Analysis of mechanical properties of large particles in contact process and their impact on powder lubrication

2015 ◽  
Vol 9 (2) ◽  
pp. 99-104 ◽  
Author(s):  
W. B. Wang ◽  
W. Wang ◽  
K. Liu
Keyword(s):  
Mechanical Properties ◽  
Contact Process ◽  
Large Particles ◽  
Powder Lubrication

Selective DNA attachment of micro- and nanoscale particles to substrates

2002 ◽  
Vol 17 (2) ◽  
pp. 473-478 ◽  
Author(s):  
D. M. Hartmann ◽  
M. Heller ◽  
S. C. Esener ◽  
D. Schwartz ◽  
G. Tu
Keyword(s):  
Mechanical Properties ◽  
Solid Supports ◽  
Particulate Materials ◽  
Nanoscale Particles ◽  
Large Particles ◽  
Dna Strands ◽  
Dna Attachment

Materials formed from micro- and nanoscale particles are of interest because they often exhibit novel optical, electrical, magnetic, chemical, or mechanical properties. In this work, a means of constructing particulate materials using DNA strands to selectively attach micro- and nanoparticles to substrates was demonstrated. Unlike previous schemes, the DNA was anchored covalently to the particles and substrates, rather than through protein intermediaries. Highly reproducible selective attachment of 0.11–0.87 mm-diameter particles was achieved, with selective:nonselective binding ratios >20:1. Calculations showed that at most 350 and 4200 DNA strands were involved in the binding of the small and large particles, respectively. Experiments showed that the DNA was bent at an angle, relative to the surfaces of their solid supports.

scholarly journals Optimization of a Solution Treatment in the Al-Cu-Mg-Ag Alloy via a Microstructural Investigation

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 66
Author(s):  
Hyeongsub So ◽  
Jae-Hong Shin ◽  
Leeseung Kang ◽  
Chanuk Jeong ◽  
Kyou-Hyun Kim
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Grain Growth ◽  
Microstructural Evolution ◽  
Precipitation Hardening ◽  
Solution Treatment ◽  
Solution Temperature ◽  
Al Alloy ◽  
Microstructural Investigation ◽  
Large Particles

We investigated the effect of solution temperature (Tsol. = 440–530 °C) on the mechanical properties of the Al–3.4Cu–0.34Mg–0.3Mn–0.17Ag alloy, finding that the investigated Al alloy showed the highest mechanical strength of σUTS = ~329 MPa at a Tsol. value of 470 °C. The microstructural investigation demonstrates that the mechanical properties for different Tsol. values stem from grain growth, precipitation hardening, and the formation of large particles at the grain boundaries. On the basis of Tsol. = 470 °C, the effect of each microstructural evolution is significantly different on the mechanical properties. In this study, the relationships between the microstructural evolution and the mechanical properties were investigated with respect to different values of Tsol.

DISPERSION AND MECHANICAL PROPERTIES OF CERIUM OXIDE FILLED INTO RUBBER COMPOSITES

2014 ◽  
Vol 87 (2) ◽  
pp. 340-347 ◽  
Author(s):  
Zhaogang Liu ◽  
Mei Li ◽  
Yanhong Hu ◽  
Hai Fu ◽  
Mitang Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cerium Oxide ◽  
Rubber Matrix ◽  
X Ray Diffraction ◽  
Small Particles ◽  
Rubber Composites ◽  
X Ray ◽  
Large Particles ◽  
Better Than ◽  
Properties Of Composites

ABSTRACT Rubber composites were synthesized by natural rubber filled with cerium oxide with different particle diameters. The dispersion morphology of cerium oxide in rubber matrix and the mechanical properties of composites were studied, and the contrast experiment of reinforcing rubber with cerium oxide was performed. The results showed that the small particles of cerium oxide had better disparity than the large particles of cerium oxide in NR. The mechanical properties of rubber filled with small particles of cerium oxide were better than those of rubber filled with large particles of cerium oxide. The crystalline rubber was measured by X-ray diffraction, which indicated that the CeO2 accelerated crystallization capacity and confined the rubber chain movement. The tensile strength of rubber was increased by this confinement.

Simulation of Surface Contact Process and Study of Friction and Wear Mechanisms

2012 ◽  
Vol 562-564 ◽  
pp. 540-543
Author(s):  
Yu Jin Fan ◽  
Zhe Kun Li ◽  
Jian Xiong Liu
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Contact Pressure ◽  
Contact Surface ◽  
Surface Deformation ◽  
Contact Region ◽  
Contact Process ◽  
Surface Shape ◽  
Surface Contact ◽  
Adhesion Effect

In the paper the process of a rigid particle penetrating into thermal refining steel and sliding on the surface is simulated by finite element method, the plough effect of sliding on contact surface and the adhesion effect of adhering to contact surface have be investigated. The apparent plastic flow and the material deposit are observed in the contact region, and the surface shape and the contact pressure distribution are obviously changed, the result of simulation is that surface deformation, contact pressure and friction shearing stress of contact surface depend on material mechanical properties, surface geometrical shapes and surface contact states. The mechanisms of plough effect and adhesion effect in friction are also studied, it is show that the mechanisms of adhesion effect and plough effect are different, plough effect is mainly crushing the surface layer in contact region, affected by material mechanical properties and surface shapes, and adhesion effect is mainly tearing the surface layer, affected by surface contact states.

Microstructure and Mechanical Properties of a Single Crystal NiAl Alloy with Zr or HF Rich G-Phase Precipitates.

1990 ◽  
Vol 213 ◽  
Author(s):  
I. E. Locci ◽  
R. D. Noebe ◽  
R. R. Bowman ◽  
R. V. Miner ◽  
M. V. Nathal ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Single Crystals ◽  
Heat Treatments ◽  
Strengthening Effect ◽  
Slow Cooling ◽  
Large Plate ◽  
Nial Alloy ◽  
Large Particles ◽  
The Matrix

ABSTRACTThe possibility of producing NiAl reinforced with the G-phase (Ni16X6Si7), where X is Zr or Hf, has been investigated. The microstructures of these NiAl alloys have been characterized in the as-cast and annealed conditions. The G-phases are present as fine cuboidal precipitates (10 to 40 nm) and have lattice parameters almost four times that of NiAl. They are coherent with the matrix and fairly resistant to coarsening during annealing heat treatments. Segregation and non-uniform precipitate distribution observed in as-cast materials were eliminated by homogenization at temperatures near 1600 K. Slow cooling from these temperatures resulted in large plate shaped precipitates, denuded zones, and a loss of coherency in some of the large particles. Faster cooling produced a homogeneous fine distribution of cuboidal G-phase particles (≤10 nm) in the matrix. Preliminary mechanical properties for the Zr-doped alloy are presented and compared to binary single crystal NiAl. The presence of these precipitates appears to have an important strengthening effect at temperatures≥1000 K compared to binary NiAl single crystals.

Effect of Aging Condition on the Mechanical Properties of an Al-Cu-Mg-Ag Alloy

2012 ◽  
Vol 476-478 ◽  
pp. 42-45 ◽  
Author(s):  
Yan Xia Gu ◽  
Zhi Yi Liu ◽  
Di Er Yu ◽  
Xuan Wei Zhou ◽  
Qian Qian Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Room Temperature ◽  
Average Particle Size ◽  
Average Particle ◽  
Small Particles ◽  
Aging Condition ◽  
Elevated Temperature Tensile ◽  
Exposure Temperature ◽  
Large Particles

The effect of aging condition on elevated temperature tensile strength and microstructure of an Al-Cu-Mg-Ag alloy was investigated. The tensile strength of 165°C/14h samples was greater at room temperature and 200°C, while the 165°C/2h samples got superior tensile properties at 250°C and 300°C. The microstructure contained mainly of Ω plates in both conditions, and as the increasing of exposure temperature, the coarsening of Ω precipitates occurred by the solution of small particles and the growth of large particles, resulting in an increase in the average particle size, and the decrease in the number of precipitates.

Investigation of Bimodal Particles Based Magnetorheological Elastomers

2008 ◽  
Vol 32 ◽  
pp. 165-168 ◽  
Author(s):  
Xian Zhou Zhang ◽  
Wei Hua Li
Keyword(s):  
Mechanical Properties ◽  
Large Particle ◽  
Experimental Results ◽  
Particle Analysis ◽  
Magnetorheological Elastomers ◽  
Large Particles ◽  
Particle Ratio ◽  
Mr Effect ◽  
Specific Particle

This paper presents the study of rheological and mechanical properties of MR elastomers fabricated using small and large particle. Analysis indicated that MR elastomers fabricated with bimodal particles at a specific particle ratio ingredient show enhanced MR effect compared with those fabricated with monoparticles. MR elastomer samples were fabricated by using small and large particles with sizes of 5m and 50m respectively. Their rheological and mechanical properties were characterized with a MR rheometer. Experimental results agree well with the analysis.

Mechanical Properties of Microwave Sintered 60YSZ-Al2O3/10HAP Bioceramics Composites

2014 ◽  
Vol 627 ◽  
pp. 18-23
Author(s):  
M.R.N. Liyana ◽  
Nur Maizatul Shima Adzali ◽  
W. Rahman ◽  
M.Z.M. Zamzuri ◽  
Harun Azmi
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Microwave Heating ◽  
Sintering Temperature ◽  
Biomedical Application ◽  
Xrd Analysis ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Processing Times ◽  
Large Particles

Microwave heating technology promising shorter processing times and less energy consumption beneficial for economic perspective with improved properties and better microstructural control. This study focussed on microwave sintered bioceramics material of 60YSZ-Al2O3/10HAP mixture fabricated by powder metallurgy route. The study was conducted based on three different sintering temperatures, starting with 900 °C, 1000°C ended with 1100°C. Mechanical properties of materials such as porosity, density, hardness and compressive strength were then determined for each composites. Results showed that lowest porosity was obtained at 1000°C which promoting to higher density, hardness and compressive strength. However, the increasing sintering temperature up to 1100 °C was initiated the decomposition of HAP and constitutes the formation of CaZrO3determined by X-ray Diffraction (XRD) analysis. Microstructure characterization by Scanning Electron Microscope (SEM) observed the growth of large particles and pores result in excessive grain coarsening. Better sinterability was achieved through an adequate sintering temperature of 1000°C with no reaction reported between HA and ZrO2during the sintering process facilitate by microwave hybrid heating. The pores was found to be interconnected for each composites via microwave heating expected to be useful for biomedical application which was favorable to osteo-integration.

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