ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1930.tb16795.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1930.tb16796.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1930.tb16798.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1930.tb16799.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1930.tb16800.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

摘要:

ABSTRACTSome possible ceramic applications of the Toepler mercury pump as employed in determination of gases in various materials are discussed. The procedure followed in measuring the gases given off by a clay slip at reduced pressures is described. It was found that 4.65% of gases by volume are removed from a sample of clay slip by reducing the pressure on the sample to boiling (25 mm.). An additional 0.18% of gases was cvolved between the boiling pressure and 1.8 mm. at which pressure the sample was dry.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1930.tb16801.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

摘要:

ABSTRACTPhysical defects in the castings, especially “sponginess,” will cause blisters, as will also fanlty composition or application of enamels. There are, however, differences in the tendencies of different sound castings to give blisters when enameled under identical conditions. The gases forming these blisters are CO and CO2.A gray iron casting acquires in freezing and cooling a very thin surface skin, or “microchill,” of varying thickness and hardness. The data indicate that removal of this skin from sound castings eliminates blistering. During the enameling process the combined carbon of this skin tends to break down to a nascent, readily oxidizable form of carbon, which evolves CO and CO2. There are probably two kinds of nonblistering iron, one in which little combined carbon is present at the surface, and another in which it is stabilized. Some irons are more prone to give the “microchilled” layer than others. During the early stages of enameling both blistering and nonblistering irons evolve gas, which is attributed to quick oxidation of submicroscopic graphite and which escapes bcfore the enamel has fused to a retentive condition. Addition of graphitizing agents, such as silicon, may be beneficial, but the microchill is harder to avoid than the ordinary, or macrochill. Removal of the surface layer by deep sandblasting or “burning out” appears to be the most practical remedy for blistering of

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1930.tb16802.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1930.tb16803.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

摘要:

ABSTRACTThe object of the investigation was to develop eutectic solvent for an enamel by the combination of several eutectics, then to add silica to increase the refractoriness of the enamel up to the limit of its capability to dissolve silica without endangering its bond to the metal body. This naturally involved a study of the entectic compositions of the RO–B2O3–SiO2systems. Since the Na2O–B2O3‐SiO2, K2O–B2O3–SiO2, and PbO–B2O3‐SiO2detormation eutectics are known a knowledge of the CaO‐B2O3‐SiO2system was necessary. A study of the high B2O3area of this system was made at approximately 4% intervals. A member high in CaO and SiO2, and which on repeated fusions showed practically 100% glass, was selected as a practical member to blend with the Na2O‐B2O3–SiO3and the PbO‐B2O3–SiO2eutedic to form a eutectic solvent for an enamel.Combinations of these eutectics and the CaO‐B2O3‐SiO2mixture were made and applied to cast iron by the dry process. Additions of SiO2were also made to these enamels up to 1.5 molecular equivalents. The physical properties of these enamels such as brilliancy, smoothness of surface, texture, bonding power, solubility in water, and resistance to a

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1930.tb16804.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY

摘要:

ABSTRACTThis paper shows instances of Iowa tile of variance from general classifications, of maximum absorption limits below which building tile are durable against freezing and thawing. Exception is taken to the A.S.T.M. Specification C34‐27 as to nomenclature and tests by which tile are classifie

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1930.tb16805.x

出版商:Blackwell Publishing Ltd    

年代:1930

数据来源: WILEY