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The particle size distribution is more uniform and the grain has grown.
The authors thank the support of  Heilongjiang Natural Science Foundation of  China (B200503) and Harbin Special Fund for Science and Technology Innovation under the project number of 2009RFLXG008.

Table 1 Parameters of the tools materials Number Materials Components Density [g·cm-3] Grain Size [μm] Hardness [HRA] Bending Strength [MPa] Fracture Toughness [Mpa·m1/2] A Tungsten Carbide 94%WC+6%Co 14.6 2.10 89.5 1420 10.5 B Al2O3-Ceramics 99%Al2O3 3.99 0.59 96 820 4.6 C Al2O3-Ceramics with ZrO2 90%Al2O3+10%ZrO2 4.10 0.53 95 835 4.9 D Si3N4-Ceramics 99%Si3N4 3.19 0.45 93 950 5.7 Methods.

The raw materials were milled to obtain a fine-grained particle size distribution.
The number of samples at each test was eight.

Experimental Procedures The workpiece material used for experiments was Inconel 718 (10 mm in thickness) and ground to parallel faces with a diamond-grain resin-bond grinding wheel.
The S/N ratio of the smaller the better characteristic can be expressed as ∑=−= n i i S y n �S 1 21 log10)/( (1) where n is the number of repetitions of the experiment and iy is the average measured value of the experimental data i.

Mining coal seam roof and floor condition: direct roof is 17 ~ 21m with silty mudstones and dark grey, shale structure and massive tectonic, brittle, local containing vegetable root fossils, unidirectional compressive strength 13.2 ~ 17.3 MPa, the coal seam average 5.1 m , the above layered average 2.4 m, the below layered average 2.3 m, unidirectional compressive strength 10.1 MPa, intermediate 0.6 m mudstone clip bottles; pseudo bottom 1.4 m mudstone, black, brittle, unidirectional compressive strength 4.2 ~ 9.7 MPa, direct bottom 2.0 m, fine-grained sandstone, dark grey, calcium cementation, more hard, Basic bottom 5.0 m mudstone, black, denser, lump, unidirectional compressive strength 8.7 MPa, belongs to the typical "three soft" strata according to observation in the region, and its surrounding rock loose circle is 2.2 m, large loose circle V class, very soft rock.
It depends on the size of the working pressure of pumping stations (30MPa), pillar number and the column cylinder lumen.

The finished roughcast should be checked as the following before being accepted: 1)the roughcasts must be forged by hydraulic press with the total forging ratio no smaller than 4; 2)the Austenite grain size must be equal or over 5, according to GB/T6394; 3)there must be at least one forging with an extra length of 250mm from the same furnace No. for the purpose of the demander's retest; 4)after the process of annealing or normalizing and high-temperature tempering, the forging’s hardness HB must be no more than 240; 5)such defects as crack, mezzanine, fold and forging injury are not allowed on the surface of the forging after rough process; 6)from the surface to as deep as 80mm, no defects with a diameter longer than 2mm are allowed, nor the suggestion of length extension; 7)apart from the range mentioned in 6), extensive and continuous defects are not allowed in the center part of the forging. 2.2 Introduction of the key manufacture of machining During the research and trial-producing
This lathe clamping is mainly made up of plug, bolt, eccentric sleeve and taper pin, numbered respectively 1, 2, 4 and 5.

Introduction In recent years, because of a number of good service properties such as excellent wear resistance, heat resistance, large neutron capture cross section and corrosion resistance, much attention is paid to high boron white cast iron, which is used as a new wear-resistant materials [1-3], nuclear power generation materials [4] and corrosion resistant materials in liquid zinc [5].
The crack propagation along the grains will cause the cleavage fracture to appear.

Pulse electric field can refine crystal grain and increase the number of equiaxed crystal to different degree by these two techniques.

Thus, the initial reduction of Rsh is not related with interdiffusion processes, and may be explained by a decrease of the grain boundary density after recrystallization of Au layer.
However, after RTA at 800 o C the formation of small number of pores is observed (Fig. 4c).

Makar et al [4] tried to distribute CNT bundles across cement grains, and characterized the interaction between CNT and hydrated product in 2004.
As known, the main factors affecting the conductivity of composites are the contact resistance and the number of conductive netlike pathways.