ANÁLISE SOBRE A REPRODUTIBILIDADE DE RESULTADOS E FRAGMENTAÇÃO DE PARTÍCULAS ABRASIVAS EM ENSAIOS BALL-CRATERING
RESEARCH ABOUT RESULTS REPRODUTIBILITY AND ABRASIVE PARTICLES RAGMENTATION IN BALL-CRATERING TESTS
Cozza, Ronaldo Câmara
http://dx.doi.org/10.4322/tmm.2013.015
Tecnol. Metal. Mater. Min., vol.10, n2, p.103-111, 2013
Resumo
Os ensaios de desgaste micro-abrasivo por esfera rotativa vêm demonstrando uma participação importante em pesquisas que envolvem desgaste abrasivo. O contato entre um corpo de prova e uma esfera em movimento de rotação e a inserção de partículas abrasivas entre estes dois elementos gera uma cratera no corpo de prova, por intermédio da qual é analisado o comportamento ao desgaste do material ensaiado. O propósito deste trabalho é abordar a reprodutibilidade de resultados e a fragmentação de partículas abrasivas de carbeto de silício (SiC). Foram conduzidos ensaios com esferas de aço AISI 1010 cementado e corpos-de-prova de aço rápido, "com" e "sem" revestimento de nitreto de titânio (TiN). A pasta abrasiva foi preparada com carbeto de silício preto (tamanho médio de partícula de 5 μm) e água destilada. Na análise, observa-se que o modo de desgaste abrasivo por riscamento está relacionado a resultados de reprodutibilidade relativamente baixa. Para as condições de ensaios estabelecidas, não observa-se a fragmentação das partículas abrasivas, independente da distância de deslizamento, o que pode ser justificado, entre outros fatores, pela baixa força normal aplicada. Palavras-chave: Desgaste micro-abrasivo; Aço rápido; Nitreto de titânio; Carbeto de silício.
Palavras-chave
Desgaste micro-abrasivo, Aço rápido, Nitreto de titânio, Carbeto de silício
Abstract
The micro-abrasive wear tests by rotating ball (crater wear) have played an important role in abrasive wear researches. In this type of test, the contact between a specimen and a ball on rotating motion and abrasive particles supplied between these two elements, results in a crater on the specimen, based on which the abrasive wear behaviour is analysed. The purpose of this work is to study results the reprodutibility and the silicon carbide (SiC) abrasive particles fragmentation during micro-abrasive wear tests. Tests were conducted with carburized AISI 1010 steel balls and high speed steel specimens, "with" and "without" titanium nitride (TiN) coatings. The abrasive slurry was prepared with black silicon carbide (average particle size of 5 μm) and distilled water. Grooving abrasion is related with lower reprodutibility results. For the test conditions of this work, no abrasive particles fragmentation was observed, independently of the sliding distance, what is justified, among others factors, by the low normal force applied. Key words: Micro-abrasive wear; High speed steel; Titanium nitride; Silicon carbide.
Keywords
Micro-abrasive wear, High speed steel, Titanium nitride, Silicon carbide
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