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Laser Induced Damage in CVD Diamond Films

Chinese Journal of Lasers 1998年第1期 74-79页

作者： QIU Hong FAN Zhengxiu(Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,P.O.Box 800211, Shanghai 201800, China)received Apr. 15 1997 revised manuscript received july 19 1997

ＬａｓｅｒＩｎｄｕｃｅｄＤａｍａｇｅｉｎＣＶＤＤｉａｍｏｎｄＦｉｌｍｓＱＩＵＨｏｎｇＦＡＮＺｈｅｎｇｘｉｕ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅ... 详细信息

ＬａｓｅｒＩｎｄｕｃｅｄＤａｍａｇｅｉｎＣＶＤＤｉａｍｏｎｄＦｉｌｍｓＱＩＵＨｏｎｇＦＡＮＺｈｅｎｇｘｉｕ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ，Ｐ．Ｏ．...

关键词： CVD diamond film XRD LIDT absorption

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Processing TiAl-Based Alloy by Elemental Powder Metallurgy

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Journal of Materials Science & Technology 2000年第6期16卷 605-610页

作者： Yong LIU, Baiyun HUANG, Yuehui HE and Kechao ZHOU (National Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, China) [manuscript received july 31, 1999, in revised form November 19, 1999] Natl. Key Lab. for Powder Metallurgy Central South Univ. of Technol. Changsha 410083 China

TiAI-based alloys with various compositions (including Ti-48Al, Ti-47Al-2Cr-2Nb, Ti-47Al-2Cr-2Nb-0.2B and Ti-47Al-3Cr, in mole fraction) had been prepared by elemental powder metallurgy (EPM). The results have shown that the density of the prepared Ti-48AI alloy increases with increasing hot pressing temperature up to 1300℃. The Ti-48AI alloy microstructure mainly consisted of island-like Ti3Al phase and TiAl matrix at hot pressing temperature below 1300℃, however, coarse α2/γ lamellar colonies and γ grains appeared at 1400℃. It has also indicated that the additions of elemental Cr and B can refine the alloy microstructure. The main microstructural inhomogeneity in EPM TiAI-based alloys was the island-like α2 phase or the aggregate of α2/γ lamellar colony, and such island-like structure will be inherited during subsequent heat treatment in (α＋γ) field. Only after heat treatment in a field would this structure be eliminated. The mechanical properties of EPM TiAl-based alloys with various compositions were tested, and the effect of alloy elements on the mechanical properties was closely related to that of alloy elements on the alloy microstructures. Based on the above results, TiAI-based alloy exhaust valves were fabricated by elemental powder metallurgy and diffusion joining. The automobile engine test had demonstrated that the performance of the manufactured valves was very promising for engine service.

关键词： TiAl Processing TiAl-Based Alloy by Elemental Powder Metallurgy

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Experimental Investigation on Temperature Characteristic and Temperature Control of Fiber Bragg Gratings

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Chinese Journal of Lasers 1998年第6期 31-35页

作者： QIN Yuwen ZHAO Yucheng CHEN Genxiang JIAN Shuisheng (Institute of Lightwave Technology,Northern Jiaotong University,Beijing 100044,China) received Nov. 16, 1997 revised manuscript received july 13, 1998

１ＩｎｔｒｏｄｕｃｔｉｏｎＦｉｂｅｒＢｒａｇｇｇｒａｔｉｎｇｓ（ＦＢＧｓ）ｈａｖｅａｔｒａｃｔｅｄｍｕｃｈａｔｅｎｔｉｏｎｉｎｒｅｃｅｎｔｙｅａｒｓ［１～３］ｂｅｃａｕｓｅｏｆｔｈｅｉｒａｃｔｕａｌａｎｄｐｏｔｅｎｔ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＦｉｂｅｒＢｒａｇｇｇｒａｔｉｎｇｓ（ＦＢＧｓ）ｈａｖｅａｔｒａｃｔｅｄｍｕｃｈａｔｅｎｔｉｏｎｉｎｒｅｃｅｎｔｙｅａｒｓ［１～３］ｂｅｃａｕｓｅｏｆｔｈｅｉｒａｃｔｕａｌａｎｄｐｏｔｅｎｔｉａｌｉｍｐｏｒｔａｎｔａｐｐｌｉ...

关键词： fiber Bragg grating temperature characteristic temperature control tuning

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