Vaporization and thermodynamics of ceramics based on the La2 O3 -Y2 O3 -HfO2 system studied by the high-temperature mass spectrometric method

Rapid Communications in Mass Spectrometry : RCM
Eugene N KablovFedor N Karachevtsev

Abstract

Materials based on the La2 O3 -Y2 O3 -HfO2 system are promising for the production of highly refractory ceramics, e.g., thermal barrier coatings and molds for casting of elements of gas turbine engines. When these ceramics are synthesized or used at high temperatures, selective vaporization of components may take place, resulting in changes in the physicochemical properties of the materials. Consequently, development of materials based on the La2 O3 -Y2 O3 -HfO2 system requires information on vaporization in this system as well as on its thermodynamics, without which prediction and modeling of their physicochemical properties are impossible. Vaporization processes and thermodynamic properties in the La2 O3 -Y2 O3 -HfO2 system were studied by the high-temperature Knudsen effusion mass spectrometric method using a MS-1301 mass spectrometer. Electron ionization of vapor species was employed at an ionization energy of 25 eV. The samples under study and reference substances were vaporized from a tungsten twin effusion cell. At 2337 K the main vapor species over samples in the La2 O3 -Y2 O3 -HfO2 system were shown to be LaO, YO and O. The partial pressures of the vapor species mentioned and the La2 O3 and Y2 O3 activities in the samp...Continue Reading

References

Oct 16, 2016·Rapid Communications in Mass Spectrometry : RCM·Viktor A VorozhtcovVladimir F Sapega
Dec 14, 2016·Rapid Communications in Mass Spectrometry : RCM·Eugene N KablovYuriy I Folomeikin
May 6, 2017·Rapid Communications in Mass Spectrometry : RCM·Eugene N KablovYuriy I Folomeikin

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Citations

Jun 8, 2019·Rapid Communications in Mass Spectrometry : RCM·Eugene N KablovFedor N Karachevtsev
Feb 17, 2021·Rapid Communications in Mass Spectrometry : RCM·Valentina L StolyarovaFedor N Karachevtsev

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