ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb14287.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractLead‐containing raw glazes were applied on biscuit tile and fired at cones 02, 2, and 4. The glaze body interface was examined microscopically by preparing thin cross sections. The powdered glassy portion was also investigated.Because the crystals separating at the interface were frequently too small for satisfactory study, a technique for promoting their growth was used. Anorthite, wollasto‐nite, gehlenite, undissolved quartz, tridymite, and cristobalite were observed.The effects of altering the bases and the alumina and silica content of the glaze were studied, and the amount and the effect of the solution of the body were examined. The authors conclude that the interfacial layer is not necessarily intermediate in expansion cond

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb14288.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractThe mechanical properties of plastic clay masses were investigated in terms of the fundamental concepts, stress and strain, and the interpretation involved the general terms, plasticity and workability. Compressive forces, applied by means of newly designed apparatus, were used throughout. A description is given of the apparatus as well as of the results for twelve different bodies, five individual clays, and five clayflint mixtures. In addition to composition, the factors investigated were the effect of water content, aging, rate of stress application, and cyclic loading. It was found that “moisture equivalent,” that is, the moisture content required for an arbitrarily selected equilibrium stress value, is a satisfactory parameter for the comparison of the plastic properties of clays and of similar body compositions. Aging increased the plasticity of ball clays progressively, whereas the china clays and a porcelain body became more workable. Increasing the rate of stress application caused progressive increases in the equilibrium stress. On the basis of the results obtained, a practical method of distinguishing between plasticity and workability is presen

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb14289.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractThis investigation was conducted for the purpose of determining whether iron oxide affected the tensile strength of enamel. The results indicate that ferric oxide appreciably reduces the enamel strength and ferrous oxide may have an even greater effect. The possible relation of chipping of the enamel to the iron oxide content is noted.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb14290.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY