scholarly journals THE DIAGRAM OF THE DYNAMIC CHANNELANGULAR PRESSING OF TITANIUM SPECIMEN

2017 ◽  
Vol 1 (№11 2017) ◽  
pp. 28-31
Author(s):  
S.A. Zelepugin ◽  
A.S. Bodrov ◽  
N.V. Pakhnutova
Keyword(s):  
Titanium Specimen

scholarly journals Poly(methyl methacrylate) Coating of Titanium Workpieces to Reduce Burrs in Micro-drilling

Micromachines ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 838
Author(s):  
Luca Giorleo
Keyword(s):  
Methyl Methacrylate ◽  
Three Dimensional ◽  
Titanium Sheet ◽  
Burr Height ◽  
Poly Methyl Methacrylate ◽  
Drill Bits ◽  
Micro Drilling ◽  
Quantitative Analyses ◽  
Uncoated Titanium ◽  
Titanium Specimen

A technique to reduce burr height in titanium micro-drilling is presented: a poly (methyl methacrylate) coating was applied before machining on the upper and lower surfaces of a titanium specimen (0.5-mm thick). After drilling, a cleaning process (acetone bath) was executed to eliminate the coating, and holes with less burr were obtained. The coating process was executed with a spin-coating machine. To test the efficacy of the technique, two different coating thicknesses (7.9 and 5.4 μm) and two drill bits (0.25- and 0.5-mm diameter) were evaluated. Qualitative and quantitative analyses of the holes obtained were performed with scanning electron microscopy and three-dimensional microscopy, respectively. The results highlight the efficacy of the technique to reduce the burr height by 70% in coated titanium relative to that in an uncoated titanium sheet.

Experimental Study on Dynamic Behavior of a Titanium Specimen Using the Thermal-Acoustic Fatigue Apparatus

2020 ◽  
Vol 48 (2) ◽  
pp. 127-134
Author(s):  
Eun-Su Go ◽  
Mun-Guk Kim ◽  
Young-Sun Moon ◽  
In-Gul Kim ◽  
Jae-Sang Park ◽  
...  
Keyword(s):  
Experimental Study ◽  
Dynamic Behavior ◽  
Acoustic Fatigue ◽  
Titanium Specimen

Deformation Twinning During Impact of a Titanium Cylinder: Numerical Investigation

2000 ◽  
Author(s):  
I. Lapczyk ◽  
K. R. Rajagopal ◽  
A. R. Srinivasa
Keyword(s):  
Grain Size ◽  
Major Effect ◽  
Deformation Twinning ◽  
Galerkin Finite Element Method ◽  
Galerkin Finite Element ◽  
Grain Sizes ◽  
Polycrystalline Metals ◽  
Taylor Impact ◽  
Inelastic Processes ◽  
Titanium Specimen

Abstract It is well known that polycrystalline metals (especially those with bcc or hcp structures), when subjected to impact, undergo two inelastic processes — slip and twinning. Since the work of Taylor (1948) the former one has been studied extensively; while more recently, deformation twinning has attracted attention of some researchers, e.g. Bolling & Richman (1965), Armstrong & Worthington (1974) and Zerilli & Armstrong (1988). Zerilli and Armstrong (1988) suggested that the major effect of twinning is a refinement of the grain size. Based on this assumption, they proposed a model for twinning and showed that much better agreement with experiments can be obtained if, in addition to deformation by slip, deformation twinning is also considered. Similar conclusions were reached by Holt, Mock, Zerilli and Clark (1994) who analyzed the Taylor impact of a titanium specimen. In this study, we model the Taylor impact of a titanium cylinder. We assume that the problem is axisymmetric and solve the full dynamic equations by using the Galerkin finite element method. Our results show that the energy absorbed during twinning and the deformation due to twinning are relatively small. We also demonstrate the dependence of the results on the initial grain size of the material. Specifically, by modeling two materials of widely differing grain sizes, we show that the long-grained material twins substantially more than the small-grained material.

Critical conditions of the combustion of compressed titanium specimen

1998 ◽  
Vol 34 (3) ◽  
pp. 292-297 ◽  
Author(s):  
N. N. Bakhman ◽  
G. P. Kuznetsov ◽  
V. M. Puchkov
Keyword(s):  
Critical Conditions ◽  
Titanium Specimen

scholarly journals Thin TiO2 Nanocoating of Porous Titanium through Radio Frequency Magnetron Sputtering to Improve the Biological Response of Orthopedic Implants

2021 ◽  
Vol In Press (In Press) ◽  
Author(s):  
Roghayeh Haghjoo ◽  
Seyed Khatiboleslam Sadrnezhaad ◽  
Nahid Hasanzadeh Nemati
Keyword(s):  
Magnetron Sputtering ◽  
Biological Response ◽  
Orthopedic Implants ◽  
Porous Titanium ◽  
X Ray Diffraction ◽  
X Ray ◽  
Titanium Foam ◽  
Surface Morphologies ◽  
Titanium Specimen

: The present study applied a TiO2 nanocoating on a titanium foam substrate produced by powder metallurgy through magnetron sputtering. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were employed to investigate the surface morphologies of the porous specimens and pre- and post-coating phases, respectively. Also, the growth and proliferation of MG-63 cells (osteoblasts) and their attachment and proliferation on the coated porous titanium specimen (relative to the uncoated specimens) were studied using in vitro and methyl thiazol tetrazolium (MTT) cytotoxicity tests. Considering the porous macrostructure of the coated titanium specimen and the nanostructure of the TiO2 coating on the porous surface and macro-pore walls, the coated specimen was found to be effective in the biocompatibility improvement of dental and orthopedic implants.

Carbo-Nitride Coating Treatment of Titanium by a Diffusional Method

2007 ◽  
Vol 280-283 ◽  
pp. 1847-1850
Author(s):  
Kiyotaka Matsuura ◽  
Masayuki Kudoh
Keyword(s):  
Titanium Surface ◽  
Arrhenius Equation ◽  
Pure Titanium ◽  
Thin Layers ◽  
Pure Nitrogen ◽  
Titanium Layer ◽  
Parabolic Law ◽  
Wear And Corrosion ◽  
Heat Treated ◽  
Titanium Specimen

Titanium surface was covered with thin layers of titanium monocarbo-nitride, Ti(C,N) and nitrogen-rich a-titanium, after a titanium specimen was heat-treated at a temperature between 1388 and 1573 K in a graphite cup in an atmosphere of pure nitrogen. The total thickness of those layers increased in accordance with the parabolic law when both temperature and time of the heat treatment increased. The parabolic rate constants was described as k = 4.83 × 10-6 exp (-178000/RT)m2/s using Arrhenius’ equation. Vickers hardness of the Ti(C, N) layer remained at approximately 2000 but that of the a-titanium layer gradually decreased from 1500 to 500, as the distance from the surface increased. The carbo-nitridetreated titanium exhibited excellent resistances in wear and corrosion compared with those of pure titanium.

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