摘要:

AbstractExperiments were conducted on porcelain enamels using the accelerated weather test developed at the National Bureau of Standards. A comparison of results indicates this test to be a promising solution to the problem of the rapid determination of the weather resistance of porcelain enamel.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15212.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThis report on the utilization of domestic materials as replacements for India kyanite has been divided into four parts, namely, (I) kyanite and other high‐grade refractories, (II) effect of heat on kyanite and topaz, and (III) load resistance of refractories at elevated temperatures; (IV) will be published late

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15213.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractAn introductory study was made of diffusion into glass from salts, with silver nitrate as the chief source of diffusing particles. The optimum test conditions were a temperature of 900°C. and a test time of 108 hours. The results noted were (1) effect of time, (2) effect of temperature on the distance of diffusion, (3) variation of silver concentrations in the glass with the distance of diffusion, and (4) a check of Fick's law of diffusion. The concentration gradient of silver from a diffusing interface was determined with the use of a spectrograph and corresponding particle sizes with an ultramicroscope. In addition to the silver nitrate, a number of other salts were tested at several temperatures. The development of Liesegang rings was noted in some of the samples. The nature of diffusion in glass was deduced from the results

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15214.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractA study of the mechanical strains present in a sample of glass does not insure a prediction of the future behavior of this glass. There is no simple relation between such strains and the physicochemical state of the glass. Most of these states, in fact, probably may be obtained with or without birefringence, depending on the thermal treatment to which the glass was submitted. If the glass is not in the equilibrium condition for the temperature at which it is being used, it will transform spontaneously toward that equilibrium, The birth and evolution of strains depend on these physicochemical unbalances as well as on other characteristics of the glass. Only the study of the physico‐chemical state can give reliable indications of the behavior of glass in practical us

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15215.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY