... The wake fracture process zone (FPZ) of an alumina WL-DCB specimen subjected to cyclic loading at room temperature to 800°C was analyzed by a hybrid experimental-numerical procedure involving phase-shifting moiré interferometry and finite element analysis. A residual crack opening profile...

..., and worthwhile for standardization. Therefore, a recommended practice has been written that is now serving as basis for a new CEN standard. Fracture toughness advanced technical ceramics alumina silicon nitride silicon carbide zirconia single-edge-V-notched beam razor blade diamond paste flexure...

... The lower wear rate obtained with bulk alumina femoral hip balls compared to cobalt-chromium alloy balls on ultra-high molecular weight polyethylene is well documented in clinical studies. An alumina coating on a cobalt-chrome component would produce the superior surface properties...

... Low-frequency mechanical spectroscopy measurements were performed in fine-grained zirconia and alumina. In both cases, anelastic relaxation phenomena at high temperature (>1200 K) have been observed, which are found to be in close correlation with the creep behavior. More precisely, a more...

... interfacial reactions between thermally stable compounds and ceramic substrates such as zirconia and alumina. This interaction is pivotal in understanding the mechanism of high temperature lubricity. The approach consisted of selecting low sublimation temperature materials and measuring their thermodynamic...

..., as a consequence, the effects of damage processes and residual stresses on the strength of ceramics can be quantified by the methods of fracture mechanics. Typical case studies will be discussed in which different grinding and lapping procedures are applied to specimens of silicon nitride and alumina...

... whiskers in A1 2 O 3 matrix, K Id s and K Ib s of Al 2 O 3 and SiC w /Al 2 O 3 were about the same, suggesting that the SiC whiskers are not effective in dynamic fracture. dynamic fracture impact damage spallation alumina silicon-carbide whiskers ceramic composite Lyle R. Deobald 1...

... The so-called improved temperature-controlled irradiation was attempted at 1073 K with an electrical heater in a water cooled fission reactor and alumina-magnesia ceramics were irradiated. They were sintered from the highly pure powders without sintering-aid agents. Preliminary results indicated...

... in a closed loop at 37°C. The fatigue load was applied on the head in 15°C mediolateral anatomic orientation. The functional capabilities of this setup was demonstrated by testing alumina ceramic and cobalt-chromium-molyb-denum femoral heads fitted on titanium alloy tapers, at a fatigue load of 5.34 kN...

... Unlubricated sliding wear tests were carried out on an alumina ceramic with different loading systems. The experiments were aimed at determining if altering the mechanical response of the test system would change the wear and friction observed. A variation of nearly two orders of magnitude...

... Eleven U.K. laboratories performed dry pin-on-disk wear tests on a 95% alumina ceramic under a load of 40 N and at a sliding speed of 0.1 ms -1 . Specimens were supplied with polished and ground finishes; the ground finish gave higher wear and lower friction than the polished specimens...

... Chevron-notched specimens were used to test metallic and ceramic materials over a range of temperatures and testing conditions. The materials tested were M-50 bearing steel, alumina, silicon carbide, monolithic silicon nitride, and in situ toughened silicon nitride. Results were compared...

... crack growth testing of brittle matrices used in these composites. The specimen compliance is monitored using the laser interferometric displacement gage system. To evaluate this fatigue crack growth test setup, cyclic crack propagation is studied in an alumina ceramic specimen. Transmission electron...

... for the cohesive crack is obtained through micromechanical considerations and experimental observations in the crack wake. The model predictions show good agreement with experimental results in one monolithic ceramic (alumina) and two fibeoreinforced ceramic-matrix composites. The applications and limitations...

... fluence for the a-axis oriented samples. ceramics alumina ion implantation mechanical properties sapphire Al 2 O 3 Michael E. O'Hern, ~Laurence J. Romana, z Carl J. McHargue, 3 Jeff C. McCallum, 4 and Clark W. White 3 The Effect of Crystal Orientation on Damage Accumulation in Chromium...

... The microstructure of magnesium aluminate spinel (MgAl 2 O 4 ) and alumina (Al 2 O 3 ) has been examined with transmission electron microscopy following ion irradiation to damage levels of 0.1 to 5 keV/atom (1 to 50 dpa) at room temperature and 650°C. The ion irradiation produced interstitial...

.... computed tomography X-ray tomographic microscopy nondestructive evaluation damage metal matrix composites aluminum titanium titanium aluminide nickel aluminide silicon carbide alumina Stuart R. Stock, ~ Thomas M. Breunig, 1Abbas Guvenilir, l John H. Kinney, 2 and Monte C. Nichols 3...

... Joining with ceramic materials is one of the important subjects in the application of vanadium for the fusion environment. In order to develop and understand the solid-state bonding of vanadium with oxide ceramics, conditions of diffusion bonding between vanadium and alumina were examined...

... to define the materials pair. Sample preparation, selection of load and speed, environmental control, and contamination effects are crucial to the meaningful tribological evaluation of ceramic materials. Specific examples are given using a modified four-ball wear tester with alumina specimens. alumina...

... We prepared films of alumina, zirconia and hafnia by Chemical Vapor Deposition (CVD) for evaluation as high refractive index optical components for high power laser applications. Films with high index of refraction (1.89-1.63) but with rather low single shot laser damage thresholds (4–10 J/cm -2...