Effects of B-site substitution and annealing on the structural and microwave dielectric properties of CaTiO3 ceramics

Chen, J. S.; Chen, G. H.; Kang, Xiao-ling; Yang, Tao; Li, Z. C.; Yang, Yun; Yuan, Changlai; Zhou, Changrong

doi:10.1007/s10854-016-5526-x

Cited by 11 publications

(8 citation statements)

References 22 publications

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“…Chen et al [15,16] and Potluri and Sagar [17] defined yarn bending, yarn flattening, yarn cross-section deformation, void/gap condensation, and nesting as the basic compaction effects. Figure 3 (left image) schematically shows an uncompressed and compressed stage of a fiber/textile to illustrate these effects.…”

Section: Textile Compaction Behaviormentioning

confidence: 99%

“…At first, the thickness reduction of the fabric is linear when applying a perpendicular compaction force/ pressure. The dominant factors in this initial phase are flattening of the yarns and the reduction of pores and gaps among the fibers and yarns [15][16][17]. With increasing compaction force the free pore spaces gets further decreased and the linear behavior turns out into to a nonlinear.…”

Section: Textile Compaction Behaviormentioning

confidence: 99%

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Investigation of the compaction behavior of carbon fiber NCF for continuous preforming processes

Grieser

Mitscháng

2015

Polymer Composites

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This paper describes the experimental investigation of the compaction behavior of dry single‐ply and multi‐ply fabric stacks (preforms). Utilizing four biaxial (two 0°/90° and two ±45°) and one triaxial (0°±45°) carbon fiber NCF, differing in weight (300 g/m2, 600 g/m2) and type of stitching (tricot, pillar, hybrid), the influence of compaction speed, pre‐compaction cycles, number of layers, and stacking sequence on compaction force was examined. In contrast to other studies, the area of interest is limited to 40–50% fiber volume content (FVC), which is based on current continuous preforming conditions. The results showed that higher testing speeds result in increased compaction forces. Pre‐compaction cycles (up to 8) significantly reduce (up to 69%) the required compaction forces of preforms for continuous preforming. Furthermore, at an equal total superficial density (1800 g/m2), 6‐ply preforms (300 g/m2 each ply) require 75–88% higher compaction forces than 3‐ply preforms (600 g/m2 each ply). This relation remains constant with decreasing or increasing total superficial density (ply number). Also the stacking sequence of 6‐ply preforms (300 g/m2 each ply) remarkably influences the compaction force, whereby the stitching seam pattern and their alignment (superposition) to each other were the main influencing factors. POLYM. COMPOS., 38:2609–2625, 2017. © 2015 Society of Plastics Engineers

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Section: Textile Compaction Behaviormentioning

confidence: 99%

Section: Textile Compaction Behaviormentioning

confidence: 99%

Investigation of the compaction behavior of carbon fiber NCF for continuous preforming processes

Grieser

Mitscháng

2015

Polymer Composites

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“…DSS are indeed susceptible to secondary phases precipitated in a wide temperature range (600-1,000°C), and their excellent characteristics may be negatively affected. Secondary phases (the intermetallics r-and vphase, nitrides) may form during very short isothermal treatments [1][2][3][4] or as a consequence of very slow cooling rates from the solubilization temperature [5,6]. These phases are Cr-rich structural discontinuities that promote localized corrosion attacks and reduce the impact toughness resistance [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…The formation of secondary phases in DSS as a result of continuous cooling and isothermal treatments has been extensively studied [1][2][3][4][5][6][7]. Thermodynamic simulations on multi-component systems have shown that r-phase (the main intermetallic compound) is not a structural anomaly resulting from manufacturing errors, but belongs to the equilibrium microstructure of all DSS [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Thermodynamic simulations on multi-component systems have shown that r-phase (the main intermetallic compound) is not a structural anomaly resulting from manufacturing errors, but belongs to the equilibrium microstructure of all DSS [6,7]. However, previous studies have evidenced that the precipitation of intermetallics mainly concerns the high alloyed grades [1][2][3][4][5][6][7][8][9][10], due to their high content of alloying elements (mainly Cr and Mo). On the other hand, lean DSS have been found to be affected only by nitrides formation [7].…”

Section: Introductionmentioning

confidence: 99%

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σ-Phase in Lean Duplex Stainless Steel Sheets

Breda

Pellizzari

Frigo³

2015

Acta Metall. Sin. (Engl. Lett.)

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The precipitation kinetics of secondary phases in two austeno-ferritic lean duplex stainless steels (lean DSS) were examined after aging the materials at 800°C. Owing to the instability of ferrite, all DSS are known to be sensitive to solid-state phase transformations in the critical temperature range 600-1,000°C and different secondary phases may form, depending on composition and microstructure. The performed thermodynamic simulations revealed the proneness to the precipitation of such phases also have been done in lean DSS, but only information on the equilibrium microstructures were achieved. Therefore, the materials were aged at various times, in order to verify the simulations and determine the precipitation kinetics. The occurred structural modifications were observed and quantified by scanning electron microscope and X-ray diffraction measurements, determining phase type, composition and volumetric fraction. At 800°C, grade 2101 was found to be only affected by Cr 2 N nitrides precipitation, whereas a significant amount of r-phase was found to form in LDX 2404 for treatment longer than 1 h, almost totally replacing ferrite after 50 h. Up to now, the intermetallic r-phase has been observed only in the high alloyed DSS, and the unexpected precipitation in grade 2404 highlighted that the increased content of molybdenum in this steel might be considered as determinant for the formation.

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Microwave dielectric properties of temperature-stable (Mg0.95Co0.05)2TiO4–Li2TiO3 composite ceramics for LTCC applications

Lai

et al. 2017

J Mater Sci: Mater Electron

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Effects of B-site substitution and annealing on the structural and microwave dielectric properties of CaTiO3 ceramics

Cited by 11 publications

References 22 publications

Investigation of the compaction behavior of carbon fiber NCF for continuous preforming processes

Investigation of the compaction behavior of carbon fiber NCF for continuous preforming processes

σ-Phase in Lean Duplex Stainless Steel Sheets

Microwave dielectric properties of temperature-stable (Mg0.95Co0.05)2TiO4–Li2TiO3 composite ceramics for LTCC applications

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