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82 results on '"Hayakawa, Motozo"'

5. Experimental study on the mechanism of lubrication in hydrodynamic porous thrust bearings with a wavy surface

Author

Ohtsuka, Shigeru and Hayakawa, Motozo

Subjects
Lubrication systems -- Research, Porous materials -- Research, Bearings (Machinery) -- Research, Surfaces (Technology) -- Research, Science and technology
Abstract

Hydrodynamic fluid lubrication theory is applied to thrust bearings with three-dimensional, wave-shaped axial end surfaces. Optimizations of the wave height and surface porosity are experimentally determined using lubrication characteristics such as the friction coefficient and worn-out surface conditions. Lubrication characteristics such as the friction coefficient, temperature rise, thrust flotation, and oil consumption rate are evaluated for an estimation of life expectancy. In this research, the results of this theoretical application on thrust bearings clearly showed considerable improvement over conventional thrust bearings. Furthermore, this experimental research has clarified the lubrication conditions of various thrust-loaded axial end surfaces.

Published
1999

10. Strain-Magnetization Properties and Domain Structure Change of Silicon Steel Sheets Due to Plastic Stress

Author

Notoji, Atsushi, Hayakawa, Motozo, and Saito, Akihiko

Subjects
Ferromagnetism -- Research, Ferrosilicon -- Testing, Magnetic materials -- Testing, Domain structure -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

The effects of tensile stress and strain on magnetization and magnetic domains in silicon steel sheets were investigated. The strain-magnetization properties of plastic deformation regions under stress showed peculiar characteristics. We observed lancet domains in a sample after removing plastic stress, and found that the appearance of lancet domains was the cause of peculiar stress magnetization characteristics. Index Terms--Domain, lancet, magnetization, silicon iron.

Published
2000

29. Journal of JSEE

Author

KONDO, Yasuo, primary, MIYACHIKA, Kouitsu, additional, TANAKA, Hisataka, additional, OKAMOTO, Hisaki, additional, ONO, Yu-ichi, additional, AKAO, Takahiro, additional, KISHI, Takeyasu, additional, and HAYAKAWA, Motozo, additional

Published
2003
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47. Strain-Magnetization Properties and Domain Structure Change in Silicon Steel Sheets Due to Plastic Stress.

Author

Notoji, Atsushi and Hayakawa, Motozo

Subjects
*SILICON steel, *MAGNETIZATION, *FERROMAGNETIC materials, *MAGNETIC domain, *PLASTICS, *MAGNETIC properties
Abstract

Presents information on a study which examined the effects of tensile stress and strain on magnetization and magnetic domains in silicon steel sheets. Characteristics of the strain-magnetization properties of plastic deformation regions; Appearance of lancet domains; Methodology; Results and discussion.

Published
2000
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49. 3Y-TZP/Si2N2O Composite Obtained by Pressureless Sintering

Author

Santos, Carlos A. Xavier, Hayakawa, Motozo, and Bressiani, José Carlos

Abstract

Y-TZP presents excellent properties at room temperature but these properties decrease as the temperature increases. This paper studies the behavior 20vol%Si3N4-SiC when added in YTZP matrix and heated under no pressure system. Al2O3 and Y2O3 were used to maintain the stability of the matrix and as sintering aids. The addition of Si3N4 and SiC in a Y-TZP matrix leads to formation of silicon oxynitride and it increases the mechanical properties like toughness and hardness. The mixture was milled and molded by CIP. Samples were heated at 1500ºC, 1600ºC and 1700ºC for 2h without pressure under atmospheric conditions in bed-powders of Si3N4. Samples were characterized by XRD. Density, hardness, toughness, bending strength were measured. The structure of the material was observed in SEM/EPMA to verify the distribution of the materials in the composite. The formation of Si2N2O was observed in the sintered material and it showed an increment of both hardness and toughness as temperature increases. The samples presented considerable resistance of oxidation at 1000ºC.

Published
2008
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50. Grain Growth Behavior of Al2O3-ZrO2 with a Small Amount of Zirconia

Author

Nagashima, M. and Hayakawa, Motozo

Abstract

Grain growth behavior in Al2O3 with a small amount of ZrO2 (< 5 vol%) was examined. Grain growth of Al2O3 was retarded by zirconia particles, despite the small amount of added zirconia. The fraction of the zirconia particles embedded within alumina grains (intragranular zirconia particles) increased with decreasing zirconia content and increasing sintering temperature. Grain growth inhibition of alumina in the Al2O3-ZrO2 showed good agreement with the prediction of modified Zener’s pinning effect by the zirconia particles on grain boundaries.

Published
2007
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