Photoacoustic Study of Polymer Blends of PVF<inf>2</inf>-TFE and PET/PBT
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The mechanical and electrical properties of polymer blends are dependent on the crystallinity of each component. The standard methods of characterizing polymer crystallinity are by IR and thermal calorimetry. However, disadvantages arise for both methods. IR requires very thin samples which may alter the crystallinity. For thermal calorimetry, the melting endotherms for each component cannot always be detected. The use of photoacoustic spectroscopy (PAS) is not hindered by the above problems. To this end we use PAS to characterize two blends. One is of the polyesters PET/PBT and the other of different molecular weights of PVF2-TFE copolymers. The polyester blends have been characterized by IR and will be compared to the PAS results to determine quantifying procedures, which are then applied to the PVF2-TFE blends. The effect of blending high and low molecular weight copolymers on the piezoactive B phase crystals is reported.Cite
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Vickers hardness test
Functionally graded material
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Porous SiC Ceramics with Multiple Pore Structure Fabricated via Gelcasting and Solid State Sintering
Porous SiC ceramics with multiple pore structures were fabricated via gelcasting and solid state sintering.A novel gelling agent of Isobam was applied and PMMA was used as both foam stabilizer and pore forming agent.The mechanical properties of porous SiC ceramics were investigated as functions of PMMA content, rotating speed of ball mill, and sintering temperature.With PMMA content increasing from 5wt% to 20wt%, the foaming effect was inhibited while the stability of bubbles increased.When the rotating speed was 220 r/min, the open porosities of the as-prepared SiC ceramics sintered at 2100 varied ℃ from 51.5% to 72.8%, and compressive strength varied from 7.9 to 48.2 MPa.With the rotating speed increasing from 220 to 280 r/min, the foaming effect was aggravated and the porosities of SiC ceramics sintered at 2100 increased.℃ While the sintering temperature increasing from 2050 to 2150 , ℃ the SiC ceramics prepared with PMMA content of 20wt% at rotating speed of 220 r/min decreased in the open porosities while increased in compressive strength.
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ZrB2 based composites containing 10 vol.-% carbon nanotubes (CNTs) are synthesised by spark plasma sintering at temperatures ranging from 1600 to 18008C and at an applied pressure of 25 MPa. The effects of sintering temperature on densification behaviour, microstructural evolutions and mechanical properties are presented. Results indicate that ZrB2-CNT composites fabricated at 16508C have the optimal combination of dense microstructure and properties. The fracture toughness is sensitive to the temperature change and reaches 7.2 MPa m1/2 for the CNT toughened ZrB2 ceramics, which is higher than the measured result for monolithic ZrB2 (3.3 MPa m1/2). The crack deflection and CNT pullout are the dominant toughening mechanisms.
Spark Plasma Sintering
Toughening
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Spark Plasma Sintering
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Relative density
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Nanocrystalline material
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