Effect of SiC on the Oxidation Resistance Performance of C/ZrC Composite Prepared by Polymer Infiltration and Pyrolysis Process

2011 ◽  
Vol 675-677 ◽  
pp. 415-418 ◽  
Author(s):  
Dan Zhao ◽  
Chang Rui Zhang ◽  
Hai Feng Hu ◽  
Yu Di Zhang ◽  
Qi Kun Wang ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Zirconium Carbide ◽  
Pyrolysis Process ◽  
Muffle Furnace ◽  
Carbon Fiber Cloth ◽  
Oxidation Properties ◽  
Resistance Performance ◽  
Polymer Infiltration

Stitched carbon fiber cloth reinforced zirconium carbide composite (C/ZrC) was prepared by polymer infiltration and pyrolysis (PIP) process. C/ZrC-SiC composite was obtained by further introduction of SiC with PIP process in order to improve anti-oxidation property. The results show that 1.9vol% SiC addition improves the mechanical and anti-oxidation properties of C/ZrC composite. The flexural strength of C/ZrC is 247.9MPa, while that of C/ZrC-SiC is 273.1MPa. After oxidation in a muffle furnace at 1200°C for 30 minutes, the mass loss rate was reduced from 30.6% (C/ZrC) to 20.1% (C/ZrC-SiC), and the flexural strength and elastic modulus of C/ZrC were 56.7MPa and 5.7GPa, respectively, while those of C/ZrC-SiC were 122.9MPa and 17.2GPa, respectively.

scholarly journals Evolution of the Mass Loss Rate During Atmospheric and Pressurized Slow Pyrolysis of Wheat Straw in a Bench-Scale Reactor

2018 ◽  
Vol 6 ◽  
Author(s):  
Gianluca Greco ◽  
Joan J. Manyá ◽  
Belén Gonzaléz ◽  
María Videgain
Keyword(s):  
Mass Loss ◽  
Wheat Straw ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Absolute Pressure ◽  
Pyrolysis Process ◽  
Slow Pyrolysis ◽  
Bench Scale ◽  
Pyrolysis Of Biomass ◽  
Scale Reactor

A deep study focused on the significant effect of the absolute pressure on the yield of produced gas during the slow pyrolysis of biomass was carried out. In addition, the evolution of the mass loss rate linked to the pyrolysis process was also analyzed.

Effect of Polypropylene Macro-Fiber on Properties of High-Strength Concrete at Elevated Temperatures

2014 ◽  
Vol 629-630 ◽  
pp. 284-290 ◽  
Author(s):  
Xu Jing Niu ◽  
Qing Xin Zhao ◽  
Ying Nie
Keyword(s):  
Flexural Strength ◽  
Mass Loss ◽  
Water Absorption ◽  
High Strength Concrete ◽  
Loss Rate ◽  
Elevated Temperatures ◽  
Mass Loss Rate ◽  
High Strength ◽  
Hybrid Fibers ◽  
Strength Concrete

After being subjected to different elevated temperatures, ranging between 200 °C and 800 °C, the flexural strength, matrix mass loss rate and water absorption of polypropylene (PP) macro-fiber reinforced high strength concrete (HSC) were investigated. Moreover, the internal damage of concrete was analyzed by the ultrasonic non-destructive testing technology. The results indicate that PP macro-fiber in HSC has an adverse effect on flexural strength, while the synergistic effect of hybrid fibers (PP micro-fiber plus PP macro-fiber) can minimize this effect. Compared with PP micro-fiber, PP macro-fiber is more effective in increasing the matrix mass loss rate and water absorption of HSC. However, if the dosage of PP macro-fiber is too high, the pressure relief channels formed by fibers melt will be too coarse, and the total porosity of HSC will be increased significantly. Finally, a mathematical model relating the damage degree to temperature was established based on the non-linear fitting of the experimental data.

scholarly journals SN 2009ip: CONSTRAINTS ON THE PROGENITOR MASS-LOSS RATE

2013 ◽  
Vol 768 (1) ◽  
pp. 47 ◽  
Author(s):  
E. O. Ofek ◽  
L. Lin ◽  
C. Kouveliotou ◽  
G. Younes ◽  
E. Göğüş ◽  
...  
Keyword(s):  
Mass Loss ◽  
Loss Rate ◽  
Mass Loss Rate

scholarly journals AGB Winds with Gas-Dust Drift in Stellar Evolution Codes

Universe ◽  
2021 ◽  
Vol 7 (5) ◽  
pp. 113
Author(s):  
Lars Mattsson ◽  
Christer Sandin
Keyword(s):  
Stellar Evolution ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Carbon Star ◽  
Intermediate Mass ◽  
Future Directions ◽  
Physical Description ◽  
Intermediate Mass Stars ◽  
Dust Component ◽  
Improved Model

A significant fraction of new metals produced in stars enter the interstellar medium in the form of dust grains. Including dust and wind formation in stellar evolution models of late-stage low- and intermediate-mass stars provides a way to quantify their contribution to the cosmic dust component. In doing so, a correct physical description of dust formation is of course required, but also a reliable prescription for the mass-loss rate. Here, we present an improved model of dust-driven winds to be used in stellar evolution codes and insights from recent detailed numerical simulations of carbon-star winds including drift (decoupling of dust and gas). We also discuss future directions for further improvement.

Preparation and characterization of ZrB 2 and TaC containing C f /SiC composites via Polymer-Infiltration-Pyrolysis process

2017 ◽  
Vol 37 (5) ◽  
pp. 1955-1960 ◽  
Author(s):  
Franziska Uhlmann ◽  
Christian Wilhelmi ◽  
Stephan Schmidt-Wimmer ◽  
Steffen Beyer ◽  
Claudio Badini ◽  
...  
Keyword(s):  
Pyrolysis Process ◽  
Sic Composites ◽  
Polymer Infiltration

Online-Joining of C/SiC-C/SiC via Slurry Reaction and Precursor Infiltration and Pyrolysis Process with C/SiC Pins

2012 ◽  
Vol 531-532 ◽  
pp. 135-140 ◽  
Author(s):  
Yu Di Zhang ◽  
Hai Feng Hu ◽  
Chang Rui Zhang ◽  
Guang De Li
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Fracture Mode ◽  
Pyrolysis Process ◽  
Strong Bond ◽  
Sic Composites ◽  
Maximum Shear Strength ◽  
Application Prospects ◽  
Complex Components

C/SiC composites have widely application prospects in the field of aeronautic and aerospace for their excellent properties. The joining of C/SiC composites is a key to fabricate large and complex components. In this paper, 1D C/SiC pins were prepared by precursor infiltration and pyrolysis (PIP) process and used to join C/SiC composites by Slurry react (SR) and PIP process. The shear strength of the C/SiC pins with different carbon fiber volumes was investigated with the maximum shear strength as high as 339.46MPa. Influences of C/SiC pins on the joining properties of C/SiC composites were studied. The shear strength and flexural strength of C/SiC-C/SiC joining are improved from 9.17MPa and 30.41MPa without pins to 20.06MPa and 75.03MPa with one C/SiC pin (diameter 2mm), respectively. The reliability of C/SiC-C/SiC joining is also improved with C/SiC pins in that the fracture mode changes from catastrophic without pins to non-catastrophic. The SEM photos show a strong bond between joining layer and C/SiC composites without obvious interface.

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