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Research on Powder Metallurgy Technology in Fusion Materials in China
Ge Chang-Chun,Zhou Zhang-Jian,Du Juan,Song Shu-Xiang 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In the viewpoint of engineering, materials problem is a key problem, which determines whether the exploitation of fusion energy will be success. The most important class of fusion materials is plasma-facing materials (PFM). W, as high Z high melting-point metal is one of the most important candidate materials due to its high plasma erosion resistance. Improving the ductility of W and W based alloy, lowering its ductile-brittleness transition temperature for meeting the requirements of fusion application is an important task. In this paper, severalpowder meatllurgy methods of fabricating W and W based materials are being investigated.
Chao Ge,Chang-chun Hua,Xin-Ping Guan 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.4
This paper concerns with the problem of asymptotic stability for neutral systems with time-varying delays. With the introduction of delay-decomposition approach, some new delay-dependent stability criteria are established and formulated in the form of linear matrix inequalities. Both constant time delays and time-varying delays have been taken into account. Numerical examples are given to demonstrate the effectiveness and less conservativeness of the proposed methods.
Powder Metallurgy of Tungsten Alloy
Ke Zhang,Chun Ge-Chang 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Preparation of tungsten powder, sorts of tungsten alloys and their application in economy are made a summary in this paper.
Sintering of Powder Prepared by Self-Propagating High-Temperature Synthesis (SHS)
Bai Ling,Zhao Xing-Yu,Ge Chang-Chun 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Preparation processing of sintered silicon nitride ceramics was emphatically investigated with Self-Propagating High-Temperature Synthesis (SHS) of silicon nitride prepared by ourselves as raw material. The results indicate that good sinter ability can be obtained with cheaply SHS of silicon nitride preparing silicon nitride materials. The cost of silicon nitride materials will be lowered.
The Research of Fiscal Expenditure Policy in Chinas Transitional Period
Han Yong Shin(신한용),Gao Chang Chun,Liu Wen Ge 한국무역학회 2003 한국무역학회 학술대회 Vol.2003 No.5
Fiscal expenditure policy is one of the important parts of macro-economic policy. The active effect of fiscal policy is centralized on the continuously growing of private investment as a result of the increment of fiscal expenditure, which would greatly expedite the growth of national economy. During Chinas transitional period, it is very important to properly manage the interactive relationship between the increment of fiscal expenditure and the growth of private investment. The purpose is to increase private investment by enlarging fiscal expenditure while eliminating anticipatory crowding-out effect caused by the increment of fiscal expenditure.
Microstructure and Bonding Strength of Tungsten Coating Deposited on Copper by Plasma Spraying
Song Shu-Xiang,Zhou Zhang-Jian,Du Juan,Zhong Zhi-Hong,Ge Chang-Chun 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Tungsten coatings with different interlayers onto the oxygen-free copper substrates were fabricated by atmosphere plasma spraying. The effects of different interlayers of NiCrAl, NiAl and W/Cu on bonding strength were studied. SEM, EDS and XRD were used to investigate the photographs and compositions of these coatings. The tungsten coatings with different initial particle sizes resulted in different microstructures. Oxidation was not detected in the tungsten coating, but in the interlayer, it was found by both XRD and EDS. The tungsten coating deposited directly onto the copper substrate presented higher bonding strength than those with different interlayers.
Fabrication of Pure Refractory Metals by Resistance Sintering under Ultra High Pressure
Zhou Zhang-Jian,Du Juan,Song Shu-Xiang,Ge Chang-Chun 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Refractory materials, such as W and Mo, are very useful elements for use in high-temperature applications. But it is not easy to fabricat pure W and Mo with very high density and retaining very fine grain size because of their high melting point. In this paper, a newly developed method named as resistance sintering under ultra high pressure was use to fabricate pure fine-grained W and Mo. The microstructure was analysis by SEM. The sintering mechanism is primary analyzed. Basic physical property of these sintered pure W and Mo, such as hardness, bend strength, are tested.