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Superplastic Titanium Tanks for Propulsion System of Satellites (2007)

Sato, Eiichi ; Sawai, S. ; Uesugi, K. ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Materials science forum Vol. 551-552 (July 2007), p. 43-48

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ISSN: 1662-9752

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Institute of Space and Astronautical Science (ISAS/JAXA) in collaboration withMitsubishi Heavy Industries (MHI) has developed fuel and gas tanks for reaction control system andorbital control system of satellites; A tank is fabricated through welding of two thin, hemi-spherical orconical parts, which are fabricated by superplastic blow forming. Mass-productivity is not animportant factor but the forming precision and flexibiliry in the process are important for thisapplication. ISAS and MHI, therefore, developed a new blow-forming technique, which has highflexibility in terms of tank size because it requires a furnace but not a hot-press machine. Some typicalpropulsion tanks fabricated through this process are presented

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.43.pdf

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Evaluation of Hemispherical Total Emissivity for Thermal Radiation Calorimetry (2000)

Tanaka, H. ; Sawai, S. ; Morimoto, K. ; [et al.]

Springer

International journal of thermophysics 21 (2000), S. 927-940

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ISSN: 1572-9567

Keywords: calorimetry ; emittance ; fused silica ; hemispherical total emissivity ; refractive index ; spectral emissivity ; thermal conductivity ; virtual mode ; Vycor glass

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract An attempt to derive the hemispherical total emissivity from the normal emission spectrum is proposed for Vycor and fused silica glasses. The normal emission spectrum from a clear surface has been measured at steady state in the temperature range from 400 to 750 K. The sample is heated on one metal-backed face by thermal radiation from a heater. Temperatures inside the sample were monitored by thermocouples at two points near the surfaces. Evaluation of the hemispherical total emissivity from the normal emission spectrum is determined by means of Kramers–Krönig analysis and virtual mode equations. Assuming a linear temperature distribution within the sample, the thermal conductivities of silicate glasses were obtained at elevated temperatures. The results are comparable with those obtained by previous investigators. The effect of radiation heat transfer in a sample is also discussed.