ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14307.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractThe0‐phenanthroline method for the colorimetric determination of iron has been adapted to the analysis of glass sand. The sample taken for analysis was decomposed by treatment with HF and H2SO4, followed by fusions of any insoluble material with Na2CO3and finally with K2S2O7. An aliquot was then adjusted to the proper pH by a simple procedure, the iron reduced by hydroxylamine hydrochloride, the0‐phenanthroline complex formed, and the transmittancy of the solution measured spectrophotometrically. The method is simple and rapid, and compares favorably in precision and accuracy with other available meth

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14308.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractColor changes of three titanium enamels given varied firing treatment were investigated. The size and shape of titanium oxide particles were studied with the electron microscope, the relative amounts of anatase and rutile were determined from X‐ray analyses, and spectrophotometric curves of the fired panels were made.Electron micrographs showed that rutile particles recrystallized as needles or “sticks,” whereas anatase appeared as ill‐defined, irregularly shaped, rounded particles. With increasing firing temperature or firing time (1) rutile particles showed a greater increase in size than anatase particles, (2) the amount (by weight or volume) of anatase crystals decreased and the amount of rutile crystals increased, and (3) a color change from blue‐white to cream‐white was observed.The change in color seemed to be related to the scattering of blue light by small particles at lower temperatures or shorter periods of firing. As the size of opacifying particles increased, the scattering of blue light decreased, and the characteristic absorption of visible light in the shorter wave lengths was more apparent. In enamels containing both anatase and rutile, the smaller anatase crystals were predominant at lower and the larger rutile crystals at higher temperatures, so that sharp changes of color were observed as the firing temperature wa

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14309.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractThe thermal behavior of kaolinite was studied by electron microscopy and X‐ray diffraction. This study has shown that hexagonal‐shaped particles persist far above the dehydration temperature of kaolinite. It was concluded that two stages of reaction represent the steps in the firing of kaolinite. First, the chemically combined water is removed, resulting in the formation of a uniquely organized, noncrystalline compound. Second, the noncrystalline compound collapses into crystalline mullite nuclei which exhibit normal gro

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14310.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractIn the course of investigations made in connection with the development of titania‐opacified enamels, it was observed that color, reflectance, and acid resistance were influenced by the clay used in the mill additions. In a subsequent search for a clay which would produce the best over‐all enamel properties, a study of the effects of twenty clays of different types was made under standardized conditions of milling, spraying, and firing. Coatings sprayed at 30 gm. per sq. ft. were examined for bisque strength, brushing behavior, and tearing. After firing for 3 minutes at 1540°F., and at 1640°F., the reflectance, color, gloss, and acid resistance of the enamels were observed. It has been concluded that the success or failure of an enamel is determined to an important degree by the clay used in the mill add

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14311.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14312.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY