Ternary ceramics oxides

Ventures into Ceramic Oxides— Simple Binary and Ternary... 

Abstract Refractory oxides encompass a broad range of unary, binary, and ternary ceramic compounds that can be used in structural, insulating, and other applications. The chemical bonds that provide cohesive energy to the crystalline solids also influence properties such as thermal expansion coefficient, thermal conductivity, elastic modulus, and heat capacity. This chapter provides a historical perspective on the use of refractory oxide materials, reviews applications for refractory oxides, overviews fundamental structure-property relations, describes typical processing routes, and summarizes the properties of these materials. 

The salient properties of this layered ternary ceramic are good damage tolerance, good machinabUity, low density and excellent thermal shock and oxidation resistance. Such unique properties make it possible to use Ti3AlC2 in structural components for high-temperature applications and as oxidation-resistant coatings. 

Refractory oxides are an important class of materials that enable processes to exploit extreme environments. A wide variety of unary, binary, and ternary oxides can be considered refractory, based on their melting temperatures. Refractory oxides are generally prepared from powdered precursors using standard ceramic forming techniques such as casting, pressing, or extrusion, and subsequently sintered to achieve final density. In addition to chemical compatibility, the physical properties of refractory oxides such as thermal expansion coefficient, thermal conductivity, modulus of elasticity, and heat capacity must be considered when selecting an oxide for a specific application. 

A number of ternary oxide ceramics have been obtained following precursor concept." " For example, stoichiometric MgAl204 films were successfully prepared from magnesium-aluminum isopropoxide containing appropriate Mg Al ratio (1 2). Similarly, mixed metal acetates of general formula M3Fe6... 

Navrotsky, A., Systematic trends and prediction of enthalpies of formation of refractory lanthanide and actinide ternary oxide phases, Ceram. Trans., 119, (2001), 137-146. 

---