ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1931.tb17076.x

出版商:Blackwell Publishing Ltd    

年代:1931

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1931.tb17077.x

出版商:Blackwell Publishing Ltd    

年代:1931

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1931.tb17079.x

出版商:Blackwell Publishing Ltd    

年代:1931

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1931.tb17080.x

出版商:Blackwell Publishing Ltd    

年代:1931

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1931.tb17081.x

出版商:Blackwell Publishing Ltd    

年代:1931

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1931.tb17082.x

出版商:Blackwell Publishing Ltd    

年代:1931

数据来源: WILEY

摘要:

ABSTRACTNineteen soda‐lime glasses covering the commercial field were prepared, melted, and fined for 2 hours. The chemical composition of the raw materials was determined by usual analytical methods; the refractive index was determined by an Abbé refractometer; density, by the normal suspension method; and softening point, by the Littleton method with the furnace as specified inJour. Amer. Ceram. Soc.,10[4], 259‐63 (1927).The data indicate the following points: (1) When the silica was kept constant by increasing the dolomitic lime at the expense of soda an increase in softening point of 11 to 12°C per 1% increase was obtained. Likewise the density increases 0.004 and the refractive index 0.0015 per 1% increase of lime. (2) When the soda was kept constant the softening point was practically constant. The density decreases 0.011 and the refractive index 0.0030 per 1% increase of silica at the expense of lime. (3) When the lime was kept constant the increase in softening point per 1% increase in silica varied as follows : 5% lime 21°C, 8% lime 17°C, 10% lime 15°C, and 12% lime 12°C. The density decreased 0.008 and the refractive index 0.0015 per 1% increase in silica at the expense of soda. (4) A thermo‐chemical relation of the softening points and the chemical compositions (calculated) closely paralleling the “liquidus” surfaces of Feild and Roysters' system

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1931.tb17083.x

出版商:Blackwell Publishing Ltd    

年代:1931

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1931.tb17084.x

出版商:Blackwell Publishing Ltd    

年代:1931

数据来源: WILEY

摘要:

ABSTRACTThe history and purpose of the investigation are outlined and reports are made on (1) fineness determinations, chemical analyses, softening range, softening points, “true” specific gravity, thermal expansion, and petrographic analyses of the individual feldspars; (2) the results of porosity, volume shrinkage during firing, color and translucency, mechanical strength, petrographic analyses, effect of feldspar used on relative “glaze fit,” thermal expansion, and elasticity determinations on vitreous and semivitreous bodies in which feldspar is the only variable co

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1931.tb17085.x

出版商:Blackwell Publishing Ltd    

年代:1931

数据来源: WILEY

摘要:

ABSTRACTThe addition of an acid to a clay suspension usually causes rapid sedimentation, while the addition of a base reverses the process. This is generally explained by saying that clay is a negative colloid and hence flocculated or precipitated by the hydrogen ions of the acid and for the same reason deflocculated by the base. These experiments showed that the effect of hydrogen‐ion concentration upon the rate of sedimentation2was relatively great and explains why changes in thephvalues produce such noticeable changes in plasticity and viscogity They show also that elutriation is an uncertain process withoutphcontro

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1931.tb17086.x

出版商:Blackwell Publishing Ltd    

年代:1931

数据来源: WILEY