Influences of Porosity on Mechanical and Wear Performance of Pseudoelastic TiNi-Matrix Composites

Ye, H. Z.; Li, D. Y.; Eadie, R.L.

doi:10.1361/105994901770345196

Cited by 27 publications

(15 citation statements)

References 10 publications

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“…In recent years, the tribological behavior of porous surfaces has been studied in numerous investigations. These works have demonstrated the positive influence of porosity on the tribological behavior of different ceramics [7], composites [8, 9] and metal alloys [10, 11], by trapping wear debris and acting as oil reservoirs, resulting in an improved wear resistance and lower friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

Tribological and thermal stability study of nanoporous amorphous boron carbide films prepared by pulsed plasma chemical vapor deposition

Liza

Ohtake

Akasaka

et al. 2015

Science and Technology of Advanced Materials

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In this work, the thermal stability and the oxidation and tribological behavior of nanoporous a-BC:H films are studied and compared with those in conventional diamond-like carbon (DLC) films. a-BC:H films were deposited by pulsed plasma chemical vapor deposition using B(CH3)3 gas as the boron source. A DLC interlayer was used to prevent the a-BC:H film delamination produced by oxidation. Thermal stability of a-BC:H films, with no delamination signs after annealing at 500 °C for 1 h, is better than that of the DLC films, which completely disappeared under the same conditions. Tribological test results indicate that the a-BC:H films, even with lower nanoindentation hardness than the DLC films, show an excellent boundary oil lubricated behavior, with lower friction coefficient and reduce the wear rate of counter materials than those on the DLC film. The good materials properties such as low modulus of elasticity and the formation of micropores from the original nanopores during boundary regimes explain this better performance. Results show that porous a-BC:H films may be an alternative for segmented DLC films in applications where severe tribological conditions and complex shapes exist, so surface patterning is unfeasible.

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Section: Introductionmentioning

confidence: 99%

Tribological and thermal stability study of nanoporous amorphous boron carbide films prepared by pulsed plasma chemical vapor deposition

Liza

Ohtake

Akasaka

et al. 2015

Science and Technology of Advanced Materials

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“…The stress distribution within the membrane at a given pressure determines the way in which compaction proceeds [15]. A highly porous material is subject to a larger stress distribution than a less porous material; therefore, compaction will preferentially occur in the porous support layer of a membrane [17]. Because pores are the least mechanically stable regions of a membrane, it is the macrovoid walls that respond greatest to applied pressures [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…A highly porous material is subject to a larger stress distribution than a less porous material; therefore, compaction will preferentially occur in the porous support layer of a membrane [17]. Because pores are the least mechanically stable regions of a membrane, it is the macrovoid walls that respond greatest to applied pressures [17,18]. As pressure is applied, pore walls become denser and macrovoids become smaller, resulting in increased tortuosity and decreased flux across the membrane [10,19,20].…”

Section: Introductionmentioning

confidence: 99%

Using nanocomposite materials technology to understand and control reverse osmosis membrane compaction

et al. 2010

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Composite reverse osmosis (RO) membranes were formed by interfacial polymerization of polyamide thin films over pure polysulfone and nanocomposite-polysulfone support membranes. Nanocomposite support membranes were formed from amorphous non-porous silica and crystalline microporous zeolite nanoparticles. For each hand-cast membrane, water flux and NaCl rejection were monitored over time at two different applied pressures. Nanocomposite-polysulfone supported RO membranes generally had higher initial permeability and experienced less flux decline due to compaction than pure polysulfone supported membranes. In addition, observed salt rejection tended to increase as flux declined from compaction. Crosssectional SEM images verified significant reduction in thickness of pure polysulfone supports, whereas nanocomposites better resisted compaction due to enhanced mechanical stability imparted by the nanoparticles. A conceptual model was proposed to explain the mechanistic relationship between support membrane compaction and observed changes in water flux and salt rejection. As the support membrane compacts, skin layer pore constriction increased the effective path length for diffusion through the composite membranes, which reduced both water and salt permeability identically. However, experimental salt permeability tended to decline to a greater extent than water permeability; hence, the observed changes in flux and rejection might also be related to structural changes in the polyamide thin film.

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“…The wear properties of dense NiTi SMAs have been extensively investigated in the last two decades . The alloys have better wear resistance than conventional metals including some steels, Ni‐ and Co‐based alloys, and titanium because the tribological performance of the latter materials depends on the mechanical properties such as hardness and work hardening, whereas the wear resistance of NiTi SMAs is believed to be determined by the stress or temperature‐induced superelastic behavior as well as martensitic plate reorientation .…”

Section: Introductionmentioning

confidence: 99%

“…Yan attributes the high wear resistance of NiTi to the combined effects of the small Young's modulus, low transformation stress, large recoverable transformation strain, and high‐plastic yield strength of the martensite phase. The effects of other factors such as small voids in the composites of TiC(N)/TiNi and surface coatings on NiTi on the wear properties have also been probed . Nonetheless, studies on the wear resistance of NiTi SMAs have hitherto only focused on dense materials and superelasticity.…”

Section: Introductionmentioning

confidence: 99%

Wear mechanism and tribological characteristics of porous NiTi shape memory alloy for bone scaffold

Liu

et al. 2013

J Biomedical Materials Res

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The abraded debris might cause osteocytic osteolysis on the interface between implants and bone tissues, thus inducing the subsequent mobilization of implants gradually and finally resulting in the failure of bone implants, which imposes restrictions on the applications of porous NiTi shape memory alloys (SMAs) scaffolds for bone tissue engineering. In this work, the effects of the annealing temperature, applied load, and porosity on the tribological behavior and wear resistance of three-dimensional porous NiTi SMA are investigated systematically. The porous structure and phase transformation during the exothermic process affect the tribological properties and wear mechanism significantly. In general, a larger porosity leads to better tribological resistance but sometimes, SMAs with small porosity possess better wear resistance than ones with higher porosity during the initial sliding stage. It can be ascribed to the better superelasticity of the former at the test temperature. The porous NiTi phase during the exothermic reaction also plays an important role in the wear resistance. Generally, porous NiTi has smaller friction coefficients under high loads due to stress-induced superelasticity. The wear mechanism is discussed based on plastic deformation and microcrack propagation.

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Influences of Porosity on Mechanical and Wear Performance of Pseudoelastic TiNi-Matrix Composites

Cited by 27 publications

References 10 publications

Tribological and thermal stability study of nanoporous amorphous boron carbide films prepared by pulsed plasma chemical vapor deposition

Tribological and thermal stability study of nanoporous amorphous boron carbide films prepared by pulsed plasma chemical vapor deposition

Using nanocomposite materials technology to understand and control reverse osmosis membrane compaction

Wear mechanism and tribological characteristics of porous NiTi shape memory alloy for bone scaffold

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