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Study on Choice of Diversified R&D Investment Types
Chem Haisheng,Jiang Xueqin,Li Zhuotao,Wu Chendi 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Initially this paper introduces the trends of the diversified R&D investment types as well as the basic characteristics of the R&D investment. Then it proves by empirical test that businesses may have greater effects by adopting diversified investment types than single investment type. At the same time it also indicates that the difficulty of R&D investment has increased. In order to improve the efficiency of diversified investment choice, in this paper we detail factors such as market, enterprise, technology, which influence the types of R&D investment choice, and make a conclusion of each influencing factors as well.
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Xinxue Chen,Chang Li,Siyu Li,Xing Han,Haisheng Jiang,Xiaoyu Zhao 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.12
TC18 titanium alloy, with low density, high strength and corrosion resistance, is a significant material for the main loadbearingcomponents of aircraft landing gear and other aviation structures. However, its corrosion resistance and wear resistanceare insufficient when it is serviced in the extreme corrosion environments such as sea salt spray and hygrothermal,which greatly affects its wide application. It is significant to design and develop high-quality anti-corrosion and wear resistantcoatings for TC18 titanium alloy. High Velocity Oxygen Fuel (HVOF) spraying WC–12Co is an ideal strengthening methodto replace surface chromium plating. Quantitatively evaluating the influence of spraying process parameters on the coatingquality is the key to prepare high-quality coatings. In this study, a numerical model of HVOF spraying WC–12Co wasestablished with JP5000 spray gun. The spray combustion reaction model and discrete phase model were solved to reveal theevolution characteristics of combustion flame flow and particle flight behavior in the spraying process. Based on the responsesurface method, the optimum spraying process parameters were determined, and the WC–12Co coatings were prepared. Onthis basis, the coating was tested by the SEM, XRD, hardness, friction and wear, salt spray corrosion and seawater corrosion. The corrosion resistance and wear resistance of the WC–12Co coating were comprehensively evaluated. The experimentshows that the WC–12Co coating prepared by HVOF spraying has great performance, which can effectively improve theprotective performance of TC18 substrate.
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