摘要:

AbstractThe difficulty of defining the vitreous state in a rigorous manner, the existence of many borderline cases, and the theoretical requirements which must be met if a substance is to be vitreous are discussed. Silicate glasses and certain other typical classes of vitreous substances are treated in some detail with especial reference to the relation between their structures and vitreous properties.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15180.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractLaboratory gradients are presented for glasses of different colors and coloring agents when heated at the surface to a temperature of 2615°F. The gradients in commercial tanks are related to these laboratory‐tank experiments. Ferrous iron and chromic oxide yield the largest gradients, whereas selenium, cerium, and very small amounts of cobalt give small gradients. Ferric iron gives a largc gradient and manganese a relatively low gradient. Iron sulfur ambers are intermediate. Visible color or color intensity is no indication of the temperature gradien

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15181.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractNorth Carolina olivine was melted in the electric arc‐resistance furnace, with simultaneous reduction of the iron (fayalite) components, to form a product consisting essentially of crystalline forsterite. The forsterite obtained from olivine by reduction was contaminated by clinoenstatite or a siliceous glass unless MgO or CaO was added to the charge. Silica, present in excess of orthosilicate proportions, was not eliminated by carbon reduction. Simultaneous reduction or vaporization of MgO prevented increase in the MgO to SiO2ratio by carbon reaction. Addition of theoretical amounts of MgO to the melt to produce forsterite completely eliminated the clinoenstatite and siliceous glass and resulted in an abrupt increase in high‐temperature load‐bearing strength. The presence of lime was detrimental to high‐temperature load‐bearing

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15182.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThis condensed report covers the development of a commercial glaze using cheap, nonessential materials in maximum amount. The results meet fully the more expensive glaze which is no longer available.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15183.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY