High-Temperature Ceramic Matrix Composite with High Corrosion Resistance

摘要

This report results from a contract tasking Institute for Problems of Materials Science as follows: In this Project the new composites of ZrB2-SiC system will be created, their structure and high-temperature mechanical and corrosion properties will be studied up to 1600 C. The effect of (Zr, Mo)Si2 additives on both high-temperature corrosion resistance and high-temperature strength of composites above will be investigated. The new technologies of protective coatings will be developed with the use of thermal-chemical and also electrochemical (polarization) methods. The results obtained will be used for the development of a model of high-temperature oxidation of chosen ceramic systems. We are planning in this Project the obtaining of dense composites by activated sintering under pressure (hot pressing) using nanosized row materials with MoSi2 additives. Low porosity, composition modification and protective coating formation at high-temperature treatment will provide high level of strength and enhanced corrosion resistance. This Project also supposes the development of theoretical speculation for high-temperature oxidation parameters determination using both specific models and experimental kinetic curves of oxide layer growth for the systems under study. Such modeling concerns the peculiarities of oxide layer formation at the scale-ceramic substrate boundary including the investigation of oxide layers stability as to pittings, voids and other real scale defects. As a result of Project fulfillment a new knowledge for structural state and properties of ceramic composites management techniques will be obtained. So, new structural ceramic materials with higher working temperatures will be developed and studied in details.