Search results

The grain size of the ironstone was 1.7 mm~3.3 mm, and its microhardness was 550～630Hv.
As a result, on one hand, the abrasive particles push the tested material to the sides of the furrow to form plastic deformed ridges; on the other hand, and the material which was pushed to the frontage of the furrow formed plastic deformed wedges.With the increment of the number of furrow, the more and more materials were accumulated at the local area.

The solar irradiance, collector area, flow rate of hot dry air, heat transfer coefficient, number of system cover, radiative properties of collector and its cover were among the factors used in system thermal prediction as shown in Fig. 4.
Cenkowski, Grain Drying.

Despite the large multi-axis CNC gantry high-speed mobile drilling has many advantages mentioned above, however, because the device is a recent development with a large span beam processing equipment, often in high-speed milling process occurs bed of static / dynamic stiffness enough beds Instability of body vibration occurs, rough initial residual stress, the process of mechanical load and thermal load, the deformation and damage cutting tools, reducing the accuracy of drilling, drilling surrounding tissue uneven grain, milling and other difficult to remove debris Problem.
Foreign scholars since the 20th century that began 70 years the finite element method is applied to simulate the cutting process, and achieved certain results, for ordinary bed design and optimization of the structure of a large number of studies have been abroad for reference, and large span gantry Drill press bed design and optimization of the structure is urgently needed to resolve the problem.

At the co-action of surface contact with stress and friction, the wear interface of experimental alloy performed a large plastic deformation; rheology was happened to the cracked grain along rolling, and the subsurface of experimental alloy formed deformation layer.
Hypereutectic Al-Si alloy wear resistance not only affect by primary silicon number, size, shape but also by the morphology of eutectic silicon.

Table1 The soil indexes of Pingyang mud Basic indicators of soil Composition of grains Average particle size Water content Density Liquid limit Plastic limit Plasticity index Density of soil particles Powder Cosmids Colloidal Wet Dry 0.075~ 0.005 mm 0.005~ 0.002 mm < 0.002 mm ω ρ ρd ωl ωp Ip Gs - - - d50 % g/cm3 g/cm3 % % - - % % % mm 65.0 1.59 0.91 61.2 29.6 31.6 2.75 52.4 22.6 25.0 0.0055 Table 2 The content of major ions of Pingyang seawater PH K+ Na+ Ca²+ Mg²+ HCO3- SO4²- Cl- NO3- Free CO2 Content of insoluble solids mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L 7.73 238 6930 243 716 147 1531 11792 18.8 1.85 21616 2.2 Sedimentation test equipment The formulation of mud was done in 1000ml beaker. the mud mixings were done by a electric mixer which can be stepless variable speed, and duration of the mud mixings was 5 minutes with mixing head of two butterfly-shaped. the sedimentation was done in 1000ml graduated cylinder, which has a bottom area
At this paper, the two methods are compared. 2,Main points of mud mixing In the test, the water content of formulated mud is 500%, and the formulation of mud and the number of mixing were used by the following process.

Although a number of efforts have been made to prepare TiO2 nanotube arrays, magnetically doped TiO2 nanotube arrays have been reported rarely, which may be more promising for practical applications.
Most particles were between 10 ~ 15nm in diameterand, and most grains were reunited.

The homogeneous and uniform microstructures were observed for both surface and fracture surface of Li2TiO3 ceramic pebbles, and the average grain size is about 5mm.
However, a number of open pores with interconnected paths in pebbles body can be also observed, and the average diameter of those pores is about 2mm.

It is limited by the number of tetravalent titanium ions, but not the octahedral or tetrahedral sites to accommodate lithium ions in the voltage range of 2.5 to 0.01V, corresponding to 293 mAhg-1, but not 175mAhg-1[2].
The scanning electron microscope (SEM) was used to observe the grain morphology and particle size.

Introduction Some of the major driving forces for the development of Al-Si cast alloys are the superior wear resistance, low coefficient of thermal expansion (CTE), high corrosion resistance, high strength to weight ratio, low cost and excellent castability which makes them potential candidate materials for a number of tribological applications in automobiles and another engineering sectors [1-5].
Development of an efficient grain refiner for Al-7Si alloy and its modification with strontium.

From the curve, we can see number of cycles descending fast while loading stress is 608~650MPa.
When it spreads to the middle area, the shear stress was becoming small gradually, and holding function of grain boundary grew obvious, which made fracture relatively rough (as shown in figure 6), it resulted in closing effect which slowed down the crack spreading rate.