摘要:

AbstractThe extent of coloration is dependent on the amount of lime and alumina and on the thermal history. The coloring agent is usually iron oxide which is present in small amounts. Color is dependent on the grind and on the mixing, drying, and burning procedures. The color can be cleared up or accentuated by controlled laboratory reheating at known temperatures, for definite time intervals. The mottling does not appear unless the brick are well burned. The spots, moreover, have no harmful effect. The literature on this subject is reviewed.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14458.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThe data in this report were obtained during the years of 1923, 1924, and 1925. Among the topics studied were the effects of color in silica brick resulting from the lime, iron oxide, and alumina content of the brick and from varying drying and firing conditions. The effect on color of sulfur gases from coal and the time‐temperature relations are also discussed. The lime‐alumina ratio, the, iron oxide content of the brick, and setting and firing conditions are concluded to be the most significant factors related to the color of the prod

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14459.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThe staining of silica brick was found to occur in a critical temperature range of 900°‘ to 1000°C. Concurrently the brick had to be “soaked“ in this temperature range and exposed to an oxidizing atmosphere. Stained brick could be “cleaned up” or staining prevented by manipulation of the foregoing set of conditions as well as by additions of 4.5% or more of lime. The experimental data examined in the light of the system CaO‐Fe2O3‐SiO2suggest that the colorant is the mineral di

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14460.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractSome tests are described which show that water vapor does not cause softening of silica brick at a temperature of 2900°F in a sixteen‐hour laboratory t

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14461.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractDuring the burning of silica refractories, spots or areas of dark cream to a reddish‐brown color may develop in some of the brick or shapes. This is often called mottling, and its occurrence during the manufacture of the product cannot be definitely controlled. Questions occasionally arise as to whether the colored brick are of as good quality as the uniformly cream‐colored brick. No records are available to show or indicate that color as such has been a cause of shorter life or failure in service. Data are presented that were obtained from testing the mottled and light‐colored brick, and these show that there is no practical difference between them; consequently, color alone should not be a criterion for judging quality.The traces of iron present in the silica used are a necessary constituent in the formation of the color. The light‐colored product, however, contains the same quantity of iron. It is not entirely clear as to how the iron is present in the two types. Unknown conditions during manufacture are such that the traces of iron may be influenced to form either the light or mottled brick, but the process cannot be controlled.A considerable amount of experimental work is presented which shows the nature of the color behavior with comments on certain conditions that cause the color fo

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14462.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractThe unusually great heat absorption of certain sizes of kaolinite particles is described There are indications that kaolinite may be a mixture of two similar minerals, one requiring more energy to drive off combined water.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14463.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractSeveral iron‐bearing tales were fired alone and in body form and were measured for shrinkage and absorption. Their colors were also noted. Electrical measurements of dielectric constant and loss characteristics were made on the bodies and compared with white‐firing tales. The effect of small additions of Fe2O3on a white‐firing talc is also desc

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb14464.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY