Resumo

SILVA, Carlos H.; GIRALDO, Diego H.; SOUZA, Roberto .M.  e  SINATORA, Amilton. Estudo da influência das características do contra-corpo na taxa de desgaste do polioximetileno em ensaio pino-contra-disco. C.Tecn. Mat. [online]. 2006, vol.18, n.1-2, pp.87-94. ISSN 0870-8312.

The aim of this work is to study the effect of the roughness and the type of counter-face in the wear rate of the polyoximethylene copolymer (POM), resultant of the sliding contact against rigid bodies. For this, was realized wear tests in a pin-on-disk tribometer, with polymeric pins and disks confectioned in alumina (Al₂O₃) and duplex stainless steel (austenitic-ferritic). In the wear tests, were used 3 values of applied load, 3 sliding velocities and 2 levels of surface finishing of the counter-face. For each test condition, 3 experiments were realized. During the tests, the temperature near to the contact of the materials, the friction force and the height of the pin had been monitored. The variation of the pin height, measured with a linear sensor of position (LVDT) was used for the determination of the wear rate of polymer. The tests had been carried through in environment with controlled relative humidity in 50 ± 5 % and the sliding distance were of 3.500 meters During the tribologic tests, the POM pin, a thermoplastic material, were submitted shears and, mainly, compressive efforts for periods of 1 at 10 hours. However, it was verified that the compressive efforts had not been enough to modify the height of the pin for fluency. The results of wear rate had shown that the capacity to dissipate the heat generated during the tests is one of the characteristics most important of the counter-face, or either, the wear of the POM sliding against alumina was, for the two levels of roughness, more raised than in the tests against stainless steel.

Palavras-chave : LVDT; Polyoximethylene; Wear; Alumina; Duplex Stainless Steel.

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