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  • 1
    Online Resource
    Online Resource
    The Electrochemical Society ; 2016
    In:  ECS Meeting Abstracts Vol. MA2016-02, No. 14 ( 2016-09-01), p. 1372-1372
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2016-02, No. 14 ( 2016-09-01), p. 1372-1372
    Abstract: Chemical vapor deposited (CVD) or physical vapor deposited (PVD) hard coating technique is widely used the cemented-tungsten carbide (WC-Co) for molds and cutting tools, which plays an important role in a lot of manufacturing industry. For example, titanium carbide (TiC), titanium nitride (TiN) and titanium carbonitride (TiCN) is one of the candidates to control surface properties in order to increase lifetime or to decrease friction coefficient of molds, tools and so on. The film prepared by thermal CVD carried out around 1000°C has good uniformity and mechanical properties, which restricts substrates having low melting points, and also causes deformation of substrates. High temperature sometimes results in decarbonization of WC-Co surface which causes a significant decrease in toughness and transverse rupture strength. Plasma enhanced chemical vapor deposition (PECVD) or PVD has some merits as lower deposition temperature ( 〈 500°C) than thermal CVD and high through-put, however, the film usually has low adhesion strength. Then, life of molds and cutting tools obtained PVD are sometimes shorter than that with CVD. In this study, Several surface pretreatment methods were investigated to remove Co from the WC-Co surface and to increase surface roughness to enhance adhesion strength. The procedure include, Dry etching by CF 4 plasma for 15 to 120min in the substrate temperature range from R.T. to 500°C. Chemical treatment with aqua regia (3HCl:HNO 3 ) for 5 min at 25 to 60°C. After pretreatment, TiC coatings were formed by sputtering with TiC target or by PECVD from TiCl 4 /CH 4 . Surface roughness was evaluated by AFM. Crystallographic structure of WC-Co and TiC was evaluated by XRD. Hardness was evaluated by dynamic nanoindenter. Atomic concentration was determined by XPS. Figure 1 shows maximum height roughness (Rz) and arithmetic average roughness (Ra) of WC-Co substrates after pretreatment. Rz and Ra got larger as increasing temperature of treatment conditions. In particular, substrate surface with aqua regia treatment at 60°C disappear Co peak. Scratch test for PVD TiC coating on pretreated substrate revealed that critical load was larger than that with the film on non-pretreated substrate. When Ra was 150 nm, critical load was over 30N. The pretreated substrates surface by CF 4 plasma and aqua regia have similar Ra value as 150 nm, however, the film with CF 4 plasma exhibited no delamination and the film aqua regia exhibited delamination. The opposite trend could be due to the micro-level morphologies. The differences between PVD and CVD films will be discussed. Figure 1
    Type of Medium: Online Resource
    ISSN: 2151-2043
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2016
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  • 2
    Online Resource
    Online Resource
    The Electrochemical Society ; 2019
    In:  ECS Meeting Abstracts Vol. MA2019-02, No. 38 ( 2019-09-01), p. 1763-1763
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2019-02, No. 38 ( 2019-09-01), p. 1763-1763
    Abstract: Fuel Cell Vehicle became commercially available in 2014. The domestic sales volume of accumulation arrived at approximately 3,000, and the hydrogen stations also spread more than 100 places. On the other hand, the residential fuel cell system "ENE-FARM" commercialized in 2009 breaks through 270,000 accumulation, and spread steadily. It may be said that the step to the spread of FCV and ENE-FARM which led the world was not only the effort of the individual companies but also big result of the precise and extensive action by government supports and the university-industry research collaboration. They have continued activities, for example formulation of the road map, research and development, and demonstration test, for more than ten years since 2000. In “The Strategic Road Map for Hydrogen and Fuel Cells,” as for the accumulation sales target of FCV is 800,000 vehicles in 2030 and 200,000 vehicles in 2025. For the ENE-FARM, it is 5,300,000 units in 2030. Also, new use expansion of fuel cells mainly on the mobility is declared. Research and development for the realization of fuel cell which has high performance, high durability and low cost serve a vital role in. In advance of the development of such fuel cell technology, the challenging target for stack and elemental technology has been set in “NEDO's Technology Development Roadmap 2017” for vehicle type expansion of FCV and the use expansion to other mobility. Although it opened the door of the practical use by the steady action of public and private sectors, substantiation of these technical targets becomes indispensable for the high popularization and expansion use area such as the statement above. This report clarified performance target of the Fuel Cell Stack in 2040 to realize NEDO's Technology Development Roadmap 2017. The aims are the cell performance of 1.1 V at 0.2 A/cm 2 and 0.85 V at 4.4 A/cm 2 . In addition, by the test calculation using the best characteristic value among various materials reported in past articles, 1‒ 10 showed that accomplishment of the target in 2040 would be difficult. However, calculation using the maximum value which could be expected theoretically showed that this target value could be realized. Hopefully, this report will help researchers who challenge future issues of the fuel cell and realizing the challenging targets. References 1. Nonoyama and Y. Ikogi, ECS Trans ., 16 (2), 13 (2008). 2. M. Shibata, Toyota 2018 Fuel Cell Research Workshop . 3. L. Bu, N. Zhang, S. Guo, X. Zhang, J. Li, J. Yao, T. Wu, G. Lu, J-Y. Ma, D. Su, and X. Huang, Science , 354 , 1414 (2016). 4. V. Yarlagadda, M. K. Carpenter, T. E. Moylan, R. S. Kukreja, R. Koestner, W. Gu, L. Thompson, and A. Kongkanand, ACS Energy Lett ., 3 , 618 (2018) 5. R. L. Perry, US Patent 20130245219, A012013 6. A. Kusogle and A. Z. Weber, Chem. Rev ., 1 17 , 987 (2017). 7. J. Park, U. Pasaogullari, and L. J. Bonville, ECS Trans ., 64 (3), 353 (2014). 8. B. Avasarala and P. Haldar, J. Power Sources , 188 , 225 (2009). 9. V. Viswanathan, H. A. Hansen, J. Rossmeisl, and J. K. Nørskov, ACS C atal ., 2 , 1654 (2012). 10. Y. S. Kim, 2018 DOE A nnual M erit R eview , FC146 (June 13-15, 2018). Figure 1
    Type of Medium: Online Resource
    ISSN: 2151-2043
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2019
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  • 3
    Online Resource
    Online Resource
    The Electrochemical Society ; 2009
    In:  ECS Transactions Vol. 16, No. 25 ( 2009-03-20), p. 87-90
    In: ECS Transactions, The Electrochemical Society, Vol. 16, No. 25 ( 2009-03-20), p. 87-90
    Abstract: We have examined the effects of chelating agents and anti-sintering aids for the preparation of perovskite-type oxide fine powders by a polymer precursor method at low temperature. The single SmFeO3 phase was obtained at the low temperature of 600ºC by using ethylenediamine for chelating agent, however the specific surface area of the powders obtained at low temperature still showed relatively small surface areas due to sintering. Therefore, anti-sintering aids were tried to use at calcining process. It was found that the use of anti-sintering aid at calcining process not only prevented the sintering but also lowered the calcination temperatures to obtain a single phase perovskite-type oxide.
    Type of Medium: Online Resource
    ISSN: 1938-5862 , 1938-6737
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2009
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  • 4
    Online Resource
    Online Resource
    The Electrochemical Society ; 2019
    In:  ECS Transactions Vol. 92, No. 8 ( 2019-07-03), p. 3-7
    In: ECS Transactions, The Electrochemical Society, Vol. 92, No. 8 ( 2019-07-03), p. 3-7
    Type of Medium: Online Resource
    ISSN: 1938-6737 , 1938-5862
    Language: English
    Publisher: The Electrochemical Society
    Publication Date: 2019
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  • 5
    Online Resource
    Online Resource
    The Electrochemical Society ; 2008
    In:  ECS Meeting Abstracts Vol. MA2008-02, No. 2 ( 2008-08-29), p. 304-304
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2008-02, No. 2 ( 2008-08-29), p. 304-304
    Abstract: Abstract not Available.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2008
    detail.hit.zdb_id: 2438749-6
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  • 6
    Online Resource
    Online Resource
    The Electrochemical Society ; 2008
    In:  ECS Meeting Abstracts Vol. MA2008-02, No. 40 ( 2008-08-29), p. 2569-2569
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2008-02, No. 40 ( 2008-08-29), p. 2569-2569
    Abstract: Abstract not Available.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2008
    detail.hit.zdb_id: 2438749-6
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