Advanced Materials Research Vols. 306-307

Abstract: This paper summarizes the function of styrene-butadiene rubber (SBR) in cement-based materials, focusing on the achievements of the authors in recent years. The effect of SBR on the properties of cement mortar is introduced, i.e. the workability of fresh mortar such as the water-reduction and water-retention effects of SBR, the mechanical properties of hardened mortar such as the tensile bond strength, flexural and compressive strengths, flexibility and anti-impacting capacity, the waterproofness such as the capillary water adsorption and anti-penetration capacity, the microstructure such as the matrix structure and interface structure, and the cement hydration such as the calcium silicate hydrates, calcium aluminate hydrates and polymerization of [SiO₄]^4- tetrahedron.

Abstract: In this paper, a type of high efficient ultra-thick high-chromium cast iron surfacing flux-cored wire with a diameter of 6mm is designed. To solve the technological problem that the processing property of ultra-thick flux-cored wire can not satisfy the welding requirement, the author adopted “inter twist connection” and “inner wire” technologies. The effect of B on the microstructure and property of deposited metal was investigated by means of optical microscopy (OM), X-ray diffraction (XRD) and abrasion test. The test of engineering application was carried out on sinter raw material transport system in steel enterprises. It is proved that the welding efficiency and the service life of wear-resistant parts are significantly improved. The ultra-thick high-chromium iron surfacing flux-cored wire has a wide application prospect.

Abstract: The W-Ti-Co powders was doped different content of TaC with an average particle size of 270nm were prepared by 72 hours high-energy ball milling. The powder was cold isostatic pressed and vacuum sintered at 1380°C. The physical properties and the micrographs of samples were detected. The main conclusions were as follow: the density and Cobalt magnetic decreased with the content of TaC increasing, the coercivity increased at first and then decreased, the coercivity of alloy with 0.6wt.% TaC was higher than the other. When the content of TaC was less than 0.6wt.%, the hardness increased with the content of TaC increasing .While when the content of TaC was more than 0.6wt.%, the hardness decreased obviously. Comparing with the alloy without TaC doped, the transverse rupture strength (TRS) of the alloy with 0.4wt.%TaC increased to a larger extent. When the content of TaC was more than 0.4wt.%, the transverse rupture strength (TRS) decreased with the content of TaC increasing. The TaC could inhibit the grain growth, and the comprehensive performance of the alloy with 0.4wt.% TaC was best.

Abstract: The paper studied the microstructure and properties of new aluminum-based sliding bearing alloy, which Cu, Ni, Mg, Sn, Ti, B... elements were appropriately added. The as-prepared aluminum alloy was investigated using scan electron microscope (SEM). The results show that the alloy microstructure is α-Al crystalology matrix with Tin and some compounds, contribute to suitable strength, hardness and plastic level for manufacturing whole sliding bearing. All of that are mainly got credit for solid solution strengthening and precipitation hardening. Sufficient soft tin in grain boundary makes the alloy have excellent antifriction performance, anti-seizing.

Abstract: A new magnesium alloy, named as Mg-6Zn-6Al(ZA66), using for thixoforming production has been developed. The microstructure of the material during partial remelting holding in the semi-solid state was characterized. The results indicate that non-dendrite microstructure in ZA66 magnesium alloy billets can be obtained, but the proper partial remelting temperature and holding time should be select. After being treated at 575°Cfor 20 min, the ZA66 alloys can obtain a non-dendritic microstructure with finer unmelted primary solid particles (37 μm) and shape factor about 0.6. With the increasing holding temperature from 575°C to 590°C,the average size of unmelted primary solid particles increases and globular tendency becomes more obvious.

Abstract: Series of Al–P master alloys including binary Al–P and Al–Si/Zr–P master alloys containing pre-formed phosphides have been developed. Hypereutectic A390 alloys have shown fast refinement response to the addition of series of Al–P master alloys. After refined at 780°C for 30 min, the coarse primary Si can be refined obviously from 90 μm to less than 20 μm. In addition, the morphologies of primary Si are changed from coarse polygon to near-sphere shape, and the distribution is improved simultaneously.

Abstract: In this paper, the regularity of thickness thinning was analyzed from the perspective of controlling the plastic deformation energy during the forming process, then a thickness thinning criterion based on vacuum forming was proposed, and then the forming mechanism of thickness thinning was revealed. Experiment results have shown that the proposed thickness thinning criterion can predict the quality of refrigerator inner liner under new forming condition effectively.

Abstract: Removed at author request due to unrepeatable results

Abstract: A series of superhydrophobic films comprised of polyurethane elastomer with different mechanical property was fabricated via polymer replica, and a friction testing was used to evaluate their abrasion resistance. Some of as-prepared superhydrophobic films exhibited durability against abrasion: after being loaded with 2945.7 Pa and being rubbed by a polish metal surface at 18cm s^-1 20000 times, contact angle remains more than 155°, which demonstrate that the abrasion resistance of superhydropobic films depend on the tensile strength and ultimate elongation of elastic micro-protuberances on films.

Abstract: A new kind of fluorescence spectrometry method for the determination of Rutin has been developed in the presence of p-sulfonatephenylazocalix[8]arene, which has good solubility in water and spectral activity. Under optimum conditions, the linear range was obtained over the 0.2～4.5μg/mL, and the detection limit was 1.949×10^-3 μg/mL. This method was used to determinate the content of Rutin in pagodatree flowers and the results were satisfied. It offered potential advantages of simplicity and sensitivity.