• Title/Summary/Keyword: zirconium

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Cutting Characteristics of the ZrN Coated Tool (지르코늄 코팅공구의 절삭특성)

  • Seol Han-Wook;Kim Joo-Hyun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.1
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    • pp.17-22
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    • 2006

  • Zirconium is widely applied in industrial area. In this study, the exeperiments are performed to investigate the differences in cutting characteristics of zirconium coated material which deposited on cutting tool using physical vapor deposition(PVD). For comparison, TiN coated tool is used to compare with zirconium coated tool. Experimental results were compared for tool wear, surface roughness and cutting force. The tool wear of PVD coated bites is affected by the various cutting conditions. This new stuff 'zirconium coated tool' wears $33\%$ less and improves surface roughness $23\%$ more in various cutting conditions. Cutting force is analyzed by using various workpiece, and the research strongly confirms that 'zirconium' remains better condition than 'titanium'. As a result 'zirconium' coated tool can be performed far better than 'titanium' coated tool on metal cutting.

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Physical and Chemical Investigation of Substrate Temperature Dependence of Zirconium Oxide Films on Si(100)

  • Chun, Mi-Sun;Moon, Myung-Jun;Park, Ju-Yun;Kang, Yong-Cheol
    • Bulletin of the Korean Chemical Society
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    • v.30 no.11
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    • pp.2729-2734
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    • 2009

  • We report here the surface behavior of zirconium oxide deposited on Si(100) substrate depending on the different substrate temperatures. The zirconium oxide thin films were successfully deposited on the Si(100) surfaces applying radio-frequency (RF) magnetron sputtering process. The obtained zirconium oxide films were characterized by X-ray photoelectron spectroscopy (XPS) for study about the chemical environment of the elements, X-ray diffraction (XRD) for check the crystallinity of the films, spectroscopic ellipsometry (SE) technique for measuring the thickness of the films, and the morphology of the films were investigated by atomic force microscope (AFM). We found that the oxidation states of zirconium were changed from zirconium suboxides ($ZrO_{x,y}$, x,y < 2) (x; higher and y; lower oxidation state of zirconium) to zirconia ($ZrO_2$), and the surface was smoothed as the substrate temperature increased.

  • https://doi.org/10.5012/bkcs.2009.30.11.2729 인용 PDF KSCI

Characterization of Zirconium Sulfate Supported on Zirconia and Activity for Acid Catalysis

  • Son, Jong Rak;Gwon, Tae Dong;Kim, Sang Bok
    • Bulletin of the Korean Chemical Society
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    • v.22 no.12
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    • pp.1309-1315
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    • 2001

  • Zirconium sulfate supported on zirconia catalysts were prepared by impregnation of powdered $Zr(OH)_4$ with zirconium sulfate aqueous solution followed by calcining in air at high temperature. The characterization of prepared catalysts was performed using Fourier transform infrared (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and by the measurement of surface area. The addition of zirconium sulfate to zirconia increased the phase transition temperature of $ZrO_2$ from amorphous to tetragonal due to the interaction between zirconium sulfate and zirconia, and the specific surface area and acidity of catalysts increased in proportion to the zirconium sulfate content up to 10 wt% of $Zr(SO_4)_2$. Infrared spectra of ammonia adsorbed on $Zr(SO_4)2}ZrO_2$ showed the presence of Bronsted and Lewis acid sites on the surface. $10-Zr(SO_4)_2}ZrO_2$ calcined at $600^{\circ}C$ exhibited maximum catalytic activities for 2-propanol dehydration and cumene dealkylation. The catalytic activities for both reactions were correlated with the acidity of catalysts measured by ammonia chemisorption method.

  • https://doi.org/10.5012/bkcs.2001.22.12.1309 인용 PDF