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1. |
PARTICLE SHAPE AND DIFFERENTIAL SHRINKAGE OF STEATITE TALC BODIES* |
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Journal of the American Ceramic Society,
Volume 27,
Issue 11,
1944,
Page 317-320
Richard S. Lamar,
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摘要:
AbstractAn attempt has been made to correlate the differential shrinkage of fired steatite pieces with the particle shape of the raw talc used in their manufacture. Various talcs of widely varying particle shape were used in making the steatite test pieces. It was found that the more irregular in shape the talc particles, the greater the differential shrinkage.A method is given for assigning arithmetical values to various particle shapes depending on their deviation from sphericity, this arithmetical value being known as specific shape factor. A direct relationship was found to exist between the differential shrinkage of a talc and its specific shape factor. As the talc particles became more irregular in shape, the “specific shape factor” value increased and the differential shrinkage was found to increase. The proper selection of the talc td be used and blends of various talcs were found to be helpful in the control of differential shrink
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1944.tb14476.x
出版商:Blackwell Publishing Ltd
年代:1944
数据来源: WILEY
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2. |
PARTICLE‐SIZE DISTRIBUTION OF STEATITE TALC* |
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Journal of the American Ceramic Society,
Volume 27,
Issue 11,
1944,
Page 320-323
J. S. White,
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PDF (295KB)
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摘要:
AbstractExperiments were made to determine which degree of fineness of ground talc would be most suitable for steatite‐type ceramics. A laboratory‐type air separator, Andreasen pipette, and the Casagrande hydrometer methods were used to measure the particle‐size distribution of commercial steatite talcs.The results indicate that, although wide variations in the particle‐size distribution of steatite talcs have a bearing on the firing shrinkage when the talc is incorporated in a body, the differences in grinding obtained in commercial talcs are not of great importance when proper milling practice is e
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1944.tb14477.x
出版商:Blackwell Publishing Ltd
年代:1944
数据来源: WILEY
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3. |
EFFECT OF ADDITIONS OF DIOPSIDE ON PROPERTIES OF WALL‐TILE BODY* |
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Journal of the American Ceramic Society,
Volume 27,
Issue 11,
1944,
Page 324-326
C. R. Amberg,
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摘要:
AbstractDiopside was substituted for both talc and feldspar in a typical wall‐tile body. It was found to lower the fusion temperature and to lower thermal expansion when compared with talc and to raise thermal expansion when compared with feldspar. Its effects on firing shrinkage, fired absorption, and moisture expansion were somewhat similar to those of tal
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1944.tb14478.x
出版商:Blackwell Publishing Ltd
年代:1944
数据来源: WILEY
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4. |
FUSION EXPERIMENTS IN SYSTEM MgO‐FeO‐Cr2O3‐Al2O3* |
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Journal of the American Ceramic Society,
Volume 27,
Issue 11,
1944,
Page 327-329
Henry N. Baumann,
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摘要:
AbstractVarious methods have been suggested and tried for modifying chrome ores for refractory use. Chrome ores vary widely in chemical composition but are made up chiefly of MgO, Al2O3, FeO, and Cr2O3combined as a member of an isomorphous spinel‐type series. The problem of modifying chrome refractories by chemical and thermal treatment therefore involves a knowledge of the system MgO‐FeO‐Cr2O3‐Al2O3. The present study is based on experiments in which two series of chromium oxide‐alumina fusions containing 10% and 30% Cr2O3, respectively, were fused in an electric‐arc furnace with MgO up to 5% and with FeO up to 5%. The determination of the effect of silica and titania on the primary crystallization of these fusions, as indicated by a petrographic method of examination, was the chief purpose o
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1944.tb14479.x
出版商:Blackwell Publishing Ltd
年代:1944
数据来源: WILEY
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5. |
GLASSHOUSE STONES* |
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Journal of the American Ceramic Society,
Volume 27,
Issue 11,
1944,
Page 330-350
William L. Fabianic,
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摘要:
AbstractMost of the various types of glass stones actually found under operating conditions in furnaces melting soda‐lime bottle glass are discussed. Each type is described in detail and photomicrographs of each kind of stone are shown. The possible source of each type of stone is considered along with general methods for its identification and elimination. Auxiliary aids to the petrographer, such as the use of solvent acids and chemical analyses, are mentioned. The stone specimens have been taken from flint, amber, and green‐colored glas
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1944.tb14480.x
出版商:Blackwell Publishing Ltd
年代:1944
数据来源: WILEY
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6. |
MECHANICS OF ENAMEL ADHERENCE: XVI, INFLUENCE OF MANGANESE DIOXIDE ON METAL PRECIPITATION AT GROUND COAT‐IRON INTERFACE* |
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Journal of the American Ceramic Society,
Volume 27,
Issue 11,
1944,
Page 350-351
R. M. King,
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摘要:
AbstractThe influence of manganese oxide alone and in combination with cobalt and nickel oxides on metal precipitation in ground coats has been studied. The previously developed electrical‐resistance method was used. Manganese dioxide present alone was not effective in precipitating metal. The results on the indirect influence of manganese dioxide in combination with cobalt and nickel oxides are not significan
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1944.tb14481.x
出版商:Blackwell Publishing Ltd
年代:1944
数据来源: WILEY
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7. |
OBSERVATIONS INDICATING ABSENCE OF PLASTIC FLOW IN GLASS COATING ON STEEL* |
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Journal of the American Ceramic Society,
Volume 27,
Issue 11,
1944,
Page 352-354
W. G. Martin,
F. W. Lauck,
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PDF (305KB)
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摘要:
AbstractSteel rings were glass coated, and some were split at one point immediately and others one or two years later. Identical movement of the rings caused by compressive forces in the glass indicated that no plastic flow takes place in the glass. The compressive forces were calculated and found to be of the general order of 10,000 Ib. per sq. in. The method of calculation is described.VI. Summary(1) Equal contraction of glass‐coated steel rings cut immediately after firing and those cut one and two years later indicates no plastic flow of the glass coating.(2) Calculations indicate a compressive stress of 10,900 lb. per sq. in. in the glass coating.(3) No definite explanation is advanced for the absence of plastic flow under such stress values except the suggestion that the cross‐section dimensions of the glass and relatively large surface area may account for restraining for
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1944.tb14482.x
出版商:Blackwell Publishing Ltd
年代:1944
数据来源: WILEY
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