摘要:

AbstractTo study the effect of molten aluminum on refractory brick with a view toward explaining some of the brick failures in aluminum melting furnaces, the following test was conducted. Brick of different compositions and from various manufacturers were placed on end in the bottom of an electrically heated ladle to which molten aluminum was added. After holding the molten aluminum in contact with the brick for thirty‐five days, it was poured out and the ladle was allowed to cool slowly to room temperature.A study of the brick revealed that some failed by penetration of the aluminum into the brick accompanied by a reaction between the aluminum and the brick. This penetration was less with the denser brick than with the more porous ones. Of the brick tested, there was the least reaction between aluminum and the chrome brick and most between aluminum and silica brick. Many other factors, however, must be considered when deciding which brick is the most economical to use in aluminum meltin

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14221.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractX‐ray studies show that lightly calcined magnesite is cryptocrystalline, with an atomic structure identical with that of periclase and fused magnesi

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14222.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractThis discussion covers a study of the refractory properties of the olivine from two large deposits in Washington. The research was devoted mainly to (a) physical, chemical, and mineralogical properties, (b) effect of chemical additions, (c) development of the densest and most refractory body, (d) manufacture of brick, (e) comparison of these brick in P.C.E., spalling, load test, absorption, and resistance to basic slags with other brick, and (f) local use of olivine as a foundry sand.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14223.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractThe rates of diffusion,R, of helium through four glasses of varied composition have been measured as a function of temperature up to and including the “transformation points” of the glasses. Two borosilicates, a lead glass, and a soda glass were studied, and the effect of heat treatment was investigated. A plot of logRvs. 1/T, in general, proved to be made up partly of a straight line and partly of a curving line at temperatures where the glass became soft enough to relieve strain. The borosilicates showed either no break or only a slight break at the “transformation point,” whereas the lead and soda glasses showed more pronounced changes in slope near the “transformation point.” The borosilicates showed a shift to higher rates with heat treatment; and the lead glass, a shift to lower rates. It is believed that completely annealed glass would show a linear logRvs. 1/Trelation over the entire temperature range.The permeability of the glass to the diffusion of helium at any temperature decreases as the percentage of basic oxides or of cations increases. This may be interpreted in terms of the atomic arrangement in th

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14224.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractBottle surface tests with alcoholic solutions of various strengths and with distilled water show that corrosion decreases with increasing alcoholic concentration. The tendency to form flakes usually, though not always, decreases with increasing alcoholic concentration. The results show no relation that will hold for all glass bottle compositions between extraction values with distilled water in any accelerated test and extraction values or the tendency to form flakes in neutral alcoholic solutions.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14225.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractMathematical proof is presented that the wind pressure on a round stack is two‐thirds that of a square stack with the wind square to one side. A reconsideration is given of a stack section1where tension occurred, and a correction is presented. A convenient method and its application is also given for calculating the stability of a kiln stack upon the soil. The application of the “kern” theorem is discussed, using the kern for theworstcondition, viz., with wind blowingdiagonallyagainst a square

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14226.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY