ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14264.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractIt is a recognized fact that dolomite is a valuable addition as an auxiliary flux in white ware bodies, and an excellent glaze ingredient providing another RO member which imparts low thermal expansion to the glaze. There is evidence that the addition of dolomite to sanitary‐ware bodies has resulted in the lowering of the firing temperature without daunting or other ill effects.The present investigation involved a study of the use of dolomite in floor‐tile bodies. A review of the literature showed that little or no work has been done in this field, and it was, therefore, necessary to follow somewhat closely investigations carried on in the vitreous sanitary ware and dinnerware fields to determine the optimum percentages of dolomite to be incorporated in the test batches. A typical floor‐tile composition was taken as standard and dolomite was substituted in increasing amounts at the expense of the accepted flux.The purpose of this investigation is to ascertain if economies could be effected in lowering the firing temperature of the body by the addition of small amounts of a less costly consti

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14265.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractSoft‐mud brick were made from various mixtures of Hudson River clay and grog prepared by calcining the clay at 500°, 700°, and 900°C., and rate of drying tests were carried out. The brick were fired to cones 012, 08, and 04, and a special fast fire to cone 08 was also run. The various properties were compared with those of regular mix brick and all‐clay brick. Brick made of a mixture of clay with 35% of 900°C. grog had particularly satisfactory properties such as to afford definite advantages as regards faster drying and accelerated

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14266.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractIt was found that the wearing qualities of mill balls and mill‐brick linings may be governed to a large extent by deairing and compressed‐air treatments. It appears that the auger destroys some of the benefits gained by deairing, while the piston‐extrusion machine retains many of these benefits. Deairing the freshly pressed mill balls was found to be beneficial if the blanks were extruded from a deairing machine, but was found to be harmful if the blanks were extruded without deairing.On the other hand, subjecting the mill balls which have been deaired after forming to a compressed‐air treatment improved the mill balls made of blanks extruded without deairing, but proved to be somewhat harmful to mill balls made of blanks extruded from a deairing

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14267.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractA study was made of specific surface, particle‐size distribution, and particle shape of several talcs from the Death Valley area of California and the effect of these factors upon the action of the tale in a casting and dry‐press body.Talcs of low‐specific surface were found to produce slips of greater fluidity and higher density with less water than tales of high‐specific surface. Talcs of low‐specific surface were found to produce dry‐press bodies which had less tendency to laminate than tales of high‐spe

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14268.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY

摘要:

AbstractA method of preparing transparent replicas of ceramic surfaces for study with the optical microscope is described. Photomicrographs and projection prints of surface details which are difficult to analyze microscopically by direct methods of observation are presented. The surface‐replica material used will penetrate openings as small as the limit of resolving power of the ordinary light microscope and can be studied effectively by (1) direct observation by transmitted light in a microscope having the simplest available optical system, (2) used as a transparency and projected on a screen, and (3) placed in a photographic enlarger and used as a negative to produce direct projection photographic prints. The method is particularly useful when duplicate samples of the same specimen are required, when the specimen cannot be destroyed by grinding or cutting, or when reflected light from a surface destroys contrast in detai

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1948.tb14269.x

出版商:Blackwell Publishing Ltd    

年代:1948

数据来源: WILEY