摘要:

AbstractTwo English and six American ball clays, representative of the ball clays in use in the whiteware industry, were tested to determine certain properties including plasticity, bulk specific gravity, volume shrinkage, transverse strength, and apparent porosity. The tests were conducted to observe the effect of electrodialysis and replacement of the cations which had been adsorbed by the clays in their natural state with other cations. Of the various cations substituted, Na+and K+were the most effective in altering certain physical properties such as plasticity and strength.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb14313.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractSpecimens of commercial casting slip were cast in plaster molds, porous bisque molds, and porous bisque molds treated with calcium and aluminum chloride. A qualitative determination of the ion serving in the exchange position is possible by the evaluation of the yield value of the cast specimen. The results on a series of tests indicate that casting clayware may be carried out by one of two processes, namely, mechanical water removal by the porous mold or by an exchange reaction between the ions of the slip and those of the mold; combinations of both processes may also occur. A detailed description of both methods, including practical applications, is given.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb14314.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractSix monodisperse fractions of kaolinite were prepared, and the exchange capacity was determined from the viscosity relations on additions of NaOH to the electrodialyzed fractions. A linear relationship is shown to exist between the surface area and the base‐exchange capacity for all of the sizes studie

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb14315.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractThe use of combined treatments was found to Ix more efficient in improving the properties of clays than individual treatments, and the best results were obtained when the clay was pugged with steam and hot water with an addition of 0.2% of soda ash. This process lowered the water of plasticity 26%, the drying shrinkage 58%, arid the absorption 46.5%. The dry and fired strengths were increased 123% and 144%, respectively.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb14316.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractThe objective of these experiments was to determine (1) the linear changes in expansion arid shrinkage during firing, (2) the effect of compressive loading on these changes, and (3) the variations in strength at furnace temperatures during the firing of some typical shales and fire clays used for the manufacture of structural clay product.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb14317.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractThe addition of small amounts of iron oxide (0.1 to 0.2%) to soda‐lime‐silica glass batches exerts a profound influence in increasing the output of glassmelting tanks as well as in favoring the production of higher quality glass. The color produced by this addition, moreover, is not objectionable for many uses of the ware.The accelerated melting rate probably is the result of a chemical effect of iron oxide in the batch and a physical property possessed by such glass to absorb radiation from the flames more efficiently. Attempts to measure these effects were made by rioting the melting rate of glasses which contain varying additions of iron oxide and by determining the temperature gradient that exists in glass when it is melted in a miniature tank. The presence of iron oxide aids melting and fining in crucible melts at 1200°C., but no effect was observed at higher temperatures. The measurement of temperature gradients in a pot holding 45 lb. of glass and heated by flames passing over the glass surface showed that the temperature gradient increases with iron oxide con

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb14318.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY