Revestimento a frio e a quente de laminados compósitos poliméricos de fibra de carbono para resistência a abrasão severa
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Data
2018-01-26
Autores
Campos, Marcelo Capella de
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Universidade Estadual Paulista (Unesp)
Resumo
Os laminados de compósitos poliméricos possuem um valor já consagrado dentro das aplicações mecânicas e industriais. Sua versatilidade aliada a suas propriedades mecânicas, incentivam o aumento das aplicações, devido em partes pela facilidade de construção, tornando-os competitivos com relação a outros materiais. O conhecimento sobre a matriz polimérica, que possui inúmeras variações e aplicações, neste trabalho contou com o estudo de três tipos, sendo duas do grupo bisfenol “a” e uma do grupo bisfenol “f”. A caracterização destas matrizes através das técnicas de TG e DSC, influenciaram na escolha em virtude da aplicação a qual seriam submetidas. E sobre o reforço, que neste estudo, utilizou tecidos de fibra de carbono em trama de tela. O processo de fabricação dos laminados através de infusão a vácuo contribuiu para um resultado satisfatório, demonstrando vantagens com relação à melhor impregnação e minimizando os possíveis vazios na matriz. Os dois tipos de revestimento aplicados nestes laminados, sendo um chamado de revestimento a frio, que é um produto composto por três tipos de materiais distintos, metal, cerâmica e polímeros e o segundo a aspersão térmica, através da técnica de aspersão por chama de arames, contendo carbeto de tungstênio, recobriram o material de forma eficiente, mantendo boa adesão superficial. Estes laminados recobertos tem a finalidade de terem a vida útil aumentada e proporcionar uma maior resistência a abrasão severa. Os ensaios mecânicos aplicados demonstram as boas características destes materiais, juntamente com a caracterização por microscopia óptica e microscopia eletrônica de varredura, revelaram a boa adesão entre laminados e revestimentos, concluindo que existe uma boa identidade para estes materiais, sendo uma das principais conclusões.
The laminates of polymeric composites have an already established value within the mechanical and industrial applications. Its versatility combined with its mechanical properties, encourage the increase the applications, due in part for the ease of construction, making them competitive with respect to other materials. The knowledge about the polymer matrix, which has numerous variations and applications, in this work had the study of three types, two of the bisphenol group "a" and one of the bisphenol "f" group. The characterization of these matrices through TG and DSC techniques influenced the choice by virtue of the application to which they would be submitted. And on the reinforcement, which in this study, used carbon fiber fabrics in screen fabric. The process of manufacturing the laminates through vacuum infusion contributed to a satisfactory result, demonstrating advantages in relation to the better impregnation and minimizing voids in the matrix. The two types of coating applied on these laminates, one called cold coating, which is a product composed of three different types of materials, metal, ceramic and polymers and the second the thermal spray, by the flame spray technique of wires , Containing tungsten carbide, coated the material efficiently, maintaining good surface adhesion. These coated laminates have the purpose of having increased shelf life and providing greater resistance to severe abrasions. The applied mechanical tests demonstrate the good characteristics of these materials, together with the characterization by optical microscopy and scanning electron microscopy, revealed the good adhesion between laminates and coatings, concluding that there is a good identity for these materials.
The laminates of polymeric composites have an already established value within the mechanical and industrial applications. Its versatility combined with its mechanical properties, encourage the increase the applications, due in part for the ease of construction, making them competitive with respect to other materials. The knowledge about the polymer matrix, which has numerous variations and applications, in this work had the study of three types, two of the bisphenol group "a" and one of the bisphenol "f" group. The characterization of these matrices through TG and DSC techniques influenced the choice by virtue of the application to which they would be submitted. And on the reinforcement, which in this study, used carbon fiber fabrics in screen fabric. The process of manufacturing the laminates through vacuum infusion contributed to a satisfactory result, demonstrating advantages in relation to the better impregnation and minimizing voids in the matrix. The two types of coating applied on these laminates, one called cold coating, which is a product composed of three different types of materials, metal, ceramic and polymers and the second the thermal spray, by the flame spray technique of wires , Containing tungsten carbide, coated the material efficiently, maintaining good surface adhesion. These coated laminates have the purpose of having increased shelf life and providing greater resistance to severe abrasions. The applied mechanical tests demonstrate the good characteristics of these materials, together with the characterization by optical microscopy and scanning electron microscopy, revealed the good adhesion between laminates and coatings, concluding that there is a good identity for these materials.
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Compósitos poliméricos, Revestimento a frio, Revestimento a quente, Polymer composites, Cold coating, Hot coating