Tintas para fundição
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Tintas para Fundição Quase sempre: servem para que a face de molde ou macho seja mais lisa lisa e mais resistente resistente à agressão agressão pelo pelo metal metal líquido – dimi diminu nuin indo do a rug rugos osid idad adee nas nas peça peçass fund fundid idas as – evitan evitando do event eventuai uaiss reaçõe reaçõess decorr decorrente entess do conta contato to diret direto o da face face do molde com o metal líquido ou seus produtos de oxidação
Às veze vezes: s: usam usam-se -se tintas tintas cuja cuja únic únicaa funç função ão é condic condicion ionar ar a atmosfera do molde e que de modo algum evitam o contato direto do metal líquido com as faces do molde ou macho As tintas de fundição mais simples consistem de – mate materi riai aiss sóli sólido doss (carga (carga)) em susp suspen ensão são em em algu algum m – meio meio de disp dispers ersão ão (veíc (veícul ulo) o) líqu líquid ido oe
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Tintas para Fundição Até ~ 1950 qualquer qualquer tinta para moldes moldes ou machos machos era formulad formuladaa na própria fundição. As formulações de tintas constituíam parte importante do patrimônio técnico das fundições, sendo, portanto, tratadas com confidencialidade. Dependendo do tipo de ligante empregado para fixar a camada aplicada, o conjunto meio de dispersão / ligante podia enquadrar-se em uma das seguintes categorias: – Soluçõ Soluções es aquos aquosas as de dext dextrina rina,, melaç melaço, o, açúcar açúcares, es, amid amidos os e resi resinas nas sintéticas – Soluçõ Soluções es alco alcoóli ólicas cas de resi resinas nas natura naturais is ou ou sinté sintétic ticas as – Solu Soluçõ ções es de de acet acetat ato o de celu celulo lose se em em acet aceton onaa – Soluçõ Soluções es aquos aquosas as de sili silicat catos os solúv solúveis eis (de (de sódio sódio ou ou de potás potássio sio). ).
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Tintas para Fundição
Com a progressiva redução da espessura de parede dos fundidos e da seção dos machos, as tintas existentes no mercado tendem a atingir seu limite de aplicação, e começam a apresentar problemas com porosidades e bolhas de gases, motivando os desenvolvimentos mais recentes. Estes objetivam chegar a produtos com menor geração de gases, principalmente através de: 1.
Elev levada capac pacida idade de de is isolamento tér térm mico ico de de mo modo a retardar a transferência de calor
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Funções Melhorar características superficiais do macho ou molde – Dureza – Resist istênc ência a Friabili bilida dad de Melhorar o aspecto do fundido quanto a – Rugosidade – Aderências – Limpeza Reduzir / eliminar defeitos superficiais tais como – Veiamento – Penetração – Bolhas de gases – Supe Superf rfíc ície ie com com do dobras bras – Escamas
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Composição básica
A composição de uma moderna tinta para fundição tem os mesmos elementos básicos das primeiras tintas, compondo-se sempre de: • uma ou mais cargas minerais, minerais, desde refratárias até altamente refratárias • meio de dispersão ou veículo • agentes de suspensão, suspensão, em geral coloidais
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Cargas minerais As cargas cargas minerai mineraiss mais mais empreg empregada adass nas formul formulaçõ ações es de tintas para fundição podem ser assim classificadas:
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Cargas minerais Carbonáceas
Carga Mineral Grafite Coque
Carga Mineral
Densidade
Ponto de Fusão °C
Formato de Grão
Composição
aprox. 2,2 1,9 – 2
1.600 - 5.000 > 1.700
irregular, angular-lamelar irregular
70 % C 90 % C
Densidade
Ponto de Fusão, °C
Formato de Grão
Fórmula
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Cargas minerais Silicatos com estrutura lamelar têm lamelar têm papel importante: – Na cama camada da apli aplicad cada, a, as as lamel lamelas as disp dispõeõe-se se para paralel lelame amente nte à superfície pintada Æ é poss possív ível el um desli esliza zame ment nto o entr entree elas elas Æ camada de tinta tinta pode pode deformar-s deformar-see (sem se se romper) romper) preservando preservando
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Cargas minerais: aços Temperaturas de fusão elevadas e características metalúrgicas restringem o leque de materiais que podem ser empregados ZIRCONITA
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Cargas minerais: ferros fundidos
Empregam-se praticamente todos os tipos de cargas minerais
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Agentes de suspensão
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