摘要:

AbstractThe spinels MgO Al2O3, MgO Cr2O3., and MgO Fe2O3and the orthosilicates 2MgO SiO2, 2CaO SiO2, 2SrO SiO2, and 2BaO SiO2were synthesized by solid‐state reaction of the component oxides or compounds yielding the oxides on ignition. Each of the spinels was tested at various temperatures with each orthosilicate in turn by placing a pellet of each in contact and also by intimately mixing the two. Petrographic microscopy and X‐ray diffraction were employed in the identification of reaction produ

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14891.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractExperiments were conducted to find a simple, adequate means of specifying glaze consistency. Tests showed that the amount of slip clinging to a glass plate after it is withdrawn from a reservoir of slip (known as its coherence value) was directly influenced by such factors as amount of water, clay content, and age. These factors are commonly thought of as governing the working quality of the slip. Surface tension has little apparent relation to the working qualities of the slip. Examination of the fired glazes revealed that a distinct coherence value separated good glazes from poor types. A total of 110 pieces was fired; of these samples, fifty‐two were glazed with slips having coherence values above 0.04 gm. per sq. cm. Only three of the fifty‐two samples were satisfactory; the remaining fifty‐eight were coated with slips with a coherence value of less than 0.04 gm. per sq. cm. Only nine of these were defective in any respect and most of them were in the region of 0.04 gm. per sq. cm. coherence

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14892.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractAn attempt was made to correlate the thickness of deposition of glazes with the air permeabilities of the bodies. The correlation was satisfactory under certain restricted conditions but not for general cases. An adequate correlation was obtained, independent of the type of body, between thickness of glaze deposition, glaze consistency (coherence value), and water receptivity.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14893.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractAdditional types of glazes were studied and improvements in technique and apparatus are described. The correlation between glaze consistency, body receptivity, and thickness of deposition is represented by a simple first‐order equation having two constants,P=K(R/100) (C− 0.001), whereinP= pickup,K= deposition constant,R= receptivity, andC= coherence va

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14894.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY

摘要:

AbstractCoherence‐value and receptivity measurements may be used as (1) a check on incoming raw materials, (2) a basis for selection of certain raw materials, (3) a control test for slip consistency, (4) a control test at various steps in the manufacturing process, and (5) a basis for blending clays and other raw materials. These methods also hold promise of general application in fields other than glaze contro

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1944.tb14895.x

出版商:Blackwell Publishing Ltd    

年代:1944

数据来源: WILEY