Temperature Effect on Young's Modulus of Boron Nitride Sheets

2013 ◽  
Vol 36 (2) ◽  
pp. 152-159 ◽  
Author(s):  
M. Mirnezhad ◽  
R. Ansari ◽  
A. Shahabodini
Keyword(s):  
Boron Nitride ◽  
Temperature Effect ◽  
Young’S Modulus ◽  
Young's Modulus

scholarly journals Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Philipp Bolz ◽  
Philipp Drechsel ◽  
Alexey Prosvetov ◽  
Pascal Simon ◽  
Christina Trautmann ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Young’S Modulus ◽  
Radiation Effects ◽  
Large Scale ◽  
Hexagonal Boron Nitride ◽  
Young's Modulus ◽  
Target Surface ◽  
High Dose ◽  
Velocity Signal ◽  
Isotropic Graphite

Targets of isotropic graphite and hexagonal boron nitride were exposed to short pulses of uranium ions with ∼1 GeV kinetic energy. The deposited power density of ∼3 MW/cm³ generates thermal stress in the samples leading to pressure waves. The velocity of the respective motion of the target surface was measured by laser Doppler vibrometry. The bending modes are identified as the dominant components in the velocity signal recorded as a function of time. With accumulated radiation damage, the bending mode frequency shifts towards higher values. Based on this shift, Young’s modulus of irradiated isotropic graphite is determined by comparison with ANSYS simulations. The increase of Young’s modulus up to 3 times the pristine value for the highest accumulated fluence of 3 × 1013 ions/cm2 is attributed to the beam-induced microstructural evolution into a disordered structure similar to glassy carbon. Young’s modulus values deduced from microindentation measurements are similar, confirming the validity of the method. Beam-induced stress waves remain in the elastic regime, and no large-scale damage can be observed in graphite. Hexagonal boron nitride shows lower radiation resistance. Circular cracks are generated already at low fluences, risking material failure when applied in high-dose environment.

Micromechanical characterization of chemically vapor deposited ceramic films

1994 ◽  
Vol 9 (8) ◽  
pp. 2072-2078 ◽  
Author(s):  
J.M. Grow ◽  
R.A. Levy
Keyword(s):  
Silicon Carbide ◽  
Silicon Nitride ◽  
Boron Nitride ◽  
Silicon Dioxide ◽  
Boron Carbide ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Ceramic Films ◽  
Chemically Vapor Deposited ◽  
Micromechanical Characterization

In this study, nanoindentation is used to determine Young's modulus of chemically vapor deposited films consisting of silicon carbide, silicon nitride, boron carbide, boron nitride, and silicon dioxide. Diethylsilane and ditertiarybutylsilane were used as precursors in the synthesis of the silicon-based material, while triethylamine borane complex was used for the boron-based material. The modulus of these films was observed to be dependent on the processing conditions and resulting composition of the deposits. For the silicon carbide, silicon nitride, boron carbide, and boron nitride films, the carbon content in the films was observed to increase significantly with higher deposition temperatures, resulting in a corresponding decrease in values of Young's modulus. The composition of the silicon dioxide films was near stoichiometry over the investigated deposition temperature range (375–475 °C) with correspondingly small variations in the micromechanical properties. Subsequent annealing of these oxide films resulted in a significant increase in the values of Young's modulus due to hydrogen and moisture removal.

scholarly journals Note on the influence of temperature on the rigidity of metals

1920 ◽  
Vol 97 (687) ◽  
pp. 450-455
Keyword(s):  
Temperature Effect ◽  
Young’S Modulus ◽  
Test Piece ◽  
Young's Modulus ◽  
Narrow Strip ◽  
Influence Of Temperature ◽  
Complex Constant ◽  
Fine Wire ◽  
Influence Of Temperature On ◽  
Series Of Experiments

In these ‘Proceedings,’ I described some experiments on the influence of temperature on the value of Young’s Modulus for various metals. The results showed that the more fusible the metal, the greater was the variation of the modulus with temperature, and suggested that, roughly, the decrement of the modulus for a given rise of temperature was equal to the ratio of the modulus at absolute zero to the melting temperature and a constant ( i. e. d M/ dθ = M 0 /( θ n + θ ')). Since Young’s Modulus is a complex constant, involving both rigidity and volume elasticity, it seemed worth while to examine the temperature effect on rigidity alone, and with this object in view I have recently carried out a further series of experiments on most of the metals previously tested. The apparatus used was a torsion-balance, shown diagrammatically in fig. 1. A vertical rod, A, is suspended by a long fine wire, B, and the test piece, C, in the form of a wire or narrow strip of plate, is clamped to the lower end of A, and also to the fixed support, D. The whole of this part of the balance can be immersed in a bath of fluid at any required temperature.

Young’s modulus and density of nanocrystalline cubic boron nitride films determined by dispersion of surface acoustic waves

2002 ◽  
Vol 74 (1) ◽  
pp. 41-45 ◽  
Author(s):  
G. Lehmann ◽  
P. Hess ◽  
S. Weissmantel ◽  
G. Reisse ◽  
P. Scheible ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Young’S Modulus ◽  
Acoustic Waves ◽  
Young's Modulus ◽  
Cubic Boron Nitride ◽  
Surface Acoustic Waves ◽  
Boron Nitride Films

Effect of aspects ratio on Young’s modulus of boron nitride nanotubes: A molecular dynamics study

2020 ◽  
Vol 26 ◽  
pp. 1-4 ◽  
Author(s):  
V.K. Choyal ◽  
Vijay Choyal ◽  
Subhash Nevhal ◽  
Ajeet Bergaley ◽  
S.I. Kundalwal
Keyword(s):  
Molecular Dynamics ◽  
Boron Nitride ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Boron Nitride Nanotubes

scholarly journals The Effect of Boron Nitride on the Thermal and Mechanical Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 940 ◽  
Author(s):  
Mualla Öner ◽  
Gülnur Kızıl ◽  
Gülşah Keskin ◽  
Celine Pochat-Bohatier ◽  
Mikhael Bechelany
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Boron Nitride ◽  
Young’S Modulus ◽  
Mechanical Performance ◽  
Young's Modulus ◽  
Filler Concentration ◽  
Gravimetric Analysis ◽  
Thermal And Mechanical Properties ◽  
Scanning Calorimetry

The thermal and mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate, PHBV) composites filled with boron nitride (BN) particles with two different sizes and shapes were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), thermal gravimetric analysis (TGA) and mechanical testing. The biocomposites were produced by melt extrusion of PHBV with untreated BN and surface-treated BN particles. Thermogravimetric analysis (TGA) showed that the thermal stability of the composites was higher than that of neat PHBV while the effect of the different shapes and sizes of the particles on the thermal stability was insignificant. DSC analysis showed that the crystallinity of the PHBV was not affected significantly by the change in filler concentration and the type of the BN nanoparticle but decreasing of the crystallinity of PHBV/BN composites was observed at higher loadings. BN particles treated with silane coupling agent yielded nanocomposites characterized by good mechanical performance. The results demonstrate that mechanical properties of the composites were found to increase more for the silanized flake type BN (OSFBN) compared to silanized hexagonal disk type BN (OSBN). The highest Young’s modulus was obtained for the nanocomposite sample containing 1 wt.% OSFBN, for which increase of Young’s modulus up to 19% was observed in comparison to the neat PHBV. The Halpin–Tsai and Hui–Shia models were used to evaluate the effect of reinforcement by BN particles on the elastic modulus of the composites. Micromechanical models for initial composite stiffness showed good correlation with experimental values.

Sign in / Sign up

Export Citation Format

Share Document