Aesthetic parameters of highly feldspathic porcelain

• Published in: Thermochimica acta 1993-05, Vol.218, p.229-245
• Main Authors: Abdel-Fattah, Wafa I., Tera, F.M., Nour, Fa
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; feldspathic porcelain; mineralizers; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; surface topography; Translucency measurements
• ISSN: 0040-6031; 1872-762X
• DOI: 10.1016/0040-6031(93)80425-A

Parian porcelain (80% feldspar and 20% Kaolin) or (80% feldspar, 10% Kaolin and 10% quartz) and those containing BaCO 3, Al(OH) 3 or ZrSiO 4 in 5,10 and 15% we're prepared and matured. Optical measurements were performed according to the tristimulus values C.I.E. system (see Annex) and x, y and z were obtained from the reflection and transmission data of parian porcelain with mineralizers. The translucency and brightness of the specimens were calculated after normalizing with the sensitivity of human eye (the ordinary observer). Results proved increased transmittance with higher wavelength and with mineralizers. Both translucency and whiteness improved substantially with BaCO 3 while ZrSiO 4 raised opacity. The results were discussed in terms of porosity and surface topography. Resulted bodies are comparable to the transmittance-reflectance plot of some American and British porcelains.