Advanced Materials Research Vols. 557-559

Abstract: Fly-ash floating beads particle reinforced Al foam matrix composite was fabricated by stirring casting method. Orthogonal test method shows that main influence factors on the fabrication of Al foam matrix composite from big to small in proper order is foaming time, foaming temperature, and amount of foaming agent. The optimum preparation process condition is as following: the foaming temperature is 800°C, the amount of foaming agent is 3%, and the foaming time is 12 min.

Abstract: In this study Ti/Cu-Cr/S20C were clad by High Press Torsioning(HPT) and the effect of post-HPT heat treatment on the interfacial reaction products and the mechanical performance in Ti/CuCr/S20C clad material were studied. No cracks were observed to be emanated from the corner of the indentation mark on the intremetallic compound layer at the Ti/Cu-Cr interface, suggesting those intermetallic compounds is not so brittle. The stress-strain curves exhibited three steps in as-HPTed clad samples and those heat-treated at 500°C for 1hr. Step-wise fracture occurred in the sequence of S20C, Cu-Cr and Ti with each fracture resulting in the sudden drop of the stress. The stress-strain curves exhibited two steps in clad metals annealed at 600°C for 1hr, with first step corresponding to the fracture of S20C plate and the second one corresponding to the concurrent fracture of Ti and Cu-Cr plates. Ti/Cu-Cr/S20C heat-treated at 600°C for 24hrs exhibited just one step final fracture, suggesting that the bonding strengths are high enough to resist the localized strain concentration at the interfaces.

Abstract: A study of a new structured composite absorbing material, prepared using carbonyl iron and graphite as absorbers within a resin matrix. The study investigated the effects of varying the concentration of absorbing agent within the layers of the absorbing composite. Results show that the best absorbency was achieved when the impedance-matching layer contained 20% carbonyl iron content and the absorbing layer contained 35% graphite. The peak absorption was -20.19 dB, with a bandwidth of 7.3GHz (R< -10 dB) in the frequency range of 8 to 18 GHz. This work will certainly have significance guiding research on the application of stealth materials and composite materials.

Abstract: A novel Yttrium complex C₄H₁₂K₂O₂₂S₂Y₂ has been synthesized from a single solution reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Y1 atom is coordinated by eight O atoms. The crystal is stable by the help of O-H…O intra- and intermolecular hydrogen bonds interaction.

Abstract: Sodium lignosulfonate/PCL composites were prepared and characterized in this research. The LS/PCL composite was prepared by a twin-screw extruder to obtain fully blended composite. SEM and TGA were used for analysis of the morphology and thermostability of LS/PCL composite, respectively.

Abstract: A novel Gadolinium complex Gd (C₃O₉H₆) has been synthesized from a hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Gd atom is coordinated by sixteen O atoms. The two-dimensional layered structure is formed and exhibits extensive O-H…O hydrogen-bonding interactions.

Abstract: The thermal shock resistance of ZrO₂/LaPO₄ composites containing LaPO4 with different particle size was investigated. Microstructure, mechanical properties and RIV para_{Subscript text}meter were evaluated and discussed. On the basis of theoretically calculated RIV values and experimental results, resistance to thermal shock damage would be more strongly favoured with composites containing LaPO₄ calcined at 1100°C for 1 h

Abstract: A stable n-HA non-aqueous sol was prepared. During the reaction, the gelatin coated the surface of n-HA rod and chemically bonded with the n-HA. PA66 was dissolved in formic acid and then added to n-HA sol with constant stirring for 3 hours at room temperature, a homogenous composite of 40wt.% n-HA and 60wt.% PA66 was successfully synthesized. It was found that no new phases appeared during formulating the n-HA sol and PA66 solution, but the crystallinity of PA66 was lower. The amide groups in the gelatin are same as PA66, the gelatin coated n-HA sol and PA66 solution have very good compatibility. The developed n-HA/PA66 composites were then soaked in a simulated body fluid (SBF) for 1, 2, 3, and 4 weeks, respectively. It was found that the composites immersed for 2 weeks effectively induced a new bone-like apatite layer with lower crystallinity. The n-HA/PA66 composites have much better bioactivity than PA66.

Abstract: The conductivity and dispersing of carbon nanotube/mica composite powder in the epoxy resin are researched. The pictures of SEM and TEM indicated that the diameter, content of carbon nanotube, dispersing and the diluted solvent have important influence on the conductivity of resin. The carbon nanotube/mica composite powder can make the epoxy resin have a lower volume and surface resistivity less than 10¹⁰Ω.cm.

Abstract: Conductive polyaniline/boron carbide (PANI/B4C) composites have been synthesized by in-situ polymerization of aniline in the presence of B4C particles. The structure and thermal stability of obtained composites were characterized by FTIR, XRD and TGA. The results showed that PANI and B4C particles were not simply blended, and a strong interaction existed at the interface of B4C and PANI. In the PANI/B4C composite, the degree crystalline of PANI increased and diffraction pattern of B4C was all but of amorphous. And that the composites were more thermally stable than that of the pure PANI. Electrical conductivity measurements indicated that the conductivity of PANI/B4C composites was much higher than that of the pure PANI and the maximum conductivity obtained was 35.6 S•cm-1 at 20 wt% of B4C.