Influence of nitrogen Gas pressure on the miscibility Gap in the Ti–Zr carbonitride system

2012 ◽  
Vol 32 ◽  
pp. 11-15 ◽  
Author(s):  
Ida Borgh ◽  
Susanne Norgren ◽  
Annika Borgenstam ◽  
John Ågren
Keyword(s):  
Gas Pressure ◽  
Miscibility Gap ◽  
Nitrogen Gas

scholarly journals Effect of nitrogen gas pressure and ionization current on deposition of aluminum nitride film by reactive ion plating.

1987 ◽  
Vol 38 (6) ◽  
pp. 228-233
Author(s):  
Saburou KUWANO ◽  
Masahiro SUGIYAMA ◽  
Yoshio SHIBUYA ◽  
Terunori OOTAKE ◽  
Takeo OKI
Keyword(s):  
Aluminum Nitride ◽  
Gas Pressure ◽  
Nitride Film ◽  
Nitrogen Gas ◽  
Ion Plating ◽  
Ionization Current

Wear resistance of arc ion-plated chromium nitride coatings

1993 ◽  
Vol 8 (5) ◽  
pp. 1109-1115 ◽  
Author(s):  
Yuji Chiba ◽  
Toshio Omura ◽  
Hiroshi Ichimura
Keyword(s):  
Phase Diagram ◽  
Wear Resistance ◽  
Surface Morphology ◽  
Bias Voltage ◽  
Gas Pressure ◽  
Chromium Nitride ◽  
Nitrogen Gas ◽  
High Toughness ◽  
Nitride Coatings ◽  
Two Parameters

Wear resistance of arc ion-plated chromium nitride films has been studied. It has been found that texture and phases composing the films depend much on bias voltage and nitrogen gas pressure at the deposition. A phase diagram was constructed as a function of these two parameters, which indicated that three categories exist: CrN single, CrN and Cr2N dual, and CrN and Cr dual phased regions, respectively. Results of Falex No. 2 test showed that the wear resistance of CrN single phased films is superior to others, especially when (220) preferred orientation is developed. Since hardness and surface morphology do not differ much between these films, a high toughness of CrN single phased film is considered to make a difference by suppressing abrasion wear.

Silicon Nitride – Carbon Nanotube Composites

2007 ◽  
Vol 554 ◽  
pp. 123-128 ◽  
Author(s):  
Csaba Balázsi ◽  
Zsolt Czigány ◽  
Ferenc Wéber ◽  
Zoltán Kónya ◽  
Zófia Vértesy ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Silicon Nitride ◽  
Hot Isostatic Pressing ◽  
High Pressure Processing ◽  
Gas Pressure ◽  
Multiwall Carbon Nanotube ◽  
Nitrogen Gas ◽  
Transmission Electron ◽  
Nanotube Composites

Multiwall carbon nanotube reinforced silicon nitride composites have been prepared by hot isostatic pressing. A manufacturing process has been worked out to avoid the damage of nanotubes during sintering. This method provides their preservation even in severe circumstances at temperature 1700°C and gas pressure 20 MPa. As shown by scanning and transmission electron microscopy after low and high pressure processing, carbon nanotubes have good adherence to the silicon nitride grains. Moreover, carbon nanotubes have been found to be located not only at grain surfaces, but in several cases they are well integrated with the silicon nitride grains. Composites with higher strengths can be obtained by increasing the nitrogen gas pressure.

Substitutional disorder in Sr2−y Eu y B2−2x Si2+3x Al2−x N8+x (x ≃ 0.12, y ≃ 0.10)

2014 ◽  
Vol 70 (5) ◽  
pp. 452-454 ◽  
Author(s):  
Shiro Funahashi ◽  
Yuichi Michiue ◽  
Takashi Takeda ◽  
Rong-Jun Xie ◽  
Naoto Hirosaki
Keyword(s):  
Gas Pressure ◽  
Nitrogen Gas ◽  
Space Group

A novel nitride, Sr2−y Eu y B2−2x Si2+3x Al2−x N8+x (x ≃ 0.12, y ≃ 0.10) (distrontium europium diboron disilicon dialuminium octanitride), with the space group P\overline{6}2c, was synthesized from Sr3N2, EuN, Si3N4, AlN and BN under nitrogen gas pressure. The structure consists of a host framework with Sr/Eu atoms accommodated in the cavities. The host framework is constructed by the linkage of MN4 tetrahedra (M = Si, Al) and BN3 triangles, and contains substitutional disorder described by the alternative occupation of B2 or Si2N on the (0, 0, z) axis. The B2:Si2N ratio contained in an entire crystal is about 9:1.

Pressure Dependence of Phases in Carbon Nanosized Powders for Investigating Cooling Rate of Pulsed Wire Discharge Plasma

2006 ◽  
Vol 11-12 ◽  
pp. 307-310 ◽  
Author(s):  
Ryota Kobayashi ◽  
Seigo Nishimura ◽  
Tsuneo Suzuki ◽  
Tadachika Nakayama ◽  
Hisayuki Suematsu ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Carbon Fibers ◽  
Volume Fraction ◽  
Gas Pressure ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
Nitrogen Gas ◽  
Nanosized Powders ◽  
Pulsed Wire Discharge ◽  
Carbon Plasma

We have attempted phase identification of carbon nanosized powders prepared by pulsed wire discharge (PWD) to clarify the cooling process of PWD plasma. To prepare the carbon nanosized powders, carbon fibers were discharged in nitrogen gas at 26 – 101 kPa by PWD. Volume fractions of phases in the carbon nanosized powders were analyzed by thermogravimetric analysis and powder X-ray diffraction. The volume fraction of amorphous carbon, which must be formed by quenching of carbon plasma, was increased with increasing nitrogen gas pressure. This result suggested that the cooling rate of PWD plasma increased with increasing ambient gas pressure.

Microstructural and Mechanical Properties Changes of Silicon Nitride Based Ceramic Using Post-Sintering Heat Treatment

2012 ◽  
Vol 727-728 ◽  
pp. 1085-1091
Author(s):  
José Vitor C. Souza ◽  
O.M.M. Silva ◽  
E.A. Raymundo ◽  
João Paulo Barros Machado
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fracture Toughness ◽  
Grain Size ◽  
Wear Resistance ◽  
High Hardness ◽  
Gas Pressure ◽  
Low Density ◽  
Nitrogen Gas ◽  
Structural Applications

Si3N4based ceramics are widely researched because of their low density, high hardness, toughness and wear resistance. Post-sintering heat treatments can enhance their properties. Thus, the objective of the present paper was the development of a Si3N4based ceramic, suitable for structural applications, by sintering in nitrogen gas pressure, using AlN, Al2O3, and Y2O3as additives and post-sintering heat treatment. The green bodies were fabricated by uniaxial pressing at 80 MPa with subsequent isostatic pressing at 300 MPa. The samples were sintered at 1900°C for 1 h under N2gas pressure of 0.1 MPa. Post-sintering heat treatment was performed at 1500°C for 48 h under N2gas pressure of 1.0 MPa. From the results, it was observed that after post-sintering heat treatment there was a reduction of α-SiAlON phase and increase of β-Si3N4phase, with consequent changing in grain size, decrease of fracture toughness and increase of the Vickers hardness.

scholarly journals Sintering of Hydroxyapatite/Yttria Stabilized Zirconia Nanocomposites under Nitrogen Gas for Dental Materials

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
C. H. Leong ◽  
A. Muchtar ◽  
C. Y. Tan ◽  
M. Razali ◽  
Noor Faeizah Amat
Keyword(s):  
Relative Density ◽  
Phase Stability ◽  
Dental Materials ◽  
Gas Pressure ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Nitrogen Gas ◽  
Conventional Sintering ◽  
Gas Pressure Sintering ◽  
The Relationship

This study aims to determine the effect of adding 3 mol% yttria stabilized zirconia (3YSZ) in hydroxyapatite (HA) and sintering HA/3YSZ nanocomposites under nitrogen gas on HA decomposition. This paper presents the relationship between microstructure and mechanical properties of HA/3YSZ nanocomposites. Gas pressure and conventional sintering were performed on HA/3YSZ nanocomposites containing different amounts of 3YSZ (i.e., 0, 0.5, 1, and 7 wt%) at 1250°C. The phase stability, morphology, relative density, and microhardness of the HA/3YSZ nanocomposites were investigated. The phase stability of the HA/3YSZ nanocomposites was affected by adding different amounts of 3YSZ. Overall, gas pressure sintering leads to the formation of greater grain size compared with the conventional sintering method. The severe HA decomposition and the presence of the porosity in HA/7 wt% 3YSZ have led to deterioration in relative density and microhardness. In this study, HA/0.5 wt% 3YSZ with gas pressure sintering exhibited the optimum microstructure with the highest relative density (97%) and microhardness (3.93 GPa).

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