ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18908.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

ForewordIt was with a feeling of deep humility that I received the invitation to be the Edward Orton, Jr., Fellow Lecturer this year. Every year, when the program of the Annual Meeting is announced inThe Bulletin, my first interest in it is the Orton Lecture, and the significant honor bestowed upon the man chosen to give it.The availability of the literature of The American Ceramic Society to me when I was graduated from high school and began to work in an art pottery helped me to decide to go to college and to choose the course in ceramics at Ohio State University. In doing so, I was very fortunate in having been closely associated with Doctor Orton both as a student and as an instructor. We became friends, and this friendship continued through the years. I am very grateful to have this opportunity to acknowledge the assistance and counsel of Edward Orton, Jr., and his associates.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18909.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractAn analysis of the significance of bacteria as a factor in slip control based on actual plant experiences is given. It is shown that variations of some magnitude in the properties of casting slip can occur as a result of bacterial action.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18910.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractThe effects of the major and some minor constituents on the melting and fining characteristics of amber and flint container glasses are discussed. The constituents investigated were silica, alumina, lime, magnesia, soda, fluorine, barium oxide, and sulfates. The effects were measured by seed count, visual analysis, and low‐temperature viscosity. Curves of fining time and low‐temperature viscosity characteristics are prese

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18911.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractTwenty‐one enameled specimens were exposed for approximately tea months in an industrial area arid were graded visually by ten observers for weather resistance based on appearance change as compared with an unexposed standard. Weight‐loss data were obtained on exposure to boiling solutions of (1) distilled water, (2) 6% citric acid, and (3) 5% sodium pyrophosphate. Acid‐resistance data were obtained by employing the Porcelain Enamel Institute research test. These data were correlated with the weather‐resistance gradings. Loss of weight on exposure to boiling 6%; citric acid appeared to give the best indication of weather res

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18912.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractAttempts were made to correlate the physical properties of fire‐clay refractories with the phenomenon of low‐temperature spalling. A method of considerable promise was developed in which the relative flexural strength of fire‐clay refractories at 1500°F., in the notched and unnotched condition, indicated the resistance of these bodies to low‐temperature spalling. No purely mathematical relationship between the physical properties and low‐temperature spalling characteristics appeared t

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18913.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractA relatively large molybdenum‐wound resistor furnace, a diamond‐wheel rod‐grinding machine, a tensile stress‐rupture machine, and thermal‐expansion equipment used for the development and testing of cermets are described. All are additions to equipment described previously, having been designed and used successfully during the

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18914.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractExperiments concerning the influence of asymmetrical units on the surface properties of glasses, sponsored by the Mechanics and Materials Branch of the Office of Naval Research, led to a better understanding of the surface structure of crystalline solids A picture is advanced which indicates a close similarity between the atomic structure of the surface layer of a crystal and that of a glass. Common to both are certain characteristic features, namely, the inconstancy of (a) the coordination number, (b) the inter‐nuclear distances, and (c) the bond angles.The difference between the surface structure and the interior of a crystal depends on the polarization properties of the ions A schematic representation of the distribution of bond strength in ideal and real crystals, in glasses, and in surface films brings out the similarity between the surface of crystals and the structure of glasses.Based on this picture, a number of apparently unrelated phenomena are discussed and explained: (1) devitrification of the glass surface, (2) effect of imperfections on the transformation of crystals (silica brick), (3) sinteririg of highly refractory oxides. (4) dielectric constant of polycrystalline materials, and (5) electric absorption of stratified dielectri

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18915.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY