摘要:

AbstractChemical durability results obtained by tests on crushed samples and bottle surfaces on a variety of commercial glass‐bottle compositions show the difficulties encountered in attempting to correlate accelerated tests with the actual performance of the bottles toward various solutions under service conditions. The results obtained thus far indicate that the value of accelerated tests conducted with distilled water as a leaching medium is questionable as an aid in predicting resistance of various glass compositions to neutral solutions at room temperatur

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14184.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractPower factor measurements at frequencies of 100, 500, 1500, and 5000 kilocycles were made on a series of soda‐lime‐silica glasses and on another series of glasses, starting with a base glass of the composition of 17.4% Na2O, 10.1% CaO, 72.5% SiO2(or 1.4 Na2O to 0.9 CaO to 6.0 SiO2), to which 0.030 gram‐atom of various elements in the form of their oxides were added. In the first series, the power factor for all glasses measured decreased with increasing frequency and increased markedly with increase in Na2O content. In the second series, the power factor decreased with increasing frequency as in the case of the first series. An increase in power factor was produced by additions of Zr, Na, and Al oxides, and a decrease was produced by additions of the oxides of Si, V, Zn, Mg, B, Ti, Co, Ca, Ce, Ni, Mn, Fe, Ba, Pb, Li,

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14185.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractSurface tension measurements have been made on a series of both calcite and dolomite lime glasses by using a modified dipping cylinder method. The measurements cover the temperature range from 1100° to 1400°C. and the viscosity range from logarithm viscosity = 1.65 to logarithm viscosity = 3.30 (45 to 2000 poises). Measurements on ordinary liquids, of known surface tensions were made for check purposes.The results obtained on the glasses agree well with published data obtained by the maximum bubble‐pressure method. The temperature coefficient of surface tension is approximately —0.02 dyne per cm. per degree C. The surface tension of glass at a particular temperature may be represented as a linear function of composition on a mol. fraction

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14186.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractA rapid procedure is described for determining quartz in refractory clays by fusion in potassium bisulfate and subsequently by dissolving precipitated silica with a hot caustic solution. Data are included on the quartz content of several clays.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14187.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractAn electrically heated furnace and a method to apply loads to full‐size insulating firebrick heated throughout to thermal equilibrium are described. Sixteen commercial brands of insulating firebrick of various use limits were tested under several loads over a range of temperatures. No correlation was found to exist between the weight and the resistance to hot loading or between the cold crushing strength and the hot load‐bearing capac

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14188.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractFour Illinois pottery clays, representing two extreme types and two intermediate types, are described. Porosity and thermal expansion tests were made on the raw and fired clays. The temperature of the inversion of low to high cristobalite in these clays is much lower than is usually accepted for the lower limit of this inversion because cristobalite is formed at low temperatures. A limited amount of data was obtained on the volume changes of raw clays during firing, the organic matter content, and thermal dissociation.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14189.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractGround‐coat enamel was first applied on one side and then on each side of 26‐, 20‐, 18‐, 10‐, and 6‐gauge enameling stock, and the strengths of the pieces were determined in cross bending. The results show a decided increase in strength for the enameled specimens over that of the stock before enameling. An increase in the thickness of the enamel also increases the strength within limits. The effect on the lighter gauges is greater than on the heavy gauges, and the strength is greater when the enamel is under compression than un

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14190.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY