ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18955.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractA theoretical relationship between the color and thickness of thin films of amorphous silica was established. An acid‐resistance test based on this relationship was developed and applied in the testing of enamelware.According to the results obtained thus far, the color changes that are actually brought about by chemical attack agree with those which should occur theoretically. The test method thus appears to be fundamentally sound, at least insofar as this point is concerned.Its application in the testing of an enamel at different temperatures, as well as in the testing of various types of enamels at constant temperature, appears to afford satisfactory results. Enamel No. 41, when exposed for 48 hours to a solution of 20% hydrochloric acid at 60°F., developed according to this method of test a film about 675 a.u. thick. At 100°F. the film reached a thickness of about 2550 a.u. In the constant‐temperature tests the various types of enamels developed films in two hours that ranged from 60 to 2750 a.u. in thic

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18956.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractA discussion of hypotheses concerning the development of gold ruby, silver yellow, and copper ruby colors in silicate glass is presented. Experiments are described which were designed to determine whether gold dissolves in molten silicate glasses in an oxidized (ionic) state or as uncombined metal. Results are believed to prove that gold dissolves as ions rather than in the metallic state. Similar conclusions apply to silver and copper. The metal coloration results from reduction of the metal ions to insoluble metal at low temperatures, the reducing agent being Sn+2, or other polyvalent ions, as postulated by Badger, Weyl, and Rudow and by Dietzel.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18957.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractReactions of pure BeO and SiO2were investigated at temperatures ranging from 1300° to 1700 °C. The synthesis and decomposition of phenacite were studied using willemite as an additive. A phase diagram is tentatively proposed on the basis of data obtaine

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18958.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractIn silicate analysis, quinaldic acid is more selective than 8‐hydroxyquinoline or 8‐hydrosyquinaldine as a reagent for zinc in the presence of aluminum, titanium, iron, calcium, and magnesium. Zinc can be separated from these metals and the filtrate used for their determination without interference from an excess of quinaldic a

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18959.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractWarpage tendencies of thinner wall tile were considered, and the practicability of producing wall tile 1/8 in. thick was investigated. The maximum permissible warpage was taken as 0.4%, which corresponds to the allowable warpage in the Simplified Practice Recommendation of the National Bureau of Standards. Wall tile 1/8 in. thick were produced successfully from both high‐talc and high‐pyrophyllite bodies. A unique method of measuring the warpage of wall tile is presented, which may have considerable applicat

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18960.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY

摘要:

AbstractMany applications of ceramic insulators used in electron tubes subject the ceramic to temperatures of several hundred degrees centigrade and to high‐frequency electric fields. At the higher radio frequencies the dielectric heating in the insulator often becomes great enough to cause the insulator to fail.This paper describes a method of measuring the dielectric constant and power factor versus temperature for glasses and ceramics at 100 mc. per second. Measurements are given for certain ceramics at temperatures up to 500 °C. and are compared with measurements made at 15 mc. per seco

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1949.tb18961.x

出版商:Blackwell Publishing Ltd    

年代:1949

数据来源: WILEY