scholarly journals Effect of hot isostatic pressing on the microstructure and fracture toughness of laser additive-manufactured MoSiBTiC multiphase alloy

2020 ◽  
Vol 196 ◽  
pp. 109132 ◽  
Author(s):  
Weiwei Zhou ◽  
Kengo Tsunoda ◽  
Naoyuki Nomura ◽  
Kyosuke Yoshimi
Keyword(s):  
Fracture Toughness ◽  
Hot Isostatic Pressing ◽  
Isostatic Pressing ◽  
Multiphase Alloy

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.

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.

Strength and Toughness of Silicide Matrix Materials Consolidated by Hot Isostatic Pressing

1993 ◽  
Vol 322 ◽  
Author(s):  
R. Suryanarayanan ◽  
S. M. L. Sastry ◽  
K. L. Jerina
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Creep Resistance ◽  
Room Temperature ◽  
Hot Isostatic Pressing ◽  
Molybdenum Disilicide ◽  
High Temperature Strength ◽  
Isostatic Pressing ◽  
Temperature Fracture ◽  
Hip Process

AbstractSubstantial improvements have been reported in high temperature strength and creep resistance, and room temperature fracture toughness of molybdenum disilicide (MoSi2) reinforced with ductile or brittle reinforcements. The influence of Hot Isostatic Pressing (HIP) process parameters on the mechanical properties of MoSi2 based alloys was studied. Monolithic MoSi2 powder and MoSi2 powder blended with either niobium powder or silicon carbide whisker reinforcements were consolidated by HIP at 1200 − 1400°C, 207 MPa, and 1 - 4 hrs. The HIP'ed compacts were characterized for compression strength and creep resistance at 1100-1300°C. Fracture toughness was measured on single edge notched rectangular specimens at room temperature. Mechanical properties were correlated with post-HIP microstructural features.

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.

Mechanical Characterization and Wear Performance of WC – ZrO2 – Ni Cermets Produced by Hot Isostatic Pressing

2011 ◽  
Vol 214 ◽  
pp. 344-348 ◽  
Author(s):  
Irina Hussainova ◽  
Anton Smirnov ◽  
Maksim Antonov
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Mechanical Characterization ◽  
Hot Isostatic Pressing ◽  
Tetragonal Zirconia ◽  
Binder Content ◽  
Nickel Metal ◽  
Wear Performance ◽  
Isostatic Pressing ◽  
Metal Binder

Microstructure analysis and mechanical characterization were performed on newly developed WC based and yttria stabilized tetragonal zirconia (ZrO2) doped cermets with nickel metal binder produced by hot isostatic pressing. The cermets have reached higher than 99% of theoretical density after processing at 1700 0C and 206 MPa for 1 hour. Zirconia has appeared to form agglomerates of about 1 µm and suppressed carbide grains growth. Hardness of zirconia doped materials was of the same magnitude and fracture toughness was slightly higher as compared to conventionally produced WC-Co hardmetals of the same metal binder content while wear resistance in conditions of erosion and abrasion in silica media is increased by two fold.

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.

Fabrication of AlN-SiC-TiB2 Ceramics by Self-Propagating High Temperature Synthesis and Hot Isostatic Pressing

2007 ◽  
Vol 546-549 ◽  
pp. 1505-1508 ◽  
Author(s):  
Li Juan Zhou ◽  
Yong Ting Zheng ◽  
Shan Yi Du ◽  
Hong Bo Li
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Combustion Product ◽  
Bending Strength ◽  
Hot Isostatic Pressing ◽  
Temperature Synthesis ◽  
Powder Mixtures ◽  
Pressing Method ◽  
Isostatic Pressing ◽  
High Temperature Synthesis

The fabrication of AlN-SiC-TiB2 ceramics with powder mixtures of Al, 6H-SiC and TiB2 was investigated by self-propagating high temperature synthesis (SHS) and hot isostatic pressing (HIP). The powder mixtures were shaped by isostatic cool pressing method and the combustion reaction was carried at the pressure of 100-200 MPa N2 by an ignitor. The compositions and morphologies of the combustion product were studied by XRD and SEM. The determined bending strength and the fracture toughness of the ceramics were 350 MPa and 3.5 MPa⋅m1/2 respectively.

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