Journal of the Japan Society of Powder and Powder Metallurgy
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
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Volume 62, Issue 8
August
Displaying 1-15 of 15 articles from this issue
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Summarization
Paper
Paper
  • Effects of HIP Temperature on Properties of Ni-Cr-Mo-B P/M Alloy with High Corrosion and Wear Resistance
    Toshiyuki SAWADA
    2015 Volume 62 Issue 8 Pages 393-399
    Published: August 15, 2015
    Released on J-STAGE: August 26, 2015
    DOIhttps://doi.org/10.2497/jjspm.62.393
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    The effects of HIP temperature on the properties of Ni-Cr-Mo-B P/M material with Ni-22mass%Cr-26mass%Mo-1.5mass%B composition were investigated. Raw material powders were produced by gas atomization, followed by sieving under 500 μm in particle size. And then, the powders were consolidated by HIP. HIP consolidations were carried out at 1323, 1373 and 1423 K in temperature, at 147 MPa in pressure and for 5 h in holding time. All specimens consisted of γNi matrix and tetragonal M3B2 type complex boride. The complex borides were isolated and coarsened with increase of HIP temperature.
    Rockwell hardness decreased and bending strength increased with increasing HIP temperature. The variation in Charpy impact value as a function of HIP temperature showed the local maximum at 1373 K. Wear resistance by Ohgoshi-type abrasion test with low sliding speed improved with increasing HIP temperature. The complex borides in the specimen with low HIP temperature were so fine that these were considered to fall off from the sliding surface in the abrasion test.
    As a result of immersion tests, all examined Ni-Cr-Mo-B P/M materials showed higher corrosion resistance against both HCl and HF aqueous solutions than C-276 alloy.
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  • Analysis of Vibration Damping Mechanisms of Cu-Sn/Al2O3 Composite Material by Frequency Response Function of FFT Analyzer
    Minoru KASAI, Fumitaka FUJITSUKA, Atsushi HIBINO
    2015 Volume 62 Issue 8 Pages 400-407
    Published: August 15, 2015
    Released on J-STAGE: August 26, 2015
    DOIhttps://doi.org/10.2497/jjspm.62.400
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    In the fields of an eco-friendly automobile, an advanced industrial machine, and a precision electronic device, controlling of vibration damping behavior of the sintering parts obtained from powder metallurgy is required. In this paper, the vibration behavior of Cu-Sn/Al2O3 composite material made by powder metallurgy was investigated by a FFT analyzer.
    Cu, Sn, and Al2O3 powders were used as initial substances. The powders were mixed and pressed into a plate shaped compact with 200 MPa. Using a vacuum furnace, the green compact was sintered at 825-1075 °C for 1 hour. By changing the mixing ratio and the sintering temperature, some kinds of the composite material plates were produced. For the composite material obtained, microstructure observation, Vickers hardness test, compression test and vibration test were performed.
    The composite materials were consisted from the crystal grain of 15-69 μm, and the mixed Al2O3 particles were dispersed on the grain boundary. Additionally, twin crystal was also found in the composite materials. The damping coefficient of composite material depended on the mixing ratio of the raw powders and the sintering microstructure. The vibration damping behavior of the Cu-Sn/Al2O3 composite material was affected by solubility element, grain boundary, dispersoid particle, and twin crystal.
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  • Investigation of Chemical State of Vanadium at the Interface Between Thermal Sprayed Hydroxyapatite Coating and Ti-6Al-4V Alloy Substrate
    Takayuki MURAKAMI, Iwao NODA, Junji IKEDA, Atsushi NAKAHIRA
    2015 Volume 62 Issue 8 Pages 408-412
    Published: August 15, 2015
    Released on J-STAGE: August 26, 2015
    DOIhttps://doi.org/10.2497/jjspm.62.408
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    Generally, hydroxyapatite coating on Ti-6Al-4V orthopeadic implant is performed by the high temperature process such as for example plasma spraying or flame spraying. The chemical state of the vanadium at the boundary of Ti-6Al-4V substrate and hydroxyapatite coating layer sprayed by flame spraying was investigated. The adhesive strength between coating and substrate were measured, and the interface was investigated by scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDX). X-ray diffraction (XRD) and X-ray absorption near edge structure (XANES) spectrum show that the diffusion of vanadium element and titanium element was not detected at the interface between hydroxyapatite and Ti-6Al-4V substrate, and the existence of the new reaction phase was not also detected. It is suggested that vanadium exists in Ti-6Al-4V alloy.
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Special Issue: New Development of Sintered Materials to Correspond to Future Automobiles
Summarization
Memorial Lecture of JSPM Award
  • Development and Productization of High Performance Powder Metallurgy Materials
    Tetsuya HAYASHI, Terukazu TOKUOKA, Nobuya AMANO
    2015 Volume 62 Issue 8 Pages 415-421
    Published: August 15, 2015
    Released on J-STAGE: August 26, 2015
    DOIhttps://doi.org/10.2497/jjspm.62.415
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    The powder metallurgy process can achieve producing products with high-performance materials, and also it enables the product to have a high standard of dimensional precision compared to the Ingot metallurgy process. Therefore, sintered component products have been adopted for many automotive parts, and the number of these cases predicted to soar year after year. This paper shows two topics regarding the development and productization of advanced powder metallurgy products.
    One of the topics is about the aluminum-based high-performance alloy using rapid solidification aluminum alloy powders. Main features of this material are high strength, wear and abrasion resistance, and heat resistance. This material is used for the cylinder liner of motorcycle engines.
    The other topic is about the warm sizing technology, which is able to complete sizing process and attain high precision simultaneously by hardening a material while pressing in a die. This technology is applied for the parts of the high performance oil pump.
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Paper
  • Basic Study of Die Wall Friction in Ejection by Lateral Pressure Measurement with the Dual Partitioning Die in Compaction
    Taku IWAOKA, Yukiko OZAKI, Akira FUJIKI
    2015 Volume 62 Issue 8 Pages 422-430
    Published: August 15, 2015
    Released on J-STAGE: August 26, 2015
    DOIhttps://doi.org/10.2497/jjspm.62.422
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    In powder compaction, the ejection characteristics of green compact held in the die affect friction between the green compact side and die wall. The ejection characteristics are important factors for final formability of green compact. Therefore, this research studied factors that affect ejection friction. For ejection friction factors, we sought to measure lateral pressure that acts on the die wall, from compacting until ejection. We found that an increase in ejection friction coefficient does not necessarily increase ejection pressure. This phenomena was caused by lubricant that the compact supplies to the wall. By defining concrete material coefficient for powder, ejection characteristics have been explained. We found that powders with simpler shapes and/or lower yield strengths have superior ejection characteristics.
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  • Effect of Cr Content on the Magnetic Properties of Fe-Cr Soft Magnetic Material by MIM Process
    Yohei SANO, Toshiko OSADA, Kentaro KUDO, Fujio TSUMORI, Hideshi MIURA, ...
    2015 Volume 62 Issue 8 Pages 431-436
    Published: August 15, 2015
    Released on J-STAGE: August 26, 2015
    DOIhttps://doi.org/10.2497/jjspm.62.431
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    In recent years, the soft magnetic material parts have been widely used in the fields of industrial equipments, consumer electronics, automobiles, and so on. To fabricate these soft magnetic material parts, electrical steel and P/M method is normaly used. With the increase of fabricating complex shaped parts, processing method with more flexibility in design also be needed. For this reason, MIM process is hoped to be a near-net-shape, cost reduction and mass production method which can fabricate three-dimensional complex shaped parts. Fe-Cr-based soft magnetic material is developed in 1960s~1970s to be used in corrosive environments. Because it is less expensive than the PB permalloy. Mainly composition comprising a 13 %Cr or higher is used to make material stable. However, the maximum magnetic flux density of material decreases with increase of Cr content. In this research, the effect of Cr content on the magnetic properties under DC and AC magnetic field were investigated by mixing SUS430L alloy powder and iron powder.
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