INFLUÊNCIA DO TRATAMENTO TÉRMICO NA RESISTÊNCIA AO DESGASTE DE REVESTIMENTOS DE NÍQUEL QUÍMICO COM ALTO TEOR DE FÓSFORO
EFFECT OF HEAT TREATMENT ON THE WEAR BEHAVIOUR OF ELECTROLESS HIGH PHOSPHORUS NICKEL COATING
Goettems, Felipe Samuel; Ferreira, Jane Zoppas
Resumo
No presente trabalho foi avaliada a resistência ao desgaste de revestimentos de níquel químico com alto teor de fósforo (9-10% P) após passar por três diferentes condições de tratamento térmico, incluindo a condição de como depositado, ou seja, sem tratamento posterior. Os tratamentos foram realizados nas temperaturas de 320ºC, 400ºC e 500ºC em diferentes tempos, sendo estas condições escolhidas com base no resultado do ensaio de calorimetria exploratória diferencial (DSC). Feito isso as amostras foram então caracterizadas através do ensaio de desgaste do tipo “ball on plate”, para depois suas trilhas de desgaste serem avaliadas em microscópio. Ao final, chegou-se à conclusão de que o tratamento térmico afeta de forma positiva a resistência ao desgaste dos depósitos de Ni-P, tendo como 320ºC por 9 horas e 400ºC por 1 hora as condições que apresentaram o melhor resultado. Este fato se deve a transformação de sua estrutura amorfa para uma estrutura cristalina de níquel com precipitados de Ni3 P ocorrida entre 320ºC e 360ºC, verificada através da difração de raios-X (DRX).
Palavras-chave
Abstract
In this present work was studied the influence of heat treatment on the wear resistance of electroless high phosphorus nickel coating (9-10% P wt.). Three different treatment conditions as well as untreated condition were evaluated at temperatures of 320ºC, 400ºC and 500ºC under different holding times. The selection of the heat treatment conditions was chosen considering the result obtained by a differential scanning calorimetry (DSC) analysis. The wear behaviour of the Ni-P samples was investigated through a non-lubricated ball on plate test and the results showed that the heat treatment affect positively the wear resistance of Ni-P coatings. Treatment conditions of 320ºC with 9 hours holding time and 400ºC with 1 hour holding time showed the best results due to a structural change from amorphous supersatured solid solution of phosphorus in nickel to a crystalline structure of nickel crystallites and nickel phosphides (Ni3 P) occurred between 320ºC and 360ºC verified after X-ray analysis.
Keywords
Referências
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