Analysis of Tribological Processes in Components of Massive Roller Bearings

2015 ◽  
Vol 220-221 ◽  
pp. 319-323
Author(s):  
Wojciech Napadłek
Keyword(s):  
Surface Layer ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Contact Surface ◽  
Laboratory Tests ◽  
Fiber Optic ◽  
Bearing Steel ◽  
Roller Bearings ◽  
Special Software ◽  
Scanning Electron

The paper presents an analysis of tribological processes on the surface layer of large roller bearings parts carried out on bearing steel 100CrMn6. Laboratory tests carried out on roller bearings elements eg. the axle railway wagons exploitation around 600 thousand km. Modern optical microscopy with fiber optic transmission and special software was used; scanning electron microscope was applied to analyze surface stereometry; profilometers made an analyze of seizure of co-working tribological parts: roller – race roller bearings. In addition, the documentation of characteristic tribological processes occurring during the exploitation the bearings was completed. Seizure zones contact surface which occur under high and variable loads and friction were found.

Laboratory Tests on the Improvement of Strength of Silt Using Microbes

2012 ◽  
Vol 166-169 ◽  
pp. 1620-1625
Author(s):  
Zhao Yang Xu ◽  
Shao Jin Wan ◽  
Yao Ren Ma
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Compression Test ◽  
Laboratory Tests ◽  
Triaxial Compression ◽  
Energy Dispersive ◽  
X Ray ◽  
Metabolic Outcomes ◽  
Before And After ◽  
Scanning Electron

Microbe technology is introduced for improving silt The metabolic outcomes and precipitation of microbes can glue the soil granule,plug mineral lattice crystal,simultaneously strengthen their shear resistance.Characteristics of silt before and after modification are compared by CU triaxial compression test. By Scanning Electron Microscope(ESEM) and Energy Dispersive X-ray(EDX),the modification mechanism of silt has been investigated.The results show that the values φ of silt is increased larger modified by carbonate mineralization microbes, while the value of cohesion increases larger by polysaccharides viscose microbes.

Ceramic flaws: Laboratory tests and analysis using Scanning Electron Microscope to identify surface defects

2014 ◽  
Vol 34 (11) ◽  
pp. 2655-2662 ◽  
Author(s):  
M. Carlini ◽  
S. Castellucci ◽  
E. Allegrini ◽  
B. Giannone ◽  
S. Ferrelli ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Laboratory Tests ◽  
Surface Defects ◽  
Scanning Electron

Bacteriocin plasmid pMB1 of Enterococcus faecalis: identification of the cell aggregation substance after induction by sex pheromone

1994 ◽  
Vol 40 (6) ◽  
pp. 500-503 ◽  
Author(s):  
R. Quirantes ◽  
I. Martín ◽  
E. Valdivia ◽  
A. Gálvez ◽  
M. Martínez-Bueno ◽  
...  
Keyword(s):  
Surface Layer ◽  
Electron Microscope ◽  
Sex Pheromone ◽  
Scanning Electron Microscope ◽  
Enterococcus Faecalis ◽  
Cell Aggregation ◽  
Surface Proteins ◽  
Aggregation Substance ◽  
Culture Supernatants ◽  
Scanning Electron

Strains of Enterococcus faecalis carrying the bacteriocinogenic plasmids pMB1 or pMB 1.1 exhibit a clumping response to culture supernatants of different enterococcal strains. Antibodies raised against cells induced by a homologous pheromone recognize two surface proteins of 152 and 72.5 kDa (the second one is possibly the degradation product of the first), respectively. These antigens are very similar to those found in induced cells of E. faecalis OGIRF(pAM211) as shown by the cross-reaction of the immune sera obtained in this work. We propose that the 152-kDa protein corresponds to the aggregation substance coded by plasmids pMB1 and pMB1.1. Moreover, antibodies raised against induced cells are able to block the pheromone-induced clumping response. When the cells induced to form aggregates by pheromones were examined under a scanning electron microscope they showed a surface layer of hairlike structures.Key words: pMB1 plasmid, sex pheromone, aggregation substance, Enterococcus faecalis.

Microstructure of Hard Magnetic FeCr22Co15 Alloy Subjected to Tension Combined with Torsion at High Temperatures

2013 ◽  
Vol 203-204 ◽  
pp. 284-287 ◽  
Author(s):  
Anna Korneva ◽  
Galija Korznikova ◽  
Rishat Kashaev ◽  
Krzysztof Sztwiertnia
Keyword(s):  
Surface Layer ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Longitudinal Section ◽  
Maximum Amount ◽  
Σ Phase ◽  
Gradient Microstructure ◽  
Weak Gradient ◽  
Co Alloys ◽  
Scanning Electron

The paper presents the results of microstructure evolution studies of hard magnetic FeCr22Co15 alloy, destructed by tension and torsion at 800 and 850°C. The temperatures and deformation rates corresponded to the condition of superplasticity of Fe-Cr-Co alloys. Observations of longitudinal section of deformed samples in scanning electron microscope showed a formation of weak gradient microstructure with highest grain refinement in the surface layer of material. Precipitation of intermetallic σ-phase was also observed, with its maximum amount in zones of the highest deformation.

Correlation between the Morphology and Permeability of Liquid Crystalline Polymer/Polyethersulphone Blends

1992 ◽  
Vol 4 (1) ◽  
pp. 3-12 ◽  
Author(s):  
S. G. James ◽  
A. M. Donald ◽  
I. S. Miles ◽  
W. A. Macdonald
Keyword(s):  
Surface Layer ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Thin Surface Layer ◽  
Dimethyl Formamide ◽  
Hydroxybenzoic Acid ◽  
Scanning Electron

Blends of polyethersulphone (PES) and a thermotropic copolyester based on hydroxynaphthoic acid and hydroxybenzoic acid residues have been examined. The permeability to oxygen of thin pressed films of a range of compositions has been studied. It is found that fairly modest additions of the liquid crystalline polymer (LCP) lead to a pronounced improvement in barer properties. This improvement is ascribed to the formation of a thin surface layer of the LCP. The existence of this LCP surface layer is supported by examination in the scanning electron microscope of dimethyl formamide etched samples: etching does not remove all the PES because it is protected from the etchant by the surface layer.

Laser Composite Surfacing of a Magnesium Alloy with TiO2 Nanoparticles

2012 ◽  
Vol 549 ◽  
pp. 643-646 ◽  
Author(s):  
Min Zhang ◽  
Chang Jun Chen ◽  
Qun Xing Fei
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Electron Microscope ◽  
Magnesium Alloy ◽  
Scanning Electron Microscope ◽  
Cross Section ◽  
Composite Layer ◽  
Matrix Interface ◽  
Composite Surface ◽  
Scanning Electron

In the study, ZM5 Mg alloy was laser melted by dispersion of TiO2nanoparticles on its surface. The microstructure of the composite surfaced layer (both the top surface and the cross section) was characterized by optical and scanning electron microscope. A detailed analysis of the composition of the composite layer was carried out by energy dispersive spectroscopy. The microhardness of the composite layer was measured and the wear of the composite surfaced ZM5 was studied. Experimental results showed that composite surface layer consists of TiO2particles in grain refined ZM5 matrix, but the nanoparticles was agglomerated. And there was degradation of TiO2particles or interfacial reaction at the particle-matrix interface. Microhardness and wear resistance of the composite surfaced zone was improved compared to ZM5 substrate.

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