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Journal of Ceramic Science and Technology 4/2018
Vol. 9, No. 4 · December 2018
Estimation of fiber/matrix interfacial friction coefficient in continuous fiber-reinforced ceramic-matrix composites at room and elevated temperatures under cyclic loading
L. Li
Pages 371-380 · DOI: 10.4416/JCST2018-00015
In this paper, the fiber/matrix interfacial frictional coefficient of continuous fiber-reinforced ceramic-matrix composites (CMCs) at room and elevated temperatures have been investigated. The fatigue hysteresis loops models considering the fiber/matrix interface friction between fibers and the matrix have been developed to establish the relationships between the fatigue hysteresis loops, fatigue hysteresis dissipated energy and fiber/matrix interface frictional coefficient. Using the experimental fatigue hysteresis dissipated energy, the fiber/matrix interface frictional coefficient of SiC/Si …
Novel Cement-Ceramic Encapsulation Material for Electronic Packaging
S. Kaessner, S. Kaessner, N. Wichtner, F. Hueller, C. Berthold, K. G. Nickel
Pages 381-390 · DOI: 10.4416/JCST2018-00024
Future power electronic devices with high power density and reduced chip area need robust encapsulation materials with increased thermal conductivity and temperature stability. Especially for new SiC and GaN semiconductor technology, operating temperatures above 200 °C can increase the potential of future power electronics. This paper introduces a novel uniquely processed cement-ceramic composite material for electronic packaging, containing a calcium aluminate cement (CAC) matrix and high amounts of alumina fillers. In-situ µ-XRD²-DTA, where X-ray diffraction patterns and DTA traces can be mo …
In the late 1960s, strong interest grew in studying various types of ceramics as potential bone grafts thanks to their suitable biomechanical properties. A bit later, such synthetic biomaterials were termed bioceramics. Since then, there has been a number of important achievements in this field. Namely, after the initial development of bioceramics that were just tolerated in the physiological environment, emphasis was shifted towards those able to form direct chemical bonds with the adjacent bones and tissues. Afterwards, based on selection of the appropriate chemical composition coupled with …
Effect of Different Acid Treatments on the Shear Bond Strength of Computer-Aided Design and Manufacturing (CAD-CAM) Ceramics for Dental Applications
G. Yildirim
Pages 391-396 · DOI: 10.4416/JCST2018-00031
The purpose of this in vitro study was to compare the shear bond strengths (SBS) of hybrid ceramic; Vita Enamic (VE), zirconia-reinforced lithium silicate ceramic; Vita Suprinity (VS), feldspathic ceramic; Vita TriLuxe forte (VT), and lithium disilicate ceramic; IPS e.max CAD (IPS). Eighty specimens were prepared from four different CAD-CAD ceramic materials. The CAD-CAM ceramic specimens were randomly divided into two subgroups according to acid types: phosphoric (P) acid and hydrofluoric (HF) acid. Resin cement (Panavia V5; Kuraray, Japan) was applied using a 3 x 3-millimeter mold. All speci …
Effect of interface oxidation on matrix multi-cracking evolution of fiber-reinforced ceramic-matrix composites at elevated temperature
L. Li
Pages 397-410 · DOI: 10.4416/JCST2018-00032
In this paper, the effect of fiber/matrix interface oxidation on matrix multi-cracking evolution of fiber-reinforced ceramic-matrix composites (CMCs) is investigated using the critical matrix strain energy (CMSE) criterion. The shear-lag model combined with the fiber/matrix interface oxidation model and fiber/matrix interface debonding criterion is adopted to analyze the fiber and matrix axial stress distribution inside of the damaged composite. The relationships between matrix multi-cracking, fiber/matrix interface debonding and oxidation are established. The effects of fiber volume fraction, …
Antioxidant Coating Composed of SiC on Carbon Fibers by Chemical Vapor Reaction
J. Hao, J. Hao, J. Li, J. Li, W. Shi, W. Shi, W. Shi, Y. Tan, Y. Tan, X. Ding
Pages 465-470 · DOI: 10.4416/JCST2018-00033
A silicon carbide (SiC) coating was prepared on the surface of carbon fibers by means of chemical vapor reaction (CVR) at different temperature. The phase, microstructure and oxidation behavior of the SiC coating prepared from 1 723 to 1 923 K were investigated. The SiC coating becomes thicker and the SiC grains grow with the increase in reaction temperature. The oxidation resistance of carbon fibers can be improved significantly by the SiC coating, and the oxidation resistance of the carbon fibers increases as the reaction temperature increases. The initial oxidation temperature of the SiC-co …
Novel Low-Permittivity, Low-Sintering-Temperature Na2WO4 Microwave Dielectric Ceramics for LTCC Applications
H.L. Dong, H.L. Dong, C.X. Hu, C.X. Hu, W.J. Wang, H.P. Bao, W.J. Liu, B. Yang, B. Yang
Pages 471-476 · DOI: 10.4416/JCST2018-00034
A novel Na2WO4 ceramic with low sintering temperature was successfully synthesized by means of the reactive sintering process. The phase composition, microstructure and microwave dielectric properties of the Na2WO4 dielectric ceramic with different sintering temperature (600, 650, 680 and 700 °C) were investigated in detail using X-ray diffraction (XRD), scanning electron microscopy (SEM) and a vector network analyzer, respectively. Excellent microwave dielectric properties with a relative permittivity (εr) ∼ 3.45, a quality factor (Q×f) ∼ 38 244 GHz (at 13.64 GHz) and a temperature coefficien …
Low-Temperature Spark Plasma Sintering of a SiC Nanopowder with a Very Thin Al-Based Layer
K. Shimoda
Pages 411-418 · DOI: 10.4416/JCST2018-00035
A SiC nanopowder with an Al-based layer synthesized by means of laser pyrolysis was used to fabricate bulk SiC using spark plasma sintering (SPS) at 1600 – 1800 °C. The surface structure of the novel SiC nanopowder was analyzed by means of field-emission scanning/transmission electron microscopy (FE-SEM/TEM), while the surface chemistry was characterized using X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDS). The average particle size was around 45 nm with a very thin (
Effects of Aging Time on Microstructure, Hydrophobic and Optical Properties of BiFeO3 Thin Films Synthesized via Sol-Gel Method
H. Baqiah, Z.A. Talib, A.H. Shaari, M. M. Awang Kechik, J.Y.C. Liew, N.B. Ibrahim
Pages 419-426 · DOI: 10.4416/JCST2018-00039
BiFeO3 (BFO) films were synthesized with the sol-gel method followed by the spin coating technique using 2-methoxyethanol as solvent and acetylacetone as chelating agent. The effects of aging time (t = 0, 1, 3, 6 days) of the BFO sol on the microstructure, wettability and optical properties of BFO films were investigated by means of X-ray diffraction (XRD), atomic force microscopy (AFM), contact angle (CA) measurement, Uv-vis and photoluminescence. The crystallinity of films was affected by t. Crystallite size of the films changed slightly in the range of 14.2 – 15.2 nm while the lattice param …
Preparation of Si-C-O Ceramic Fibers from Commercial Silicon Resin
H. Li, Y. Gou, H. Wang, K. Jian
Pages 427-434 · DOI: 10.4416/JCST2018-00040
Si-C-O ceramic fibers were prepared from commercial silicon resin by means of melt spinning, UV curing and pyrolysis. The composition and structure of the precursors were characterized with FT-IR and NMR. Silicon resin exhibited excellent spinning performance for use as a precursor to prepare continuous fibers. UV irradiation was employed to complete the cross-linking of the green fibers, and the mechanism of the curing process was determined with FT-IR. After pyrolysis at 1 000 °C, Si-C-O ceramic fibers were obtained, which exhibited good flexibility with 7.5 μm in diameter and 0.8 GPa in ten …
Synergistic Effects of Loading Sequences and Phase Angles on Thermomechanical Fatigue Damage Evolution of Silicon-Carbide-Fiber-Reinforced Ceramic-Matrix Composites
L. Li
Pages 435-464 · DOI: 10.4416/JCST2018-00049
In this paper, the synergistic effects of loading sequences and phase angles on the thermomechanical fatigue (TMF) damage evolution of silicon-carbide-fiber-reinforced ceramic-matrix composites (SiC–CMCs) are investigated. Mechanisms-based micromechanical TMF damage models using the hysteresis-based damage parameters are developed to describe the internal damage development of fiber-reinforced CMCs. Relationships between the damage evolution (i.e. TMF hysteresis dissipated energy, hysteresis modulus and peak strain), loading sequences (i.e. constant peak stress loading, low–high peak stress lo …
