<?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>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2007000500010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Concepción y preparación de un recubrimiento protector en forma de película compósito a base de carburo de titanio]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montes de Oca]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galaviz]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-García]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[LePetitcorps]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Manaud]]></surname>
<given-names><![CDATA[J.P.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,IPN Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Unidad Altamira]]></institution>
<addr-line><![CDATA[Altamira Tamps.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,IPN ESIQIE Depto. Ing Metalúrgica]]></institution>
<addr-line><![CDATA[México DF]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Université BordeauxI 87 ICMCB-CNRS ]]></institution>
<addr-line><![CDATA[Pessac-Cedex ]]></addr-line>
<country>France</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2007</year>
</pub-date>
<volume>53</volume>
<numero>5</numero>
<fpage>386</fpage>
<lpage>395</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2007000500010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2007000500010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2007000500010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los nitruros y carburos de metales de transición (p.e. Ti, V, Hf, etc.) son ampliamente conocidos como materiales refractarios debido a su alto punto de fusión, elevada dureza y elevado modulo de Young. Sin embargo, su fragilidad induce una baja resistencia a la fisuración, sobre todo cuando estos materiales se depositan sobre sustratos con un coeficiente de dilatacion térmica muy diferente. En el campo de materiales, diversas técnicas de depósito han sido utilizadas para la síntesis de recubrimientos de nitruro y carburo de titanio. Con el propósito de elaborar un recubrimiento duro, refractario e impermeable para proteger un componente metálico de tungsteno expuesto a un metal líquido agresivo, en este estudio se reporta la concepcion y la preparación de recubrimientos de TiC a 1000°C por CVD, y recubrimientos a base de TiC y de tipo composito Ti1-xWx/TiCx por evaporación reactiva asistida por plasma a 250 y 500°C, respectivamente. El efecto de diferentes parámetros experimentales fue correlacionado con la estructura cristalina, textura, morfología y composición química de los depósitos. La microestructura, el tamaño del cristal y la morfología de las películas se estudió por medio de difracción de rayos X (DRX), y microscopía electronica de barrido (MEB). La composición química fue determinada por espectroscopia de electrones Auger (EEA) y microsonda de rayos X (EPMA, por sus siglas en inglés). Finalmente, la resistencia a la fisuración fue evaluada después de un tratamiento térmico a 1000°C para el caso de recubrimientos elaborados por evaporación reactiva asistida por plasma.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Transition metal nitrides and carbides have widely been used as refractory materials due to their high melting point, high hardness and high Young's modulus. However, its fragility induces a low cracking resistance, mainly when these materials are deposited on substrates with a very different thermal expansion coefficient. Several techniques have been widely used for depositing nitride and titanium carbide coatings. In order to obtain a hard refractory coating for protecting a tungsten device exposed to an aggressive liquid metal, in this study we report the design and synthesis of TiC coatings obtained by CVD at 1000°C, and TiC-based coatings and Ti1-xWx/TiCx composite films obtained by activated reactive evaporation process (ARE) at 250 and 500° C respectively. The effect of different experimental parameters was correlated with crystalline structure, texture, morphology and chemical composition of the deposits. The microstructure, crystal size and morphology of the films were evaluated by x-ray diffraction (XRD) technique and scanning electron microscopy (SEM) respectively. The chemical composition of the films was evaluated by Auger electron spectroscopy (AES) and electron probe microanalysis (EPMA). Finally, cracking behavior of the films prepared by the ARE technique was evaluated by a heat treatment at 1000 °C during 30 min in an He atmosphere.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Películas composito]]></kwd>
<kwd lng="en"><![CDATA[TiC]]></kwd>
<kwd lng="es"><![CDATA[recubrimientos protectores]]></kwd>
<kwd lng="es"><![CDATA[fisuración]]></kwd>
<kwd lng="en"><![CDATA[Composite films]]></kwd>
<kwd lng="en"><![CDATA[TiC-based coatings]]></kwd>
<kwd lng="en"><![CDATA[protecting coatings]]></kwd>
<kwd lng="en"><![CDATA[cracking behavior]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Concepci&oacute;n y preparaci&oacute;n de un recubrimiento protector en forma de pel&iacute;cula comp&oacute;sito a base de carburo de titanio</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>J.A. Montes de Oca&ordf;, J.A. Galaviz&ordf;, J.R. Vargas-Garc&iacute;a<sup> b</sup>, Y. LePetitcorps and J.P. Manaud <sup>c</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>&ordf; Centro de Investigaci&oacute;n en Ciencia Aplicada y Tecnolog&iacute;a Avanzada, Unidad Altamira del IPN, Km. 14.5 Carret. Tampico-Puerto Industrial Altamira, 89600 Altamira, Tamps. M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup></i> <i>Depto. Ing Metal&uacute;rgica, ESIQIE-IPN, UPALM Unidad Zacatenco, Av.IPN S/N, Col Lindavista, 07738 M&eacute;xico DF.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>c </sup></i><i>ICMCB-CNRS, Universit&eacute; BordeauxI 87, Av. du Dr. Schweitzer 33608 Pessac-Cedex, France.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 25 de mayo de 2007     <br> Aceptado el 10 de julio de 2007</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Los nitruros y carburos de metales de transici&oacute;n (p.e. Ti, V, Hf, etc.) son ampliamente conocidos como materiales refractarios debido a su alto punto de fusi&oacute;n, elevada dureza y elevado modulo de Young. Sin embargo, su fragilidad induce una baja resistencia a la fisuraci&oacute;n, sobre todo cuando estos materiales se depositan sobre sustratos con un coeficiente de dilatacion t&eacute;rmica muy diferente. En el campo de materiales, diversas t&eacute;cnicas de dep&oacute;sito han sido utilizadas para la s&iacute;ntesis de recubrimientos de nitruro y carburo de titanio. Con el prop&oacute;sito de elaborar un recubrimiento duro, refractario e impermeable para proteger un componente met&aacute;lico de tungsteno expuesto a un metal l&iacute;quido agresivo, en este estudio se reporta la concepcion y la preparaci&oacute;n de recubrimientos de TiC a 1000&deg;C por CVD, y recubrimientos a base de TiC y de tipo composito Ti<sub>1</sub>-<i><sub>x</sub></i>W<i><sub>x</sub></i>/TiC<i><sub>x</sub> </i>por evaporaci&oacute;n reactiva asistida por plasma a 250 y 500&deg;C, respectivamente. El efecto de diferentes par&aacute;metros experimentales fue correlacionado con la estructura cristalina, textura, morfolog&iacute;a y composici&oacute;n qu&iacute;mica de los dep&oacute;sitos. La microestructura, el tama&ntilde;o del cristal y la morfolog&iacute;a de las pel&iacute;culas se estudi&oacute; por medio de difracci&oacute;n de rayos X (DRX), y microscop&iacute;a electronica de barrido (MEB). La composici&oacute;n qu&iacute;mica fue determinada por espectroscopia de electrones Auger (EEA) y microsonda de rayos X (EPMA, por sus siglas en ingl&eacute;s). Finalmente, la resistencia a la fisuraci&oacute;n fue evaluada despu&eacute;s de un tratamiento t&eacute;rmico a 1000&deg;C para el caso de recubrimientos elaborados por evaporaci&oacute;n reactiva asistida por plasma.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Pel&iacute;culas composito; TiC; recubrimientos protectores; fisuraci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">Transition metal nitrides and carbides have widely been used as refractory materials due to their high melting point, high hardness and high Young's modulus. However, its fragility induces a low cracking resistance, mainly when these materials are deposited on substrates with a very different thermal expansion coefficient. Several techniques have been widely used for depositing nitride and titanium carbide coatings. In order to obtain a hard refractory coating for protecting a tungsten device exposed to an aggressive liquid metal, in this study we report the design and synthesis of TiC coatings obtained by CVD at 1000&deg;C, and TiC-based coatings and Ti<sub>1</sub>-<i><sub>x</sub></i>W<i><sub>x</sub></i>/TiC<i><sub>x</sub></i> composite films obtained by activated reactive evaporation process (ARE) at 250 and 500&deg; C respectively. The effect of different experimental parameters was correlated with crystalline structure, texture, morphology and chemical composition of the deposits. The microstructure, crystal size and morphology of the films were evaluated by x-ray diffraction (XRD) technique and scanning electron microscopy (SEM) respectively. The chemical composition of the films was evaluated by Auger electron spectroscopy (AES) and electron probe microanalysis (EPMA). Finally, cracking behavior of the films prepared by the ARE technique was evaluated by a heat treatment at 1000 &deg;C during 30 min in an He atmosphere.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Composite films; TiC-based coatings; protecting coatings; cracking behavior.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 52.77.Fv; 61.10.Nz; 68.35.Dv; 81.15.Gn</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v53n5/v53n5a10.pdf">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">Este trabajo fue apoyado por el Consejo Nacional de Ciencia y Tecnolog&iacute;a (CONACYT), el Consejo Tamaulipeco de Ciencia y Tecnolog&iacute;a (COTACYT) y la Secretar&iacute;a de Investigaci&oacute;n y Posgrado del Instituto Polit&eacute;cnico Nacional (SIP-IPN). Los autores agradecen a E. Sellier y G. Chollon (MEB) y M. Lahaye (EPMA y EEA) por su apoyo para la caracterizaci&oacute;n de las pel&iacute;culas.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. D.-J. Kim <i>et al., Surf. Coat. Technol. </i><b>116-119 </b>(1999) 906.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8334153&pid=S0035-001X200700050001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2. H.O. Pierson, <i>Handbook of refractory carbides and nitrides. 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Massalski, <i>Binary alloys phase diagrams</i> (ASM International, 1992).</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8334168&pid=S0035-001X200700050001000016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">17. JCPDS - International Center for Diffraction Data, carta # 44-11294 (1998)</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8334169&pid=S0035-001X200700050001000017&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">18.  J.A. Montes de Oca, Y. LePetitcorps, J.-P Manaud, J.A. Galaviz y J.R. Vargas Garc&iacute;a, En revisi&oacute;n <i>J. Vac. Sci. Technol. A </i>(2007).</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8334170&pid=S0035-001X200700050001000018&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> ]]></body><back>
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