{"id":21189,"date":"2022-07-14T16:56:16","date_gmt":"2022-07-14T16:56:16","guid":{"rendered":"https:\/\/nanovea.com\/?p=21189"},"modified":"2025-05-22T19:11:09","modified_gmt":"2025-05-22T19:11:09","slug":"dureza-ao-risco-a-alta-temperatura-utilizando-um-tribometro","status":"publish","type":"post","link":"https:\/\/nanovea.com\/pt\/dureza-ao-risco-a-alta-temperatura-utilizando-um-tribometro\/","title":{"rendered":"Dureza de Arranh\u00e3o a Alta Temperatura usando um Trib\u00f4metro"},"content":{"rendered":"
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DUREZA DE ARRANH\u00d5ES A ALTAS TEMPERATURAS<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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USANDO UM TRIB\u00d4METRO<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Preparado por<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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DUANJIE, PhD<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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INTRODU\u00c7\u00c3O<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A dureza mede a resist\u00eancia dos materiais \u00e0 deforma\u00e7\u00e3o permanente ou pl\u00e1stica. Desenvolvido originalmente por um mineralogista alem\u00e3o Friedrich Mohs em 1820, o teste de dureza de arranh\u00f5es determina a dureza de um material a arranh\u00f5es e abras\u00e3o devido ao atrito de um objeto cortante.1<\/sup>. A escala de Mohs \u00e9 um \u00edndice comparativo e n\u00e3o uma escala linear, portanto uma medi\u00e7\u00e3o de dureza de arranh\u00f5es mais precisa e qualitativa foi desenvolvida como descrito na norma ASTM G171-03.2<\/sup>. Ele mede a largura m\u00e9dia do risco criado por um estilete de diamante e calcula o n\u00famero de dureza do risco (HSP).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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IMPORT\u00c2NCIA DA MEDI\u00c7\u00c3O DA DUREZA DOS ARRANH\u00d5ES EM ALTAS TEMPERATURAS<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Os materiais s\u00e3o selecionados com base nas exig\u00eancias do servi\u00e7o. Para aplica\u00e7\u00f5es que envolvem mudan\u00e7as significativas de temperatura e gradientes t\u00e9rmicos, \u00e9 fundamental investigar as propriedades mec\u00e2nicas dos materiais a altas temperaturas para estar plenamente ciente dos limites mec\u00e2nicos. Os materiais, especialmente os pol\u00edmeros, geralmente amolecem a altas temperaturas. Muitas falhas mec\u00e2nicas s\u00e3o causadas pela deforma\u00e7\u00e3o por flu\u00eancia e fadiga t\u00e9rmica ocorrendo apenas a temperaturas elevadas. Portanto, uma t\u00e9cnica confi\u00e1vel para medir a dureza a altas temperaturas \u00e9 necess\u00e1ria para garantir uma sele\u00e7\u00e3o adequada dos materiais para aplica\u00e7\u00f5es a altas temperaturas.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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OBJETIVO DA MEDI\u00c7\u00c3O<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Neste estudo, o Trib\u00f4metro NANOVEA T50 mede a dureza ao risco de uma amostra de Teflon em diferentes temperaturas, desde a temperatura ambiente at\u00e9 300\u00baC. A capacidade de realizar medi\u00e7\u00f5es de dureza a riscos em alta temperatura torna o NANOVEA Trib\u00f4metro <\/a>um sistema vers\u00e1til para avalia\u00e7\u00f5es tribol\u00f3gicas e mec\u00e2nicas de materiais para aplica\u00e7\u00f5es em altas temperaturas.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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NANOVEA<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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T50<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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CONDI\u00c7\u00d5ES DE TESTE<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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O Trib\u00f4metro NANOVEA T50 Free Weight Standard foi usado para realizar os testes de dureza de arranh\u00f5es em uma amostra de Teflon a temperaturas que variam da temperatura ambiente (RT) a 300\u00b0C. O teflon tem um ponto de derretimento de 326,8\u00b0C. Foi utilizada uma ponta diamantada c\u00f4nica de \u00e2ngulo de \u00e1pice de 120\u00b0 com raio de ponta de 200 \u00b5m. A amostra de teflon foi fixada no est\u00e1gio rotativo da amostra com uma dist\u00e2ncia de 10 mm at\u00e9 o centro do est\u00e1gio. A amostra foi aquecida por um forno e testada a temperaturas de RT, 50\u00b0C, 100\u00b0C, 150\u00b0C, 200\u00b0C, 250\u00b0C e 300\u00b0C.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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PAR\u00c2METROS DE TESTE<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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da medi\u00e7\u00e3o da dureza de arranh\u00f5es a alta temperatura<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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FOR\u00c7A NORMAL<\/strong><\/em><\/td>\n2 N<\/strong><\/em><\/td>\n<\/tr>\n
VELOCIDADE DE DESLIZAMENTO<\/strong><\/em><\/td>\n1 mm\/s<\/strong><\/em><\/td>\n<\/tr>\n
DIST\u00c2NCIA DE DESLIZAMENTO<\/strong><\/em><\/td>\n8mm por temperatura<\/strong><\/em><\/td>\n<\/tr>\n
ATMOSPHERE<\/strong><\/em><\/td>\nAr<\/strong><\/em><\/td>\n<\/tr>\n
TEMPERATURA<\/strong><\/em><\/td>\nRT, 50\u00b0C, 100\u00b0C, 150\u00b0C, 200\u00b0C, 250\u00b0C, 300\u00b0C.<\/strong><\/em><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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RESULTADOS & DISCUSS\u00c3O<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Os perfis de arranh\u00f5es da amostra de Teflon em diferentes temperaturas s\u00e3o mostrados no FIGURA 1 para comparar a dureza do arranh\u00e3o em diferentes temperaturas elevadas. O ac\u00famulo de material nas bordas da trilha de arranh\u00e3o se forma \u00e0 medida que a ponta se desloca a uma velocidade constante viaja com uma carga constante de 2 N e arado na amostra de Teflon, empurrando e deformando o material no arranh\u00e3o para o lado.<\/p>

Os rastros de arranh\u00f5es foram examinados sob o microsc\u00f3pio \u00f3tico, como mostrado na FIGURA 2. As larguras dos arranh\u00f5es medidas e os n\u00fameros calculados de dureza de arranh\u00e3o (HSP) s\u00e3o resumidos e comparados na FIGURA 3. A largura do arranh\u00e3o medida pelo microsc\u00f3pio est\u00e1 de acordo com a medida usando o Perfil\u00f4metro NANOVEA - a amostra de Teflon exibe uma largura de arranh\u00e3o maior a temperaturas mais altas. Sua largura de arranh\u00e3o aumenta de 281 para 539 \u00b5m \u00e0 medida que a temperatura se eleva de RT para 300oC, resultando na diminui\u00e7\u00e3o do HSP de 65 para 18 MPa.<\/p>

A dureza dos arranh\u00f5es em temperaturas elevadas pode ser medida com alta precis\u00e3o e repetibilidade usando o Trib\u00f4metro NANOVEA T50. Ele fornece uma solu\u00e7\u00e3o alternativa a partir de outras medi\u00e7\u00f5es de dureza e faz do NANOVEA Tribometer um sistema mais completo para avalia\u00e7\u00f5es tribo-mec\u00e2nicas abrangentes em alta temperatura.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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FIGURA 1:<\/span>\u00a0<\/span>Perfis de arranh\u00f5es ap\u00f3s os testes de dureza de arranh\u00e3o em diferentes temperaturas.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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FIGURA 2:<\/span> Arranh\u00f5es sob o microsc\u00f3pio ap\u00f3s as medi\u00e7\u00f5es em diferentes temperaturas.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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FIGURA 3:<\/span> Evolu\u00e7\u00e3o da largura da pista de Arranh\u00f5es e da dureza da Arranh\u00e3o em rela\u00e7\u00e3o \u00e0 temperatura.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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CONCLUS\u00c3O<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Neste estudo, mostramos como o Trib\u00f4metro NANOVEA mede a dureza dos arranh\u00f5es a temperaturas elevadas em conformidade com a norma ASTM G171-03. O teste de dureza de arranh\u00f5es com carga constante fornece uma solu\u00e7\u00e3o alternativa simples para comparar a dureza dos materiais usando o trib\u00f4metro. A capacidade de realizar medi\u00e7\u00f5es de dureza de arranh\u00f5es a temperaturas elevadas faz do Trib\u00f4metro NANOVEA uma ferramenta ideal para avaliar as propriedades tribo-mec\u00e2nicas de materiais a altas temperaturas.<\/p>

O Trib\u00f4metro NANOVEA tamb\u00e9m oferece testes de desgaste e atrito precisos e repet\u00edveis usando os modos rotativo e linear conforme ISO e ASTM, com m\u00f3dulos opcionais de desgaste a alta temperatura, lubrifica\u00e7\u00e3o e tribo-corros\u00e3o dispon\u00edveis em um sistema pr\u00e9-integrado. O Perfil\u00f4metro 3D sem contato opcional est\u00e1 dispon\u00edvel para imagens 3D de alta resolu\u00e7\u00e3o de faixas de desgaste, al\u00e9m de outras medi\u00e7\u00f5es de superf\u00edcie, como rugosidade.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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1 <\/span>Wredenberg, Fredrik; PL Larsson (2009). \"Teste de arranh\u00e3o de metais e pol\u00edmeros: Experimentos e num\u00e9ricos\". Desgaste 266 (1-2): 76
<\/span>2 <\/span>ASTM G171-03 (2009), \"Standard Test Method for Scratch Hardness of Materials Using a Diamond Stylus<\/span> <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Tem um aplicativo semelhante?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tCONVERSE COM UM ESPECIALISTA AGORA<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tOBTENHA PRE\u00c7OS E DETALHES RAPIDAMENTE<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

HIGH TEMPERATURE SCRATCH HARDNESS USING A TRIBOMETER Prepared by DUANJIE, PhD INTRODUCTION Hardness measures the resistance of materials to permanent or plastic deformation. Originally developed by a German mineralogist Friedrich Mohs in 1820, scratch hardness test determines the hardness of a material to scratches and abrasion due to friction from a sharp object1. The Mohs’ […]<\/p>","protected":false},"author":1,"featured_media":21184,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[7,339,378,349,337,347,377,336],"tags":[],"class_list":["post-21189","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application-notes","category-high-temperature-mechanical-testing","category-high-temperature-tribology","category-laboratory-testing","category-mechanical-testing","category-scratch-testing-scratch-hardness","category-scratch-testing-tribology","category-tribology-testing"],"_links":{"self":[{"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/posts\/21189","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/comments?post=21189"}],"version-history":[{"count":20,"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/posts\/21189\/revisions"}],"predecessor-version":[{"id":24690,"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/posts\/21189\/revisions\/24690"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/media\/21184"}],"wp:attachment":[{"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/media?parent=21189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/categories?post=21189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nanovea.com\/pt\/wp-json\/wp\/v2\/tags?post=21189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}