• Title, Summary, Keyword: Zr

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Fabrication and Physical Properties of ZrO2(m)-Al2O3ZrO2(t)-Al2O3 Structural Ceramics (ZrO2(m)-Al2O3ZrO2(t)-Al2O3 세라믹스의 제조와 물리적 특성)

  • Park, Jae-Sung;Park, Ju-Tae;Park, Jung-Rang
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.4
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    • pp.140-148
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    • 2010
  • The effects of the addition of either monoclinic $ZrO_2(ZrO_2(m))$ or tetragonal $ZrO_2(ZrO_2(t))$ containing 5.35[wt%] $Y_2O_3$ on the physical properties and electrical conductivity of $Al_2O_3$ were investigated. The addition of $ZrO_2$(m) and $ZrO_2$(t) increased sintered density of $Al_2O_3$. The Vickers hardness also increased as addition of $ZrO_2$(t) increased going through a maximum at 20[wt%] and the hardness of the specimens was found to be dependent on the sintered density. The addition of $ZrO_2$(t) improved the hardness of $Al_2O_3-ZrO_2$ systems and the $ZrO_2$(m) addition showed the better effect on the thermal shock property of $Al_2O_3-ZrO_2$ systems than that of the $ZrO_2$(t) addition. Above 15[wt%] addition of $ZrO_2$(t), the electrical conductivity is gradually increased with increasing applied voltage but not effects by addition of $ZrO_2$(m).

Environmental Effect on Corrosion Behaviour of Zr-2.5Nb Alloy (Zr-2.5Nb 합금의 부식거동에 미치는 부식 매질 효과)

  • Ju, Gi-Nam;Gwon, Sang-Cheol;Kim, Yeong-Seok
    • Korean Journal of Materials Research
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    • v.8 no.1
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    • pp.3-9
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    • 1998
  • 40$0^{\circ}C$ H$_{2}$O, D$_{2}$O및 $O_{2}$분위기에서 Zr-2.5Nb합금의 부식거동을 분석하였다. Martensitic $\alpha$'-Zr상이나 $\alpha$-Zr과 $\beta$-Zr상의 Zr-2.5Nb합금인 경우, 부식분위기에 매우 민감하여, $O_{2}$속에서 가장 큰 부식속도를 보였다. 반면, $\alpha$-Zr나 $\beta$-Zr상의 경우, 부식 매질에 따른 별다른 차이없이 높은 부식저항성을 보였다. 이러한 Zr-2.5Nb 합금의 미세조직 및 부식 매질에 따른 부식거동변화는 Zr-2.5Nb 합금의 음극 지배 부식반응의 관점으로 해석되었으며, 이들 결과를 이용하여 CANDU 형및 RBMK 형 Zr-2.5Nb 압력관의 가동조건 차이를 설명할 수 있었다. Zr-2.5Nb 합금의 모든 조직에서 주로 단사정 ZrO$_{2}$산화물이 형성되었으며, 산화물내 정방정 ZrO$_{2}$비율은 산화물 두께가 증가함에 따라 감소하였다.

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Sintering characteristics of monolithic ZrB$_{2 }$ and ZrB$_{2 }$-ZrC composit (단일상 ZrB$_{2 }$ 및 ZrB$_{2 }$- ZrC 복합체의 소결특성)

  • 김경훈;심광보
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.10 no.2
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    • pp.145-151
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    • 2000
  • The sintering behaviour of monolithic zirconium diboride (ZrB$_{2 }$) and ZrB$_{2 }$-based composite ZrB$_{2 }$-ZrC were studied using a pressureless sintering technique. The specimens were prepared using commercially available ZrB$_{2 }$ and ZrC powder which were pressed and subjected to pressureless sintering. The effects of lanthanum and neodymium used as sintering aids in the sintering processes were investigated. The sintered specimens were characterized using X-ray diffraction analysis and scanning electron microscopy. The ZrB$_{2 }$ specimen prepared using and addition of 1 wt% lanthanum and pressurelessly sintered at $2200^{\circ}C$ showed the maximum relative density of 96%. The ZrB$_{2 }$-ZrC composite specimen without the addition of any sintering aids exhibits the maximum sintered density but contains significantly detectable amount of secondary phase.

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Magnetic and Structural Properties of CoFeZr Alloy Films and Magnetoresistive Properties of Spin Valves Incorporating Amorphous CoFeZr Layer (CoFeZr 합금박막의 미세구조, 자기적 특성 및 비정질 CoFeZr 합금박막을 사용한 스핀밸브의 자기저항 특성에 관한 연구)

  • Ahn, Whang-Gi;Park, Dae-Won;Kim, Ki-Su;Lee, Seong-Rae
    • Journal of the Korean Magnetics Society
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    • v.18 no.6
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    • pp.227-231
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    • 2008
  • Magnetic and structural properties of CoFeZr alloy films as a function of Zr concentration and magnetoresistive properties of spin valves incorporated with amorphous CoFeZr alloy films have been studied. Magnetization and coercivity of CoFeZr alloy films decreased as the Zr content increased. A single amorphous CoFeZr phase was formed when the Zr content is about above 18 at%. Magnetoresistance ratio and exchange coupling field of spin valves with amorphous CoFeZr were reduced slightly as compared with spin valves with CoFe because the resistance of amophous CoFeZr is higher than that of crystalline CoFe. However, the ${\Delta}{\rho}$ of spin valves with amorphous CoFeZr was improved due to reduction of current shunting.

Study of Coercivity Origin in Mechanically Alloyed Co-Zr System

  • Jeong, I.C.;Kwon, H.W.
    • Journal of Magnetics
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    • v.12 no.1
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    • pp.45-48
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    • 2007
  • [ $Co_{100-X}Zr_X$ ] (x=10-40) alloys were prepared by using a mechanical alloying technique. Phase constitution of the crystallised material depended on the annealing temperature. The $Co_{82}Zr_{18}$ alloy crystallised at lower temperature around $550^{\circ}C$ consisted of $Co_{23}Zr_6$, $Co_5Zr$ and fcc-Co phases, while the alloy crystallised at higher temperature around $800^{\circ}C$ consisted of $Co_{23}Zr_6$ and fcc-Co phases. Phase constitution of the crystallised material also depended on the chemical composition of the alloy. The material with lower Zr content less than 10 at% Zr consisted of $Co_{23}Zr_6$ and fcc-Co, and the material with higher Zr-content over 30 at% consisted of $Co_2Zr$ phase. The material containing 15-20 at% Zr consisted of $Co_{23}Zr_6$, $Co_5Zr$ and fcc-Co. Only the material containing $Co_5Zr$ phase exhibited substantial coercivity, and it was confirmed that coercivity in the mechanically alloyed Co-Zr alloy was originated from the $Co_5Zr$ phase.

Combustion Characteristics of HTPB/AP/Zr Propellant (HTPB/AP/Zr 추진제의 연소 특성)

  • Min Byoung-Sun;Hyun Hyung-Soo;Yim Yoo-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • v.y2005m4
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    • pp.61-65
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    • 2005
  • In HTPB/AP propellants, zirconium(Zr) addition to formulation was shown to be less specific impulse than aluminum(Al) by the theoretical calculation because of the lower flame temperature and higher molecular weight of Zr oxide. It was found that the burning rate was faster with the finer size of Zr and the more content of $2{\mu}m$ Zr the faster burning rate is in HTPB/AP/Zr propellants caused by the more conduction energy transfer from Zr flame to the burning surface. Also the burning rate of HTPB/AP/Zr propellant could be reduced by addition of 150nm Al, depending on AP size distribution in formulation with Butacene and $1{\mu}m$ AP.

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Combustion Characteristics of HTPB/AP/Zr Propellant (HTPB/AP/Zr 추진제의 연소 특성)

  • Min Byoung-Sun;Hyun Hyung-Soo;Yim Yoo-Jin
    • Journal of the Korean Society of Propulsion Engineers
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    • v.9 no.2
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    • pp.9-16
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    • 2005
  • Zirconium(Zr) addition to formulation of HTPB/AP propellants, was shown to be less specific impulse than aluminum(Al) by the theoretical calculation because of the lower flame temperature and higher molecular weight of Zr oxide. It was found that the burning rate was faster with the finer size of Zr and the more content of $2{\mu}m$ Zr the faster burning rate is in HTPB/AP/Zr propellants caused by the more conduction energy transfer from Zr flame to the burning surface. Also the burning rate of HTPB/AP/Zr propellant could be reduced by addition of 150nm Al, depending on AP size distribution in formulation with Butacene and $1{\mu}m$ AP.

Microstructure and Elevated Temperature Strength of W-ZrC Composites with Micrometric and Nanosized ZrC Particles (서로 다른 입자크기의 ZrC가 첨가된 W-ZrC 복합체의 미세구조 및 고온강도에 관한 연구)

  • Han, Yoon Soo;Ryu, Sung-Soo
    • Journal of Korean Powder Metallurgy Institute
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    • v.21 no.6
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    • pp.415-421
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    • 2014
  • W-10vol.%ZrC composites reinforced by micrometric and nanosized ZrC particles were prepared by hot-pressing of 25 MPa for 2 h at $1900^{\circ}C$. The effect of ZrC particle size on microstructure and mechanical properties at room temperature and elevated temperatures was investigated by X-ray diffraction analysis, scanning electron microscope and transmission electron microscope observations and the flexural strength test of the W-ZrC composite. Microstructural analysis of the W-ZrC composite revealed that nanosized ZrC particles were homogeneously dispersed in the W matrix inhibiting W grain growth compared to W specimen with micrometric ZrC particle. As a result, its flexural strength was significantly improved. The flexural strength at room temperature for W-ZrC composite using nanosized ZrC particle being 740 MPa increased by around 2 times than that of specimen using micrometric ZrC particle which was 377 MPa. The maximum strength of 935 MPa was tested at $1200^{\circ}C$ on the W composite specimen containing nanosized ZrC particle.

The Effects of Fe and V on the Characteristics of $\beta$to$\alpha$ Transformation for Zr-0.8Sn Alloys (Fe와 V이 Zr-0.8Sn 합금의 $\beta{\rightarrow}\alpha$ 상변태 특성에 미치는 영향)

  • O, Yeong-Min;Kim, Seon-Jin
    • Korean Journal of Materials Research
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    • v.10 no.9
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    • pp.636-641
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    • 2000
  • The effects of Fe and V content on the characteristics of $\beta$ to $\alpha$ phase transformation for Zr-0.8Sn alloys were studied by optical and transmission electron microscopy. With increasing V content, $\beta{\rightarrow}\alpha+\beta$ transformation temperature decreased, thus allowing the width of $\alpha$-lath to be fine air-cooled Zr-0.8Sn-xV alloys. The width of $\alpha$-lath, however, was slightly increased with Fe content. While the $\beta$ to $\alpha$ transformed microstructures of water-quenched Zr-0.8Sn, Zr-0.8Sn-0.1Fe, Zr-0.8Sn-0.2Fe, Zr-0.8Sn-0.4Fe, Zr-0.8Sn-0.1V and Zr-0.8Sn-0.2V were mainly slipped martensite, that of water-quenched Zr-0.8Sn-0.4V was predominantly twinned martensite. The transition of slipped martensite to twinned martensite in Zr-0.8Sn-Xv was thought to be due to the decrease of $M_S$ temperature.

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Effect of ZrO2 Addition on the Microstructure and Electrical Properties of Ni-Mn Oxide NTC Thermistors (Ni-Mn 산화물 NTC 서미스터의 미세구조와 전기적 특성에 미치는 ZrO2첨가의 효과)

  • 박경순;방대영;윤성진;최병현
    • Journal of the Korean Ceramic Society
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    • v.40 no.1
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    • pp.11-17
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    • 2003
  • The effect of$ZrO_2$addition on the microstructure and electrical properties of Ni-Mn oxide NTC thermistors was studied. Major phases present in the sintered bodies of $Ni_{1.0}Mn_{2-x}Zr_xO_4$ were the solid solutions of Ni-Mn-Zr oxides with a cubic spinel structure and the $ZrO_2$ with a tetragonal structure. The $ZrO_2$ was formed by the partial decomposition or incomplete formation of the Ni-Mn-Zr oxides during sintering. With increasing the amount of added $ZrO_2$, the $ZrO_2$ phase increased. The relationship between log resistivity (log p) and the reciprocal of absolute temperature (1/T) of the NTC thermistors prepared was linear, indicative of NTC characteristics. The resistivity, B constant and activation energy of the thermistors increased with increasing $ZrO_2$ content.