摘要:

ABSTRACTAttention is drawn to the fact that different brands of sodium silicate vary 250 % in their soda to silica ratio. Four silicates with ratios from 1:1.8 to 1:4 were added on a basis of per cent Na2O to slips of six clays commonly used in the whiteware industry. Rate of flow, hydrogen‐ion concentration, and settling behavior were studied. Maximum rate of flow was produced in each case while the slip was acid. Those silicates high in silica were the most potent in their effect on rate of flow for a given amount of Na2O. The effect was also more pronounced than that of NaOH, Na2CO3, or silica sol which were used as comparisons. Possible explanations of the mechanism of deflocculation are discussed to explain the result

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1927.tb09665.x

出版商:Blackwell Publishing Ltd    

年代:1927

数据来源: WILEY

摘要:

ABSTRACTOn addition of acids and bases to fine‐ground feldspar or flint, the same phenomena are observed as with clays, Le., flocculation, deflocculation, and absorption. The effects are less sharp than with clays, the zone of deflocculation covering a wider range of PH and flocculation occurring at lowerpH (greater acidity). The sensitiveness of flint and feldspar to reagents increases with fineness of grindin

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1927.tb09666.x

出版商:Blackwell Publishing Ltd    

年代:1927

数据来源: WILEY

摘要:

ABSTRACTMany technical, as well as nontechnical, men hesitate to use hydrogen‐ion control because they feel that its application requires the services of a highly trained chemist. This paper shows, by a simple nontechnical discussion of the subject and by a demonstration of the method of making measurements, that a plant foreman can apply it just as easily and accurately as a trained chemis

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1927.tb09667.x

出版商:Blackwell Publishing Ltd    

年代:1927

数据来源: WILEY

摘要:

ABSTRACTFor the purpose of measurement the softening point of glasses is defined as that temperature at which a uniform thread of glass .65 mm to 1 mm in diameter suspended in a vertical position in an electric furnace of specified characteristic will elongate at the rate of 1 mm per minute. The measurements on a given glass are reproducible to within 1 to 2°C. This method has been found useful as control of glass composition in melting units as well as a point of reference to distinguish between different glasses. Data are given showing the variation in softening point of a tank glass and a pot glass over an interval of time

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1927.tb09668.x

出版商:Blackwell Publishing Ltd    

年代:1927

数据来源: WILEY

摘要:

ABSTRACTThe results of particle size analyses of a number of commercial feldspars and flints by the sedimentation method are reported. A comparison of batch and continuous grinding is given as well as a study of the progress of ball mill grinding.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1927.tb09669.x

出版商:Blackwell Publishing Ltd    

年代:1927

数据来源: WILEY

摘要:

ABSTRACTA very fusible glaze containing rutile was fired at cones varying from 010 to 03. The fusibility was adjusted by introducing feldspar, and various colorants were added to control the color. The results were very interesting and varied—especially for a modeled or incised patter

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1927.tb09670.x

出版商:Blackwell Publishing Ltd    

年代:1927

数据来源: WILEY

摘要:

ABSTRACTVariations were made from 5 to 25 % in soda oxide and boric oxide content of a given ground coat enamel, and results observed on trial pieces. It was found that an increase of soda oxide at the expense of boric oxide decreased the tendency of the enamels to blister and fishscale, and increased the tendency toward the formation of copperheads. Conversely, the increase of boric oxide at the expense of soda oxide increased the tendency of the enamels to blister and fishscale, but decreased the tendency to copperhead.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1927.tb09671.x

出版商:Blackwell Publishing Ltd    

年代:1927

数据来源: WILEY

摘要:

ABSTRACTTroubles in working with enamels may be caused by poor workmanship in some department or by changes in composition of the enamel due to differences in chemical composition of raw materials used. The application of Staley's refractory ratio in determining the agreement of ground coat and enamel cover coat is illustrated.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1927.tb09672.x

出版商:Blackwell Publishing Ltd    

年代:1927

数据来源: WILEY

摘要:

ABSTRACTThe economy of long service from solid cast molds is gradually offset by the loss due to excess thickness of the cast piece. An example of this is discussed, substantiated with figures.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1927.tb09673.x

出版商:Blackwell Publishing Ltd    

年代:1927

数据来源: WILEY

摘要:

ABSTRACTThe variable nature of the raw materials and the intricate methods involved in manufacture make it difficult to secure uniformity in ceramic ware. The elimination of variable factors is helped by adherence to the following rules: (1) Careful analysis of each operation. (2) Development of written standards for each operation, describing the methods and conditions found best. (3) Enforcement of the standards by careful inspection, using accurate tests after each operation to measure the results just obtained. (4) Division of the body as it is made, into homogeneous units or batches, which remain separate through the rest of the production operations. (5) Complete records readily available covering each step through which a batch passes in production. (6) Strict adherence to standard procedure even though tempted by expediency to somewhat let down the bars. The application of the above principles to body‐making at the Champion Porcelain Company is describe

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1927.tb09674.x

出版商:Blackwell Publishing Ltd    

年代:1927

数据来源: WILEY