Features of initial raw materials and pottery paste of ancient ceramics from the Tomsk Ob region

Author(s):  
Nadezhda F. Stepanova ◽  
◽  
Lyudmila M. Pletneva ◽  
Dmitriy Yu. Rybakov
2014 ◽  
Vol 114 ◽  
pp. 59-64 ◽  
Author(s):  
S. De la Vega ◽  
M. Jiménez-Reyes ◽  
D. Tenorio ◽  
A. Castañeda-Gómez-del-Campo ◽  
A. Nieto-Téllez ◽  
...  

2018 ◽  
Vol 143 ◽  
pp. 02001
Author(s):  
Elza Sutakova ◽  
Alexei Mestnikov

The paper investigates possibility of ancient ceramics technology recreation based on materials of archaeological excavations and experimental simulation and describes results of the research. The structure and properties of ceramic samples found during archaeological excavations of the neolithic age and clay raw materials from different deposits were studied. The fragments under study were shown to consist mainly of light-melting clays, possessing polimineral composition with additives of fire clay, sand, loose sedimentary rock, and in some cases wool and vegetation. Clays under study are characterized by variability of chemical and mineral composition, by their combining it is possible to obtain optimal moulding compositions to produce ceramic products of artistic and architectural-structural purpose. Overview of scientific and technical information in archaeology and the obtained experimental results enable to reveal compositions and peculiarities of ancient technology of ceramics production and technical decoration application. Peculiar features of experimental simulation of the ancient ceramics technology considering chemical and mineral composition of clay raw materials are described.


Author(s):  
M. Isabel Prudêncio ◽  
M. Isabel Dias ◽  
M. José Trindade ◽  
M. Amália Sequeira Braga

Clay analysis plays a crucial role in studies of ancient ceramics, contributing with answers to better understanding resource exploitation strategies, production technologies, and regional and interregional interaction patterns. The vessels are made essentially by clays, the composition of the ceramics reflectingthe origin of the clay materials used and conclusions may be inferred concerning the type of raw materials and the establishment of the geographic area of production. Different geochemical patterns found in clays from different geological contexts, consist on an important basis for the comparison with ceramics since the identification of the clays used for productions can contribute to delimit a potential area of clay resources and thus establishing provenance. This is particularly useful when no archaeological evidence of production exists. REE patterns are very important for the characterization of ceramic productions and their relation with raw materials, as subtle variations between them reflect differences in their relative behaviour in response to the chemical environment, making this group particularly useful in geochemistry studies. So, REE are crucial trace elements to pursue studies of raw materials and provenance establishment and trade routes reconstruction in ancient times. As terras raras como indicadores geoquímicos na proveniência de cerâmica antiga - O estudo das argilas assume um papel crucial na investigação de cerâmicas antigas, contribuindo para o esclarecimento e melhor compreensão de estratégias de exploração de recursos de matérias-primas, tecnologias de produção e padrões de interacção regional e inter-regional. Os recipientes cerâmicos são essencialmente constituídos por argilas, reflectindo a sua composição a origem dos materiais argilosos usados, podendo ser retiradas conclusões relativamente ao tipo de matérias-primas, bem como ao estabelecimento de áreas geográficas de produção. Os diversos padrões geoquímicos encontrados nas argilas provenientes de diferentes contextos geológicos, constituem uma importante base para a comparação com as cerâmicas, uma vez que a identificação das argilas usadas em certas produções, pode contribuir para a delimitação da potencial área fonte de argilas, estabelecendo-se assim a sua proveniência. Este facto é particularmente relevante quando não existe evidência arqueológica de produção. Os padrões de terras raras são muito importantes para a caracterização das produções cerâmicas e sua relação com as matérias-primas, uma vez que as variaçõessubtis que apresentam reflectem diferenças no seu comportamento em resposta ao sistema químico que as rodeiam, tornando este grupo particularmente útil em estudos de geoquímica. Deste modo, as terras raras são elementos traço cruciais em estudos de matérias-primas e no estabelecimento de proveniência de cerâmicas, contribuindo para a reconstrução de rotas comerciais em tempos antigos.


Author(s):  
C. J. Chan ◽  
K. R. Venkatachari ◽  
W. M. Kriven ◽  
J. F. Young

Dicalcium silicate (Ca2SiO4) is a major component of Portland cement. It has also been investigated as a potential transformation toughener alternative to zirconia. It has five polymorphs: α, α'H, α'L, β and γ. Of interest is the β-to-γ transformation on cooling at about 490°C. This transformation, accompanied by a 12% volume increase and a 4.6° unit cell shape change, is analogous to the tetragonal-to-monoclinic transformation in zirconia. Due to the processing methods used, previous studies into the particle size effect were limited by a wide range of particle size distribution. In an attempt to obtain a more uniform size, a fast quench rate involving a laser-melting/roller-quenching technique was investigated.The laser-melting/roller-quenching experiment used precompacted bars of stoichiometric γ-Ca2SiO4 powder, which were synthesized from AR grade CaCO3 and SiO2xH2O. The raw materials were mixed by conventional ceramic processing techniques, and sintered at 1450°C. The dusted γ-Ca2SiO4 powder was uniaxially pressed into 0.4 cm x 0.4 cm x 4 cm bars under 34 MPa and cold isostatically pressed under 172 MPa. The γ-Ca2SiO4 bars were melted by a 10 KW-CO2 laser.


Author(s):  
Chung-kook Lee ◽  
Yolande Berta ◽  
Robert F. Speyer

Barium hexaferrite (BaFe12O19) is a promising candidate for high density magnetic recording media due to its superior magnetic properties. For particulate recording media, nano-sized single crystalline powders with a narrow size distribution are a primary application requirement. The glass-crystallization method is preferred because of the controllability of crystallization kinetics, hence, particle size and size distribution. A disadvantage of this method is the need to melt raw materials at high temperatures with non-reactive crucibles, e.g. platinum. However, in this work, we have shown that crystal growth of barium hexaferrite occurred during low temperature heat treatment of raw batches.


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