Advanced Materials Research Vol. 744

Abstract: Ability to testify effect of carboxymethocel cellulose, use 5000-mesh hollowness particle, carboxymethocel cellulose and sodium silicate to study anti-fatigue nature of coating, examine performance of industrial test, apply metallurgy transmission method to build math model and check test results by comparison of theory value and test value. Carboxymethocel cellulose enhances adhesion performance between coating and steel plate, resolves key matter that coating tends to come off in test. Continuous heating-cooling tests displayed that insulation performance of coating doesnt reduce with reduplicative application, anti-fatigue test has no effect on insulation performance. Insulation coating can play a role in industrial production. After coating was applied in steel ladle, temperature drop of liquid steel notably decreased, energy consumption reduced accordingly in steelmaking, steel plant can obtain direct economic benefit. Thickness of coating is 0.8mm, test value approximates theory value for outer temperature of steel plate.

Abstract: Based on scale and output, process design assures high-end products for Baogang, ensures advancement and reliability of devices, enhances Chinese split supply ratio; ability to decrease investment and implement sustainable scientific outlook on development. To introduce production scale and product scheme in Baogang 2250mm hot rolling project, and illustrate design flow, process arrangement and equipment level. Ability to insist on a high starting point, reference to international standards, use advanced devices in order to meet high-quality needs and achieve strong competitiveness, adhere to strategy of sustainable development, improve on utilization efficiency of raw materials, energy and water, accomplish cyclic utilization. Leading products are high-quality rare-earth auto plates, steel sheets for home electrical appliances. The layout of plant is tightly linked with process design and whole plan, short process, smooth logistics, less middle stages and advanced automatic control system create international level in 21st century.

Abstract: By the test of hydrothermal aging, the effect on the structures and properties of APMOC fiber is studied, while monofilament tensile test and the corresponding structural analysis are carried out on the test samples. The results show that, in the range of experimental temperature and humidity, APMOC had no significant change in molecular structure; after hydrothermal aging, the tensile strength, elongation and elastic modulus of APMOC fiber show some fluctuation, instead of downward trend continually, there are more obvious effects on the changes of the tensile strength from temperature, i.e. the higher the temperature, the lower the tensile strength during the process of aging. The general effect of thermal aging on fiber properties are the embrittlement and the decreased elongation. The microscopic mechanism of fiber failure modes from raw fiber splitting to brittle rupture is interpreted through the scanning electron microscopy (SEM) observation on the tensile fracture before and after aging, combined with the skin core structure characteristics of APMOC fiber.

Abstract: Carbon nanotubes (CNTs) were dispersed in aqueous solution with the inorganic compounds (H₃O₄₀PW₁₂ and H₃BO₃) by ultrasonic agitation. The dependency relationship between the inorganic solution concentration and CNTs dispersity was investigated by spectrophotometry. The results show that H₃O₄₀PW₁₂ and H₃BO₃ can promote CNTs dispersion in aqueous solution. CNTs disperse very well in the appropriate concentration. The optimal concentration of H₃O₄₀PW₁₂ solution is 2mg/mL, and the optimal concentration of H₃BO₃ solution is 4mg/mL. CNTs static stability in H₃BO₃ solution is better than that in H₃O₄₀PW₁₂. CNTs can still keep good dispersity in H₃O₄₀PW₁₂ solution under high speed centrifugation. The strong adsorption effect between CNTs surface and inorganic compound induces the dispersive stability of CNTs in aqueous solution.

Abstract: The modification of CaCO₃ powder was studied by the composite modifier in n-butanol and water solution. Aluminate coupling agent (ACA) and stearic acid (SA) were added as the composite modifier. The characters of modified CaCO₃ were investigated by the contact angles and infrared spectroscopy (IR). It was found that the contact angles/water of modified CaCO₃ powder increased with the increase of SA/ACA weight ratio, and showed a maximum when ratio was 0.8:1. The contact angles/water of modified CaCO₃ powder obtained in optimum conditions was 136.5°. The results indicated that the surface character of CaCO₃ powder exhibited hydrophobic properties. When adding the active CaCO₃ into PE (the weight ratio of CaCO₃/PE about (20:100), the mechanical properties of PE were remarkably improved.

Abstract: The mixing mechanism of short fiber/rubber composite was analyzed. The clearance between the rotor edge peak and mixing chamber influenced mixing, dispersion and length of the short fibers in compound. The new rotor was designed with variable clearance. The large clearance gap improve the mixing, and the small clearance gap helped to improve the dispersion of short fiber. The mixing quality and performance of short fiber/rubber composite were improved by using the new rotor, and the production efficiency increased.

Abstract: The alloy rods with diameters of 3.0 mm of Cu_50-xZr₄₂Al₈Ag_x(x=0,2,3,4)were prepared by means suspend melting-copper mold suction casting. The structure and thermal stability of the alloys were analyzed by X-ray diffraction (XRD) and differential scanning calorimetry (DSC), respectively. Subsequently, compression performance and fracture morphology of these bulk metallic glasses were investigated .we focus on analysis that influence of Ag micro-addition on the deformation and fracture of speciments. The results showed that the addition of Ag can enhance the forming ability and thermal stability of amorphous alloys. At the same time, with the increase of Ag content, the breaking strength of samples was improved from 1747Mpa to 2038Mpa. Without obvious plastic elongation percentage in bulk metallic owing to non-homogeneous modes of texturing at room-temperature. The compression failure behavior of test samples belong to elastic failure and the maximum failure extensibility is 3.7%.The fracture pattern of test samples all assume venation pattern.

Abstract: In order to optimize the preparation process of silver-loaded diatomite, the effect of the adsorption time, temperature and the concentration of silver nitrate on the content of silver ions in diatomite were investigated through ion exchange experiment method. And the antibacterial properties were measured by Haloes method. The samples were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The results show that the loading of the silver ions is no change in the microscopic structure of the diatomite, the silver exists in diatomite as the ion. The content of silver in the diatomite is 0.523g/g under the condition of AgNO₃ (0.5mol/L) and temperature 70°C. The silver-loaded diatomite has good antibacterial activity on E. coli.

Abstract: Cobalt ferrite (CoFe₂O₄) thin films have been prepared on Si (001) substrates, with different calcined temperatures (T_cal=400°C~800°C). The films structure was studied by X-ray diffraction (XRD) and their surface was examined by scanning electron microscopy (SEM). The magnetic properties were measured with a vibrating sample magnetometer (VSM). For low calcined temperatures, the films presented a mixture of a CoFe₂O₄ phase, with the cubic spinel structure, and cobalt and iron antiferromagnet oxides with CoO and FeO stoichiometries. As the calcined temperature increased, the CoO and FeO relative content strongly decreased, so that for T_cal=800°Cthe films were composed mainly by polycrystalline CoFe₂O₄. The magnetic hysteresis cycles measured in the films were horizontally shifted due to an exchange coupling field originated by the presence of the antiferromagnetic phases.

Abstract: Uniform and well-dispersed photoluminescent semiconductor CdSe (Cadmium selenium) QDs (Quantum dots) were in-situ prepared by taking G4.0-NH₂ PAMAM(polyamidoamine) dendrimers as inner templates in water and methanol respectively. The prepared solutions containing photoluminescent semiconductor CdSe QDs were utilized for detection of unfumed oil fingerprints on tinfoil. The results show that unfumed latent fingerprints treated with prepared CdSe/PAMAM nanocomposites both displayed yellow emission and the latent fingerprints were detected clearly, while treated with CdSe/PAMAM composites in water manifested stronger emission compared with those treated with CdSe/PAMAM composites in methanol; Also, the veins of fingerprints treated with CdSe/PAMAM nanocomposites in methanol became slim because of the dissolution of methanol to oil components in fingerprints.