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Fig.2 (a) showed the main morphologies of the Fe2O3 nanoparticles without doping were polygonal grain with regular shape, uniformly.
While, in the Fig.3 (c) (d), we can find a large number of rhombus too, but there were few boundaries between small particles.

The reason is that the undeformed chip average thickness of single grain decreases with wheel speed increasing while the number of effective abrasive increasing, as well as the plastic deformation depth decreases accordingly.

Due to the high strength and wear resistance of the D6AC steel [4, 5] a number of the mining equipment manufacturers use the steel under consideration as a material for producing drill bits, casings, bearings instead of the conventional case-hardening steels [6, 7].
Lee, Effect of austenite grain size on the transformation kinetics of upper and lower bainite in a low-alloy steel, Scr.

Generally, the chemical formula of these compounds is (Bi2O2) +2(Am-1BmO3m+1) 2, where A is a combination of one or more mono-, di-and trivalent ions, B is a combination of tetra-, penta- and hexavalent ions, and m is the number of perovskite layers in each unit.
XRD diffraction confirmed that the sample is a single phase of the bismuth- oxide-layer-type structure with m = 4 and has no certain grain orientation.

This is because of the formation of TiC particles agglomerates at grain boundaries [12].
It could be seen that the number of dimples and plastic deformation gradually reduced with the cooling rate increased.

Currently, there are 14 raw material medicine production approval numbers for dipyrone production and 12 manufacturers, including Shandong XinHua pharmaceutical factory, Hebei Ji Heng Group Pharmaceutical Co., Ltd., Wuhan Department Store drug Pharmaceutical Co., td., Shanghai Wuzhou Pharmaceutical Co., Ltd..
The grain size of the product is small, color is not qualified

There were a large number of literature studies about the expansion mechanism of expandable graphite[3].The interlayer compounds of expandable graphite would be decomposed rapidly at high temperature, then a large amount of gas was produced.
The particle size of expandable graphite were selected by the sifters which mesh are 50,100,200 and 300mesh, so the grain diameter are 0.15-0.30mm, 0.075-0.15mm, 0.053-0.075mm, and the materials made up with those were called M50, M100, M200.

It strengthens the binding among coal grains so that the compressive strength of formed coke is raised highly.
The particle size of pulverized coal are divided into five levels: <0.28mm; 0.28-0.63mm; 0.63-1.25mm; 1.25-2.5mm; 2.5-5.0mm，which in turn number 1~5.

The 18 mm × 5 mm faces were aluminized by the process described above, while the other faces were polished using abrasive paper with #800 grain.
Numbered white circles in Fig.2a indicate measurement points of EDS analysis.

For nylon powder grain, the best spreading thickness is 0.15mm.
It can be found that a great number of small inorganic fillers are abnormally distributed around the big nylon particles, because the particle size of inorganic fillers is small, which makes the specific surface area of powder materials increase, leading to the increasing of the contact area between particles and substrates.