<?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>0870-8312</journal-id>
<journal-title><![CDATA[Ciência & Tecnologia dos Materiais]]></journal-title>
<abbrev-journal-title><![CDATA[C.Tecn. Mat.]]></abbrev-journal-title>
<issn>0870-8312</issn>
<publisher>
<publisher-name><![CDATA[Sociedade Portuguesa de Materiais]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0870-83122006000100011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Comportamiento tribológico de materiales cerámicos de nitruro de silicio texturados]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Belmonte]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pablos]]></surname>
<given-names><![CDATA[A. de]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miranzo]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Osendi]]></surname>
<given-names><![CDATA[M.I.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gomes]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Consejo Superior de Investigaciones Cientificas Instituto de Cerámica y Vidrio ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidade do Minho Escola de Engenharia Departamento de Engenharia Mecânica]]></institution>
<addr-line><![CDATA[Guimarães ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2006</year>
</pub-date>
<volume>18</volume>
<numero>1-2</numero>
<fpage>73</fpage>
<lpage>78</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0870-83122006000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0870-83122006000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0870-83122006000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Dense textured Si3N4 materials have been processed adding &#946;-Si3N4 seeds and promoting their alignment with a combined processing/sintering route that includes extrusion and hot-pressing. These materials present a strong anisotropy in the microstructure that leads to anisotropic mechanical and tribological properties. Dry reciprocating self-mated ball-on-flat wear tests have been performed. The textured material presents a higher wear resistance than the reference one, non-textured, being abrasion by microcracking and pull-out of the Si3N4 grains the main wear mechanism. The surface of the textured specimen is protected by a third body developed during the wear test.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se han fabricado materiales densos de nitruro de silicio (Si3N4) texturados incorporando semillas de &#946;- Si3N4, favoreciendo su alineación mediante extrusión de las piezas en verde y prensado en caliente. Estos materiales presentan elevada anisotropía microestructural que conduce a un comportamiento anisótropo de sus propiedades, tanto mecánicas como tribológicas. Se han realizado ensayos de desgaste en seco mediante movimiento recíproco lineal de pares homólogos con geometría esfera-placa. El material texturado presenta mayor resistencia al desgaste que el de referencia, sin texturar, identificándose como principal mecanismo de desgaste la abrasión debida a microfractura y arranque de granos de Si3N4. En este material, además, se desarrolla un tercer cuerpo que protege la superficie del material.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Tribological behaviour]]></kwd>
<kwd lng="en"><![CDATA[Silicon nitride]]></kwd>
<kwd lng="en"><![CDATA[Textured materials]]></kwd>
<kwd lng="es"><![CDATA[Comportamiento tribológico]]></kwd>
<kwd lng="es"><![CDATA[Nitruro de Silicio]]></kwd>
<kwd lng="es"><![CDATA[Materiales texturados]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><b>Comportamiento tribológico de materiales cerámicos  de nitruro de silicio texturados </b></p>      <p>&nbsp;</p>      <p align="center">M. Belmonte<sup>(1)</sup>, A. de Pablos<sup>(1)</sup>, P. Miranzo<sup>(1)</sup>,    M.I. Osendi<sup>(1)</sup>, J.R. Gomes<sup>(2)*</sup></p>      <p>&nbsp;</p>      <p align="center"><sup>(1)</sup>Instituto de Cerámica y Vidrio, CSIC, Campus de    Cantoblanco, C/Kelsen S/N, 28049 Madrid, España.</p>     <p align="center"><sup>&nbsp;(2)*</sup> Departamento de Engenharia Mecânica, CIICS,    Universidade do Minho,</p>     <p align="center">Campus de Azurém, 4800-058 Guimarães, Portugal.</p>     <p align="center"><a href="mailto:jgomes@dem.uminho.pt">jgomes@dem.uminho.pt</a></p>      <p>&nbsp;</p>     <p>&nbsp;</p>      ]]></body>
<body><![CDATA[<p align="justify"><b>ABSTRACT: </b> Dense textured Si<sub>3</sub>N<sub>4</sub>    materials have been processed adding &#946;-Si<sub>3</sub>N<sub>4</sub> seeds    and promoting their alignment with a combined processing/sintering route that    includes extrusion and hot-pressing. These materials present a strong anisotropy    in the microstructure that leads to anisotropic mechanical and tribological    properties. Dry reciprocating self-mated ball-on-flat wear tests have been performed.    The textured material presents a higher wear resistance than the reference one,    non-textured, being abrasion by microcracking and pull-out of the Si<sub>3</sub>N<sub>4</sub>    grains the main wear mechanism. The surface of the textured specimen is protected    by a third body developed during the wear test.</p>     <p align="justify"><b>Keywords:</b> Tribological behaviour; Silicon nitride; Textured    materials.</p>      <p>&nbsp;</p>      <p align="justify"><b>RESUMEN: </b> Se han fabricado materiales densos de nitruro    de silicio (Si<sub>3</sub>N<sub>4</sub>) texturados incorporando semillas de    &#946;- Si<sub>3</sub>N<sub>4</sub>, favoreciendo su alineación mediante extrusión    de las piezas en verde y prensado en caliente. Estos materiales presentan elevada    anisotropía microestructural que conduce a un comportamiento anisótropo de sus    propiedades, tanto mecánicas como tribológicas. Se han realizado ensayos de    desgaste en seco mediante movimiento recíproco lineal de pares homólogos con    geometría esfera-placa. El material texturado presenta mayor resistencia al    desgaste que el de referencia, sin texturar, identificándose como principal    mecanismo de desgaste la abrasión debida a microfractura y arranque de granos    de Si<sub>3</sub>N<sub>4</sub>. En este material, además, se desarrolla un tercer    cuerpo que protege la superficie del material.</p>     <p align="justify"><b>Palavras llave: </b>Comportamiento tribológico; Nitruro    de Silicio; Materiales texturados.</p>      <p>&nbsp;</p>     <p>&nbsp;</p>      <p>Texto completo disponível apenas em PDF.</p>     <p>Full text only available in PDF format.</p>      <p>&nbsp;</p>     ]]></body>
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<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Petzow]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Herrmann]]></surname>
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</person-group>
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</article>
