Surface Modification of Silicon Nano Mechanical Structures by Carbon Ion Implantation for Post-fabrication Transformation to Silicon Carbide

2005 ◽  
Vol 908 ◽  
Author(s):  
Kumar R Virwani ◽  
Dinesh K Sood ◽  
Robert G Elliman ◽  
Ajay P Malshe
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Surface Modification ◽  
Chemical Composition ◽  
Ion Implantation ◽  
Bending Strength ◽  
Internal Stresses ◽  
Carbon Ions ◽  
Carbon Ion ◽  
Unique Ability

AbstractInternal stresses can cause de-lamination and fracture of coatings and structures and it is well known that ion-implantation can be used to control such behavior through modification of the stress. Here, however, we show that the unique ability of implantation to create controlled stresses in materials by altering both the chemical composition and mechanical properties, combined with an increase in the bending strength of materials, can used to create novel vertical nanostructures. Silicon cantilevers (beams), 193nm thick, 200nm wide and 3μm long, were implanted with carbon ions to create a buried SiCx layers. The internal stresses generated by implantation caused the beams to bend at angles ranging from 10 degrees to greater than 90 degrees, leading to unique vertical nanostructures. This method can be used to create 3-D nano electromechanical systems (NEMS).

Physic-Mechanical Properties of Composites Based on Secondary Polypropylene and Dispersed of Plant Waste

2020 ◽  
Vol 1006 ◽  
pp. 227-232
Author(s):  
Yuliya Danchenko ◽  
Artem Kariev ◽  
Vladimir Lebedev ◽  
Elena Barabash ◽  
Tatyana Obizhenko
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Wood Flour ◽  
Chemical Properties ◽  
Uniform Structure ◽  
Internal Stresses ◽  
Agricultural Plants ◽  
Oat Husk ◽  
Filled Composite ◽  
Properties Of Composites

The physic-mechanical properties of filled composites based on secondary polypropylene are investigated. As fillers the dispersed wastes of processing of agricultural plants - buckwheat and oat husk, as well as needles flour and wood flour were used. Water absorption, abrasion, impact strength and bending strength of composites were investigated. It has been proven that oat and buckwheat husks can be effectively used in composites based on secondary polypropylene and replace traditional wood fillers. It has been shown that the physic-chemical properties of the filled composites depend on the structure and physicochemical interactions on the phase separation surface, as well as on the surface properties of the filler particles. It is established that for the production of filled composites with improved physic-mechanical characteristics it is necessary to use fillers with small specific surface and concentration of surface functional groups, and the acid-base characteristic of the surface should be closer to neutral. It is shown that these conditions provide for the formation of a uniform structure of the filled composite with less internal stresses.

Mechanical Properties of α- and β-SiAlON Composite Ceramics Using β-SiAlON Powder

2008 ◽  
Vol 403 ◽  
pp. 111-114 ◽  
Author(s):  
Kei Asakoshi ◽  
Junichi Tatami ◽  
Katsutoshi Komeya ◽  
Takeshi Meguro ◽  
Masahiro Yokouchi
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Rare Earth ◽  
Chemical Composition ◽  
Metal Oxides ◽  
Bending Strength ◽  
Rare Earth Oxide ◽  
Composite Ceramics ◽  
Oxide Powders ◽  
Sialon Powder

β-SiAlON powder was used as a raw powder to fabricate α/β-SiAlON composite ceramics with different rare earth elements. The phases present in the sample fabricated from -SiAlON, α-Si3N4, AlN, and rare earth oxide powders were - and -SiAlONs. The composition was dependent on the chemical composition and firing profile. The sample obtained by adding Yb2O3 had a high -SiAlON content. The /-SiAlON composite ceramics had high densit. Their microstructures depended on the used metal oxides, namely, the addition of Nd2O3 and CaCO3 resulted in the elongation of the -SiAlON grains. The bending strength, fracture toughness, and hardness were influenced by the -SiAlON content, amount of elongated grains, and density of the sample.

Effects of Low Energy Carbon Ion Implantation on the Material Properties of InAs/GaAs Quantum Dots with Variation in Capping Layer

2015 ◽  
Vol 1743 ◽  
Author(s):  
S. Upadhyay ◽  
A Mandal ◽  
A. Basu ◽  
P. Singh ◽  
S. Chakrabarti
Keyword(s):  
Quantum Dots ◽  
Ion Implantation ◽  
Blue Shift ◽  
Low Energy ◽  
Stress Generation ◽  
Carbon Ions ◽  
Implantation Energy ◽  
Carbon Ion ◽  
Capping Layer ◽  
Pl Intensity

ABSTRACTUnder controlled irradiation of low energy carbon ions, photoluminescence (PL) study of InAs quantum dots prepared with different capping structures (GaAs and InAlGaAs) was carried out. Samples were investigated by varying implantation energy from 15 keV to 50 keV with fluence ranging between 3 × 1011ions/cm2 and 8 × 1011 ions/cm2. For fixed fluence of 4 × 1011ions/cm2, low temperature PL showed enhancement in a certain range of energy, along with a blue shift in the PL peak wavelength. In contrast, with varying fluence at fixed implantation energy of 50 keV, PL enhancement was not significant, rather a drop in PL intensity was noted at higher fluence from 5 × 1011 to 8 × 1011 ions/cm2. Moreover, carbon ion implantation caused a blue shift in the PL emission peak for both energy and fluence variations. PL intensity suppression was possibly caused by the formation of non-radiative recombination centers (NRCs) near the capping layer, while the corresponding blue shift might be attributed to stress generation in the capping layer due to implantation. As-grown and implanted InAlGaAs capped samples did not exhibit much variation in full width at half maxima of PL spectra; however, significant variation was observed for the GaAs capped sample. These results validate that InAlGaAs-capped QDs are more immune to ion implantation.

Investigation on the Modification Methods to Ceramic Cutting Tools

2007 ◽  
Vol 280-283 ◽  
pp. 1197-1202 ◽  
Author(s):  
He Zhuo Miao ◽  
Zhi Jian Peng ◽  
Wen Jie Si ◽  
Long Hao Qi ◽  
Jiang Hong Gong ◽  
...  
Keyword(s):  
Surface Modification ◽  
Ion Implantation ◽  
Young’S Modulus ◽  
Bending Strength ◽  
Flank Wear ◽  
Young's Modulus ◽  
Cutting Tools ◽  
High Energy ◽  
High Energy Density ◽  
Dispersion Strengthening

There are too many methods to enhance the performance of ceramic cutting tools. All the methods can be sorted into two types: inner modification and surface modification. One of the main method to the inner modification of ceramic cutting tools is dispersion strengthening. Usually, in order to enhance the performance of ceramic cutting tools, some dispersed phases of TiN, TiC or TiCN, Al2O3, and/or ZrO2, and so on, and/or some whiskers, or fibers were added into the ceramic matrixes. And the new types of cutting tools, which possessed much more excellent performance than the original ones, were called composite ceramic cutting tools. For the composite Si3N4-based ceramic, Al2O3-based ceramic, and TiCN-based cermet, the cutting efficiency could be enhanced to 3~10 times, compared with cemented carbide tools. And they can be used for rough and finish machining of various cast iron workpieces and hardened steels, respectively, including milling and planning. Ion implantation is a surface modification for ceramic cutting tools. With certain doses of metals, for example, titanium, zirconium and chromium, and so on, implanted into the ceramics, the hardness, Young’s modulus, fractural toughness, and bending strength, etc., can be enhanced. For Al2O3 and Si3N4 ceramics, the hardness, Young’s modulus, and bending strength increased with a maximum factor of 50%, and the flank wear decreased with a factor of 2~12, compared with the unimplanted ceramic cutting tools. However, the main shortcoming of ion implantation to modify ceramics is the thickness of modified layers. They are, usually, too thin for cutting tools. The so-called PHEDP, pulsed high energy density plasma, is another surface modification method for ceramic cutting tools proposed recently. With such method, much thicker coatings of TiN, TiCN and (Ti,Al)N, etc, were deposited onto Si3N4 and WC ceramic cutting tools.The main merits involved in high hardness and Young’s modulus of the coatings, low residual stresses, and good adhesive strength between the coatings and substrates. And the flank wear of the as-depositedtools decreased with a factor of 5~10.

scholarly journals Environment-Friendly Preparation of Reaction-Bonded Silicon Carbide by Addition of Boron in the Silicon Melt

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1090
Author(s):  
Maoqiang Rui ◽  
Yaxiang Zhang ◽  
Jing Ye
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Argon Atmosphere ◽  
Environment Friendly ◽  
Silicon Melt ◽  
Different Temperatures ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Reaction-bonded silicon carbide ceramics were sintered by infiltration of Si and B–Si alloy under an argon atmosphere at different temperatures. The element boron was added to the silicon melt to form a B–Si alloy first. The mechanical properties of samples were improved by infiltration of the B–Si melt. The samples infiltrated with the Si-only melt were found to be very sensitive to experimental temperature. The bending strengths of 58.6 and 317.0 MPa were achieved at 1530 and 1570 °C, respectively. The sample made by infiltration of B–Si alloy was successfully sintered at 1530 °C. The relative density of the sample was more than 90%. The infiltration of B–Si alloy reduced the sintering temperature and the bending strength reached 326.9 MPa. The infiltration mechanism of B–Si alloy is discussed herein.

ULTRA-DISPERSED ADDITIVES IN THE NICKEL COLLOID-ELECTROLYTE BATHS

2020 ◽  
Author(s):  
L.A. Degtyar ◽  
◽  
I.N. Tyaglivaya ◽  
K.V. Ovchinnikova ◽  
A.A. Kuts ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Wear Resistance ◽  
Zirconium Diboride ◽  
Internal Stresses ◽  
Agricultural Machinery ◽  
Nickel Coatings ◽  
Ultrafine Diamond ◽  
Optimal Values

The article presents the results of investigates of the effect of ultrafine additives - zirconium diboride, silicon carbide, diamond on the physic-mechanical properties of composite electrochemical nickel coatings obtained from colloid-electrolyte baths. It is shown that precipitation containing ultrafine diamond possess optimal values of microhardness, wear resistance and internal stresses. These coatings can be used as an alternative to chrome coatings on parts of agricultural machinery.

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