http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
반도성 BaTi0₃세라믹스의 미세구조및 PTCR 특성에 미치는 Si0₂첨가효과
오권오(K.O.Oh),정연호(Y.H.Jeung),강구현(G.H.Kang),양성철(S.C.Yang) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Generally, it needs high sintering temperature more than 1350℃ to make semiconductive BaTiO₃ ceramics. Also in solid state reaction method now used as the additive is solid phase and small quantity, homogenious mixture is difficult in mixing. Because of it, heterogenious of liquid phase occurs. Mixing of impurities in manufacturing affect characteristics of PTCR. For this reason, the study is regarded as more important study these days; which can improve renewal value of products by distributing the small additive, and can reduce the manufacturing costs by lowering the sintering temperature, and used Automobil industry PTCR is requierd low resistivity, various electrical properties. Accordingly this study suggests the particulars to remove the above problem. We were studied as a function of submicron SiO₂ contents. When SiO₂ was added as a second phase(BaTi₃O_7, BaTiSiOs) was observed in grainboundary. C samples showed superior PTCR effects.<br/>
30wt%Ag-36wt%Cu-32wt%Zn-2wt%Sn 브레이징 합금의 미세조직과 기계적 물성에 미치는 Ni 첨가의 영향
정재원,이상율,양성철 한국 항공대학교 항공산업기술연구소 2000 航空宇宙産業技術硏究所 硏究誌 Vol.10 No.-
본 연구의 목적은 Cd-free합금의 개발로, Ag-Cu-Zn-Sn기 브레이징 합금에 Ni을 첨가함에 따라 브레이징 합금에 조직적인 변화가 나타났다. Ag-Cu-Zn 기 브레이징 합금에 Cd 대신에 Ni첨가의 효과와 접합된 접합부의 미세조직은 EDS가 장착된 SEM과 XRD, DSC 등을 사용하여 분석하였다. Ni이 1∼2wt% 첨가된 브레이징 합금에서 Ni 함량의 증가에 따라 미소경도와 인장강도가 증가하였고, 가장 높은 인장강도는 Ni이 2wt% 첨가된 3076-2 합금으로 약 820 MPa 이었다. 브레이징은 850℃에서 15분간 대기중에서 노 브레이징 방법을 사용하여 실시하였고, 접합강도는 파괴 전단하중에 의해 측정하였다. 가장 높은 전단강도는 Ni이 2wt%첨가된 3076-2 합금에서 얻었으며, 258 MPa 이었다. The purpose of this study is to develope a Cd-free brazing filler metal. The microstructure of Ag-Cu-Zn-Sn based brazing alloy was affected by Ni addition. Effects of Ni addition replacing Cd in Ag-Cu-Zn based brazing alloy and microscope(SEM) equipped with energy-dispersive spectrometer(EDS). X-ray diffractometer(XRD) and differential scanning calorimetry(DSC). As Ni is added 1~2wt% in the brazing alloy, microhardness and tensile strength of brazing alloy increase with Ni contents. the maximum average tensile strength of 820 MPa has been obtained from the 3076-2 alloy which were added 2wt% Ni. Brazing is performed on the STS304/STS304 by furnace-brazing at 850℃ for 15min. Joint shear strength was determined by fracture shear loading and the brazed with 3076-2 alloy(2wt% Ni added) showed the highest shear strength of about 258 MPa.