INVESTIGADORES
FAILLA Marcelo Daniel
artículos
Título:
The Effect of Crosslinks on the Sliding Wear of High-Density Polyethylene
Autor/es:
ERICA MOLINARI; MARCELO D. FAILLA; WALTER TUCKART
Revista:
TRIBOLOGY LETTERS
Editorial:
SPRINGER/PLENUM PUBLISHERS
Referencias:
Lugar: New York; Año: 2016
ISSN:
1023-8883
Resumen:
The purpose of this study is to analyze the wearbehavior of crosslinked high density polyethylene (HDPE) sliding on steel inorder to know the influence of the molecular structure on the wear performanceof the material. Materials with different molecular structures were generatedby modifying a HDPE with various concentrations of organic peroxide. Thetechnique of solvent extraction was used to characterize the molecularstructure and determine parameters such as gel content, solvent swelling and molecularweight between crosslink. The crystallinity level and the Vickers microhardnesswere determined in the materials. The tribological properties were evaluated byperforming block-on-ring wear tests under controlled ambient temperature. Thewear studies was carried out at constant sliding velocity (v = 0.63 m/s) ofsteel ring and at different loads, 10, 15 and 20N. The wear results show thatthe materials modified with concentrations of peroxide lower than 0.5 wt% havehigher wear rate than the unmodified polymer. The materials modified withhigher peroxide concentration display decreasing wear rate with the peroxideconcentration, reaching values much lower than the corresponding to theoriginal polymer when the peroxide concentration is larger than 1 wt%. The wornand steel ring surfaces have been observed using optical microscope andscanning electron microscope (SEM) to the possible wear mechanisms involvedduring abrasive processes