ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18900.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractA kinetic test for evaluating the adherence of molten glass to metal was devised. The results are expressed in terms of the highest metal temperature at which a drop of molten glass shows no adherence. This temperature was determined for several cast irons and nonferrous metals and alloys. It was found that this temperature was affected by the structure and surface roughness of the metals investigated. The effects of cyaniding, carburizing, nitriding, quenching, and annealing were determined. The general effect of mold lubricants on the adherence temperature is indicated.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18901.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractA photometric method for determining nickel on nickel‐coated steel is described. The method is very rapid, requiring less than 5 minutes. The standard deviation (σ) has been found to be 0.0028 gm. of nickel per sq. ft. when testing a sheet carrying 0.10 gm. of nickel per sq. ft. The sample is obtained by dissolving the nickel coating on a small area with dilute nitric acid. The nitric acid is confined by using a weighted rubber ring and is withdrawn by suction into a 200‐ml. Erlenmeyer flask marked at 200 ml. A large excess of ammonium hydroxide is added, followed by ammonium persulfate and dimethylglyoxime. The solution is diluted to 200 ml. with water. After filtering off the ferric hydroxide, the intensity of the red color, which is proportional to the amount of nickel present, is measured by means of a photoelectric photom

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18902.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractTests were made to determine whether or not glass windows would be of value in preventing building damage from internal explosions involving combustible dusts or vapors It was found that the effective strength of glass panes increases in an approximate linear ratio with increased rate of pressure application. It was concluded that window glass is of dubious value for explosion venting purposes, except possibly for explosions of high pressure but of very short duration, such as those that might occur if small quantities of high explosive were placed relatively near the windows.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18903.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractA vacuum induction furnace for high‐temperature research is described. With the use of molybdenum units, temperatures up to 2300°C. may be obtain

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18904.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractQuartz and cristobalite types of AlPO4were prepared in a pure condition and compared with silica regarding thermal behavior. The thermal expansion of the cristobalite type of AlPO4is remarkably similar to that of cristobalite, indicating a close structural relationship at elevated temperatures as well as at room temperature. The temperature of inversion of the cristobalite type of AlPO4apparently depends on previous thermal history, as in the case of cristobalite, but the presence of a double endothermic peak during the low‐high inversion may indicate that the mechanism is different from that involved in the low‐high cristobalite transition. Data on the thermal expansion of the network structures NaAlSiO4(carnegieite) and Na2CaSiO4are presented and are discussed in the light of the known structural relationships in the series high cristobalite, high carnegieite, and Na2CaS

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18905.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractAn investigation was conducted to develop a white opaque low‐expansion glaze of suitable gloss and texture for commercial application on zircon porcelain. A glaze containing the alkaline‐earth zirconium silicates was selected as the base glaze; batch changes and molecular adjustments were then made. On a molecular basis the KNaO content should be low (less than 0.20 equivalent); the alkaline‐earth oxides should be used to raise the RO group to 1.00. High MgO (from 0.40 to 0.50 equivalent) definitely reduces crazing tendencies; CaO and ZnO complete the RO group. The most desirable Al2O3and SiO2content is 0.3 to 0.4 and 3.0 to 4.0 equivalents, respectively. The Al2O3‐SiO2ratio considerably affects the finish and texture of the fired glaze. From 0.5 to 0.7 equivalent of ZrO2gives satisfactory opacity and improves crazing resistance; B2O3, although important as a low‐expansion constituent, is limited to 0.2 equivalent. The compositions of glazes applicable to typical zircon porcelain bodies

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18906.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18907.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY