An accurate method of measuring vaporization coefficients will be very useful to each of these disciplines: Cosmochemistry,Evaporative Vapor Deposition, Durability of Ceramics at High Temperatures, Fundamental Vaporization Studies and Theoretical Models. Refining and further developing this measurement approach will be of interest in each area and should lead to further funding, particularly in the cosmochemistry area where vaporization coefficients may explain phenomena dealing with elementary vaporization and condensation/accretion processes. The project plans to demonstrate new method for measurement of VC and measure VC for complex oxides of interest to cosmochemistry and as structural materials.
Evaluation of a new method for measurement of VC using multi-Knudsen cell mass spectrometerMore »
Evaporative Vapor Deposition: Here a container of a source oxide to be deposited on a substrate is heated to a high temperature. The substrate is placed in a region of cooler temperatures. It is necessary to know the vapor pressure generated by the source oxide, which is calculated via tabulated thermodynamic vapor pressures and vaporization coefficients.
Durability of Ceramics at High Temperatures: Often the limiting factor in applying ceramics at very high temperatures is their vaporization characteristics. Accurate lifetime modeling requires tabulated thermodynamic data and vaporization coefficients.
Fundamental Vaporization Studies and Theoretical Models: According to the terrace-ledge-kink (TLK) theory of vaporization, the molecules form an adsorbed layer before leading the solid surface. The vaporization coefficient is indicative of kinetic barriers to the formation of this layer and subsequent desorption. Such information will be useful to molecular dynamics models of vaporization.More »
|Organizations Performing Work||Role||Type||Location|
|Glenn Research Center (GRC)||Lead Organization||NASA Center||Cleveland, OH|