Advanced Materials Research Vol. 496

Abstract: Thordon is a new liner material used widely in water-lubricated bearings in virtue of its shockproof characteristic, high load and wear resistance. The category of materials used in water-lubricated bearings was briefly outlined and tribological characteristics of most of the materials were compared in the paper. The defects of the traditional water-lubricated bearing materials were listed and the advantage of the Thordon bearing was presented. The development status and the tribological characteristics of the water-lubricated Thordon bearings were studied. The application prospects of the water-lubricated Thordon bearings were introduced in the end of the paper.

Abstract: Isothermal oxidation kinetics of U71Mn steels under pure CO₂ at 1073--1473K are experimentally studied in this paper. The oxidation kinetic results are similar: mass increase per unit area as function of oxidation time nearly follows linear role for long time, with a more rapid increase at the begin. Oxidation rate constants of the steel under pure CO₂, from 1073K to 1473K, keep exponential law as function of oxidation time.

Abstract: Pepper (Capsicum annuum L) is an important economic vegetable crop in worldwide, however the pepper blight caused by Phytophthora capsici has been epidemic in many countries. Little is known about pepper–oomycete interactions at the molecular and genetic levels. The objective of this study was to identify transcriptionally regulated genes during an incompatible interaction between pepper and P.capsici using cDNA-AFLP technique. A total of 100 transcript-derived fragments (TDFs) were sequenced. The result revealed that 84 (88.0%) TDFs produced specific sequences, among which 19 TDFs had relatively clear functions in various categories. Seven TDFs (9.5%) shared high similarities with defense- or stress-related proteins. The TDFs identified in this study will serve as candidates for further studies to determine their functions and dissect the molecular networks involved in the pepper- P.capsici interactions.

Abstract: In order to mold preservation to bamboo, the effect of the extractives from 28 tree leaves on bamboo biology mildewing was studied basing on full-factor test. The result was as follows: (1) The inhibition rate became lower for steam time longer. (2) The effects of soaking time and boiling time were all small at steam time of 1h. And The effects of Cinnamomum camphora leaves were better than ones of Cedrus deodara leaves. (3) Soaking, water boiling and steaming had synergy mold preservation to bamboo by Cinnamomum camphora tree root, Cinnamomum camphora leaves and Cedrus deodara leaves.

Abstract: In this paper the TiNi/Ti2Ni composite powders has been synthesized by the chemical reaction between titanium and nickel powders in high temperature molten salts. Results of the differential scanning calorimetry (DSC) confirmed the reverse martensitic transformation of the prepared TiNi powder in the TiNi/Ti2Ni composite powders. The backscatter electron images of the scanning microscopy (SEM) of the end-products before washing by distilled water showed that the synthesized TiNi/Ti2Ni composite particles were captured by the molten salts, which revealed the mechanism of the chemical reaction in molten salt.

Abstract: Embankment filling is a process step by step. The influences of its filling height changes on the stress and deformation can not be reflected in a load. However, in the actual construction, it leads to quality accident in embankment construction that filling usually doesn’t control the thickness according to the requirement of construction specification. In order to reveal the stress and strain law of about 72 m high rock-filled embankment during the construction, and provide a scientific reference to construction quality control of the embankment, according to the typical cross section of the Hurongxi highway, using two loading modes to simulate the embankment filling, the internal stress, strain and corresponding graphics of different control points of the embankment under the various loads were presented. The results of the two loading modes are analyzed and compared. It shows that the settlement, stress and construction quality control points of the embankment are different and larger under the different loading

Abstract: The Cu0.81Ni0.19 has been synthesized directly from elemental powder of nickel and copper by mechanical alloying. The alloyed Cu0.81Ni0.19 alloy powders are prepared by milling of 8h. The grain size calculated by Scherrer equation of the NiCu alloy decreased with the increasing of milling time. The end-product was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM)

Abstract: Micro-arc oxidation (MAO) together with hydrothermal treatment had been performed to improve the corrosion resistance of magnesium alloy. The oxide films were hydrothermally heated at 150°C for 2h. The morphology of samples were characterized by SEM/EDS. The phase compositions were examined by TF-XRD. The corrosion resistance of the coatings was evaluated by electrochemical methods in Hank’s solution. The MAO films displayed porous and rough structure and were mainly composed of MgO and MgAl2O4. After hydrothermal treatment, a dicalcium phosphate dihydrate (DCPD) coating formed on the oxide film. The corrosion resistance of the MAO film and DCPD coating was increased by about 12 and 40 times higher than that of bare magnesium alloy.

Abstract: Graphite encapsulated iron nanoparticles were prepared by ball-milling and subsequently annealing a mixture of expanded graphite and iron powders. The nanoparticles were characterized by transmission electron microscope (TEM) and X-ray diffraction (XRD). The formation mechanism of the nanoparticles was discussed. The results show that the nanoparticles have a size range of 20-150 nm, and graphite and iron in the nanoparticles have a higher crystallinity

Abstract: Expanded graphite was used for absorbing methyl orange in water and crude oil floated on water. The effect of agitating sorption system including crude oil or methyl orange, water and expanded graphite on the sorption behavior of expanded graphite for the two materials was investigated, and the sorption mechanism of expanded graphite for the two materials was discussed. The results show that agitating sorption system is advantageous for the methyl orange sorption, but disadvantageous for the crude oil sorption.