Preparation of MgO-1.5Al$lt;inf$gt;2$lt;/inf$gt;O$lt;inf$gt;3$lt;/inf$gt; Transparent Ceramic by Pressureless Sintering and Hot Isostatic Pressing

2015 ◽  
Vol 30 (8) ◽  
pp. 843 ◽  
Author(s):  
YUAN Ze ◽  
WANG Hao ◽  
TU Bing-Tian ◽  
LIU Xin ◽  
XU Chun-Lai ◽  
...  
Keyword(s):  
Hot Isostatic Pressing ◽  
Transparent Ceramic ◽  
Pressureless Sintering ◽  
Isostatic Pressing

Hydroxyapatite Matrix Composites by Hot Isostatic Pressing: Part 2. Zirconia Fibre and Powder Reinforced

2012 ◽  
Vol 15 ◽  
pp. 85-100 ◽  
Author(s):  
N. Ehsani ◽  
C.C. Sorrell ◽  
A.J. Ruys
Keyword(s):  
Hot Isostatic Pressing ◽  
Decomposition Temperature ◽  
Pressureless Sintering ◽  
Matrix Composites ◽  
Isostatic Pressing ◽  
Natural Bone ◽  
Zirconia Fibre ◽  
Addition Level ◽  
Toughness Improvement

The Aim of the Project Was to Enhance the Fracture Toughness of Hydroxyapatite to a Level Comparable to that of Natural Bone for in Vivo Applications. to this Aim, the Effect of Various Parameters, Were Studied. Fully Dense Decomposition-Free Hap Matrix Composite Was Produced Using Hot Isostatic Pressing Technique. A Graphite/stainless Steel Encapsulation System Was Found to Be an Appropriate Method. Glass Encapsulation Was Unsuccessful Technique due to the Excessive Low-Temperature Volatilisation, which Aerated the Glass. Toughness Improvement Was 2.7 Times for PSZ Fibres, and 2.4 Times for PSZ Powder. the Optimal Addition Level of PSZ Fibre and PSZ Powder Was 20 Vol% and ~30 Vol% Respectively. Further, it Was Found that the Hap Decomposition Temperature Was Higher at 100 Mpa (the Hiping Pressure) than for Pressureless Sintering. the Toughening Effect of the Additives Induced Plastic Deformation and Ductile Fracture.

Processing and Properties of Nanocrystalline Tetragonal Zirconia

2007 ◽  
Vol 336-338 ◽  
pp. 2300-2303 ◽  
Author(s):  
Martin Trunec ◽  
Karel Maca
Keyword(s):  
Fracture Toughness ◽  
Pore Size ◽  
Hot Isostatic Pressing ◽  
Tetragonal Zirconia ◽  
Cold Isostatic Pressing ◽  
Pressureless Sintering ◽  
Isostatic Pressing ◽  
Average Grain Size ◽  
Zirconia Nanopowders ◽  
Sintering Behaviour

Zirconia nanopowders (stabilized by 1.5 and 3 mol% Y2O3) with particle size below 10 nm were compacted by cold isostatic pressing. Pressureless sintering and hot isostatic pressing were applied to obtain dense nanocrystalline ceramics. The influence of the pore size in powder compacts on sintering behaviour was investigated. Green bodies pressed at 1000 MPa had a maximum pore size of 5 nm. These bodies were densified to a relative density of over 99.6% with an average grain size about 85 nm by pressureless sintering at 1100 °C. Indentation techniques were used to evaluate the hardness and fracture toughness of zirconia nanoceramics. The decrease in the yttria content from 3 to 1.5 mol% resulted in the toughness increasing from 5.3 to 11.1 MPa m1/2. The differences in fracture toughness of zirconia ceramics prepared with different yttria contents and by different sintering methods were discussed and their possible causes were proposed.

Processing and properties of biphasic calcium phosphates bioceramics obtained by pressureless sintering and hot isostatic pressing

2013 ◽  
Vol 33 (7) ◽  
pp. 1263-1270 ◽  
Author(s):  
Michel Descamps ◽  
Laurent Boilet ◽  
Gérard Moreau ◽  
Arnaud Tricoteaux ◽  
Jianxi Lu ◽  
...  
Keyword(s):  
Calcium Phosphates ◽  
Hot Isostatic Pressing ◽  
Pressureless Sintering ◽  
Isostatic Pressing

PRESSURELESS SINTERING AND HOT ISOSTATIC PRESSING OF Ti3Al-Al2O3 INTERPENETRATING COMPOSITES

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3848-3853 ◽  
Author(s):  
CHING ZEN HAN ◽  
DELIANG ZHANG ◽  
IAN BROWN
Keyword(s):  
Vickers Hardness ◽  
Composite Powder ◽  
Hot Isostatic Pressing ◽  
Pressureless Sintering ◽  
Reaction Sintering ◽  
Microstructure Development ◽  
Closed Porosity ◽  
Composite Powders ◽  
Isostatic Pressing ◽  
Before And After

Interpenetrating phase Ti 3 Al - Al 2 O 3 composites have been fabricated by reaction sintering of composite powders containing Al and TiO 2 discus milled for two hours using carefully controlled heat-treatment in non-oxidizing atmospheres. Pressureless sintering has been carried out in argon at temperatures between 1330°C and 1480°C and a heating rate of 5°C/min prior to hot isostatic pressing at 200MPa for two hours at 1350°C. Densification of the composites was investigated as a function of temperature before and after hot isostatic pressing. The microstructure development and mechanical properties such as Vickers hardness of near fully dense Ti 3 Al - Al 2 O 3 composites fabricated by sinter-HIP of Al - TiO 2 composite powder were examined. An increase in Vickers hardness was observed after hot isostatic pressing, which can be attributed to the decrease of closed porosity in the composites. Vickers hardness of 11.0±1.0 GPa was achieved for the near fully dense composite produced by pressureless sintering at 1480°C, while 12.6±1.0 GPa was achieved for the near fully dense composite further subjected to hot isostatic pressing.

Hot isostatic pressing of MgAlON transparent ceramic from carbothermal powder

2018 ◽  
Vol 44 (4) ◽  
pp. 4512-4515 ◽  
Author(s):  
Benyuan Ma ◽  
Wei Zhang ◽  
Yuezhong Wang ◽  
Xiumin Xie ◽  
Haizhi Song ◽  
...  
Keyword(s):  
Hot Isostatic Pressing ◽  
Transparent Ceramic ◽  
Isostatic Pressing

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.

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