摘要:

AbstractThe particle‐size variations of eleven shipments of commercial flint and of fifteen shipments of feldspar have been investigated as a possible cause of production variations in electrical porcelain. A correlation of sieve data with specific surface calculations based on sedimentation determinations was made on six grades of commercial flint. The Andreasen pipette sedimentation method was used for all tests except those in which the hydrometer method was employed for comparison purposes. Either of these sedimentation methods had adequate accuracy to control particle size. The percentage remaining on the 325‐mesh sieve, however, could not be correlated with the specific surface values. Particle‐size distribution was determined for each sample. To facilitate comparisons, specific surface values were calculated from a plot of the distribution data on log‐probability graph paper. The investigation included the effect of various liquid suspending media and electrolytes on the settling characteristics of flint and feldspar. Neither flint nor feldspar could be adequately dispersed in non‐polar liquids. Feldspar apparently has surface‐active characteristics that permit it to be flocculated or deflocculated, depending on the nature of the ions present in solution. An anomalous peptizability of some feldspar samples in the particle‐size range below 3 microns

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14465.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractA discussion of the occurrence of brucite in limestone, the method of extracting it in the form of magnesia, and uses for which this particular type of magnesia is best suited is presented with emphasis on the possibilities of brucite magnesia in the ceramic industry.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14466.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractEquations are given for the calculation of changes of density, refractive index, and other optical constants produced by the addition of a known relative weight of a given component to a base glass. Corresponding equations for the substitution of one component for another are also given. Values are computed and listed for the initial fractional rate of change of refractive index (nD) when various components are added to (a) pure SiO2and (b) a sodium silicate glass containing 50% of Na2O by weight.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14467.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractGraphs are presented showing the variation with atomic number and with group of the periodic table of certain constants entering into the calculation of densities, refractive indices, and dispersions of glasses.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14468.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractThis paper is a summary of the present basic information concerning the individual chemical, physical, and pyrochemical characteristics of the possible, more common soluble constituents present in porcelain enamel slips. The data were chosen with particular regard to their importance in the study of the nature and effect of the various soluble salts on properties of enamel slips and on their drying behavior.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14469.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractThe effect of soluble salts in porcelain enamel mill liquors was investigated, particularly relating to the enamel film strength and tearing tendency. The mechanism of tearing is discussed from the standpoint of the properties of the enamel slip and of dried enamel film. The related data are presented, and the application of the results of recent extensive studies of clay, water, and electrolyte systems to enamel slips is given.SummaryThe results of this investigation may be summarized in a flow sheet in which the various properties and conditions governing these properties are related to the characteristics studied. Figure 9 lists each variable in the sequence considered logical in this study.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14470.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY