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The Effect of Deformation Stress-strain and Temperature on the Degradation of Bi-2223/Ag Tapes
Ha Hong-Soo,Kim Sang-Cheol,Ha Dong-Woo,Oh Sang-Soo,Joo Jin-Ho 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In order to investigate 95% retained critical current of Bi-2223/Ag tapes under various stress-strain conditions, load cell attached tension and bending apparatus was used. The critical current of stress-strained tape was degraded below 95% retained critical current when tension and bending was simultaneously applied together. But only one of this tension or bending did not degrade the tape below 95% retained critical current. Deformation temperature was important to maintain the 95% retained Ic of Bi-2223/Ag tapes after bending or tension deformation because mechanical strength of tapes can be changed drastically between room temperature and 77 K.
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Development of Dental Scaler Tip Mold with Powder Injection Molding Process
Hwang C.J.,Ko Y.B.,Park H.P.,Chung S.T.,Rhee B.O. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
With the capability of net shaping for complex 3D geometry, powder injection molding (PIM) is widely used for automotive parts, electronics and medical industry. In this study, an ultrasonic dental scaler tip produced by machining process was redesigned for the PIM process. An injection mold was designed and machined to produce the dental scaler tip by the PIM process.
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Plastic Behaviour of Green Powder Metallurgical Compacts
Prado J. M.,Riera M. D. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The results of monotonic and cyclic uniaxial compression tests, in which the deviatoric component of the stress is predominant, carried out on green and recrystallized iron compacts with different levels of density are presented and discussed in order to analyse the macro and micro-mechanisms governing the mechanical behaviour of non-sintered PM materials. The plastic deformation of the particles, especially at the contact areas between neighbouring grains, produces an internal friction responsible for the main features observed in the behaviour of green metallic compacts. These results show important discrepancies with the plasticity models, Cam-Clay and Drucker-Prager Cap.
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Xiong Wei-hao,Zheng Li-yun,Yan Xian-mei 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Sintered Ti(C,N)-based cermets were treated with hot isostatic pressing (HIP) at different nitrogen pressures. The tribological properties of the treated cermets have been evaluated. The results show that a hard near-surface area rich in TiN formed after HIP treatment. The cermets treated at higher pressure had a relatively lower friction coefficient and specific wear rate. In all cases the microhardness of treated cermets is higher than that without HIP natridation. The wear mechanisms of cermets were hard particle flaking-off and ploughing. It was also found that the HIP natridation is well-suited for improving the tribological properties of cermets.
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