Advanced Materials Research Vol. 676

Abstract: Through testing the mechanical properties and electrical property, the conductive aluminum alloy with high strength and elongation was obtained by adjusting the content of Fe, B and misch metal elements constantly, and the influence mechanism of the add elements was discussed by observing microstructure morphology of the aluminum alloy. The results indicated that the addition of Fe could effectively improve the tensile strength of commercial aluminum, while the addition of misch metal could change the existence form of Fe, thus to compensating for the decrease of elongation because of the addition of Fe. On the other hand, the addition of appropriate B could remove the harmful impurity elements of the aluminum alloy and refining the grain, so as to reduce the resistivity of the aluminum alloy with adding iron and rare earth elements. Finally, the optimum was obtained which was the composition of 99.18%Al-0.75%Fe-0.05%Re-0.02%B, the tensile strength was 103MPa, the elongation was 30.98% and the resistivity was 2.737×10-8Ω•m.

Abstract: Abstract. Mobility is one of the most important properties of semiconductor material, and it has a great impact on the property of MOS devices.In this paper, the influence of ionizing impurity scattering, acoustic phonon scattering and intervalley scattering to strained-Si(101) material is discussed.In addition, a calculation of the electron mobility in Strained-Si(101) material is made using the average momentum relaxation time method described in Ref[1]. The results show that the electron mobility increases gradually for both [001] and [100] orientations while for [010] orientation increases rapidly with the increasing Ge fraction x.

Abstract: We have carried out a series of calculations to investigate the electronic band structure of bulk HgTe strained along c-direction with the constant-volume by means of the full potential linearized augmented plane-wave method. Our results show that there is a topological insulating phase induced by the lattice distortions, which is in agreement with previous theoretical and experimental results. Importantly, the distortion-induced band gap is large up to 0.19 eV in either expansion or compression along c-direction. It is indicated that the bulk HgTe under proper lattice distortions would be possibly made the room temperature application for material engineering with low energy consumption.

Abstract: Microwave absorbing properties of composites containing activated carbon-fiber felt screens (ACFFSs) have been investigated. Samples with different types of ACFFSs embedded in composites were fabricated. Experiments were carried out to test the absorption effect of embedded ACFFSs. It is found that both the ACFFS patterns and its element configurations are critical for the reflection properties of samples. With the distance between strips and the width of strips in the inductive ACFFS decreased, the absorbing properties of composites are improved. The composite obtains a reflection loss below –10dB in 8~18GHz, which is the frequency range the radar works in, when the distance between strips and the width of strips are 7mm and 5mm respectively. With the side of plates and the distance between plates in the capacitive ACFFS reduced, the absorption effect of composites rises. When the distance between plates and the side of plates are 5mm and 7mm separately, the composite achieves a reflection loss below –10dB over a bandwidth of 8.7GHz and the minimum value of absorption rate reaches –31.7dB.

Abstract: This paper research applied to using energy-saving insulation in hot summer and warm winter area of sandwich wall panels, study on thermal insulation thermal insulation property of composite wall panel through 2 sets of thermal performance test, and the test results for comparative analysis with finite element analysis results. The analysis shows that the wallboard is not only good insulation properties, but also to meet the requirements prescribed by the state building energy-saving insulation and hot summer Cold Winter areas of building energy-saving insulation requirements.

Abstract: Based on the study of cutting properties of titanium alloy, and according to its features, several commonly used honing stones materials are selected to carry out the wear experiments of deep-hole honing for the alloy. the analysis of the experiments results shows the suitable for titanium alloy TC11 deep-hole drilling is identified.

Abstract: In the article, the effect of SO₄^2- on the corrosion behavior of boiler water-wall material 20G under the equilibrium phosphate treatment (EPT) was studied by a series of electrochemical experiments at room temperature. Electrodes AC impedance value (Rp) was used to evaluate the corrosion resistance of the material. The experiment results show that, SO₄^2- ion is aggressive anion; water-wall tube material 20G has certain sensitive corrosion to the SO₄^2- . The 20G electrode AC impedance value decreases with the increase of the SO₄^2-’s concentration and the material corrosion resistance reduces.

Abstract: This paper analyzed the application status of Si in high speed tool steel, cold working die steel, hot work die steel and plastic die steel. On this basis, the effect of Si on the properties of different types of tool and dies steels is summarized. There is the certain reference value of the application of Si in tool and die steels.

Abstract: This paper establishes the prediction model for the NOx emission with Material Properties based on the artificial neural network,and predicts the NOx emission before and after the borler’s combustion reform .First, this paper analyzes the NOx formation mechanism. Then,this paper establishes the prediction model for the NOx emission with Material Properties based on the artificial neural network,which uses the main factors of influencing NOx formation as input variable. At last , this paper trains new samples again,and predicts the boiler NOx emission after the boiler’s low NOx combustion reform.This paper demonstrates that the model is effective for predicting boiler NOx emission before and after the boiler’s low NOx combustion reform.