Papers by Keyword: Heat-Treated

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Authors: Qiang Shi, Jing Hui Jiang
Abstract: This study describes experiments of testing the color stability of heat-treated okan sapwood samples. Heat-treatment was done at 160°C,180°C,200°C,220°C during 4 hours, under steam. series of experiments were carried out to investigate the color stability of heat-treated okan sapwood compared to untreated wood during 100 hours xenon light irradiation. Color measurements during accelerated weathering were made at intervals throughout the test period. The results are presented in △E* and L* a* b*coordinates according to the CIE(1976)L*a*b* parameters color system. Better photo-stability in terms of color changes was recorded for heat-treated wood compared to the untreated one. The properties of heat treated wood are involved in the heat-treated wood resistanceagainst xenon light under experimental conditions.
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Authors: Ning Wang, Shuen Hou, Hong Yun Jin
Abstract: Crystallization of the basalt fibers can reduce their mechanical property. This paper is devoted to understand the crystallization behavior of basalt fiber and its control conditions. Basalt fibers were heated at 700, 750, 800, 900, 1000, 1050 °C for 2h, then cooled down to room temperature in air. The crystallization behavior of basalt fiber was investigated by means of differential thermal analysis (DTA), X-ray powder diffraction (XRD) and Fourier transform infrared spectrometry (FTIR). The results indicate that diopside and anorthite phases appeared during crystallization process and the absorption bands of heat-treated samples in FTIR spectra split and become relatively sharp.
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Authors: Jia Horng Lin, Cheng Tien Hsieh, Jin Jia Hu, Yueh Sheng Chen, Wen Cheng Chen, Ching Wen Lou
Abstract: Polylactic acid (PLA) fiber, as a biodegradable synthetic aliphatic polyester fiber, has properties of biocompatibility, biodegradability and processing. Therefore, this study used PLA multifilament to prepare numerous plied yarns, respectively 75D, 75D×2, 75D×3, 75D×4 and 75D×5. Afterwards, these yarns were twisted with 3, 5, 7 twist/inch and then heat-treated respectively. The resulting yarns were tested for their tensile property tensile tenacity and tensile elongation. Moreover, the heat-treated effect was discussed on influencing tensile property.
963
Authors: Jin Sun, Xiao Bo Wang, Xiao Jing Wang, Yan Lin, Zhen Zhong Gao
Abstract: Five hardwood species (Schima superba Gardn, kapur( Dryobalanops sp.), ash (Fraxinus mandshurica Rupr.), birch(Betula platyphylla Suk.), tauari (Couratari sp.)) were conducted the Heat treatment at 185°C.. The results indicated that the dimensional stability, modulus of elasticity (MOE) increased greatly while the wettability decreased after treatment. There was a negative impact of heat treatment on MORs.
1132
Authors: Jian An Liu, Mei Mei Zhang, Xue Na Yang, Shu Jiang Liu
Abstract: Based on the SrO-Al2O3-Fe2O3-B2O3 system, the nano-ferrimagnetic glass ceramics has been prepared through heat treating the melted glass. Using the aqueous solution solvent evaporation and melt method, we firstly obtained the molecular-scale homogenously mixed compound. And thus the glass specimen was produced by naturally cooling the batch melts. The crystallization of the glass systems with diffirent component has been systematically investigated by using X-ray diffraction (XRD), Thermo gravimetric (TG), Differential Thermal Analysis (DTA) as well as Vibrating Sample Magnetometer (VSM). It is found that Fe3O4 crystal precipitated during naturally cooling the melt from 1500°C to anneal temperature. Moreover, the nano-ferromagnetic glass ceramics with the main crystal phase of SrFe12O19 was obtained after heat-treated at 865°C for 2 hours. The size of crystal was 20-50nm. The magnetic properties of the obtained ferromagnetic glass ceramics indicated that the saturation magnetization and the intrinsic coercivity were 32A•m2/kg and 236KA/m, respectively.
384
Authors: Jian An Liu, Mei Mei Zhang, Xue Na Yang, Wen He
Abstract: Based on the SrO-Fe2O3-FeO-SiO2-B2O3 system, the M-type strontium hexaferrites glass ceramics has been prepared through heat treating the melted glass. Using the aqueous solution solvent evaporation and melt method, we obtained the glass precursor of molecular-scale homogenously mixed compound. The precursor was completely melted in a lidded platinum crucible placed in an electric furnace at 1480°C for 1h and then annealed in a furnace at 550°C for 40min. The crystallization of the glass systems with different component has been systematically investigated by using X-ray diffraction (XRD), Transmission Electron Micrographs (TEM) as well as Vibrating Sample Magnetometer (VSM). It is found that Fe3O4 crystal precipitated during naturally cooling the melt from 1480°C to anneal temperature. Moreover, the hexaferrite glass ceramics with the main crystal phase of SrFe12O19 was obtained after heat-treated at 860°C for 2 hours. The magnetic properties of the obtained hexaferrite glass ceramics indicated that the saturation magnetization and the coercivity were 8.1A•m2/kg and 114KA/m, respectively.
855
Authors: Rong Jun Zhao, Xian Bao Cheng, Wei Wei Shuangguan, Juan Sun, Ben Hua Fei
Abstract: In this paper, the zero-span tensile strengths of tracheids of Chinese fir and Masson pine were investigated, and the effect of the moisture on the tracheid strength was also discussed. Furthermore, the influence of thermal treatment on the zero-span tensile strengths of tracheids were analysed, and research of relationship of zero-span tensile strengths, chemical components and cellulose crystallinity were also conducted. This study tried to explore the inherent mechanism of heat treatment on the cell level.
1896
Authors: Radzali Othman, Farah Jaafar
Abstract: A study on the crystallization behavior of a soda-lime-silica glass composition incorporating rice straw ash was carried out. Melting was carried out at 1500°C in an alumina crucible for 5 hours. The glass produced was examined by differential scanning calorimetry to determine the glass transition and crystallization temperatures for use as heat-treatment temperatures to transform the glass into glass-ceramics. A similar composition made up using industrial chemicals was also melted for comparative purposes. Both glasses were heat-treated at 750°C and 920°C for 3 different soaking durations. Both glasses exhibited crystallization from the outer surface which increased in thickness as the soaking time was increased. Scanning electron microscopy was used to study the thickness and identity of the crystalline phases formed. Density and hardness measurements showed that the rice straw glass ceramics exhibited higher values than the glass-ceramics using industrial chemicals. The morphologies of the fracture surfaces of both glass-ceramic compositions were also evaluated by scanning electron microscopy.
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