<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0121-1129</journal-id>
<journal-title><![CDATA[Revista Facultad de Ingeniería]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. ing.]]></abbrev-journal-title>
<issn>0121-1129</issn>
<publisher>
<publisher-name><![CDATA[Universidad Pedagógica y Tecnológica de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-11292017000200121</article-id>
<article-id pub-id-type="doi">10.19053/01211129.v26.n45.2017.6421</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Development of o refractory mold based on chamotte/ plaster for jewelry micro-casting with pre-set emeralds]]></article-title>
<article-title xml:lang="es"><![CDATA[Desarrollo de un revestimiento de chamota/ueso poro microfundición de joyería con esmeraldas preengastadas]]></article-title>
<article-title xml:lang="pt"><![CDATA[Desenvolvimento de um revestimento de chamota/gesso para micro fundição de joias com esmeraldas pré-engastadas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Londoño-Montes]]></surname>
<given-names><![CDATA[Carlina Sofía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Torres]]></surname>
<given-names><![CDATA[Mayerly Jhojana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Córdoba-Tuta]]></surname>
<given-names><![CDATA[Elcy María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Industrial de Santander  ]]></institution>
<addr-line><![CDATA[Bucaramanga Santander]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Industrial de Santander  ]]></institution>
<addr-line><![CDATA[Bucaramanga Santander]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Industrial de Santander  ]]></institution>
<addr-line><![CDATA[Bucaramanga Santander]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<volume>26</volume>
<numero>45</numero>
<fpage>121</fpage>
<lpage>135</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-11292017000200121&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-11292017000200121&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-11292017000200121&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract During the jewelry stone-in-place micro-casting process, the ceramic mold, which is composed of silica and plaster is stabilized at temperatures close to 650 °C, whereas the casting temperature of the precious metal alloy hovers around 1000 °C. Therefore, this type of micro-casting technique is not suitable for gems such as emeralds, since they are highly susceptible to damage at temperatures over 350 °C. In the face of this fact, the main purpose of the present work is to develop a refractory mold based on chamotte and plaster, which can be stabilized at low temperatures, in order to use it for the micro-casting of pre-set emeralds. To achieve this, the experimental methodology was divided into three phases: i) raw chemical materials, mineralogical, granulometric and thermal characterization; ii) preparation and characterization of chamotte-plaster-water mixtures, including the measurement of casting times, mechanical and microstructural properties, permeability, and resistance to thermal shock; and iii) evaluation of the resulting refractory mold in the micro-casting of pre-set emeralds. The results showed that the refractory mold with composition chamotte/ plaster 75/25, an addition of 50 % of water to the dried mixture, and fine granulometry (-200 mesh) had a stabilization temperature of 350 °C. Furthermore, it is possible to subject the emeralds to the stone-in-place micro-casting process that employs the refractory mold developed here, with a thermal treatment that does not surpass the 350 °C, along with a low melting point (398 °C) for the precious metal alloy.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Durante el proceso de microfundición de joyería con preengaste de gemas, el molde cerámico compuesto de sílice y yeso se estabiliza a temperaturas cercanas a 650 °C, mientras que la temperatura de vertido de la aleación preciosa ronda los 1000 °C. Por tal motivo, este método no es apropiado para gemas como la esmeralda, dada la gran susceptibilidad de esta al daño cuando se expone a temperaturas superiores a 350 °C. Teniendo en cuenta lo anterior, el objetivo del presente trabajo fue desarrollar un revestimiento cerámico de chamota/yeso que adquiera estabilidad dimensional a bajas temperaturas, con el fin de implementar el método de preengaste de esmeraldas para la obtención de piezas de joyería. La metodología experimental se dividió en tres etapas: i) caracterización química, mineralógica, granulométrica y térmica de las materias primas; ii) preparación y caracterización de las mezclas chamota-yeso-agua, incluyendo tiempos de vertido y fraguado de las pastas, junto a la permeabilidad y resistencia a la compresión y al choque térmico, y además, análisis microestructural, y iii) evaluación del nuevo revestimiento en el proceso de microfundición con preengaste de esmeraldas. Se encontró que las condiciones más adecuadas para obtener el revestimiento chamota/yeso son: granulometría fina del refractario (100 % con pasante malla 200), relación chamota/yeso 75/25 y adición de 50 % de agua a la mezcla seca. Los resultados de la investigación permiten concluir que es posible someter las esmeraldas al proceso de microfundición de joyería, con gemas preengastadas, empleando el revestimiento chamota/yeso desarrollado aquí, cuyo tratamiento térmico no supera los 350 °C, así como una aleación de metal precioso de bajo punto de fusión (398 °C).]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Durante o processo de micro fundição de joias com pré-engaste de gemas, o molde cerâmico composto de sílice e gesso, estabiliza-se a temperaturas próximas a 650 °C, enquanto que a temperatura de vertido da liga lindo ronda os 1000 °C. Por tal motivo, este método não é apropriado para gemas como a esmeralda, dada a grande suscetibilidade desta ao dano quando se expõe a temperaturas superiores a 350 °C. Tendo em conta o anterior, o objetivo do presente trabalho foi desenvolver um revestimento cerâmico de chamota/gesso que adquira estabilidade dimensional a baixas temperaturas, com o fim de implementar o método de pré-engaste de esmeraldas para a obtenção de peças de joalheria. A metodologia experimental dividiu-se em três etapas: i) caracterização química, mineralógica, granulométrica e térmica das matérias primas; ii) preparação e caracterização das misturas chamota-gesso-água, incluindo tempos de vertido e fraguado das pastas, junto à permeabilidade e resistência à compressão e ao choque térmico, e, além disso, análise microestrutural, e iii) avaliação do novo revestimento no processo de micro fundição com pré-engaste de esmeraldas. Encontrou-se que as condições mais adequadas para obter o revestimento chamota/gesso são: granulometria fina do refratário (100 % com passante malha 200), relação chamota/gesso 75/25 e adição de 50 % de água à mistura seca. Os resultados da pesquisa permitem concluir que é possível submeter às esmeraldas ao processo de micro fundição de joias, com gemas pré-engastadas, empregando o revestimento chamota/gesso desenvolvido aqui, cujo tratamento térmico não supera os 350 °C, assim como uma liga de metal lindo de baixo ponto de fusão (398 °C).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Chamotte]]></kwd>
<kwd lng="en"><![CDATA[Emeralds Micro-Casting]]></kwd>
<kwd lng="en"><![CDATA[Plaster]]></kwd>
<kwd lng="en"><![CDATA[Refractory Mold]]></kwd>
<kwd lng="en"><![CDATA[Stone-In-Place]]></kwd>
<kwd lng="es"><![CDATA[Chamota]]></kwd>
<kwd lng="es"><![CDATA[Microfundición]]></kwd>
<kwd lng="es"><![CDATA[Molde refractario]]></kwd>
<kwd lng="es"><![CDATA[Preengaste de esmeraldas]]></kwd>
<kwd lng="es"><![CDATA[Yeso]]></kwd>
<kwd lng="pt"><![CDATA[Chamota]]></kwd>
<kwd lng="pt"><![CDATA[Micro fundição]]></kwd>
<kwd lng="pt"><![CDATA[Molde refratário]]></kwd>
<kwd lng="pt"><![CDATA[Pré-engaste de esmeraldas]]></kwd>
<kwd lng="pt"><![CDATA[Gesso]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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