Tensile Strength of Silicon Nitride Whiskers Synthesized by Reacting Amorphous Silicon Nitride and Titanium Dioxide

Abstract

and the diameter dependence of the strength was investigated. The Si 3 N 4 whiskers had diameters of 0.04 and 0.8 µm and dominant [1011] and [1010] growth directions. Chemical analysis showed that they contained Ti and O impurities. The tensile strength of six Si 3 N 4 whiskers increased from 17 to 59 GPa with decreasing whisker diameter.

Temperature and strain-rate dependent fracture strength of graphene

“…The mechanical properties of nanostructures, especially their stiffness and strength, need to be carefully understood as they can be the key factors in determining the stability and lifetime of many potential NEMS applications. Extensive experimental and numerical simulations have been performed to understand mechanical properties of nanostructures including carbon nanotube ͑CNT͒, 1,2 silicon nanotube ͑SiNT͒, 3 GaN nanotube ͑GaNNT͒, 4 silicon carbide ͑␤-SiC͒ nanowire, 5,6 silicon nitride ͑␣-Si 3 N 4 ͒ nanowire, 7 Gold nanowire, 8,9 Pd-Pt nanowire, 10 and glass silica nanowire. 11 The ultimate strength of these nanostructures have been measured or calculated to be 11-83 GPa for CNT, 7-10 GPa for SiNT, 18-66 GPa for GaNNT, 17-110 GPa for ␤-SiC, GPa for ␣-Si 3 N 4 , 2-8 GPa for gold nanowires, 8-18 GPa for Pd-Pt nanowires and 9-26 GPa for glass silica nanowires.…”

Synthesis of TiN/Si3N4 composite powders by mechanically activated annealing

“…1 Application of the monolithic material is generally limited by a low toughness, which produces lifetime and reliability problems that are difficult to solve. [3][4][5] More recently, the synthesis of Si 3 N 4 nanowires has received extensive attention for its interesting properties (high strength with good flexibility) and potential applications in the fields of nanoelectronics and nanomechanics. However, as has been shown, increasing the fracture toughness of the monolithic ceramic requires a bimodal microstructure composed of fine matrix grains and a few large, elongated ␤-Si 3 N 4 grains.…”

Surface morphology of silica nanowires at the nanometer scale

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IntroductionSurface quality has been recognized to be a fundamental limitation to mechanical strength and optical transmission, particularly for submicrometric structures.Mechanical properties of nanowires are known to improve significantly for decreasing diameters [1][2][3][4][5][6][7][8][9]. Materials with high specific ultimate strength σ ρ (ratio between strength and density) are highly desirable because they could have radical implications in extreme engineering applications like aerospace structural materials, wind turbines, powerboats, suspended bridges or even more futuristic applications like the space elevator.

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