摘要:

AbstractA description is given of the method used to extract beryllia, and some of the properties of the oxide are reviewed, including electrical and thermal conductivity.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14227.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractNine casting slips were prepared, using bodies of the sanitary porcelain type. The electrolyte was a combination of 60%“N” brand sodium silicate and 40% sodium carbonate. Its amount was adjusted in each body slip to produce a cast having the right characteristics according to the “feel” test; the specific gravity of each slip was constant. The grain‐size distribution of each slip was determined as well as the casting rate, consistency, and pH when the casting slips were first prepared and again after 24‐, 48‐, and 96‐hour aging periods.There is a reasonably close relation between castability and the grain‐size distribution. The pH of the body compositions differed, but there was little or no change in its value with the age of the casting slip up to 96 hours. It is concluded that the determination of grain size and pH should be of considerable aid in the control

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14228.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractThe various glaze‐fit test methods are described, and the results of the ring, flat‐plate, and tuning‐fork tests on semivitreous types of bodies and glazes are com

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14229.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractA study was made of the influence of the lime content of brick on their ability to take zinc‐green, yellow, tan, and brown glazes. Desirable greens were obtained with clays containing as much as 3% lime; those with a higher percentage of lime generally produced yellow‐greens. The probability of obtaining good greens was best on clays with more than 6% of alkalis when their absorptions after firing were below 2%. Desirable greens were not obtained on bodies which had absorptions greater than 6.7%. Firing under oxidizing conditions before flashing and slow cooling tended to promote the formation of desirable brown, tan, and straw‐colored zinc‐vapor

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14230.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractAcid salts, such as might be expected to be present in clays, reacted readily with sodium‐silicate solutions and produced marked changes in viscosity out of contact with air. Magnesium salts gave the most gelatinous and bulky precipitates.Experiments with fuller's earth and a plastic fire clay, which were free of soluble salts and were saturated with hydrogen, indicated that base‐exchange reactions may also cause hardening of silicate mixtures out of contact with air. Natural plastic fire clays, which contained negligible amounts of soluble salts, were found to harden out of contact with air when calcium and magnesium were present as exchangeable bases, but they did not harden when these bases were absent.It was found possible to prevent hardening of clay‐sodium‐silicate mixtures by subjecting the clay to a preliminary treatment with nonprecipitating sodium ions, introduced as sodium carbonate, before mixing the clay with sodium s

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14231.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractLuminous‐flame firing of natural gas in glass furnaces has been accomplished inefficiently and with, difficulty for many years in an attempt to secure the advantages of the luminosity characteristics. Luminosity in the gas flame is now secured by retardation of combustion between overlying layers of air and gas, the resulting flame being particularly adapted for glassmelting. A successful method for controlling the length and shape of the luminous flame in a glass furnace involves the mixing of spent gases from the flue with the incoming fuel ga

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14232.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractVariations in the compositions of wet‐process, leadless cast‐iron enamels were studied in the development of better enamels. The work was initiated in the laboratory and later was transferred to plant production where the enamels were developed to successful operation. The nonsintered ground coat and the colored cover enamel applied directly on the iron were particularly satisfact

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14233.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractA series of cones prepared from dicalcium ferrite and ferric oxide was fired under oxidizing conditions. The cone of composition 60% dicalcium ferrite plus 40% ferric oxide consistently showed the lowest deformation temperature (2185°F.). According to the phase diagram for the system, the eutectic should be at about 20% dicalcium ferrite and 80% iron oxide (weight per cent). A possible explanation for the difference observed may be that liquids approaching the composition of monocalcium ferrite exhibit a lower viscosity than liquids formed at the eutectic

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14234.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY