ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1952.tb13068.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

摘要:

Mortar compositions containing monoaluminum phosphate and monomagnesium phosphate have been investigated. Five compositions developed have been tested for workability, water retention, strength, shrinkage, and appearance in mortar joints at temperatures up to 1500°C. Results obtained indicated that these mortars are equivalent to or superior to commercial mortars for which comparable data are available in the literature. It was found that retardation of phosphate bond migration by ground clay decreased bond strength

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1952.tb13069.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

摘要:

The discovery of the thermal contraction of β‐eucryptite has introduced some new problems regarding the basic assumptions upon which previous thermal expansion theory has been based. These problems are presented together with a discussion of the chemical control of the thermal expansion of β‐eucryptite‐β‐spodumene solid solutions. The relationship of the solid solutions to the physical control of the thermal expansion of ceramic mixtures is

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1952.tb13070.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

摘要:

A study was made of the density changes in the thermometer glasses, Corning 0041, 7560, 1720 and an experimental glass, Corning EXP175EK. Thermometers fabricated from these glasses were given similar heat‐treatments in their respective annealing ranges. Measurements were then made of the ice point changes at various fixed temperatures from room temperature to the normal upper useful limits of the glasses. Holding periods extended to 1 year. The ice point change in a thermometer is a measure of the per cent density change in the glass from which the bulb is fabricated. The relation of this change in density to temperature for a given duration of roasting appears to be well represented by two curves of the form of a constant times a temperature to a power. The value of the power appears to change rather abruptly at some temperature,T0, in the neighborhood of 150°C. below the strain point temperature and to be constant in the regions on either side ofT0. At equal temperatures below the strain point the behavior of the glasses is quite simil

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1952.tb13071.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

摘要:

Nickel applied to a sheet steel as a nickel flash endures in the surface through several de‐enamelings and re‐enamelings. The attendant improvement in the enameling behavior of the steel is similarly persistent. Heat‐treating experiments with and without nickel lead to the conclusion that, while the fired ensemble is cooling, nickel oxide at the interface is reduced by hydrogen issuing from the steel, forming water which enters the enamel and diminishing the hydrogen available for defect production. In this function, a cobalt layer is comparatively ineffe

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1952.tb13072.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

摘要:

An apparatus was designed so that an atmosphere (a continuously flowing atmosphere) containing any partial pressure of the active vapor such as H2O, CO2, or SO3, could be maintained around the particles of a mineral powder while the differential thermal analysis was being run. The sample holder and its attendant parts were mounted on a movable vertical shaft so that the assembly could be lowered into or raised out of the furnace. The gas was carried to the powders under very slight pressure through 1/2‐in.‐diameter porcelain tubes, called the injector, which fit snugly into the sample holder cavities. The bottoms of the cavities were the ends of two 4‐hole porcelain tubes which carry the thermocouples and also support the sample holder. Two types of sample holders were used, (1) Inconel tubes, 1/2 in. in outside diameter and 3/4 in. long with a wall thickness of 0.008 in., and (2) a solid Inconel block 3/4 in. in diameter and 3/4 in. long with two symmetrically placed holes 0.234 in. in diameter drilled parallel to the length. These sample holders accommodate about 0.15 gm. of clay or 0.20 gm. of alumina as the reference material. There were four 28‐gauge thermocouple wires in each cavity. In the sample cell, two wires were one leg of the differential couple and the other two wires were dummies to balance the cell. In the reference cavity were the other leg of the differential couple and the measuring couple. All four wires in each cell were fused into a single bead and the wires were spread as far apart as possible, forming a sturdy unit. The furnace was 41/2 in. square and 5 in. long with an Alundum tube core, 11/16 in. in outside diameter, on which 45 ohms of 28‐gauge Nichrome V wire was noninductively wound. A motor‐driven Powerstat was used to control the temperature rate at 16°C

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1952.tb13073.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY