr–C HR-TEM Inorganic Chemistry Organic Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Polymers and Plastics

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