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Dattatraya P. Dandekar - One of the best experts on this subject based on the ideXlab platform.

  • Shear strengths of Aluminium Nitride and titanium diboride under plane shock wave compression
    2015
    Co-Authors: Dattatraya P. Dandekar
    Abstract:

    Resume- On fait la comparaison des estimations des contraintes en paralleles la nitrure de l'alumnium et la diborure de titane obtenues (a) par des measures simultanees de contraintes longitudinales et laterales par moyen d'u indicateurs manganins sous engagement d'un choque d'ondulation plane (b) avec ceux calcules des declenchements entre le hydrodynamique et le choque Hugonoit de ces materiaux. Le resultat de ce travail fait voir que quoique les estimees des contraintes en paralleles obtenues par ces deux methodes pour le diboure de titane sont les memes pour le diboure, ceux de la niawe de l'Aluminium ne le sont pas. Ceci est au moins partiellement attribue ' a la inconsistence observe entre les mesures simultanees des contraintes longitudinales et laterales dans la nitrure d'Aluminium. Abstract- This work compares the estimates of shear strengths of Aluminium Nitride and titanium diboride obtained (a) from the simultaneous measurements of longitudinal and lateral stress by means of manganin gauges under plane shock wave loading with (b) those calculated from the offset between hydrodynamic and shock Hugoniot of these materials. The results of this work show that whereas the estimates of the shear strength obtained by these two methods for titanium diboride are consistent with one another, those of Aluminium Nitride are not. This is at least partly due to the observed inconsistency between the simultaneous measurements of longitudinal and lateral stresses in Aluminium Nitride. 1

  • Shear strengths of Aluminium Nitride and titanium diboride under plane shock wave compression
    Le Journal de Physique IV, 1994
    Co-Authors: Dattatraya P. Dandekar
    Abstract:

    This work compares the estimates of shear strengths of Aluminium Nitride and titanium diboride obtained (a) from the simultaneous measurements of longitudinal and lateral stress by means of manganin gauges under plane shock wave loading with (b) those calculated from the offset between hydrodynamic and shock Hugoniot of these materials. The results of this work show that whereas the estimates of the shear strength obtained by these two methods for titanium diboride are consistent with one another, those of Aluminium Nitride are not. This is at least partly due to the observed inconsistency between the simultaneous measurements of longitudinal and lateral stresses in Aluminium Nitride

Patrick Weisbecker - One of the best experts on this subject based on the ideXlab platform.

  • Pressureless sintered silicon carbide tailored with Aluminium Nitride sintering agent
    Journal of the European Ceramic Society, 2012
    Co-Authors: Antoine Malinge, Aurélie Coupé, Stéphane Jouannigot, Yann Le Petitcorps, René Pailler, Patrick Weisbecker
    Abstract:

    Abstract This study reports the influence of Aluminium Nitride on the pressureless sintering of cubic phase silicon carbide nanoparticles (β-SiC). Pressureless sintering was achieved at 2000 °C for 5 min with the additions of boron carbide together with carbon of 1 wt% and 6 wt%, respectively, and a content of Aluminium Nitride between 0 and 10 wt%. Sintered samples present relative densities higher than 92%. The sintered microstructure was found to be greatly modified by the introduction of Aluminium Nitride, which reflects the influence of nitrogen on the β-SiC to α-SiC transformation. The toughness of sintered sample was not modified by AlN incorporation and is relatively low (around 2.5 MPa m 1/2 ). Materials exhibited transgranular fracture mode, indicating a strong bonding between SiC grains.

J.c. Labbe - One of the best experts on this subject based on the ideXlab platform.

  • Aluminium Nitride–molybdenum ceramic matrix composites: influence of molybdenum concentration on the mechanical properties
    Journal of Materials Science, 1997
    Co-Authors: Amir Azam Khan, J.c. Labbe
    Abstract:

    Aluminium Nitride–molybdenum ceramic matrix composites are produced by hotpressing a mixture of two powders. Mechanical properties of a series of samples are measured in order to study the effect of molybdenum phase on the behaviour of composite. Three-point bend strength increases from a value of 270 MPa for pure Aluminium Nitride to 571 MPa for a composite containing 40% by volume of metallic phase. Fracture toughness measured by the single-edged precracked beam (SEPB) technique, is also increased as a function of molybdenum concentration. From 2.3 MPam1/2 for pure AlN we obtain a value of 6.9 MPam1/2 in the case of composite containing 40% by volume of metallic phase. This very important increase in the mechanical properties of AIN-Mo composites is attributed to higher mechanical properties of molybdenum and an adherent interface between AIN and Mo grains.

  • Aluminium Nitride-molybdenum ceramic matrix composites : Characterization of ceramic-metal interface
    Journal of the European Ceramic Society, 1996
    Co-Authors: Amir Azam Khan, J.c. Labbe
    Abstract:

    Pure Aluminium Nitride can be hot pressed with an addition of molybdenum powder. With this technique we obtain a ceramic matrix composite having a dispersed metallic phase. Composites produced in this manner present a homogeneous structure with very little open porosity. Electrical resistivity measurements done over a series of composites show a sharp decrease in electrical resistivity when the molybdenum volume fraction in the material increases from 0.2 to 0.22. This value corresponds to the percolation threshold of metallic phase in the ceramic matrix. The interface between molybdenum particles and Aluminium Nitride grains is established through a fine oxide or oxyNitride layer present at the surface of AlN grains.

  • Study of the behaviour of Aluminium Nitride in the iron and steel industry
    Journal of the European Ceramic Society, 1996
    Co-Authors: J.c. Labbe, A. Laïmeche
    Abstract:

    Abstract Reactivity studies of different steels with Nitride ceramics, and in particular with Aluminium Nitride, have shown the presence of complex chemical reactions at the solid-liquid and liquid-vapour interfaces. Reaction at the AlN-liquid steel interface shows a decomposition of AlN followed by the oxidation of Aluminium, and an AlON phase attack at grain boundaries.

D. Averty - One of the best experts on this subject based on the ideXlab platform.

E. Andrade - One of the best experts on this subject based on the ideXlab platform.

  • Aluminium Nitride films prepared by reactive magnetron sputtering
    Journal of Physics D: Applied Physics, 1997
    Co-Authors: Stephen Muhl, Juan Antonio Zapien, Juan Manuel Mendez, E. Andrade
    Abstract:

    The exceptional properties of Aluminium Nitride make this material a very promising candidate for a variety of technological applications. In this paper we report our work on the preparation of thin films of Aluminium Nitride by reactive DC and RF magnetron sputtering. The physical and electrical properties of the films were studied as a function of the preparation conditions: concentration of nitrogen in the reactive gas mixture, the substrate temperature, the plasma power and the horizontal distance from the centre of the target. X-ray diffraction data indicated that highly oriented polycrystalline films could be fabricated. Rutherford backscattering and nuclear reaction analysis showed that nearly stoichiometric films could be prepared using nitrogen concentrations greater than 50%. For the DC plasma process, bombardment of the growing film plays a very significant role. The film growth mechanism was found to be very different for the RF plasma. The nuclear analysis of the films prepared at different lateral distances, together with measurements of the substrate potential, permitted modelling of the film formation process for both the DC and RF plasmas.