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The effect of the Al2O3 additive on the densification behavior, microstructure and mechanical properties of the B4C–xwt%Al2O3 composites sintered by means of spark plasma sintering (SPS) process were investigated.
The composite samples which with an addition of 4 wt% Al2O3 and sintering at 1750oC exhibits excellent mechanical properties (relative density: 98.82%, hardness: 90.6 HRA).
Introduction Boron carbide is an important special engineering ceramic material which has excellent physical and mechanical properties.
As a result of these improvements in density, the mechanical properties of B4C are enhanced remarkably.
These affects lead to enhancement in hardness.

TWB are defined as two or more steel sheets with same or different thicknesses, mechanical properties or surface coatings welded together by laser before stamping [4].
Vertical pressing mode(Fig.3) has advantage of good mechanical properties, But in order to avoid the space of welding unit, the leveling rollers will be made into little structure(Fig.3a) or hollow structure(Fig.3b), which is difficult to manufacture.
The mechanical properties of inclined pressing mode(Fig.4) is poor, but its structure is simple, so this mode is a good choice to automatic laser welding production line with integrated welding unit.
Factors influencing leveling force are shown in fig.5.
Fig.5 Factors influencing the leveling force Fig.6 Force analysis of blanks The force analysis of leveling mechanism is shown in Fig.6, according to the force equilibrium conditions, (1) Where = leveling force (N) = friction between blanks (N) = flexibility torque (N) = pressure (N) = pressing position (m) = suspension length (m) leveling force can be estimated by Eq. 1.

A detailed microstructural characterization has been done with relation to the mechanical properties.
The differences in mechanical properties can have various reasons.
As stated in literature [20] the block sizes are the dominant factor for mechanical properties and a good combination of toughness and strength.
As soon as the holding time at isothermal temperature is kept short, even small temperature variations do not affect the mechanical properties drastically, as seen within Fig. 6.
All those factors leading to favorable mechanical properties are beneficial for a reduction of processing time and energy.

steel, Thermal treatment, Sigma phase, Delta ferrite, Modeling/Experimental coupling, Mechanical properties.
For such applications, corrosion resistance and creep behaviour are main factors that have to be taken into account.
However, this kind of steel is sensitive to the nucleation and growth of brittle intermetallic phases during prolonged exposures at high temperature and especially to sigma (σ) phase [2,3,4]. s phase is mainly composed of iron and chromium and appears in the approximate range of 600-1000°C. s phase is known to affect the mechanical properties by reducing the ductility and the corrosion resistance of steels [5,6].
Thirdly, the influence of the phase on the mechanical properties of the steel was assessed by the achievement of tensile tests.
It means that the diffusion is the limiting factor of the s phase growth.

The influence from lubricating properties of piston ring has been specifically studied.
We analyzed the impact on the inner excitation from factors including lubricating oil, interface roughness, deformation of cylinder liner and piston skirt.
Fig. 3 Slap force under different impact factors The six curves in Fig. 3 denote six different scenarios.
It is found that with the increasing number of factors being considered in our model, the maximum slap force decreases.
Conclusions We established a theoretical model to describe the kinetic properties of the piston, which accounts for the piston’s secondary motion.

However there is still a poor combination of certain parameter to their response of mechanical properties such as the strength to load.
Among several factors affecting the compressive strength are parameters such as age of testing, binder type, binder amount, curing type and steel fiber volume fraction are the most influential [5].
The mechanical properties of the products are improved by utilizing the Taguchi optimization method.
Controllable factors such as melt temperature, packing pressure, injection time, and packing time are also considered as the optimal combination of factors in the manufacturing process [6].
Kamaruddin, Optimization of mechanical properties of recycled plastic products via optimal processing parameters using the Taguchi method, J.

Stress and stress concentration are one of the main factors of invalidating load-bearing structural members.
Introduction Stress and stress concentration are one of the main factors of invalidating load-bearing structural members.
For example, the test results of different equipment are very sensitive to the light source, light path, and even environmental factors.
Luminescence properties of different Eu sites in LiMgPO4:Eu2+, Eu3+[J].
Spectroscopic properties and energy level location of Eu2+ in Sr2Si5N8 phosphor[J].

It is well known that dislocation densities and grain size are important factors that enhance the elemental diffusion behavior [2].
This result indicates that compound layer (Ti2N) created by low temperature nitriding (600 oC) does not remarkably affect the fatigue properties of CP titanium.
Kawasaki, Factors controlling the fatigue strength of nitride titanium, Fatigue Fract.
Ameyama, New microstructure design for commercially pure titanium with outstanding mechanical properties by mechanical milling and hot roll sintering, Mater.
Saito, Effect of strain on microstructures and mechanical properties of ARB processed and annealed ultra-low carbon IF steel, Tetsu-to-Hagane 89 (2003) 273-280

It was found that small change in pyrolysis parameters significantly affected the carbon membrane properties.
Elisa Barbosa-Coutinho et al. [2] used polyetherimide hollow fiber to investigate the influence of pyrolysis parameters on the carbon membrane mechanical properties.
The obtained carbon membranes showed high separation factors for CO2/N2 and CO2/CH4.
Characterization of Membrane Properties.
Heat-treatment conditions strongly affected the properties of carbon membrane.

In addition，it has a great impact to mechanical motion properties and dynamic behavior in the practical application.
Fig.7 The relation curve of screw’s rotational speed and the fluctuation of friction moment Because lots of factors affect the value of friction moment of screw and tests’ data include many complex parameters, the influence of ball’s movement on friction moment was mainly analyzed.
As the ball screw structure is complex, each parameter changes will affect the impact properties of the screw, the impact of the ball on the screw is only considered here when it goes in and out the rollaway nest of inverter.
Experiment Study on Exciting Factors of Axial Vibration of Precision Ball Screw [J], Journal of Vibration, Measurement & Diagnosis, 2008, 28(1); 14-17
An Analysis of the Influence of Factors on Frictional Torque of Ball Screw [J], Journal of Southeast University, 1993 11