摘要:

ABSTRACTAn approximate theory of the thermal conductivity of porous materials is given. The effect of pore size and shape is discussed.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19340.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTAn‘apparatus is described for measuring the thermal conductivity of refractories at temperatures up to about 2000°F. The theory and method of test are discussed in detail and results are given on a light refractory insulating brick and also on a silica fire brick and dense clay fire bri

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19341.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTInsulating materials of various types are discussed and their installation in air heaters, carbottom, walking‐beam bright annealing, standard, bell‐type, and wire patenting furnaces, and glass leers is described. Data on the savings involved in the use of insulating refractories are given. The characteristics of the materials are uniformity of product, shrinkage and spalling properties, physical strength, insulating value, and thermal capac

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19342.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTAn investigation of eleven types of insulating brick was made. Physical properties determined included bulk density, porosity, transverse and crushing strength, pyrometric cone equivalent, volume shrinkage at 2300°F, 2500°F, and 2700°F, load deformation at elevated temperatures, and resistance to spalling. A study of the relation between permeability and pressure differential through the various insulating brick is included in the report.Suggestions for classifying the various types of insulating brick into groups and a critical discussion of formulas for permeability are also giv

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19343.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTA comparison is made of the results of particle‐size determinations by screening, elutriation, and microscopic count. Particular stress is laid on those sizes under 325‐mesh (44 microns). The results obtained indicate that the microscope offers a quick practical method of sufficient accuracy to warrant its use in such w

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19344.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTA study of the particle‐size distribution in batch and continuous ground commercial flints and feldspars is discussed. A size‐frequency law for batch‐ground materials is proposed. The use of similar investigations in systematic modification of continuous grinding procedure is indi

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19345.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTSolid pieces of electrically fused material, varying in composition from 630%, alumina 37%, silica to 100% alumina, of the ordinary abrasive grade were heated in contact with cast iron and brass which were allowed to oxidize and attack the refractory. The least attack was found in the case of the iron with 80% alumina 20% silica, and in the case of the brass with straight alumina, although the 80% alumina 20% silica was not greatly inferior.Bonds were developed for the materials thus selected and confirmatory tests were made on crucible fusions. Arc and powdered‐coal furnaces lined with the bonded materials have proved successfu

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19346.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTA study was made of the reactions occurring in adherence when firing ground coats containing no adherence‐promoting oxides. Enamel coatings were fired on trial pieces of steel through three stages or zones and the results of each firing were noted. It was found that in laboratory tests, enamels which do not contain cobalt and nickel oxides have good adhering qualities if they are correctly fired. Iron oxide increases the refractive index of the ename

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19347.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTThe authors present data on their tests on the expansion coefficient of enamels to sheet steel and give results on their tests for cover enamels, upper and lower ground coats, and sheet steel. They find that the expansion coefficient, 0° to softening temperature, of the fired ground coat is only a little less in the region of the steel surface than the steel itself, and that it decreases within the ground coat toward the cover coat in order to approach the lower coefficient of the ground coat. They state that all previous measurements of the coefficients of sheet‐steel ground coats are not efficient. This study is being continu

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19348.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY

摘要:

ABSTRACTIn general, cover‐coat slips for sheet iron are milled to give a residue of from 4 to 9% on a 200‐mesh sieve. The opinion was formed that finer milling results in tearing because of results secured on the box‐type rather than the continuous furnace. However, cover‐coat slips milled from 12 to 0.2% on a 325‐mesh sieve are now in use in production on continuous furnaces with no increase in tearing over coarse grinding and with the following advantages: (1) higher opacity, (2) less wear on spray guns, (3) smoother finishes, (4) preferred by sprayers, (5) better suspension, and (6) lower firing tem

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1935.tb19349.x

出版商:Blackwell Publishing Ltd    

年代:1935

数据来源: WILEY