摘要:

ABSTRACTCalcined mixtures of kaolin and alumina were prepared by grinding for different lengths of time and firing the several grinds at different temperatures ranging from slightly above dehydration temperature of clay to 1700°C. The X‐ray diffraction patterns revealed several interesting points relative to the degree of combination of the oxides prese

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13894.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTTests were made of the electrical resistivity of twelve commercially used special refractory brick at temperatures up to 1300°C. Standard 9‐inch brick were tested using apparatus which is standard equipment and readily obtainable. Temperature lag was eliminated by constant heating over a prolonged period of time at given temperatures. Results obtained indicate a decrease in resistivity with prolonged heating for some classes of refractories.Those refractories composed of minerals of the same petrographic classification appear to undergo the least chan

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13895.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTThe failure at elevated temperatures under constant load for silica brick is reported using the Iupuy load test apparatus. The crushing strength at 1500°F, 1800°F. 2100°F, and 2400°F is recorded, as well as the crushing strength at room temperature. The size of test piece utilized normally was 1 by 1 by 2′/2 inches. A definite relationship is shown to exist between the strength at room temperature and that at elevated temperatures. The effect of variation in lime content, bats content, and fluxes is also reported. Data were obtained on brick made from three different quartzites. Additional physical data are reported to give information concerning the properties of the brick t

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13896.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTIn terms of a given apparatus of suitable standard dimensions the plastic flow characteristics of various ceramic slips may be measured and recorded. Each slip has its characteristic plasticity which is a highly important factor in connection with its successful use in the specific process for which it is intended and this plasticity may be adjusted at will in order to obtain the most desirable working condition. The types of flow which have been arrived at through long experience and employed in the art even without a means of measurement arc shown for various commercial enamels, glazes, and body slips. A useful deflocculation test for the classification of clays and the testing of their uniformity from time to time is specified. This description covers a means for control or regulation of the slip whereby (1) uniformity may be obtained in the application of white or colored enamels and glazes, (2) crawling and “settling out” difficulties may be avoided, (3) uniformity of consistency for spray operation from week to week may be checked, (4) accuracy of batch mixing may be checked, (5) casting slip control may be effected, and (6) in general, any other property such as case of filter‐pressing or sieving which depends wholly or partially on a proper slip consistency may be held at the most desirable

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13897.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTVarious underglaze colors obtained from different ceramic color firms were mixed with gum tragacanth and molded into crayons. The preparation and use of the crayons for underglaze designing is discussed, and their advantages and disadvantages are pointed out through experimental results. The results were studied with an aim to using crayons instead of painting the colors on the bisque, as is now generally done. After more experimentation there is a possibility of developing the use of crayons for this purpose.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13898.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTLittle progress has been made in the past to prevent crazing on porous ceramic ware because many of the fundamental causes of this defect were not known. Three sources of crazing are described which have not generally been recognized as causes of this defect. It was found that a type of crazing may be caused by firing ware under a reducing kiln atmosphere. This defect may also be caused by small changes in volume of the body produced by frost action. A special type of crazing may be caused by mechanical pressure on the ware during service. The defects can be prevented by more careful manufacture and selection of raw materials.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13899.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTA study of the reactions between boric acid and typical ceramic raw materials in slips was made to determine the cause of raw glazes thickening upon standing. Raw zinc oxide, precipitated barium carhonate, and light magnesium carbonate were found to react deleteriously with boric acid in milled slips with thickening or “setting” occurring. This thickening does not occur in many instances when large amounts of white lead are present in the mill batch. Remedies are given which were used to overcome this increase in viscosity in commercial raw glazes by using calcined mixtures and insoluble fr

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13900.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY

摘要:

ABSTRACTA method is given for the accurate wet blending of glazes and slips whereby a single characteristic of the suspension called the G value (or grams per cubic centimeter value) is determined and used as the basis for all blends.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1932.tb13901.x

出版商:Blackwell Publishing Ltd    

年代:1932

数据来源: WILEY