Six types of diamond-like carbon (DLC) coatings with zirconium (Zr)-containing interlayers on titanium alloy (Ti-6Al-4V) were investigated for improving the biotribological performance of orthopedic implants. The coatings consist of three layers: above the substrate a layer stack of 32 alternating Zr and ZrN sublayers (Zr:ZrN), followed by a layer comprised of Zr and DLC (Zr:DLC), and finally a...

A 16-channel 200 GHz arrayed-waveguide grating (AWG) (de)-multiplexer is demonstrated experimentally by utilizing Si3N4 buried optical waveguides, which have 50 nm-thick Si3N4 cores and a 15 μm-thick SiO2 cladding. The structure with an ultra-thin core layer helps to reduce the scattering due to the sidewall roughness and consequently shows very low loss of about 0.4~0.8 dB/m. When using this t...

In this work a novel, high quality, high-density, 100% yield, deposited at room temperature ultra thin 5nm Si3N4 Metal Insulator Metal (MIM) capacitor process for Monolithic Millimetre-wave Integrated Circuits (MMMICs) applications is demonstrated using inductively coupled plasma enhanced chemical vapor deposition technique (ICP-CVD). Capacitance of 6.7fF/μm and a breakdown electric field of mo...

The choice of ceramic-on-ceramic coupling in total hip prosthesis has advantages over couplings with other combinations materials that use polyethylene and metal terms high hardness, scratch resistance, low wear rate, increased lubrication performance. To reduce the risk primary postoperative failure, selection ceramic for is a strategic step needs to be taken. current study aims analyze common...

Silicon nitride–zirconia–graphene composites with high graphene content (5 wt.% and 30 wt.%) were sintered by gas pressure sintering (GPS). The effect of the multilayer (MLG) on microstructure fracture mechanism is investigated multi-scale in-situ microscopy. Multi-scale microscopy confirms that phases disperse evenly in without obvious agglomeration. MLG flakes well dispersed between ceramic m...

The effect of residual stresses on the strength, toughness and work of fracture of Si3N4/SiC multilayered composites with different SiC layers has been investigated. It may be an effective way to design and optimize the mechanical properties of Si3N4/SiC multilayered composites by controlling the properties of SiC layers. Si3N4/SiC multilayered composites with different SiC layers were fabricat...

The ceramic samples fabricated by spark plasma sintering of powder mixtures based on silicon nitride (Si3N4) were investigated. made wet chemical methods from commercial α-Si3N4 (the particle size <5 μm) and Y2O3-Al2O3 additive (3% to 10% wt.). Sintering was carried out at the heating rate 50 °C/min load 70 MPa until shrinkage end. characterized scanning electron microscopy X-ray diffraction...

In the present study, friction and wear behaviors of Si3N4-hBN(Hexagonal boron nitride) ceramic composites against polyether-etherketone in artificial seawater were investigated, sliding speed was varied from 0.52 to 1.73 m/s study effect. It found that coefficients rates decreased with increase for Si3N4-hBN (with hBN content ranging 5% 20%) PEEK(Polyether-ether-ketone); pairs represented an u...

Dealing with high-temperature properties and brittleness is always one of the hot topics in field ceramic materials. Extensive research has been carried out for it Si3N4-SiC composites are most promising composites. In this study, impact Si3N4 BN reinforcement on microstructure physio-mechanical SiC-based were explored. Two sets composites, including BN-Si3N4-SiC aided Al2O3, fabricated using n...

The microstructure and phase composition of the high-content Al2O3-Y2O3-doped spark plasma-sintered silicon nitride were investigated. Fully dense silicon nitride ceramics with a typical α-Si3N4 equiaxed structure with average grain size from 200 to 530 nm, high elastic modulus of 288 GPa, and high hardness of 2038 HV were spark plasma sintered (SPSed) at 1550 °C. Silicon nitride with elongated...