Materiais de Engenharia e Revestimentos de Superfície
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Materiais de Engenharia e Revestimentos de Superfície

Materiais de Engenharia e Revestimentos de Superfície


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About the Book

A primeira utilização de adesivos foi descoberta no centro de Itália quando foram encontrados dois flocos de pedra parcialmente cobertos com alcatrão de bétula e uma terceira pedra descoberta da era do Pleistoceno Médio (cerca de 200.000 anos atrás). Pensa-se que esta é a mais antiga utilização humana descoberta de pedras de alcatrão. O adesivo de alcatrão de bétula é um adesivo simples, de um só componente. Embora suficientemente pegajoso, os adesivos à base de plantas são frágeis e vulneráveis às condições ambientais. O primeiro uso de adesivos compostos foi descoberto em Sibudu, África do Sul. Aqui, foram descobertos segmentos de pedra com 70.000 anos de idade que foram outrora inseridos em machados cobertos com um adesivo composto de goma vegetal e ocre vermelho (óxido de ferro natural), pois a adição de ocre à goma vegetal produz um produto mais forte e protege a goma de se desintegrar em condições húmidas. A capacidade de produzir adesivos mais fortes permitiu aos seres humanos da Idade Média fixar segmentos de pedra a paus em maiores variações, o que levou ao desenvolvimento de novas ferramentas.


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Product Details
  • ISBN-13: 9786205767887
  • Publisher: KS Omniscriptum Publishing
  • Binding: Paperback
  • Language: Portuguese
  • Returnable: N
  • Weight: 168 gr
  • ISBN-10: 6205767880
  • Publisher Date: 07 Mar 2023
  • Height: 229 mm
  • No of Pages: 72
  • Spine Width: 4 mm
  • Width: 152 mm


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