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COMPARATIVO DOS PROCESSOS INDUSTRIAIS DE NITRETAÇÃO

           Característica                  Gás Convencional              Banho de Sal                          Iônica
 Controle do Potencial de Nitrogênio          Sem controle                 Sem controle                      Com controle
     Controlar tipos de Nitretos
                                                   Não                           Não                              Sim
       (ε e γ’ ) - Camada Branca
Nitretação sem formar Camada Branca             Limitado                         Não                              Sim
      Temperatura de Nitretação               500 – 550 ºC                 540 – 570 ºC                    (150) 300 – 600 ºC
Tempo para se obter a mesma espessura de                          Limitado (depende da profundidade
 camada (à mesma temperatura) Nitretada
                                              Mais Tempo                      de camada)
                                                                                                            Menos Tempo
              Rugosidade                     Altera até 150%              Altera até 500%                Altera entre 20 e 50%
              Porosidade                      Presente (fina)     Presente (até 80% da Camada Branca)    Muito fina, ou ausente
  Limpeza (condição da superfície para           Limpa                         Limpa                        Muito (!) limpa
               nitretação)
                                           Depende da densidade
           Ferro sinterizado                  (>= 7,0 g/cm3)
                                                                            Não aplicável               Independe da densidade
      Operação do equipamento                   Simples                       Simples                   Medianamente Simples
        Montagem da carga                       Simples                       Simples                           Simples
   (para peças de geometria diferentes)
         Montagem da carga                      Simples                       Simples                   Depende de Dispositivo
    (para peças de mesma geometria)
         Ocupação do Forno                      Máxima                       Máxima                            60 – 90%
           Aço Inoxidável                      Não nitreta                    Nitreta                           Nitreta
           Meio-ambiente                      Não amigável                 Não-amigável                        Amigável

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Comparativo Processos Nitretação

  • 1. COMPARATIVO DOS PROCESSOS INDUSTRIAIS DE NITRETAÇÃO Característica Gás Convencional Banho de Sal Iônica Controle do Potencial de Nitrogênio Sem controle Sem controle Com controle Controlar tipos de Nitretos Não Não Sim (ε e γ’ ) - Camada Branca Nitretação sem formar Camada Branca Limitado Não Sim Temperatura de Nitretação 500 – 550 ºC 540 – 570 ºC (150) 300 – 600 ºC Tempo para se obter a mesma espessura de Limitado (depende da profundidade camada (à mesma temperatura) Nitretada Mais Tempo de camada) Menos Tempo Rugosidade Altera até 150% Altera até 500% Altera entre 20 e 50% Porosidade Presente (fina) Presente (até 80% da Camada Branca) Muito fina, ou ausente Limpeza (condição da superfície para Limpa Limpa Muito (!) limpa nitretação) Depende da densidade Ferro sinterizado (>= 7,0 g/cm3) Não aplicável Independe da densidade Operação do equipamento Simples Simples Medianamente Simples Montagem da carga Simples Simples Simples (para peças de geometria diferentes) Montagem da carga Simples Simples Depende de Dispositivo (para peças de mesma geometria) Ocupação do Forno Máxima Máxima 60 – 90% Aço Inoxidável Não nitreta Nitreta Nitreta Meio-ambiente Não amigável Não-amigável Amigável