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

Low-Temperature Sintering of α- and β-SiC Powders with AlB2 Additive

2006 ◽  
Vol 317-318 ◽  
pp. 23-26 ◽  
Author(s):  
Hidehiko Tanaka ◽  
Toshiyuki Nishimura ◽  
Naoto Hirosaki ◽  
Y. Kishi ◽  
H. Matsuo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Grain Growth ◽  
Hot Isostatic Pressing ◽  
Theoretical Density ◽  
Low Temperature Sintering ◽  
Isostatic Pressing

We sintered α (6H)- and β(3C)-SiC powders using an Al-B-C additive. SiC powders were densified to > 98% of the theoretical density from 1950 to 2150oC with 0.67-2.7 mass % AlB2 and 2.0 mass % C. Sintering temperatures are 150-200 oC lower than the conventional. During sintering, 6H polytype in α-SiC powder was partly transformed to 4H. α-SiC powder grew moderately into plate-shaped grains. β-/SiC powder was completely transformed to 6H and subsequently 4H with large grain growth. Low-temperature sintering enabled us to use hot isostatic pressing resulting in pore-free SiC materials.

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.

scholarly journals Fabrication of Highly Transparent Y2O3 Ceramics with CaO as Sintering Aid

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 444
Author(s):  
Danlei Yin ◽  
Jun Wang ◽  
Meng Ni ◽  
Peng Liu ◽  
Zhili Dong ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Low Temperature ◽  
Microstructure Evolution ◽  
Hot Isostatic Pressing ◽  
Optical Transmittance ◽  
Densification Rate ◽  
Vacuum Sintering ◽  
Sintering Aid ◽  
Isostatic Pressing

Highly transparent Y2O3 ceramics were successfully fabricated with CaO as sintering aid. The microstructure evolution, optical transmittance, hardness and thermal conductivity of the Y2O3 ceramics were investigated. It was found that doping a small amount (0.01–0.15 wt.%) of CaO could greatly improve the densification rate of Y2O3. With an optimized CaO dosage of 0.02 wt.% combined with the low temperature vacuum sintering plus hot isostatic pressing (HIP-ing), Y2O3 ceramics with in-line transmittance of 84.87% at 1200 nm and 81.4% at 600 nm were obtained.

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.

Hot Isostatic Pressing (HIPing) of FeCralloy®-Reinforced Hydroxyapatite

2013 ◽  
Vol 17 ◽  
pp. 87-102 ◽  
Author(s):  
N. Ehsani ◽  
Andrew J. Ruys ◽  
Charles C. Sorrell
Keyword(s):  
Fracture Toughness ◽  
Plastic Deformation ◽  
Stainless Steel ◽  
Low Temperature ◽  
Hot Isostatic Pressing ◽  
Decomposition Temperature ◽  
Free Form ◽  
Pressureless Sintering ◽  
Fibre Reinforcement ◽  
Isostatic Pressing

The goal of this study was to produce hydroxyapatite (HAp), a bioactive biomaterial, in a decomposition-free form with fracture toughness comparable to bone by metal fibre-reinforcement. This goal was ultimately achieved. Glass encapsulation of FeCralloy®-reinforced HAp was an unsuccessful technique due to the excessive low-temperature volatilisation, which aerated the glass. Therefore a graphite/stainless steel encapsulation system was used in the present study. Hot isostatic pressing enabled the production of fully dense decomposition-free HAp with toughness improvements of 14 times (FeCralloy® fibres, optimally 15 vol%), comparable to cortical bone. Further, it was found that the HAp decomposition temperature was higher at 100 MPa (the HIPing pressure) than for pressureless sintering. Addition of the FeCralloy® fibre additive induced significant plastic deformation and ductile fracture of the hydroxyapatite.

scholarly journals Low-temperature Mechanical Properties of Bulk MgB2 Fabricated by Hot Isostatic Pressing

2015 ◽  
Vol 67 ◽  
pp. 982-986 ◽  
Author(s):  
A. Murakami ◽  
H. Teshima ◽  
T. Naito ◽  
H. Fujishiro ◽  
T. Kudo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Hot Isostatic Pressing ◽  
Isostatic Pressing ◽  
Bulk Mgb2
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