Results 81 to 90 of about 375,121 (181)

Viscosity of Compressed Liquid 1,1,1-Trifluoroethane (HFC-143a) and Pentafluoroethane (HFC-125)

open access: yes, 2006
The viscosity of compressed liquid 1,1,1-trifluoroethane (HFC-143a) and pentafluoroethane (HFC-125) has been measured with a vibrating-wire viscometer at five temperatures between (254 and 293) K.
Fareleira, João M. N. A.   +3 more
core   +1 more source

Polymer precursor-derived HfC-SiC ultrahigh-temperature ceramic nanocomposites

open access: yes, 2018
Due to poor mechanical properties and antioxidation properties, etc of single phase ultrahigh-temperature ceramics (UHTCs), the second phase such as SiC was usually introduced for improving those properties.
Cai, Tao   +4 more
core  

Pressure - Temperature phase diagrams of clathrate hydrates of HFC-134a, HFC-152a and HFC-32

open access: yes, 2010
CD-Rom ISBN: 978-081691065-6International audienceIn this communication, we report dissociation pressures for clathrate hydrates of C2H2F4 (1,1,1,2-tetrafluoroethane or HFC-134a or R-134a), C2H4F2 (1,1-difluoroethane or HFC-152a or R-152a) and CH2F2 ...
Richon, Dominique, Mohammadi, Amir H.
core   +1 more source

HfB_2-HfC-SiC改性C/C复合材料的超高温烧蚀性能研究

open access: yes, 2016
目的制备HfB_2-HfC-SiC复相陶瓷改性C/C复合材料,并探究该材料的超高温烧蚀性能。方法采用化学气相渗透结合前驱体浸渍热解工艺制备HfC-SiC复相陶瓷改性C/C复合材料(C/C-HfC-SiC)和HfB_2-HfC-SiC复相陶瓷改性C/C复合材料(C/C-HfB_2-HfC-SiC),采用大气等离子烧蚀实验研究材料的超高温烧蚀性能。结果C/C-HfC-SiC和C/C-HfB_2-HfC-SiC复合材料2200℃线烧蚀率分别为1.54×10~(-3),1.38×10~
张伟刚, 魏玺, 李捷文
core  

Coating of HfC on Tungsten Powder by Fluidized Bed CVD

open access: yesJournal of the Japan Institute of Metals, 1995
openaire   +2 more sources

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