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  • Articles  (30)
  • International Journal of Applied Ceramic Technology  (12)
  • 48686
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (30)
  • Sociology
  • Technology
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  • Articles  (30)
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  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (30)
  • Sociology
  • Technology
  • 1
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    A Novel Polymeric Precursor for Boron Nitride Ceramics: Synthesis, Characterization, and Ceramic Conversion (2016)
    Wiley
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    Publication Date: 2016-07-24
    Description: A new polymeric boron nitride (BN) precursor poly[(phenylamino)borazine] (PPAB) with good melt-processing performance was successfully synthesized by reaction of B-trichloroborazine (TCB), aniline, and N -methylaniline under mild conditions. The as-synthesized PPAB as well as its structural evolution during the ceramic conversion was studied by means of various complementary techniques. The effect of process parameters including monomer ratio, reaction time, and reaction temperature on the properties of polymers was investigated, and the optimized parameters were obtained. Gel permeation chromatography (GPC) analysis of typical PPAB revealed that the number-average molecular weight ( M n ) was 30,520 Da and the polymerization degree was 319. The polymer could be converted to BN ceramics under ammonia atmosphere at 1200°C with carbon content as low as 0.9wt%. The PPAB polymer could be melt-spun into continuous polymer fibers by hand drawing, which could be further transformed into BN ceramic fibers with good quality. The PPAB polymer is promising for applications that require BN precursor with stable melt processability.
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  • 2
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    Microwave Dielectric Properties of (1 − x)(Mg0.95Ni0.05)TiO3–x(Ca0.8Sr0.2)TiO3 Ceramic System With Near-Zero Temperature Coefficient (2012)
    Wiley
    Details
    Publication Date: 2012-04-15
    Description: The microwave dielectric properties of the (1 −  x )(Mg 0.95 Ni 0.05 )TiO 3 – x (Ca 0.8 Sr 0.2 )TiO 3 ceramic system prepared by mixed oxide route have been investigated. The crystal structures and the microstructures of the ceramics were characterized by means X-ray and scanning electron microscopy. The microwave dielectric properties are strongly related to the density and matrix of the specimen. Combination of (Mg 0.95 Ni 0.05 )TiO 3 (ilmenite-type structure) and (Ca 0.8 Sr 0.2 )TiO 3 (perovskite-structured) forms a two-phase system and leads to a near-zero temperature coefficient (τ f ). With increasing x , the quality factor ( Q  ×  f ) decreased and dielectric constant (ε r ) increased. A new microwave dielectric material 0.95(Mg 0.95 Ni 0.05 )TiO 3 –0.05(Ca 0.8 Sr 0.2 )TiO 3 , possessing excellent microwave dielectric properties with a dielectric constant (ε r ) of 21.68, a quality factor ( Q  ×  f ) of 94,000 (GHz) and a temperature coefficient (τ f ) of approximately −5.2 ppm/°C at 1275°C for 4 h, is proposed as a suitable candidate material for microwave applications requiring low dielectric loss.
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  • 3
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    Deposition Rate, Texture, and Mechanical Properties of SiC Coatings Produced by Chemical Vapor Deposition at Different Temperatures (2012)
    Wiley
    Details
    Publication Date: 2012-04-19
    Description: Silicon carbide ( SiC ) coatings were produced on carbon/carbon ( C / C ) composites substrates using chemical vapor deposition (CVD) at different temperatures (1100°C, 1200°C, and 1300°C). The deposition rate was found to increase with deposition temperature from 1100°C to 1200°C. From 1200°C to 1300°C, the deposition rate decreased. SiC coating produced at 1200°C exhibited a strong (111) texture compared with the coatings produced at other temperatures. Both hardness and Young's modulus were also found to be higher in the coating produced at 1200°C. The variation in mechanical properties with the increase in temperature from 1100°C to 1300°C showed a direct correlation with the change in deposition rate and (111) texture. Microstructure analysis shows that the change in CVD temperature leads to the change in grain size, crystallinity, and density of stacking faults of SiC coatings, which appears to have no significant effect on mechanical properties of SiC compared with the texture observed in SiC coating. For the coating deposited at 1200°C, both the hardness and Young's modulus increased gradually from the substrate/coating interface to the top surface. The nonuniformity of mechanical properties along the cross-section of the coating is attributed to the nonuniform microstructure.
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  • 4
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    Microwave Dielectric Properties of (1 − x)(Mg0.95Ni0.05)TiO3–x(Ca0.8Sr0.2)TiO3 Ceramic System With Near-Zero Temperature Coefficient (2012)
    Wiley
    Details
    Publication Date: 2012-03-09
    Description: The microwave dielectric properties of the (1 −  x )(Mg 0.95 Ni 0.05 )TiO 3 – x (Ca 0.8 Sr 0.2 )TiO 3 ceramic system prepared by mixed oxide route have been investigated. The crystal structures and the microstructures of the ceramics were characterized by means X-ray and scanning electron microscopy. The microwave dielectric properties are strongly related to the density and matrix of the specimen. Combination of (Mg 0.95 Ni 0.05 )TiO 3 (ilmenite-type structure) and (Ca 0.8 Sr 0.2 )TiO 3 (perovskite-structured) forms a two-phase system and leads to a near-zero temperature coefficient (τ f ). With increasing x , the quality factor ( Q  ×  f ) decreased and dielectric constant (ε r ) increased. A new microwave dielectric material 0.95(Mg 0.95 Ni 0.05 )TiO 3 –0.05(Ca 0.8 Sr 0.2 )TiO 3 , possessing excellent microwave dielectric properties with a dielectric constant (ε r ) of 21.68, a quality factor ( Q  ×  f ) of 94,000 (GHz) and a temperature coefficient (τ f ) of approximately −5.2 ppm/°C at 1275°C for 4 h, is proposed as a suitable candidate material for microwave applications requiring low dielectric loss.
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  • 5
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    Microwave Dielectric Properties of (1 − x)(Mg0.95Ni0.05)TiO3–x(Ca0.8Sr0.2)TiO3 Ceramic System With Near-Zero Temperature Coefficient (2011)
    Wiley
    Details
    Publication Date: 2011-10-19
    Description: The microwave dielectric properties of the (1 −  x )(Mg 0.95 Ni 0.05 )TiO 3 – x (Ca 0.8 Sr 0.2 )TiO 3 ceramic system prepared by mixed oxide route have been investigated. The crystal structures and the microstructures of the ceramics were characterized by means X-ray and scanning electron microscopy. The microwave dielectric properties are strongly related to the density and matrix of the specimen. Combination of (Mg 0.95 Ni 0.05 )TiO 3 (ilmenite-type structure) and (Ca 0.8 Sr 0.2 )TiO 3 (perovskite-structured) forms a two-phase system and leads to a near-zero temperature coefficient (τ f ). With increasing x , the quality factor ( Q  ×  f ) decreased and dielectric constant (ε r ) increased. A new microwave dielectric material 0.95(Mg 0.95 Ni 0.05 )TiO 3 –0.05(Ca 0.8 Sr 0.2 )TiO 3 , possessing excellent microwave dielectric properties with a dielectric constant (ε r ) of 21.68, a quality factor ( Q  ×  f ) of 94,000 (GHz) and a temperature coefficient (τ f ) of approximately −5.2 ppm/°C at 1275°C for 4 h, is proposed as a suitable candidate material for microwave applications requiring low dielectric loss.
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  • 6
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    Porous Si3N4/SiC Ceramics Prepared via Nitridation of Si Powder with SiC Addition (2013)
    Wiley
    Details
    Publication Date: 2013-10-22
    Description: Porous Si 3 N 4 /SiC ceramics with high porosity were prepared via nitridation of Si powder, using SiC as the second phase and Y 2 O 3 as sintering additive. With increasing SiC addition, porous Si 3 N 4 /SiC ceramics showed high porosity, low flexural strength, and decreased grain size. However, the sample with 20wt% SiC addition showed highest flexural strength and lowest porosity. Porous Si 3 N 4 /SiC ceramics with a porosity of 36–45% and a flexural strength of 107-46MPa were obtained. The linear shrinkage of all porous Si 3 N 4 /SiC ceramics is below 0.42%. This study reveals that the nitridation route is a promising way to prepare porous Si 3 N 4 /SiC ceramics with favorable flexural strength, high porosity, and low linear shrinkage.
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  • 7
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    Dielectric Properties and Applications of Low-Loss (1−x)(Mg0.95Ni0.05)2TiO4-xSrTiO3 Ceramic System at Microwave Frequency (2014)
    Wiley
    Details
    Publication Date: 2014-08-13
    Description: The microwave dielectric properties of conventional solid-state route prepared (1− x )(Mg 0.95 Ni 0.05 ) 2 TiO 4 –xSrTiO 3 ceramic system have been investigated. A two-phase system was confirmed by the X-ray diffraction patterns. (Mg 0.95 Ni 0.05 )TiO 3 was also detected as a second phase in the system. The microwave dielectric properties are strongly related to the density and the morphology of the specimens. The presence of the second phase, however, would cause no significant variation in the dielectric properties of the specimen because it possesses similar properties compared with that of the main phase (Mg 0.95 Ni 0.05 ) 2 TiO 4 . Specimen using 0.93(Mg 0.95 Ni 0.05 ) 2 TiO 4 –0.07SrTiO 3 leads to a good combination of microwave dielectric properties with an ε r of 24.88, a Q × f of 98,400 (at 9.8 GHz) and a τ f value of 1.43 ppm/°C. It is proposed as a candidate dielectric for applications in GPS patch antennas, 3G and 4G passive components. Moreover, an open stub band-pass filter with central frequency of 2.4 GHz was also designed and fabricated employing the proposed dielectric to study its performance. It also showed a substantial reduction in both insertion loss and size in comparison with other dielectrics FR4 and alumina.
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  • 8
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    Gel-Casting Process Derived 3D-Interconnected Porous Carbon/B4C Preform for Reaction-Bonded Boron Carbide Composites (2017)
    Wiley
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    Publication Date: 2017-09-26
    Description: A novel kind of 3D interconnected porous carbon bonded B 4 C preform with flexural strength of about 20MPa is fabricated by gel-casting method. As the control, the B 4 C/C preforms via moulding produced method are fabricated. The B 4 C/C preforms own the same carbon content and almost the same porosity with different moulding method. Compared with the conventional compression moulding produced B 4 C/C preform, the 3D interconnected porous carbon bonded boron carbide preforms afford three-fold advantages in the fabrication of reaction bonded boron carbide (RBBC) composite via the liquid silicon infiltration (LSI) process, including induced formation of continuous SiC-bonded boron carbide skeleton structure, a reduction of the size of residual silicon and prevented the coarsening of ceramic grains as well. As a result, the RBBC composite fabricated by gel-casting appear as a more refined structure resulting in enhanced mechanical properties: the Vickers hardness, flexural strength and fracture toughness of I-GC composites fabricated from 3D-interconnected porous carbon/B 4 C preforms are 19.4±1.3 GPa, 389±17 MPa and 4.37±0.1 MPa·m 1/2 , respectively, which are statistically higher than those of RBBC fabricated by the conventional compression moulding produced B 4 C/C preform. This article is protected by copyright. All rights reserved.
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  • 9
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    Phase evolution and chemical durability of Zr1-xCexO2 (0 ≤ x ≤ 1) ceramics (2018)
    Wiley
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    Publication Date: 2018-01-09
    Description: Ce-doped zirconia ceramics with general stoichiometry of Zr 1- x Ce x O 2 (0 ≤ x ≤ 1) have been obtained by substituting of Ce 4+ for Zr 4+ in ZrO 2 . The phase and microstructure evolutions of the ceramics were investigated and the effects of composition, temperature and pH value on the chemical durability of the ceramics were also studied. The results show that the phase transformation from monoclinic to tetragonal takes place at about x = 0.2 and from tetragonal to cubic at about x = 0.6. It is found that the increase of Ce content and/or sinter temperature promote the phase transformation. The leaching studies show that the normalized leaching rates of Ce (LR Ce ) increase with increasing Ce content. Moreover, LR Ce in acid solution are higher than those in neutral and alkaline solution. After 42 days, LR Ce is 10 -5 ~ 10 -7 g m −2 d −1 under all different leaching conditions, exhibiting their excellent chemical durability. This article is protected by copyright. All rights reserved.
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  • 10
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    Fabrication and Properties of (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 Ceramics and Their Multilayer Piezoelectric Actuators (2016)
    Wiley
    Details
    Publication Date: 2016-10-01
    Description: The lead-free ceramics with nominal composition (Ba 0.85 Ca 0.15 )(Ti 0.9 Zr 0.1 )O 3 (BCTZ) were prepared by a conventional solid-state reaction combined with a liquid precursor mixing method. Structural, dielectric, piezoelectric, and ferroelectric properties of the ceramics were systematically investigated. Excellent electrical properties of T c ~ 101°C, tanδ ~ (0.003–0.05), k p ~ 0.46, d 33 ~ 560 pC/N, P s ~17 μC/cm 2 and a large strain of 0.43% were reproducibly obtained for the BCTZ ceramics. In addition, BCTZ-based monolithic multilayer piezoelectric actuators were successfully fabricated by alternately laminating the claimed piezoelectric ceramics and internal-binder. The actuators show large displacements under low driven voltage. These results highlight that the BCTZ ceramics are excellent candidate for multilayer piezoelectric devices.
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