Processability of high temperature

One of the initial attempts of exhaust gas reforming, as well as onboard H2 generation, was reported by Newkirk and Abel. Their process of high-temperature, non-catalytic SR of gasoline resulted in carbon formation in the reformer however, their objective, to reduce emissions by feeding H2 to the gasoline engine, was achieved. 

Cebezon Perez N, Garcia Lloret T, Redondo de Pedro M. Intoxication por litio desencadenada por un proceso febril. A proposito de un caso. [Lithium intoxication triggered by a process of high temperature. Concerning a case.] Aten Primaria 2005 36 344-5. 

Processing of High-Temperature Ceramic Superconductors Structure and Properties... 

Pure oxygen-less melts contain no oxide ions in any form, and, therefore, such pure melts cannot serve as donors of O2-. The melts, which are solvents of the second kind, can affect acid-base interaction on their background in two manners by fixation of oxide ions entering in the melt and by solvation of the conjugate acid or base. However, the ionic solvents of the second kind, used in practice for different measurements and applied purposes, contain admixtures of oxide-ion donors, which are formed in the melt from initial admixtures of oxo-anions such as SO4-, COf- or OH-. The second way of appearance of oxide ion admixtures in molten media is characteristic of the melts based on alkali metal halides the process of high-temperature hydrolysis of the said halide melts results in the formation of hydroxide ions and, after their dissociation, of oxide ions ... 

Rybkin and Nesterenko used the same experimental routine to investigate the processes of high-temperature hydrolysis and oxidation of solid and fused sodium iodide [256,257], According to the authors estimation, the enthalpies of the following reactions... 

Equations (3.48) and (3.49) are written in terms of variables that can be measured relatively easily, although it is assumed that the diffusion coefficient is a function of the chemical potential of the species involved. Thus, in order to be able to calculate values of the parabolic rate constant, the relevant diffusion coefficient must be known as a function of the chemical potential of the mobile species. Such data are frequently not available or are incomplete. Furthermore, it is usually easier to measure the parabolic rate constant directly than to carry out experiments to measure the diffusion data. Thus, the real value of Wagner s analysis lies in providing a complete mechanistic understanding of the process of high-temperature oxidation under the conditions set out. 

The stable sub-boundaries are of major significance in the process of high-temperature strain for pure metals and solid solutions. The upper stress limit of the sub-boimdary stability depends upon metal properties and temperature. The lower the shear modulus fi and the higher temperature, the lower the limit. An inactivated emission of dislocations from sub-boimdaries occurs when the applied external stress is higher than about 2 x 10 . Then the sub-boimdaries break up. 

For adhesive applications, thermal stability alone is insufficient. Processability of high-temperature polymers is of great importance. These polymers should be processed under moderate conditions with no volatile evolution. The adhesives should be compatible with adherends and should have good, durable properties. For broader uses, the manufacturing cost should be low because cost, so far, has been the major obstacle to developing high-temperature adhesives. 

Department of Chemistry - Institute of Chemical Engineering and Chemical Processes of High Temperatures, University of Patras, P.O. Box 1414, University Campus, GR 26 500 Patras, Greece. 

From the practical point of view, a rather high specific activity of MA samples of perovskites comparable with that of pure C03O4 and Mn304 allows not only to maintain a process of high-temperature combustion, but also to ignite it at start-up conditions. 

A dense and electronically insulating layer of L1A102 is not suitable for providing corrosion resistance to the cell current collectors because these components must remain electrically conductive. The typical materials used for this application are 316 stainless steel and Ni plated stainless steels. However, materials with better corrosion resistance are required for long-term operation of MCFCs. Research is continuing to understand the corrosion processes of high-temperature alloys in molten carbonate salts under both fuel gas and oxidizing gas environments (29, 28) and to identify improved alloys (30) for MCFCs. Stainless steels such as Type 310 and 446 have demonstrated better corrosion resistance than Type 316 in corrosion tests (30). 

---