scholarly journals Decomposition of silica binder during infiltration of Saffil fiber preform with Mg and Mg-Li melts

2021 ◽  
Vol 52 (04) ◽  
pp. 183-188
Author(s):  
S. KUDELA ◽  
K. IŽDINSKÝ ◽  
S. OSWALD ◽  
P. RANACHOWSKI ◽  
Z. RANACHOWSKI ◽  
...  
Keyword(s):  
Fiber Preform

scholarly journals Preparation of Unidirectional Carbon Fiber Preform for Aluminium Matrix Composites

2011 ◽  
Vol 52 (5) ◽  
pp. 939-942 ◽  
Author(s):  
Moonhee Lee ◽  
Yongbum Choi ◽  
Kenjiro Sugio ◽  
Kazuhiro Matsugi ◽  
Gen Sasaki
Keyword(s):  
Carbon Fiber ◽  
Aluminium Matrix ◽  
Matrix Composites ◽  
Fiber Preform ◽  
Aluminium Matrix Composites

Investigation by Thermoluminescence of the Ionization and Annealing Processes in Irradiated Ge-doped Silica Fiber Preform.

2021 ◽  
pp. 1-1
Author(s):  
A. Guttilla ◽  
C. Campanella ◽  
M. Benabdesselam ◽  
A. Morana ◽  
A. Boukenter ◽  
...  
Keyword(s):  
Silica Fiber ◽  
Fiber Preform

Optical fiber preform diagnostics

1979 ◽  
Vol 18 (1) ◽  
pp. 23 ◽  
Author(s):  
H. M. Presby ◽  
D. Marcuse
Keyword(s):  
Optical Fiber ◽  
Fiber Preform

Compressive Strength of Al2O3 Composites Reinforced with Three-Dimensional Carbon Fiber Preform

2018 ◽  
pp. 507-513
Author(s):  
Chaoyang Fan ◽  
Qingsong Ma ◽  
Kuanhong Zeng
Keyword(s):  
Compressive Strength ◽  
Carbon Fiber ◽  
Three Dimensional ◽  
Fiber Preform

optical fiber preform

2011 ◽  
Keyword(s):  
Optical Fiber ◽  
Fiber Preform

Fabrication of Advanced C/C Composites by a Hybrid Process of CVI/Liquid Precursor Impregnation

1994 ◽  
Vol 365 ◽  
Author(s):  
Masato Ishizaki ◽  
Muneyoshi Shioda ◽  
Kaoru Miyahara ◽  
Tadashi Sasa
Keyword(s):  
Weight Gain ◽  
Temperature Gradient ◽  
Carbon Matrix ◽  
Process Time ◽  
Fiber Preform ◽  
Liquid Precursor ◽  
Matrix Deposition ◽  
C Fiber ◽  
Liquid Impregnation ◽  
Pyrolysis Processes

ABSTRACTFabrication process of advanced C/C composites was developed by combining the CVI and liquid impregnation-pyrolysis processes. Time-controlled temperature-gradient (TC-TG-) CVI process was developed to accelerate the carbon matrix deposition in the C-fiber preform within relatively short process-time. The temperature gradient in the preform was changed according to a controlled program. The present TC-TG-CVI process gave twice as much weight gain as that of the conventional steady TG-CVI process. The CVI process, however, showed limitation to fill up the large pores between the bundles. Liquid impregnation-pyrolysis was, therefore, carried out after the TC- TG-CVI process to improve the infiltration of these pores. Polycarbosilane (PCS) with the yield of about 50 wt% was used as the liquid precursor to form a SiC-rich matrix to improve the oxidation-resistance. SiC matrix was observed in the pores between bundles after pyrolysis of PCS. The weight gain after pyrolysis was found to be nearly saturated after 10 cycles of the impregnation-pyrolysis process.

scholarly journals Instrumentation for Simultaneous Non-Destructive Profiling of Refractive Index and Rare-Earth-Ion Distributions in Optical Fiber Preforms

Instruments ◽  
2018 ◽  
Vol 2 (4) ◽  
pp. 23 ◽  
Author(s):  
Marilena Vivona ◽  
Michalis Zervas
Keyword(s):  
Refractive Index ◽  
Rare Earth ◽  
Optical Fiber ◽  
Communication Systems ◽  
Optical Tomography ◽  
Dopant Distribution ◽  
Fiber Preform ◽  
Rare Earth Ion ◽  
Non Destructive ◽  
Fiber Preforms

We present a non-destructive technique for a combined evaluation of refractive index and active-dopant distribution in the same position along a rare-earth-doped optical fiber preform. The method relies on luminescence measurements, analyzed through an optical tomography technique, to define the active dopant distribution and ray-deflection measurements to calculate the refractive index profile. The concurrent evaluation of both the preform refractive index and the active dopant profiles allows for an accurate establishment of the dopant distribution within the optical core region. This combined information is important for the optimization and development of a range of advanced fibers, used, for example, in a high-power fiber lasers and modern spatial-division-multiplexing optical communication systems. In addition, the non-destructive nature allows the technique to be used to identify the most appropriate preform segment, thus increasing fiber yield and reducing development cycles. We demonstrate the technique on an Yb3+-doped aluminosilicate fiber preform and compare it with independent refractive index and active-dopant measurements. This technique will be useful for quality evaluation and optimization of optical fiber preforms and lends itself to advanced instrumentation.

Modeling of Liquid Metal Infiltration of Porous Fiber Preform During Squeeze Casting

2006 ◽  
Vol 21 (5) ◽  
pp. 495-505 ◽  
Author(s):  
V. Sampath ◽  
N. Ramanan ◽  
R. Palaninathan
Keyword(s):  
Liquid Metal ◽  
Squeeze Casting ◽  
Porous Fiber ◽  
Fiber Preform ◽  
Liquid Metal Infiltration ◽  
Metal Infiltration
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