摘要:

AbstractCross sections through defects that were encountered in different plants were studied for the possible causes of the trouble. The defects that were traceable to some faulty condition in the iron are reported. It was found that hairlines, depressed lines, and blisters in the enamel may originate from some unusual condition in the metal before enameling.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1939.tb19478.x

出版商:Blackwell Publishing Ltd    

年代:1939

数据来源: WILEY

摘要:

AbstractA furnace is described in which uniform heat treatment and slag application is given to panels of test brick by means of a rotating gas burner through which the slag is fed in powdered form. Temperature gradients in the test panels and some test data are given.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1939.tb19479.x

出版商:Blackwell Publishing Ltd    

年代:1939

数据来源: WILEY

摘要:

AbstractThe Irwin consistometer is used to determine the effect of various clays, electrolytes, opacifiers, finenesses of grinding, time of aging, percentage of water addition, and increase of Epsom salts additions and temperatures on ground‐coat, cover‐coat, and acid‐resisting enamel slips. All results are represented in curve form on consistency graphs, which determine the relative yield value and mobility of the respective

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1939.tb19480.x

出版商:Blackwell Publishing Ltd    

年代:1939

数据来源: WILEY

摘要:

AbstractThe stresses developed by five glazes in the field of cone 9 porcelain glazes were determined by the tuning fork method of Blakely. A reaction between the body and glaze at the interface causes a development of stress above the softening point of the glaze. The mat glaze studied showed no crazing even though it was extremely high in tension, whereas a semimat and clear glaze, lower in tension, showed craze marks.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1939.tb19481.x

出版商:Blackwell Publishing Ltd    

年代:1939

数据来源: WILEY

摘要:

AbstractA careful study of the viscosities of glasses composed of silica and between 22 and 40% soda shows that viscosity‐composition isotherms are smooth curves. The sharp minima at about 34% Na2O (and possibly at about 26% Na2O) observed by Preston1are found to be entirely absent. Neither time nor shearing stress has any effect upon observed viscosities in the region investigated as long as temperature constancy has been established. A study of deviations,i.e., of individual points from the smooth isotherms, shows that these are all within the expected limits of experimental erro

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1939.tb19482.x

出版商:Blackwell Publishing Ltd    

年代:1939

数据来源: WILEY

摘要:

AbstractVanadium, as a glass colorant, acts much like chromium. Ordinarily it leads to green tints which are due to the superposition of the green of trivalent vanadium and the yellow of pentavalent vanadium. Large excess of alkali leads to the formation of colorless vanadates. Under special conditions, solarization may be used to develop the lavender color of bivalent vanadium. The effect of melting conditions and changes in the base glass composition on the colors is discussed.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1939.tb19483.x

出版商:Blackwell Publishing Ltd    

年代:1939

数据来源: WILEY

摘要:

AbstractThe effect of the substitution of Al2O3for the oxides of sodium, calcium, and silicon on the liquidus temperatures and phase relations has been determined for glasses lying within the composition range Na2O 11 to 19%, CaO 6 to 18%, SiO259 to 79%, and Al2O30 to 8%. The results on 137 individual determinations show that the substitution of Al2O3for CaO permits wollastonite to be the primary phase in glasses of relatively low CaO content. As the Al2O3content increases, the Na2O‐3CaO‐6SiO2—CaO·SiO2boundary shifts to lower CaO contents, and the decomposition of Na2O·3CaO·6SiO2to CaO·‐SiO2takes place at lower temperatures. In compositions with tridymite as a primary phase, the substitution of Al2O3for SiO2is effective in lowering the liquidus temperature. For the composition range investigated, the SiO2‐CaO‐SiO2and Na2O·3CaO·6SiO2‐SiO2boundary remains at essentially the same SiO2content for all glasses containing not

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1939.tb19484.x

出版商:Blackwell Publishing Ltd    

年代:1939

数据来源: WILEY

摘要:

AbstractHard refractory coatings with good adherence were produced on fire brick by spraying a slip composed of clay and aluminum powder on the samples and firing. Similar coatings were produced by spraying molten aluminum on fire brick. The hardness probably is produced by heat developed from aluminothermic reactions between the aluminum and clay, and the strong adherence is caused by similar reactions between the aluminum and fireclay brick. These reactions were found to start between 750° to 930°C, and the heat generated may raise the temperature of the coating up to 1500°C in five minutes. The coatings increased the resistance of fireclay refractories to attack from basic slags but caused acid slags to corrode them more than where no coatings were employ

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1939.tb19485.x

出版商:Blackwell Publishing Ltd    

年代:1939

数据来源: WILEY

摘要:

AbstractDiaspora clay, under conditions of equilibrium, forms corundum and gamma alumina at 400°C. The gamma alumina gradually changes to corundum at higher temperatures, part of which combines with free silica to form mullite at about 1150°. Between 400° and 750°, there is a gradual increase in the size of the corundum unit cell as determined by X‐ray crystal analysis, which, upon continued heating at higher temperatures, gradually reduces to the true dimensions of cor

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1939.tb19486.x

出版商:Blackwell Publishing Ltd    

年代:1939

数据来源: WILEY