A new interface fracture test was developed for ceramic environmental barrier coatings (EBCs) on matrix composites (CMCs). The proposed modifies an existing in order to simplify specimen preparation. An asymmetric double cantilever beam (ADCB) with a stiffener adhering the coating used, and wedge inserted into notch open it. formula calculate toughness using opening load displacement derived; i...

Porcelain enamel is an inorganic-type coating, which applied to metals or glass for both decorative and functional purposes. This coating a silica-based solidified mass obtained by high-temperature firing (temperature can range between 450 1200 °C depending on the substrate). coatings differ from ceramic mainly their structure dilatation coefficient, organic paints inorganic nature of matrix ch...

Ceramic coatings for metallic interconnects play a key role in limiting corrosion and chromium evaporation solid oxide cells. This study presents the upscaling of electrophoretic deposition (EPD) technique to process Mn-Co spinels on real-dimension Crofer 22 APU test SOFC stack. Area specific resistance long-term conducted 5000 h at 850 °C demonstrated that two-steps sintering has significant i...

Since hydroxyapatite has excellent biocompatibility and bone bonding ability, porous hydroxyapatite ceramics have been intensively studied. However, porous hydroxyapatite bodies are mechanically weak and brittle, which makes shaping and implantation difficult. One way to solve this problem is to introduce a strong porous network onto which hydroxyapatite coating is applied. In this study, porou...

In this study, tungsten oxide coatings with 13 and 75 at% of oxygen were prepared by DC reactive magnetron sputtering from a pure W target in an Ar+O2 atmosphere. The coating hardness (H) decreased with increasing oxygen content from 25 to 7.7GPa. The values of H/E ratio were 0.08 and 0.07 for W87O13 and W25O75, respectively. The tribological measurements were carried out on a pin-on-disc tribo...

Al2O3 ceramic reinforced with 4-wt% multiwalled carbon nanotube (CNT) is plasma sprayed for improving the fracture toughness of the nanocomposite coating. Two different methodologies of CNT addition have been adopted in the powder feedstock to assist CNT dispersion in the nano-Al2O3 matrix. First, spray-dried nano-Al2O3 agglomerates are blended with 4 wt% CNT as powder-feedstock, which is subse...

Thermal-sprayed ceramic coatings are widely used in industry due to their favorable mechanical properties. However, traditional prone failure the differences physical properties between bonding coating and coating. In order solve this problem, a continuous transition zone was introduced coating, then air plasma spraying prepare coatings. The Vickers hardness analysis results show that existence...

The purpose of this paper is to study the thermal shock resistance and failure mechanism La2Ce2O7/8YSZ double-ceramic-layer barrier coatings (LC/8YSZ DCL TBCs) under extreme temperature gradients. At high surface temperatures, infrared measuring modules were used determine cycling life insulation LC/8YSZ TBCs gradients by an oxygen–acetylene gas flame testing machine. A viscoelastic model was o...

In this research, tribological behavior of Ti-Ni-P intermetallic coatings on titanium substrates have been investigated under dry reciprocating conditions. Hardness profile testing results exhibit that high surface hardness has been attained and static indentation result shows that the intermetallic coating has better adhesion strength than the conventional ceramic coatings. In this respect, th...