scholarly journals Micropore Distribution Change of Heated Powder Compacts Using Binary Alumina Powder Mixtures

1990 ◽  
Vol 98 (1133) ◽  
pp. 29-35 ◽  
Author(s):  
Seiichi TARUTA ◽  
Kiyoshi OKADA ◽  
Nozomu OTSUKA
Keyword(s):  
Alumina Powder ◽  
Powder Mixtures ◽  
Distribution Change ◽  
Powder Compacts

Liquid phase sintering of bimodal size distributed alumina powder mixtures

1996 ◽  
Vol 31 (3) ◽  
pp. 573-579 ◽  
Author(s):  
S. Taruta ◽  
T. Takano ◽  
N. Takusagawa ◽  
K. Okada ◽  
N. Ōtsuka
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Sintering ◽  
Alumina Powder ◽  
Powder Mixtures

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

Synthesis of Quasicrystal Phases by Mechanical Alloying of Ti45+xZr38-XNi17 (-4≤ X ≤16) Powder Mixtures, and Their Hydrogen Storage Properties

2003 ◽  
Vol 805 ◽  
Author(s):  
Akito Takasaki ◽  
Naoki Imai ◽  
Kenneth F. Kelton
Keyword(s):  
Mechanical Alloying ◽  
Hydrogen Desorption ◽  
Lattice Parameter ◽  
Hydrogen Atoms ◽  
Powder Mixtures ◽  
Hydrogen Storage Properties ◽  
Crystal Phases ◽  
Powder Compacts ◽  
Storage Properties ◽  
Type Crystal

ABSTRACTMechanical alloying of Ti45+xZr38-xNi17 (-4 ≤ x ≤ 16) elemental powder mixtures leads to the formation the amorphous phase, but subsequent annealing at 833 K causes the formation of icosahedral (i) quasicrystal and the Ti2Ni-type crystal phases. The α-Ti phase is also produced in Ti-rich powders after annealing. Both the quasilattice constant of the i-phase and the lattice parameter of the Ti2Ni-type crystal phase decrease monotonically with increasing substituted amount of Ti because of the smaller radius of the Ti atom. The maximum hydrogen concentration in the i-phase in all powder compacts, after electrochemical hydrogenation in a KOH solution, is almost the same, about 63 at% ([H] / [M] ≈ 1.7). The onset temperature of hydrogen desorption is about 570 K (at a heating rate of 5 K/min) for all powders, but the temperature for the maximum hydrogen desorption rate increases with increasing Ti concentration in the powders, suggesting that some hydrogen atoms might be more strongly bound in the quasilattice where the original Zr sites become occupied by Ti atoms.

Effect of Additives on Packing and Sintering of Bimodal Size-Distributed Alumina Powder Mixtures

1995 ◽  
Vol 111-112 ◽  
pp. 321-340 ◽  
Author(s):  
S. Taruta ◽  
Y. Itou ◽  
K. Kawashima ◽  
Koichi Kitajima ◽  
N. Takusagawa ◽  
...  
Keyword(s):  
Alumina Powder ◽  
Powder Mixtures ◽  
Effect Of Additives

Sintering Shrinkage Anisotropy of Spherical Alumina Powder Compacts with Particle Orientation

2007 ◽  
Vol 334-335 ◽  
pp. 293-296 ◽  
Author(s):  
Yan Chun Liu ◽  
An Ze Shui ◽  
Xue Tan Ren ◽  
Ling Ke Zeng
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Field Direction ◽  
Particle Orientation ◽  
Alumina Powder ◽  
Magnetic Field Direction ◽  
Axis Direction ◽  
Powder Compacts ◽  
Sintering Shrinkage ◽  
Spherical Alumina

Spherical alumina powder and dispersant were mixed with distilled and deionized water, and ball milled to make alumina slurry. The slurry was dried in a high magnetic field to make a compact. Subsequently, the compact was cold-isostatic-pressed (CIP) to enhance the homogeneity in particle packing density. Anisotropy of shrinkage during sintering was examined for the alumina compacts in detail. Particle orientation existed in the spherical alumina powder compacts prepared in 10T, and made them shrink anisotropically during sintering. Sintering shrinkage was larger in the direction parallel to magnetic field direction (i.e., the c-axis direction of alumina crystal) than that in its perpendicular direction. The particle orientation structure in the compacts was confirmed with the immersion liquid method of polarized light microscope, and the grain alignment structure in the sintered bodies was also observed with X-ray diffraction, the c-plane was perpendicular to the magnetic field direction. On the other hand, isotropic sintering shrinkage occurred in the spherical alumina powder compacts prepared in 0T, which did not hold the particle orientation. The experimental results indicate that sintering shrinkage of spherical alumina powder compact depends on alumina crystal axis direction. Origin of the sintering shrinkage anisotropy for the spherical alumina powder compacts can be attributed to the particle orientation caused by high magnetic field.

scholarly journals Slip Casting of Alumina Powder Mixtures with Bimodal Size Distribution

1996 ◽  
Vol 104 (1209) ◽  
pp. 447-450 ◽  
Author(s):  
Seiichi TARUTA ◽  
Nobuo TAKUSAGAWA ◽  
Kiyoshi OKADA ◽  
Nozomu OTSUKA
Keyword(s):  
Size Distribution ◽  
Slip Casting ◽  
Alumina Powder ◽  
Bimodal Size Distribution ◽  
Powder Mixtures
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