Effect of Titanium Implantation on the Mechanical Properties of Silicon Nitride

1994 ◽  
Vol 354 ◽  
Author(s):  
T. Fujihana ◽  
O. Nishimura ◽  
K. Yabe ◽  
H. Hayashi ◽  
M. Iwaki
Keyword(s):  
Mechanical Properties ◽  
Friction Coefficient ◽  
Room Temperature ◽  
Surface Hardness ◽  
Atomic Fraction ◽  
Metallic State ◽  
Wear Properties ◽  
Surface Layers ◽  
Near Surface ◽  
Projected Range

AbstractA study has been made of the chemical composition and mechanical properties of Ti+-implanted Si3N4 surface layers. Implantation of 48Ti+ was performed with doses ranging from 10 to 1017 ions cm”2 at an energy of 150 keV, and at nearly room temperature. XPS was used to analyze the depth dependence of atomic fraction and chemical bonding states of Ti+-implanted layers. The near-surface hardness was measured by a Vickers hardness tester. The friction and wear properties were measured under unlubricated conditions at room temperature using a pin on disk-plane and a block on wheel-periphery configurations, in which the pin and wheel used were AISI1045 and ASTM Wl-9, respectively. Implanted Ti-atoms formed a gaussian distribution predicted by the range theory. At the average projected range, most of Ti-atoms existed as a metallic state and TiN bonding was also formed. Oxygen and carbon were found near the surface layers. In addition to the surface peak, O-atoms accumulated in front of the average projected range of Ti. Such O-atoms formed bonds of Si-oxides and Ti-oxides. Carbon existed as a graphitic state. With increasing a Ti dose, the near-surface hardness decreased, and the wear rate increased at the running-in stage having the high friction coefficient. The steady wear attributed to the stable friction coefficient appeared after the running-in stage, although such a stable stage was not observed for unimplanted Si3N4. The mechanism for the change in mechanical properties of Si3N4 induced by Ti+-implantation will be discussed in relation to XPS characteristics.

Surface mechanical properties of C implanted Ni

1988 ◽  
Vol 3 (2) ◽  
pp. 226-232 ◽  
Author(s):  
M. Nastasi ◽  
J. -P. Hirvonen ◽  
T. R. Jervis ◽  
G. M. Pharr ◽  
W. C. Oliver
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Friction Coefficient ◽  
Coefficient Of Friction ◽  
Metastable Phase ◽  
Surface Hardness ◽  
Amorphous Structure ◽  
Surface Microstructure ◽  
Wear Properties ◽  
The Coefficient Of Friction

Nickel foils, 165 μm thick, have been carbon implanted at 300 K with 2, 3, and 4.2 × 1017 C ions/cm2 and implanted with a two-step implantation of 2.1 × 1017 C/cm2 at 300 K followed by 2.1 × 1017 C/cm2 at 77 K. All implantations performed at 300 K result in the formation of the metastablc phase Ni3C while the two-step implantation produces an amorphous Ni/C alloy. Surface mechanical property studies showed that both the surface hardness and wear properties are correlated with chemistry (carbon dose), and that the friction coefficient is additionally dependent on the surface microstructure. It was found that both the wear rate and coefficient of friction were reduced as the volume fracion of Ni3C increased. At the highest dose implanted 4.2 × 1017 C/cm7, the coefficient of friction was found to be lower for the sample implanted half at 300 K and half at 77 K and possessing an amorphous structure compared to the sample implanted entirely at 300 K and possessing a crystalline Ni3C structure. Increases in the surface hardness were also observed with increasing carbon content, with the greatest hardness observed in samples implanted to a total dose of 4.2 × 1017 C/cm2. The hardness at this dose was not dependent on the implant conditions or the metastable phase formed.

Influence of ion treatment modes on the physical and mechanical properties of zirconia ceramics

2020 ◽  
Vol 10 ◽  
pp. 5-18
Author(s):  
S. А. Ghyngаzоv ◽  
◽  
V. А. Коstеnко ◽  
A. K. Khassenov ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Current Density ◽  
Ion Beam ◽  
Physical And Mechanical Properties ◽  
Oxygen Stoichiometry ◽  
Continuous Mode ◽  
Zirconia Ceramics ◽  
Surface Layers ◽  
Near Surface ◽  
Ion Treatment

The article considers the influence of the treatment modes by N2+ and Ar+ ions beams on the physical and mechanical properties of zirconia ceramics. Surface modification of zirconia ceramics was performed using two modes of ion treatment — pulsed and continuous. The pulse mode of treatment by N2+ ions was realized at an accelerating voltage of 250 – 300 kV, current density j = 150 – 200 A/cm2, and energy density W = (3.5 and 5) ± 5 % J/cm2. The continuous mode of treatment by Ar+ ions was realized at an accelerating voltage of 30 kV and an ion current density of 300 and 500 μA/cm2. The fluence of the Ar+ ion beam varied from 1016 to 1018 cm–2. It is established that the pulsed mode of ion treatment leads to the melting and recrystallization of the surface of ceramics. It is shown that this treatment leads to a violation of the oxygen stoichiometry in ceramics and, as a result, there is an appearance of electrical conductivity in the near-surface layers, the layers of zirconia ceramics become conductive. It was established that the continuous mode of ion treatment does not lead to the melting and recrystallization of the ceramics surface, but is accompanied by its slight etching. It is shown that under the action of continuous ion treatment, microhardness increases (by 14 %). Hardening of the surface layers of ceramics is observed at a depth that exceeds the average projected range of Ar+ ion by 103 times.

Physico-mechanical properties and micromechanisms of local deformation in thin near-surface layers of complex multiphase materials

2017 ◽  
Vol 81 (3) ◽  
pp. 360-364 ◽  
Author(s):  
Y. I. Golovin ◽  
A. I. Tyurin ◽  
S. D. Victorov ◽  
A. N. Kochanov ◽  
A. A. Samodurov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Local Deformation ◽  
Surface Layers ◽  
Near Surface ◽  
Multiphase Materials

Evaluating Micromechanical Properties at Surfaces Using Nanoindentation With Finite-Element Modeling

2002 ◽  
Author(s):  
J. A. Knapp ◽  
D. M. Follstaedt ◽  
S. M. Myers
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Mechanical Damage ◽  
Surface Region ◽  
Small Scale ◽  
Surface Layers ◽  
Near Surface ◽  
Element Modeling ◽  
Surface Modified

Detailed finite-element modeling of nanoindentation data is used to obtain accurate mechanical properties of very thin films or surface-modified layers independently of the properties of the underlying substrates. These procedures accurately deduce the yield strength, elastic modulus, and layer hardness, and greatly increase the usefulness of indentation testing with very thin surface layers. Moreover, extraction of the effective Young’s modulus in the near surface region should enable mechanical damage studies on a small scale. This paper presents a brief overview of the procedures involved and illustrates them with He-implanted Ni.

Lappability of end gauges and mechanical properties of their near-surface layers

1986 ◽  
Vol 29 (7) ◽  
pp. 621-624
Author(s):  
G. B. Kainer ◽  
V. M. Kuchumova ◽  
L. A. Kochanova ◽  
V. I. Savenko ◽  
N. P. Fedoseeva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Layers ◽  
Near Surface ◽  
End Gauges

scholarly journals Effect of Precuring Warming on Mechanical Properties of Restorative Composites

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Kareem Nada ◽  
Omar El-Mowafy
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Room Temperature ◽  
Surface Hardness ◽  
Mean Value ◽  
Test Surface ◽  
Bulk Properties ◽  
Mean Values ◽  
Enhanced Surface ◽  
Diametral Tensile Strength

To investigate the effect of prepolymerization warming on composites' mechanical properties, three composites were evaluated: Clearfil Majesty (CM) (Kuraray), Z-100 (3M/ESPE), and Light-Core (LC) (Bisco). Specimens were prepared from each composite at room temperature as control and 2 higher temperatures (37∘Cand54∘C) to test surface hardness (SH), compressive strength (CS), and diametral tensile strength (DTS). Data were statistically analyzed using ANOVA and Fisher's LSD tests. Results revealed that prewarming CM and Z100 specimens significantly improved their SH mean values (P<0.05). Prewarming also improved mean CS values of Z100 specimens (P<0.05). Furthermore, DTS mean value of CM prepared at52∘was significantly higher than that of room temperature specimens (P<0.05). KHN, CS, and DTS mean values varied significantly among the three composites. In conclusion, Prewarming significantly enhanced surface hardness of 2 composites. Prewarming also improved bulk properties of the composites; however, this improvement was significant in only some of the tested materials.

Mechanical Properties and Wear Behavior of Polypropylene/Carbon Nanotube Nanocomposites

2011 ◽  
Vol 299-300 ◽  
pp. 798-801 ◽  
Author(s):  
Yan Hui Liu ◽  
Jing Long Gao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Carbon Nanotube ◽  
Friction Coefficient ◽  
Wear Behavior ◽  
Ultimate Strain ◽  
Wear Properties ◽  
Compact Strength

Polypropylene(PP)/carbon nanotube(CNTs) nanocomposites with different CNTs fraction were prepared by the melting blend method. The effects of CNTs content on the wear properties and mechanical properties were mainly investigated. The results show that the friction coefficient of the nanocomposites decreased as the concentration of CNTs is increased. With increasing CNTs content, tensile strength, ultimate strain, compact strength and Young’s modules increase firstly and then decrease. For the composite with an effective CNTs content of 3 wt, its tensile strength, ultimate strain, compact strength and Young's modules were improved by 72, 44.4,88 and 37 %, respectively, as compared to PP.

Effects of Preferred Orientation on the Tribological Behavior of the TiN and CrN Films by the CAIP

2005 ◽  
Vol 890 ◽  
Author(s):  
Sang Geun Bae ◽  
Yong Ki Cho ◽  
Kyoung Il Moon ◽  
Sang Gweon Kim ◽  
Sung Wan Kim
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Tribological Property ◽  
Tribological Behavior ◽  
Surface Hardness ◽  
Preferred Orientation ◽  
Wear Properties ◽  
Tin Coating ◽  
Coating Films ◽  
Working Pressure

AbstractFor the better understanding of anti-wear properties of hard coating films, the effects of preferred orientation, surface roughness, and surface hardness on the tribological property of TiN and CrN films have been studied. TiN and CrN films were deposited by cathodic AIP (CAIP) with working temperatures of 350∼450°C, working pressures of 1∼5Pa, arc currents of 50∼90 A, and bias voltages of 30∼150V. The characteristics of microstructure and its effect on the friction coefficient were investigated with working conditions. The preferred orientation of the film was examined by XRD. The friction coefficient was determined using ball on disk tribometer. The preferred orientation of films was changed from (200) to (111) with decreasing working pressure and increasing bias voltage. It is reported that TiN coating with strong (111) orientation have better tribological property, but, in this study, although similar tendency was also found in TiN, the tribological property was increased with diminishing (111) orientation in CrN films. It is concluded in this study that the tribological property is not affected only by the orientation of the film, but it depends on the combined properties of surface roughness, surface hardness, and orientation of the film. The friction coefficients of TiN and CrN were 0.48∼0.52 and 0.49∼0.53, respectively.

Cryogenic Treatment of 06Cr19Ni10 Austenitic Stainless Steel

2013 ◽  
Vol 749 ◽  
pp. 187-191 ◽  
Author(s):  
Hong Zhang ◽  
Kai Xuan Gu ◽  
Jia Guo ◽  
Xiao Dai Xue ◽  
Jun Jie Wang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Austenitic Stainless Steel ◽  
Room Temperature ◽  
Treatment Process ◽  
Cryogenic Treatment

The effect of cryogenic treatment on mechanical properties and wear resistance at room temperature of 06Cr19Ni10 austenitic stainless steel was studied in the present study. The cryogenic treatment process was carried out at-160 and different time in program-controlled cryogenic container. The results showed that, after cryogenic treatment, the room-temperature mechanical properties of the 06Cr19Ni10 steel remained stable without embrittlement, friction coefficient of the 06Cr19Ni10 steel decreased and the wear resistance improved after cryogenic treatment. When cryogenic treatment was treated at-160 for two hours and thirty minutes, the friction coefficient of the 06Cr19Ni10 steel was the smallest and wear resistance was the best.

Room-Temperature Diffusion of Mn in CdTe and the Formation of Cd1-xMnxTe

1989 ◽  
Vol 163 ◽  
Author(s):  
A. Wall ◽  
A. Raisanen ◽  
G. Haugstad ◽  
A. Franciosi
Keyword(s):  
Room Temperature ◽  
Semiconductor Surface ◽  
Surface Layers ◽  
Near Surface ◽  
Bulk Crystal Growth ◽  
Temperature Diffusion ◽  
Cation Sites ◽  
Growth Methods ◽  
Mn Concentration ◽  
Synchrotron Radiation Photoemission

AbstractDeposition of Mn at room temperature onto atomically clean CdTe(110) surfaces yields atomic interdiffusion for metal coverages <3 angstroms with Mn atoms occupying cation sites within the surface and near-surface layers of the semiconductor. Synchrotron radiation photoemission studies with variable photoelectron escape depth indicate the formation of a relatively homogeneous semiconductor surface alloy. The highest Mn concentration observed in the alloy exceeds those obtainable with bulk crystal growth methods.

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