摘要:

AbstractThe properties of ware, which were given different thermal treatments, have been compared. The tests include shrinkage, flexural strength, elasticity, thermal expansion, moisture expansion, microstructure, glaze stress, and glaze microhardness. The variations in these properties occurred as a result of differences in (1) supposedly similar firings, (2) the uniformity of the kiln from end to end, (3) the same firing in the cross section of the kiln caused by uneven heat distribution, (4) the rates of firing to the same cone deformation, and (5) repeated firings.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb16036.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractThe properties of semivitreous bodies and ware, which were given different thermal treatments, are compared. The tests include flexural strength, shrinkage, absorption, elasticity, moisture, and thermal expansion. The resistance to crazing vs. the bisque thermal history is correlated with (1) the moisture and thermal expansion of the two bodies studied, (2) actual crazing tests on ware made from these bodies, and (3) glaze fit tests. The variation in glaze texture, hardness, and stress condition for different glostfiring treatment was studied.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb16037.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractThe relations between the firing treatment and physical properties of some commercial, antimony‐bearing dry‐process enamels for cast iron were studied. These properties include opacity and resistance to surface abrasion for both acid‐resistant and regular enamels and acid resistance of the acid‐resistant types. In contrast to wetprocess enamels for sheet steel, these dry‐process enamels were found to be little affected by the extreme variations in firing which might be encountered in ordinary

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb16038.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractThe operation in enameling that is the most difficult to control is the setting up of enamels for dipping. The difficulty occurs because there has been no practical accurate method for measuring the set of the enamel. Practical experience shows that viscosity is not an indication of the set or of the dipping weight. The method presented consists in determining the apparent specific gravity of the enamel slip with true value for the specific gravity. Calculations give a numerical value for the value of the set or yield point. The measurements are accurately reproducible, and dipping weights have been found to correlate quite well with the results given of tests in laboratory and plants.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb16039.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractThe users of bottles often saythat old bottles are stronger than new nnes. This is untrue because (1) any greater breakage on the Grst filling can be attributed to abnormally weak bottles or bottles cracked during shipment; the survivors may give less breakage on the second and third fillings, but the strength of the individual bottle has not actually increased; and (2) the statement is based on the faulty assumption that bottles are not weakened by use.Experimental tests on fruit jars in the absence of use do not show a decrease in the thermal‐shock strength after seven years of aging plus three years of weathering by temperature changes, rain, snow, and sunshine. Neither does weathering for three years nor solarization in the direct rays of the July and August sun produce any decrease in the internal pressure strength of bottles. Mechanical strength tests, fracture diagnoses, and statistical surveys of the performance of bottles in service, however, show that the strength of glass containers deteriorates because of mechanical wear, use, and abus

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb16040.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY

摘要:

AbstractLaboratory methods of mixing, sampling, and analyzing batches are discussed. The idea of segregation of particles by continued mixing is shown to be fallacious. The use of powdered materials to improve the rate and thoroughness of mixing is recommended.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1942.tb16041.x

出版商:Blackwell Publishing Ltd    

年代:1942

数据来源: WILEY