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The surface roughness influences the compactness, which is determined by the roughness of the surface, the surface grains were arranged more densely with decrease of roughness, by which the hardness of the films was enhanced.
In the spectra, six absorption bands were observed corresponding to wave numbers 612, 804, 1022, 1102, 1260, 1408 cm-1.

But in this case they destroy individual grains of the sintered material which definitively has to have a negative influence on the mechanical properties of the steel.
The cracks which were observed in this sample (Fig. 1 c) can be responsible for this accelerated wear, because a big number of craters produced as a result of brittle fractures within wear tracks were observed.

This phenomenon make the region near wellhole over acidification,limestone cave begin to take shape at the same time,most cementing material among sand grain was dissolved,if things go worse,it even may lead to formation sand flow.Although we resolve the problem of reaction speed,we also need to face another problem that these acids can not react with organic matter and even react with inorganic solid phase there is much limitations.So we need develop a certain special acid,which can achieve the purpose of comprehensive down.
(Project Numbers: 51174040) References [1] Zhengguo Wei, Changhui Bi, Lan Yu, Xiaoju Zhang, Zhenhua Zhang and Yong Yang: Study and application of comprehensive broken down technology with solid acid in Henan heavy oilfield[J],2005 (02)

and dolomite rock, with thickness of about 813m; Qingyan group (T2q), gray clay and calcareous clay rock in the upper part, and thin layer of limestone and argillaceous limestone in the lower part, with thickness of 868 to 1117m; Xinyuan group (T2x), clay rock and sandstone interbedded with thin and medium thick layers of limestone and marls, with thickness of 82 to 250m; Yangliujing group (T2y), composition of medium thick layer to massive dolomite, limestone and breccia dolomite, with thickness of 374 to 980m; Longtou group (T2l), medium thick layer to block crystalline limestones, algal limestone and biolistic limestone with a small amount of dolomite, with thickness 1158 to 1254m; Zuganpo group (T2z), made of thin to medium thick layer of limestone and nodular limestone, with thickness of 30 to 143m; Bianyang group (T2b), medium thick to thick layer of sandstone, thin to medium thick layer of siltstone, clay stone and a small amount of limestone composed of rhythmic alternation of grain
Well number was ZF03, with the hole depth of 159.00m.

According to 160/68A standard model, we designed 55cm long grain line skirt pattern, skirt size was given in Table 2.
Bottom contour S [Pixel] This parameter is mainly acquired by extracting pixel values of the bottom Wave number n [entries] Average peck radius [cm] Average trough radius [cm] Average peck angle [cm] Average trough angle [cm] Standard deviation of peck radius [cm] Standard deviation of trough radius [cm] Standard deviation of peck angle [degree] Standard deviation of trough angle [degree] Comparison parameter data of simulated skirts and real made skirts Table 4 a b c d e f Fig. 2 Comparison of simulated chiffon skirts and real made chiffon skirts.

The relationship between strength and porosity has been investigated by many researchers [8], and a number of models have been proposed to explain the strength-porosity behaviors.
Rice, Relation of tensile strength-porosity effects in ceramics to porosity dependence of Young's modulus and fracture energy, porosity character and grain size, Mater.

Such concentration of copper allows the precipitation of the maximum number of particles of the secondary phase Al2Cu ( q¢) after ageing.
Miura, et al., Grain refinement in aluminum alloy 2219 during ECAP at 250 °C, Mat.

When the same quality BaO was used to replace CaO, the mole number which O2- was brought into slag was decreased.
An analysis from the point of silicate precipitation, in the high temperature region, crystal nucleus was easy to form in liquid slag film, which was unfavorable to the grain growth.

A number of authors reported the synthesis of ferrimagnetic glass-ceramics in many systems, for example, SiO2-CaO-Fe2O3[6], SiO2-CaO-Fe2O3-B2O3-P2O5[7,8], SiO2-Na2O-CaO-P2O5-FeO-Fe2O3[9], CaO-P2O5-SiO2-MgO-MnO2-Fe2O3[10], SiO2-CaO-Fe2O3-ZnO[11], Li2O–MnO2–CaO–P2O5–SiO2[12].
For the crystal, the saturation magnetization increases with increasing crystal grain size, but the coercive force decreases[16].

As a result, the selection of a solid solution of a large number of dispersed carbides on the basis of the alloying components,ie is aging.
The microstructure of the hardened surface of the specimen is a fine-grained martensitic structure with dispersed insoluble inclusions of carbides and nitrides (Figure 2).