摘要:

AbstractThe role of cobalt oxide in metal precipitation is explained on the basis of the influence of cobalt oxide on the reaction 4FeO ↔ Fe + Fe3O4. The temperature intervals during the firing cycle at which precipitation takes place and the relative rates of precipitation in ground coats of varying composition have been determined by a method of electrical conductivity at high temperature

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15184.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractTheories of thermal conductivity in single crystals of non‐metallics are given, and the apparatus used for experimentation is described. Experimental results obtained for a number of single crystals show the variation of conductivity with temperature and crystallographic direction. A minimum thermal conductivity as the temperature is increased is indicated, which agrees with the theory of A. H. Compto

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15185.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThe leaching of glass by acid or neutral solutions may be complicated by the selective adsorption of certain ions within the hydrated silica film formed on the glass surface. The rate of release of acid‐soluble elements to the attacking solution is thus not necessarily in accordance with the amounts present in the body of the glass. Society, Cincinnati, Ohio, April 22, 1942 (Glass Division). Received June 8, 194

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15186.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThe leaching of acid‐soluble oxides from a silicate glass forms a silica‐rich surface film that is permeable to further acid attack. A quantitative study has been made of the effect of baking these surface films at various temperatures. The baking decreases the permeability of the films and thus makes the glass more resistant to attack by acid soluti

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15187.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractMelting experiments, employing batch materials free from sulfur but containing pure carbon in the form of sugar, demonstrate that carbon is not retained as a colorant. The value of carbon as a reducing agent in sulfur‐bearing batches is confirmed, and the effect of iron is experimentally show

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15188.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThe conditions necessary for the formation of a clear, transparent salt glaze on structural building units are described. Laboratory trials, which were made under these conditions or slight modifications of them, were studied by means of enlarged photographs of the surfaces and thin sections of the glazes. These pictures illustrate the process of formation of the glaze and show that glazes more than 0.001 in. thick are susceptible to crazing.Salt glazes usually are formed from 0.003 to 0.004 in. thick in order to obtain a smooth brilliant glaze, but such glazes craze badly. Much better glazes may be obtained with only a sufficient number of saltings to give a glaze thickness of approximately 0.001 in., followed by a maturing or smoothing treatment in which the salting temperature is held for some time, or borax is used during the latter part of the salting and (or) the early part of the cooling period.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15189.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractA study of six brands of silicate of soda used in a typical ceramic casting slip discloses the effect of the Na2O to SiO2ratio on hydrometer readings, pH, viscosity, casting rate, water retention, drying shrinkage, dry strength, firing shrinkage, fired strength, and fired absorption. The effect of varying the amount of electrolyte both above and below that required for complete deflocculation is also reported.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15190.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY