A Review: Effect of Sintering Method on the Decomposition of Hydroxyapatite and Density of Hydroxyapatite Zirconia Composites

2013 ◽  
Vol 465-466 ◽  
pp. 843-846
Author(s):  
Chee Huan Leong ◽  
Andanastuti Muchtar ◽  
C.Y. Tan ◽  
Masfueh Razali
Keyword(s):  
Fracture Toughness ◽  
Mechanical Strength ◽  
Relative Density ◽  
Phase Stability ◽  
Biomedical Applications ◽  
Hot Isostatic Pressing ◽  
Experimental Results ◽  
Isostatic Pressing ◽  
Zirconia Composites ◽  
Sintering Method

Hydroxyapatite (HA) is a biomaterial with excellent biocompatibility. However, the brittleness and low fracture toughness of HA have limited its biomedical applications. As such, HA has been incorporated with zirconia (ZrO2) to enhance its mechanical strength. However, ZrO2 addition decreases the phase stability of HA. HA decomposition is not favored because it decreases the mechanical strength of HA/ZrO2. In this paper, the effect of sintering on HA decomposition is reviewed. Experimental results show that hot isostatic pressing of HA/ZrO2 is one of the most effective methods to suppress HA decomposition, yielding the highest relative density compared with other sintering methods.

Containerless Hot Isostatic Processing of Titanium Diboride Ceramics

1991 ◽  
Vol 251 ◽  
Author(s):  
Michael Concannon ◽  
Edwin S. Hodge ◽  
Christopher Turmel
Keyword(s):  
Fracture Toughness ◽  
Mechanical Strength ◽  
Titanium Diboride ◽  
Hot Isostatic Pressing ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Isostatic Pressing ◽  
Hot Isostatic Processing ◽  
Dense Titanium

ABSTRACTDense titanium diboride (TiB2) ceramics were fabricated by near-net processing based on containerless hot isostatic pressing. Resultant materials displayed good mechanical strength and high fracture toughness.

scholarly journals Evolution of the Microstructure and Mechanical Properties of a Ti35Nb2Sn Alloy Post-Processed by Hot Isostatic Pressing for Biomedical Applications

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1027
Author(s):  
Joan Lario ◽  
Ángel Vicente ◽  
Vicente Amigó
Keyword(s):  
Powder Metallurgy ◽  
Mechanical Strength ◽  
Room Temperature ◽  
Hot Isostatic Pressing ◽  
Phase Changes ◽  
Post Processing ◽  
Isostatic Pressing ◽  
Porosity Reduction ◽  
Processing Step ◽  
Hip Process

The HIP post-processing step is required for developing next generation of advanced powder metallurgy titanium alloys for orthopedic and dental applications. The influence of the hot isostatic pressing (HIP) post-processing step on structural and phase changes, porosity healing, and mechanical strength in a powder metallurgy Ti35Nb2Sn alloy was studied. Powders were pressed at room temperature at 750 MPa, and then sintered at 1350 °C in a vacuum for 3 h. The standard HIP process at 1200 °C and 150 MPa for 3 h was performed to study its effect on a Ti35Nb2Sn powder metallurgy alloy. The influence of the HIP process and cold rate on the density, microstructure, quantity of interstitial elements, mechanical strength, and Young’s modulus was investigated. HIP post-processing for 2 h at 1200 °C and 150 MPa led to greater porosity reduction and a marked retention of the β phase at room temperature. The slow cooling rate during the HIP process affected phase stability, with a large amount of α”-phase precipitate, which decreased the titanium alloy’s yield strength.

Hot isostatic pressing of platelet reinforced zirconia composites

1994 ◽  
pp. 397-403
Author(s):  
M. Poorteman ◽  
P. Descamps ◽  
F. Cambier ◽  
A. Leriche ◽  
B. Thierry
Keyword(s):  
Hot Isostatic Pressing ◽  
Isostatic Pressing ◽  
Zirconia Composites

Extremely dense microstructure and enhanced ionic conductivity in hot-isostatic pressing treated cubic garnet-type solid electrolyte of Ga2O3-doped Li7La3Zr2O12

2018 ◽  
Vol 11 (02) ◽  
pp. 1850029 ◽  
Author(s):  
Shiying Qin ◽  
Xiaohong Zhu ◽  
Yue Jiang ◽  
Ming’en Ling ◽  
Zhiwei Hu ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Solid Electrolyte ◽  
Relative Density ◽  
Solid Electrolytes ◽  
Hot Isostatic Pressing ◽  
Lithium Ion ◽  
Nominal Composition ◽  
Isostatic Pressing ◽  
Dense Microstructure ◽  
Ion Conducting

A large number of pores and a low relative density that are frequently observed in solid electrolytes reduce severely their ionic conductivity and thus limit their applicability. Here, we report on the use of hot isostatic pressing (HIP) for ameliorating the garnet-type lithium-ion conducting solid electrolyte of Ga2O3-doped Li7La3Zr2O[Formula: see text] (Ga-LLZO) with nominal composition of Li[Formula: see text]Ga[Formula: see text]La3Zr2O[Formula: see text]. The Ga-LLZO pellets were conventionally sintered at 1075[Formula: see text]C for 12[Formula: see text]h, and then were followed by HIP treatment at 120[Formula: see text]MPa and 1160[Formula: see text]C under an Ar atmosphere. It is found that the HIP-treated Ga-LLZO shows an extremely dense microstructure and a significantly enhanced ionic conductivity. Coherent with the increase in relative density from 90.5% (untreated) to 97.5% (HIP-treated), the ionic conductivity of the HIP-treated Ga-LLZO reaches as high as [Formula: see text][Formula: see text]S/cm at room temperature (25[Formula: see text]C), being two times higher than that of [Formula: see text][Formula: see text]S/cm for the untreated one.

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.

scholarly journals Study of Microstructure Features and Properties of Metals Obtained by Hot Isostatic Pressing

2021 ◽  
Vol 24 (4) ◽  
pp. 4-10
Author(s):  
A.A. Khlybov ◽  
D.A. Ryabov ◽  
M.S. Anosov ◽  
E.S. Belyaev
Keyword(s):  
Fractal Dimension ◽  
Relative Density ◽  
Metal Powder ◽  
Hot Isostatic Pressing ◽  
Microstructural Analysis ◽  
Fractal Dimensionality ◽  
Spherical Particles ◽  
Metal Powders ◽  
Isostatic Pressing ◽  
Different Temperatures

The aim of this research is to study the features of the structure and properties of alloys obtained using the technology of hot isostatic pressing (HIP) of metal powders. The study was carried out in the temperature range of interruption of the HIP cycle from 670 to 1150 °C on alloys 08Cr18Ni10Ti and Cr12MoV. For processing images of microstructures and assessing their fractal dimension, software has been developed in the MATLAB environment. The results of microstructural analysis of the metals under study showed that complete sintering of powders is observed at a HIP temperature of 1150 °C; at lower temperatures, pores and unsintered spherical particles of metal powder are observed in the microstructure of the alloys. The grain size of alloys obtained by HIP is determined, first of all, by the size of the initial fraction of the metal powder. Based on the results of evaluating the density of alloys obtained at different temperatures of the HIP, a relationship was established between the relative density of the alloy and the process temperature. Based on the results of fractal analysis, the relationship between the fractal dimensionality of the microstructure of the alloy and the HIP temperature and the relative density of the metals under study has been established. The obtained dependences are linear. The error in estimating the relative density from the obtained dependencies is, on average, 5 %. The data obtained in the course of the study make it possible to estimate the density of metals obtained by hot isostatic pressing of metal powders by evaluating the fractal dimension of the microstructure image.

SILICON CARBIDE SC-221

Alloy Digest ◽  
1991 ◽  
Vol 40 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
High Temperature ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Bending Strength ◽  
Beta Phase ◽  
Pressureless Sintering ◽  
Bend Strength ◽  
Sintering Method

Abstract SILICON CARBIDE SC-221 is a beta-phase silicon carbide made from the pressureless sintering method. It possesses excellent mechanical strength at high temperature (4-point bending strength of 71ksi [490 MPa] at 1400 C [2552 F]). This datasheet provides information on physical properties, hardness, elasticity, and bend strength as well as fracture toughness. Filing Code: Cer-5. Producer or source: Kyocera America Inc..

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