Effect of TiB2 particle size on the material transfer behaviour of Cu–TiB2 composites

2020 ◽  
Vol 36 (15) ◽  
pp. 1685-1694
Author(s):  
Xiuhua Guo ◽  
Kexing Song ◽  
Wang Xu ◽  
Guohui Li ◽  
Zaoli Zhang
Keyword(s):  
Particle Size ◽  
Tib2 Particle ◽  
Material Transfer

Effect of Microwave Irradiation on the Flow of Micro-Particle Suspension (TiO2/H2O) in Micro-Scale Porous Structure

2009 ◽  
Author(s):  
Qianqian Di ◽  
Junhong Yang ◽  
Mingdi Sun ◽  
Liqiu Wang
Keyword(s):  
Particle Size ◽  
Microwave Irradiation ◽  
Porous Structure ◽  
Membrane Separation ◽  
Porous Membrane ◽  
Particle Suspension ◽  
Material Transfer ◽  
Volume Percentage ◽  
Microwave Assisted ◽  
Average Size

The mass flow and transport phenomenon in porous media widely exists in nature and engineering applications. Membrane separation is a typical material transfer process in the porous medium. The objective of the present study is to estimate the effect of microwave irradiation on transport of micro-particle suspension through porous structure, using the flowing of TiO2/H2O micro particle suspension through 0.45μm mixed cellulose micro porous membrane as an example. The work mainly compared the filtration behavior of suspension through membranes during microwave assisted filtration and conventional filtration. The particle size distribution of suspension was also characterized by using laser particle size analyzer. As the results, it is measured that the processed volume of suspension during microwave assisted filtration is considerable higher than that during conventional filtration. It is also observed that the average size of particles in suspension is 3.80 μm (10 g/L), and the volume percentage of particles smaller than micro-pore size 0.45μm in micro-filtration membrane is about 11.5%. It is indicated that microwave assisted filtration could considerably enhance the processed volume of suspension with micro-particle, which might be able to give some inspiration to the optimization of some processed technology of suspension chemical industry, food industry and water treatment industry.

Effect of TiB2 Particle Size on Erosion Behavior of Ag-4wt% TiB2 Composite

2015 ◽  
Vol 44 (11) ◽  
pp. 2612-2617 ◽  
Author(s):  
Wang Xianhui ◽  
Yang Hao ◽  
Liang Shuhua ◽  
Liu Mabao ◽  
Liu Qida
Keyword(s):  
Particle Size ◽  
Tib2 Particle ◽  
Erosion Behavior

Effects of TiB2 particle size on the microstructure and mechanical properties of TiB2-based composites

2019 ◽  
Vol 45 (1) ◽  
pp. 1370-1378 ◽  
Author(s):  
Ning Wu ◽  
Fengdan Xue ◽  
Hailin Yang ◽  
Guoping Li ◽  
Fenghua Luo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Tib2 Particle ◽  
Microstructure And Mechanical Properties

Microstructure Control of Ceramic-Intermetallic Composites by Heat-Treatment before Combustion Synthesis

2007 ◽  
Vol 561-565 ◽  
pp. 769-772 ◽  
Author(s):  
Kiyotaka Matsuura ◽  
Kenichi Ohsasa ◽  
Yuki Obara
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Combustion Synthesis ◽  
Volume Fraction ◽  
Formation Enthalpy ◽  
Tib2 Particle ◽  
Adiabatic Temperature ◽  
Partial Reaction ◽  
Temperature And Pressure ◽  
Large Formation

When mixtures of Fe, Al, Ti and B powders were heated, the combustion synthesis, or SHS, reaction occurred and produced a TiB2 particle dispersed FeAl-based composite. The TiB2 particle size increased with increasing TiB2 volume fraction from 0.3 to 0.8, which was considered to be due to the fact that the adiabatic temperature of the reaction increases with the increase in TiB2 concentration in the composite due to the large formation enthalpy of TiB2. The TiB2 particle size decreased with increasing preheating time, temperature and pressure before the SHS reaction. It was suggested that partial reaction between elemental powders before the SHS reaction reduced the adiabatic temperature and hence the TiB2 particle size. The Vickers hardness of the composite varied from 500 to 2000 depending on the microstructure. This method was applied to the production of TiC-FeAl, TiC-Fe, TiB2-Fe composites.

Microstructural characterization of laser-melted/roller-quenched dicalcium silicate

1988 ◽  
Vol 46 ◽  
pp. 582-583
Author(s):  
C. J. Chan ◽  
K. R. Venkatachari ◽  
W. M. Kriven ◽  
J. F. Young
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Shape Change ◽  
Microstructural Characterization ◽  
Particle Size Effect ◽  
Dicalcium Silicate ◽  
Laser Melting ◽  
Uniform Size ◽  
Cell Shape Change ◽  
Wide Range

Dicalcium silicate (Ca2SiO4) is a major component of Portland cement. It has also been investigated as a potential transformation toughener alternative to zirconia. It has five polymorphs: α, α'H, α'L, β and γ. Of interest is the β-to-γ transformation on cooling at about 490°C. This transformation, accompanied by a 12% volume increase and a 4.6° unit cell shape change, is analogous to the tetragonal-to-monoclinic transformation in zirconia. Due to the processing methods used, previous studies into the particle size effect were limited by a wide range of particle size distribution. In an attempt to obtain a more uniform size, a fast quench rate involving a laser-melting/roller-quenching technique was investigated.The laser-melting/roller-quenching experiment used precompacted bars of stoichiometric γ-Ca2SiO4 powder, which were synthesized from AR grade CaCO3 and SiO2xH2O. The raw materials were mixed by conventional ceramic processing techniques, and sintered at 1450°C. The dusted γ-Ca2SiO4 powder was uniaxially pressed into 0.4 cm x 0.4 cm x 4 cm bars under 34 MPa and cold isostatically pressed under 172 MPa. The γ-Ca2SiO4 bars were melted by a 10 KW-CO2 laser.

Analytical Electron Microscopy study of two vehicle-aged automotive exhaust catalysts having dissimilar activities

1989 ◽  
Vol 47 ◽  
pp. 272-273
Author(s):  
Sooho Kim ◽  
M. J. D’Aniello
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Noble Metal ◽  
Catalyst Deactivation ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Metal Particles ◽  
Automotive Exhaust ◽  
Exhaust Catalysts ◽  
Analytical Electron

Automotive catalysts generally lose-agtivity during vehicle operation due to several well-known deactivation mechanisms. To gain a more fundamental understanding of catalyst deactivation, the microscopic details of fresh and vehicle-aged commercial pelleted automotive exhaust catalysts containing Pt, Pd and Rh were studied by employing Analytical Electron Microscopy (AEM). Two different vehicle-aged samples containing similar poison levels but having different catalytic activities (denoted better and poorer) were selected for this study.The general microstructure of the supports and the noble metal particles of the two catalysts looks similar; the noble metal particles were generally found to be spherical and often faceted. However, the average noble metal particle size on the poorer catalyst (21 nm) was larger than that on the better catalyst (16 nm). These sizes represent a significant increase over that found on the fresh catalyst (8 nm). The activity of these catalysts decreases as the observed particle size increases.

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