scholarly journals THE EFFECT OF COLD ISOSTATIC PRESSING ON THE SINTERABILITY OF SYNTHESIZED HA

2004 ◽  
Vol 16 (04) ◽  
pp. 199-204 ◽  
Author(s):  
S. RAMESH ◽  
P. CHRISTOPHER ◽  
C. Y. TAN ◽  
W. D. TENG
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Bulk Density ◽  
Phase Stability ◽  
Vickers Hardness ◽  
Linear Shrinkage ◽  
Cold Isostatic Pressing ◽  
Low Temperature Sintering ◽  
Cold Isostatic Press ◽  
Isostatic Pressing

The effect of cold isostatic pressing (CIP) on the sinterability of a laboratory synthesized hydroxyapatite (HA) powder was investigated. The starting powder was initially uniaxially diepressed at about 6 kN force to form disk and rectangular green compacts. Two batches of green samples were prepared, i.e. one batch was in the as-compacted state (Un-CIP) and another batch samples was subjected to cold isostatic press at 200 MPa (CIP). The latter samples exhibited alinear shrinkage of ∼16% prior to sintering. All the samples were sintered in air at temperatures ranging from 700°C to 1400°C. The densification behaviour of HA was evaluated in terms of linear shrinkage, phase stability, bulk density, Vickers hardness and Young's modulus. The results revealed that green samples subjected to cold isostatic pressing exhibited better sinterability and possessed excellent mechanical properties. This effect is more pronounced particularly for the low temperature sintering regime i.e. < 1100°C.

The Role of Nb2Zr6O17 Phase on the Hardness and Fracture Toughness of ZTA/Nb2O5 by Cold Isostatic Pressing

2017 ◽  
Vol 888 ◽  
pp. 126-130 ◽  
Author(s):  
Nurul Khairunnisa Su ◽  
Muhammad Fadhlullah Al Amin Abdul Razak ◽  
Johar Banjuraizah ◽  
Muhammad Asri Idris ◽  
Zainal Arifin Ahmad
Keyword(s):  
Fracture Toughness ◽  
Vickers Hardness ◽  
Secondary Phase ◽  
Cold Isostatic Pressing ◽  
Cip Method ◽  
X Ray ◽  
Isostatic Pressing ◽  
Zirconia Toughened Alumina ◽  
Scanning Electron

The microstructure and mechanical properties of zirconia toughened alumina (ZTA) ceramic added with niobia (Nb2O5) through cold isostatic pressing (CIP) method was investigated. The amount of Nb2O5 is varied from 0 wt.% to 7 wt.%. The phase composition of the sintered bodies was analyzed with an x-ray diffractometer, while their microstructure was observed with a scanning electron microscope. It is found that up to 3 wt.% of Nb2O5 addition, the secondary phase of Nb2Zr6O17 presence as square shape particles confirm by SEM and EDX. The addition of 3 wt.% showed the highest Vickers hardness value with 1600HV. It was observed that, further addition of Nb2O5 (> 3 wt.% ) deteriorates the Vickers hardness of ZTA. While the fracture toughness value increased at 3 wt.% until 5 wt.% of Nb2O5 addition (6.71 MPa · √m and 6.80 MPa · √m respectively). It was also found that the value for bulk density increased and porosity decreased with the increasing of Nb2O5 addition.

scholarly journals Effect of Input Parameter of Cold Isostatic Press (CIP) Towards Properties of Zirconia Block

2019 ◽  
Vol 9 (1) ◽  
pp. 5908-5912
Keyword(s):  
Mechanical Properties ◽  
Wide Spectrum ◽  
Input Parameter ◽  
Strength Properties ◽  
Cold Isostatic Pressing ◽  
X Ray Diffraction ◽  
Cold Isostatic Press ◽  
Forming Process ◽  
Soaking Time ◽  
Four Levels

Zirconia have become widely studied as consequence of their outstanding mechanical properties, such as hardness, mechanical strength and fracture toughness, which allow them to cover a wide spectrum of applications as structural ceramics, including the field of biomaterials. This study was to compare the strength properties of zirconia block with and without Cold Isostatic Press (CIP). The mechanical properties of zirconia block with and without CIP were characterized. Samples of zirconia block will undergo forming process via Cold Isostatic Pressing (CIP), four levels of soaking time (no CIP, 60, 90 and 120 minutes). All of the sample with different soaking time then were sinter in the furnace. The parameter for sintering process was fixed 1300ºC at rate of 3ºC / min. All of the sample were tested for its strength properties using Vickers test. The density and shrinkage of the zirconia block was be analyzed. Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) were used to characterize samples if zirconia blocks.

Performance of Nd-Fe-B Magnets Fabricated by Hot Isostatic Pressing and Low-Temperature Sintering

2018 ◽  
Vol 28 (1) ◽  
pp. 273-277 ◽  
Author(s):  
Fang Yang ◽  
Haiying Wang ◽  
Li You ◽  
Alex A. Volinsky ◽  
Ce Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hot Isostatic Pressing ◽  
Low Temperature Sintering ◽  
Isostatic Pressing

Effect of Cold Isostatic Pressing on the Mechanical Properties of WC-8Co Cemented Carbide for Friction Stir Welding Tool

2014 ◽  
Vol 563 ◽  
pp. 107-111
Author(s):  
Chen Zhang ◽  
Bing Liang Liang ◽  
Yun Long Ai ◽  
Chang Hong Liu
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Relative Density ◽  
Cold Isostatic Pressing ◽  
Cemented Carbide ◽  
Vacuum Sintering ◽  
Pressing Method ◽  
Isostatic Pressing ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties

WC-8Co cemented carbide specimens were prepared via vacuum sintering. The effects of cold isostatic pressing (CIP) on microstructure and mechanical properties were investigated. The results show that only WC and Co3W3C (γ-phase) were detected by XRD without any else phases, even though Co. Dense WC-8Co cemented carbide samples were obtained and relative density reached over 98%. The pressing method, instead of pressure, took an important role in the mechanical properties of WC-8Co cemented carbide. KIC and TRS of WC-8Co cemented carbide were improved at least 27% and 24%, respectively, by the use of CIP. WC-8Co cemented carbide with excellent mechanical properties (HRA>93.5, KIC>11MPa·m1/2, TRS>870MPa) was obtained by using CIP.

The Effect of Iron Oxide on the Mechanical and Ageing Properties of Y-TZP Ceramic

2016 ◽  
Vol 701 ◽  
pp. 225-229 ◽  
Author(s):  
Sivanesan Sivakumar ◽  
Hsien Loong Teow ◽  
Ramesh Singh ◽  
Ali Niakan ◽  
Nobuyuki Mase
Keyword(s):  
Fracture Toughness ◽  
Iron Oxide ◽  
Bulk Density ◽  
Phase Stability ◽  
Vickers Hardness ◽  
Tetragonal Phase ◽  
Superheated Steam ◽  
Matrix Stiffness ◽  
Sintering Aid ◽  
The Matrix

A small amount of iron oxide (Fe2O3) was added to the commercially available 3 mol% Y-TZP as a sintering aid over a temperature range of 1250°C to 1500°C. Sintered samples were then evaluated to determine the bulk density, Vickers hardness, and fracture toughness. In addition, hydrothermal ageing experiments to determine the tetragonal phase stability were performed on selected sintered samples in superheated steam at 180°C / 10 bar for up to 24 hours. Based on the work carried out, it was revealed that additions of Fe2O3 particularly 0.3 wt% was indeed beneficial in aiding densification, improving the matrix stiffness and hardness when compared to undoped Y-TZP sintered at temperatures below 1350°C. Addition of Fe2O3 was found to have negligible effects on the fracture toughness of all samples with the exception of the 0.5 and 1 wt% doped Y-YZP sintered above 1400°C. Hydrothermal ageing resistance of Y-TZP was found to be enhanced with the addition of Fe2O3 in the Y-TZP matrix.

Mechanical properties and low-temperature aging of tetragonal zirconia polycrystals processed by hot isostatic pressing

2003 ◽  
Vol 18 (10) ◽  
pp. 2415-2426 ◽  
Author(s):  
J. Muñoz-Saldaña ◽  
H. Balmori-Ramírez ◽  
D. Jaramillo-Vigueras ◽  
T. Iga ◽  
G. A. Schneider
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Low Temperature ◽  
Hot Isostatic Pressing ◽  
Tetragonal Zirconia ◽  
Hot Water ◽  
Full Density ◽  
Isostatic Pressing ◽  
Low Temperature Aging ◽  
Temperature Aging

The influence of grain size and density of yttria-tetragonal zirconia polycrystals (Y-TZPs) ceramics on mechanical properties and on low-temperature aging degradation (LTD) in air and in hot water was investigated. A TZP powder containing 3 mol% Y2O3 was consolidated by slip casting and densified by the sintering/hot isostatic pressing (HIP) method. Only the presintered samples that contained less than 0.15% open porosity reached near full density after HIP. The best conditions to reach full density were found to be attained by presintering and HIP both at 1400 °C. At these conditions, some of the best mechanical properties such as modulus of rupture and Weibull modulus reached 1397 ± 153 MPa and, 10.6, respectively. These values were clearly higher than those obtained from sintered bodies and samples hot isostatically pressed at 1600 °C. Aging degradation of 3Y-TZP materials can be avoided through microstructural design. Fully dense materials with a critical grain size <0.36 μm did not show any evidence of degradation after extreme aging conditions at pressurized autoclaving in hot water at 100, 200, and 260 °C for 8 h. We propose a criterion to predict degradation in air as well as in hot water for the characterized materials based on the microstructure and density control of the samples.

Simultaneous Synthesis and Sintering of Al2O3/Mo2N Composites Using Capsule-Free Nitrogen Hot Isostatic Pressing and their Characterization

2010 ◽  
Vol 62 ◽  
pp. 197-202
Author(s):  
Hirota Ken ◽  
Takaoka Katsuya ◽  
Murase Yasushi ◽  
Kato Masaki
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Size ◽  
Vickers Hardness ◽  
Bending Strength ◽  
Hot Isostatic Pressing ◽  
Isostatic Pressing ◽  
Simultaneous Synthesis ◽  
Powder Compacts ◽  
Al2o3 Matrix

Synthesis of dense materials with the compositions of Al2O3/Mo2N=100/0 ~ 40/60 vol% has been attempted directly from Al2O3/Mo mixed raw powder compacts using capsule-free N2 hot isostatic pressing (HIP). During HIPing [1500°C/(16~20)MPa]/1h], solid/gas reaction between Mo and N2 was introduced to form Mo2N. Most sintered composites consisting of only Al2O3 and Mo2N phases reached a higher relative density than 98.0% with closed pores nevertheless capsule-free HIPing. Distribution of Mo2N particles just formed suppressed the grain growth of Al2O3 during sintering. Mechanical properties, such as bending strength (Σb), Vickers hardness (HV), fracture toughness (K1C), and other properties have been evaluated as a function of their compositions. The best mechanical values of Σb (c.a. 573 MPa), HV (c.a. 20.3 GPa) and K1C (c.a. 5.00 MPa･m1/2) were attained at the composition of Al2O3/Mo2N=90/10 vol%, due to a high density (98.6%) and small grain size of Al2O3 matrix (Gs c.a. 4.70 μm). Further addition of Mo2N reduced the sinterability of matrix grains, resulting in low densities of around 90% at the 40/60 vol% composition.

Influence of Sintering Temperature on the Translucency of Sintered Zirconia by Cold Isostatic Pressing

2014 ◽  
Vol 896 ◽  
pp. 591-595
Author(s):  
Chuin Hao Chin ◽  
Andanastuti Muchtar ◽  
Noor Faeizah Amat ◽  
Mariyam Jameelah Ghazali ◽  
Norziha Yahaya
Keyword(s):  
Mechanical Properties ◽  
Sintering Temperature ◽  
Tetragonal Zirconia ◽  
Hardness Test ◽  
Cold Isostatic Pressing ◽  
Light Transmittance ◽  
Isostatic Pressing ◽  
Different Temperatures ◽  
Pellet Form ◽  
Dental Applications

Zirconia-based ceramics exhibit excellent mechanical properties and biocompatibility in dental applications. However, the production of translucent zirconia that offers resemblance to real teeth remains a challenge. This study aims to fabricate zirconia compacts by cold isostatic pressing (CIP) and investigate the influence of sintering temperature on translucency, microstructure, hardness, and density of yttria-stabilized tetragonal zirconia polycrystals (Y-TZP). Zirconia stabilized with 3 mol% yttria (3Y-TZP) was pressed by uniaxial pressing and later by CIP to produce green bodies in pellet form. Subsequently, the green bodies were sintered at different temperatures (1100 °C to 1300 °C). The specimens were then investigated in terms of translucency, density, and hardness. X-ray diffraction was also performed and the microstructure of the specimens was observed under a scanning electron microscope (SEM). Density and light transmittance tests results showed that zirconia sintered at 1200 °C exhibits the highest density (5.957 g/cm3) and light transmittance intensity. Vickers hardness test showed that higher sintering temperatures result in higher hardness of the sintered zirconia. SEM micrographs illustrate the effect of microstructural changes on the translucency of zirconia. A temperature of 1200 °C is found to be the recommended sintering temperature at which zirconia exhibiting optimum translucency and mechanical properties is produced. CIP is found to be a suitable consolidation method to produce high-density translucent zirconia.

Mechanical properties of hydroxylapatite specimens obtained by cold isostatic pressing

Refractories ◽  
1994 ◽  
Vol 35 (5) ◽  
pp. 159-161
Author(s):  
G. Ya. Akimov ◽  
V. M. Timchenko ◽  
P. A. Arsen'ev
Keyword(s):  
Mechanical Properties ◽  
Cold Isostatic Pressing ◽  
Isostatic Pressing
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