Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
619419 | Wear | 2008 | 9 Pages |
Abstract
As-synthesized and calcined DAM-1 (Dallas Amorphous Material-1) mesoporous silica were used as particulate reinforcements in an epoxy matrix. The mesocomposites showed enhanced tribological properties over the base epoxy. The particles were introduced as both as-synthesized and calcined forms to evaluate the effect of porosity on tribological behavior. Epoxy-DAM1 as-synthesized (DSE) mesocomposites exhibited the longest duration low coefficient of friction (COF) values during the run-in regime as well as the lowest COF values in the higher friction regime. These results were attributed to the low cross-linking density envelope around the as-synthesized particles and their plate-like morphology which work together to form friction-lowering transfer films. Subsurface HRSEM imaging using focused ion beam (FIB) cross-sectioning inside wear tracks showed that shear band formation is the mode of deformation in DSE, while for Epoxy-DAM1 calcined (DCE) mesocomposites and pure epoxy, it was determined to be surface fatigue resulting from brittle cracking. This study shows that the as-synthesized particles increase the toughness of the epoxy by altering the mode of deformation and wear debris formation.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
Maia C. Romanes, Nandika A. D'Souza, Decio. Coutinho, Kenneth J. Jr., Thomas W. Scharf,