THE VAPORIZATION AND PHYSICAL PROPERTIES OF CERTAIN REFRACTORIES. PART II. EXPERIMENTAL STUDIES
Abstract
Vapor pressure-temperature relationships for Ir, Rh, Ru, Ir plus C, alumina, thoria, and hafnia were studied by simple effusion and mass spectrometric methods. Vapor phase species were identified. Vapor pressure data and derived heats of vaporization and reaction are presented. The vaporization modes of the rare earth sesquioxides were studied mass spectroscopically. Data demonstrate that the mode of vaporization of these materials is strongly dependent upon the number of electrons in the 4f shell of the rare earth metal. Continuously monitored effusion experiments conducted on the Mo-Si system yielded heats of dissociation. Continuously monitored experiments on the W-Si system yielded approximate dissociation pressures. The surface tensions of silica and silica plus 1% oxide additives and Zr plus U, pure silica, silica plus 1% V2O5, silica plus 1% CoO and silica plus 1% Al2O3 were determined. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1962
- Accession Number
- AD0290812
Entities
People
- A.a. Hasapis
- A.j. Melveger