The contact section of powder compacts and sintered bodies, and the values of their mechanical properties related to the contact section

1964 ◽  
Vol 2 (4) ◽  
pp. 278-281
Author(s):  
M. Yu. B al'nshin
Keyword(s):  
Mechanical Properties ◽  
Powder Compacts ◽  
Contact Section

Compressive mechanical properties of porous alumina powder compacts

2014 ◽  
Vol 40 (1) ◽  
pp. 2315-2322 ◽  
Author(s):  
Yoshihiro Hirata ◽  
Taro Shimonosono ◽  
Tatsuoki Sameshima ◽  
Soichiro Sameshima
Keyword(s):  
Mechanical Properties ◽  
Porous Alumina ◽  
Alumina Powder ◽  
Powder Compacts

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 Fabrication of TiN Particle-Dispersed Al2O3 Composites Utilizing High N2-Pressure SHS

2011 ◽  
Vol 13 (3-4) ◽  
pp. 115
Author(s):  
Ken Hirota ◽  
Hajime Yagura ◽  
Katsuya Takaoka ◽  
Masaki Kato
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Thermal Decomposition ◽  
High Pressure ◽  
Bending Strength ◽  
Hot Isostatic Pressing ◽  
Mixed Powder ◽  
Second Stage ◽  
Powder Compacts ◽  
Tin Content

<p>Fabrication of fine TiN particle-dispersed dense Al<sub>2</sub>O<sub>3</sub> composites with the compositions of Al<sub>2</sub>O<sub>3</sub>/TiN=100/0~90/10 vol% has been conducted from Al<sub>2</sub>O<sub>3</sub>/(Ti,TiN<sub>0.3</sub>) mixed powder compacts by capsule-free hot isostatic pressing (HIP) utilizing high-pressure N<sub>2</sub> SHS. Fine Ti powders (φ ~ 0.3 μm) with TiN<sub>0.3 </sub>phase were prepared by thermal decomposition of planetary ball-milled fine TiH<sub>2</sub> powders at 400°C (673 K) for 1 h in a vacuum, followed by heating in N<sub>2</sub> at 200 °C (473 K) for 2 h. The Al<sub>2</sub>O<sub>3</sub> powder compacts (relative densities of 57.2-57.8%) with homogeneously dispersed (Ti,TiN<sub>0.3</sub>) particles were prepared. The mixed powder compacts were hot isostatically pressed (HIPed) under the conditions of 1350°C (1623 K) at 7 MPa N<sub>2 </sub>for 1 h, followed by the heating at the same temperature for 2 h under 196 MPa-N<sub>2</sub>. At the first stage of heating [1350°C (1623K)/7MPa/1h], solid/gas reaction of SHS between (Ti,TiN<sub>0.3</sub>) and N<sub>2</sub> was introduced to form TiN and densification of the Al<sub>2</sub>O<sub>3</sub> powder compacts up to the relative density of 92-93% with closed pores was performed. And at the sequent second stage [1350 °C (1623K)/196MPa/2h], densification of the most of pre-sintered composites consisting of Al<sub>2</sub>O<sub>3</sub> and TiN reached higher relative densities than 98.5%. Dispersion of TiN particles (~φ 0.30 μm) in the composites suppressed the grain growth of Al<sub>2</sub>O<sub>3</sub> during HIP-sintering. Mechanical properties, such as bending strength (σ<sub>b</sub>), Vickers hardness (<em>H</em><sub>V</sub>), fracture toughness (<em>K</em><sub>1C</sub>), and electrical resistivity (ρ) of the composites were evaluated as a function of TiN content; the maximum values of σ<sub>b</sub>=640 MPa, <em>H</em><sub>V</sub>=19.5 GPa, and <em>K</em><sub>IC</sub>=4.5 MPa・m<sup>1/2 </sup>were obtained in the Al<sub>2</sub>O<sub>3</sub>/TiN=97/3~95/5 vol% composites. Among the composites, the lowest ρ value of 2.6×10<sup>3</sup> Ω・m was attained at Al<sub>2</sub>O<sub>3</sub>/TiN=90/10 vol% composite.</p>

scholarly journals The Preparation of Dense Materials in the MgO–ZrO2 System by the Application of Nanometric Powders

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5478
Author(s):  
Kamil Wojteczko ◽  
Krzysztof Haberko ◽  
Katarzyna Berent ◽  
Paweł Rutkowski ◽  
Mirosław M. Bućko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Processing Method ◽  
The Novel ◽  
Hydrothermal Conditions ◽  
Heating And Cooling ◽  
Applied Technology ◽  
Magnesia Content ◽  
Novel Processing ◽  
Powder Compacts ◽  
Zro2 System

Crystallization under hydrothermal conditions allowed us to prepare nanometric powders in the MgO–ZrO2 system of different magnesia concentrations. Sintering runs of these powder compacts studied using dilatometry measurements during heating and cooling revealed essential differences in their behavior. The microstructure of the resulting polycrystal is strongly related to the magnesia content in the starting powder, which strongly influences the phase composition of the resulting material and its mechanical properties. It should be emphasized that the novel processing method of such materials differs from the usual applied technology and leads to magnesia–zirconia materials of a different microstructure than that of “classical” materials of this kind.

Effects of extrusion conditions on mechanical properties in ZrAlNiCu glassy powder compacts

1996 ◽  
Vol 219 (1-2) ◽  
pp. 39-43 ◽  
Author(s):  
Yoshihito Kawamura ◽  
Hidemi Kato ◽  
Akihisa Inoue ◽  
Tsuyoshi Masumoto
Keyword(s):  
Mechanical Properties ◽  
Powder Compacts
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