摘要:

AbstractPreliminary investigations on compositions between Ca2SiO4and akermanite (Ca2Mg‐Si2C7), between merwinite (Ca3Mg(SiO4)2) and akermanite, and between merwinite and monticellite (CaMgSiO4indicate that a field of merwinite appears on the liquidus surface of the system CaO‐MgO‐SiO2and that merwinite melts incongruently at 1575 °C. to Ca2SiO4, MgO, and

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14452.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThe composition of normal as well as low‐loss steatite bodies is shown on the MgO‐Al2O3‐SiO2phase diagram. Clay‐talc bodies containing 10% or less of clay have the longest firing range. Bodies near the forsterite corner of the clinoenstatite‐forsterite‐cordierite triangle have a firing range of about 100 °C. but they are too refractory. Auxiliary fluxes, such as CaO and BaO, shorten the firing range appreciably. The alkalis lengthen it but are electrically detrimental. The RO2elements, such as SiO2and ZrO2, when added in appreciable quantities, give good firing range but an excessive increase in the refractoriness

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14453.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThe preparation of test specimens is described as well as methods employed in testing approximately seventy different talcs, including materials for commercial use and‐samples from new sources. Correlations are noted between chemical analysis and the measured physical properties, if they are present to any degre

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14454.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractA spherical calorimeter was constructed for measuring true specific heat and thermal conductivity. It was formed of two concentric spherical platinum shells, and a spherical sample was fitted into the inner shell. Electric heat was supplied at the center of the sample, and the calorimeter was housed in a spherical electric furnace.Thermal conductivity was measured by determining the inner and outer sample temperatures at steady heat flow using the equation of heat conduction in a sphere; specific heat was measured by noting the temperature rise of the sample with a known heat input while maintaining the calorimeter shells near the adiabatic condition; and a correction for heat leakage was made by using the conductivity determination to calculate this factor.Specific heat and thermal conductivity measurements were made on quartz sand, chrome refractory cement, four types of insulating firebrick, and 85% magnesia insulation over a total temperature range of 100° to 2200°F. The estimated accuracy of specific heat measurement of 3 to 5% is consistent with engineering requirements. No estimate of accuracy can be given as yet for thermal conductivity result

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14455.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThermal conductivity determinations have been made on superduty fire‐clay, silica, and kaolin refractories, using the Globar‐heated, water calorimeter apparatus previously described. The arrangement, which is satisfactory for insulating firebrick, gives considerable error when firebrick samples are tested. Results obtained by different arrangements of the guard samples and heating elements are shown as well as a final arrangement which gives a satisfactory condition of parallel heat f

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14456.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThe method previously described for determining metal precipitation during groundcoat firing on sheet iron has been refined and used in a quantitative study of the comparative influence of cobalt and nickel oxides on this precipitation. The effect of these oxides has been studied separately and in mixtures, and it has been found that nickel oxide has the more pronounced action. This action is evident even when the ratio of cobalt oxide to nickel oxide is 3 to 1.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14457.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY