ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14253.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractThe severe attack of the refractory checkerwork in a regenerative furnace was encountered at temperatures over 2500°F. Pilot‐plant tests, supplemented by a laboratory investigation, were made of silicate refractories varying in alumina content from 0 to 70%.These tests indicate that the attack was primarily caused by the reduction, to a volatile form, of free and combined silica by carbon. This left a granular residue of mullite and/ or corundum, depending on the original alumina content. Secondary reactions occurred, the most notable of which was the recombination of the corundum with locally deposited silica to form secondary mullite.The laboratory test showed that carbon reacted with mullite at a temperature as low as 2470°F. A petrographic study has shown that the decomposition of the refractory material takes place in well‐defined stages from the initial removal of free silica to the breakdown of mullite. The rate of decomposition increases with temper

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14254.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractA method is given for correlating the chemical composition, relative amounts of glassy bond, and properties of fired ceramic bodies. The procedure consists of (1) plotting the compositions expressed in simplified terms on a reference diagram and (2) plotting data on the physical properties vertically from the plane of the reference diagram. Because the reference diagram contains the appropriate equilibrium diagram, the quantities of liquid and crystalline phases calculated for preparations of pure raw materials heated to equilibrium at a given temperature are useful (1) in estimating the relative quantities of glassy bond in fired bodies and (2) in differentiating fired bodies with respect to phase constituents. Data on fired whiteware are used to illustrate the relation of composition to the following properties: porosity, shrinkage, dielectric strength, and specific gravity.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14255.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractA representative series of colors, blue, brown, green, red, and yellow, was selected for this investigation. Variations of the constituents for these five stains were made and the resulting colors produced in the enamels were measured by means of spectrophotometric curves. The influence of additions of barium oxide, lead oxide, and zinc oxide to the frit was also studied. The addition of lead oxide to the frit tended to give greater solution of the blue stains. The barium oxide additions dissolved the lead antimonate yellow the most, while the lead oxide had the least effect on the yellow stains. Variations in calcination temperatures of the red stains produced decided changes in color. The additions of lead oxide darkened the color produced with the red stains.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14256.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractA study was made relative to the dry pressing of wall tile having a thickness of3/16in. Three bodies, a high talc, a high pyrophyllite, and a regular body were studied. The water content was kept constant and the forming pressures were varied from 1000 to 3000 lb. per sq. in. The bodies were fired to cones 4, 6, and 8. The bisque tile were tested for thermal expansion, warpage, absorption, shrinkage, impact strength, transverse strength, and moisture expansion. The glazed tile were tested for warpage, impact resistance, and moisture expansion.The results showed that satisfactory thin wall tile could be made from all bodies, the high‐pyrophyllite body indicating the greatest promise. It was found that pressing pressures had definite effects on impact strength, warpage, shrinkage, and thermal expansio

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14257.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY