scholarly journals Fabrication of SiC Composites with Synergistic Toughening of Carbon Whisker andIn Situ3C-SiC Nanowire

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Zhang Yunlong ◽  
Zhang Yumin ◽  
Hu Ming ◽  
Li Jinping
Keyword(s):  
Mechanical Properties ◽  
Interplanar Spacing ◽  
Hot Press ◽  
Treatment Technology ◽  
Preferential Growth ◽  
Sic Nanowires ◽  
Growth Plane ◽  
Sic Composites ◽  
Vapor Liquid Solid Growth

The SiC composites with synergistic toughening of carbon whisker andin situ3C-SiC nanowire have been fabricated by hot press sinter technology and annealed treatment technology. Effect of annealed time on the morphology of SiC nanowires and mechanical properties of theCw/SiC composites was surveyed in detail. The appropriate annealed time improved mechanical properties of theCw/SiC composites. The synergistic effect of carbon whisker and SiC nanowire can improve the fracture toughness forCw/SiC composites. The vapor-liquid-solid growth (VLS) mechanism was proposed. TEM photo showed that 3C-SiC nanowire can be obtained with preferential growth plane ({111}), which corresponded to interplanar spacing about 0.25 nm.

Effect of in situ grown SiC nanowires on microstructure and mechanical properties of C/SiC composites

2014 ◽  
Vol 40 (4) ◽  
pp. 5191-5195 ◽  
Author(s):  
Bingbing Pei ◽  
Yunzhou Zhu ◽  
Ming Yuan ◽  
Zhengren Huang ◽  
Yinsheng Li
Keyword(s):  
Mechanical Properties ◽  
Sic Nanowires ◽  
Microstructure And Mechanical Properties ◽  
Sic Composites

Effect of La2O3 Content on Mechanical Properties and Toughened Mechanics of SiC Nanowires Toughened Cw/SiC Composites

2010 ◽  
Vol 650 ◽  
pp. 119-125 ◽  
Author(s):  
Yun Long Zhang ◽  
Yu Min Zhang ◽  
Jie Cai Han
Keyword(s):  
Mechanical Properties ◽  
Growth Rate ◽  
Room Temperature ◽  
Annealing Treatment ◽  
Longitudinal Direction ◽  
Sic Nanowires ◽  
Improve Fracture Toughness ◽  
Sic Composites ◽  
Grain Bridging

In this paper, micrometers long and 20–100nm diameter SiC nanowires had been synthesized in the Cw/SiC composites by annealing treatment. The present work demonstrated that it is possible to fabricate in-situ SiC nanowires toughening Cw/SiC composites. La2O3 had a significant effect on the morphology and distribution of the SiC nanowires in the Cw/SiC composites. The excess lanthanum resulted in the growth of SiC nanowires with an increasing growth rate in the longitudinal direction and a decreasing growth rate in radial direction. The addition of La2O3 would improve the mechanical properties in the room-temperature. The vapor–liquid-solid growth mechanism of the SiC nanowires along <111> direction was proposed. The combination of grain bridging, crack deflection, whisker debonding and SiC nanowires can improve fracture toughness.

scholarly journals Effect of Sintering Temperature on Microstructure and Mechanical Properties of Hot-Pressed Fe/FeAl2O4 Composite

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 422
Author(s):  
Kuai Zhang ◽  
Yungang Li ◽  
Hongyan Yan ◽  
Chuang Wang ◽  
Hui Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Hot Press ◽  
Microstructure And Mechanical Properties ◽  
Powder Particles ◽  
Hot Press Sintering ◽  
Sintering Method

An Fe/FeAl2O4 composite was prepared with Fe-Fe2O3-Al2O3 powder by a hot press sintering method. The mass ratio was 6:1:2, sintering pressure was 30 MPa, and holding time was 120 min. The raw materials for the powder particles were respectively 1 µm (Fe), 0.5 µm (Fe2O3), and 1 µm (Al2O3) in diameter. The effect of sintering temperature on the microstructure and mechanical properties of Fe/FeAl2O4 composite was studied. The results showed that Fe/FeAl2O4 composite was formed by in situ reaction at 1300 °C–1500 °C. With the increased sintering temperature, the microstructure and mechanical properties of the Fe/FeAl2O4 composite showed a change law that initially became better and then became worse. The best microstructure and optimal mechanical properties were obtained at 1400 °C. At this temperature, the grain size of Fe and FeAl2O4 phases in Fe/FeAl2O4 composite was uniform, the relative density was 96.7%, and the Vickers hardness and bending strength were 1.88 GPa and 280.0 MPa, respectively. The wettability between Fe and FeAl2O4 was enhanced with increased sintering temperature. And then the densification process was accelerated. Finally, the microstructure and mechanical properties of the Fe/FeAl2O4 composite were improved.

scholarly journals Fabrication and mechanical properties of Al2O3/TiAl in situ composites doped with Nb2O5

2015 ◽  
Vol 47 (3) ◽  
pp. 311-317 ◽  
Author(s):  
F. Wang ◽  
N. Fan ◽  
J. Zhu ◽  
H. Jiang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Hot Press ◽  
Dispersion Method ◽  
Powder Mixtures ◽  
In Situ Composites ◽  
Microstructures And Mechanical Properties

Al2O3/TiAl composites were successfully fabricated from powder mixtures of Ti, Al, TiO2, Cr2O3 and Nb2O5 by a hot-press-assisted exothermic dispersion method. The effect of the Cr2O3 and Nb2O5 addition on the microstructures and mechanical properties of Al2O3/TiAl composites was characterized. The results showed that the specimens are mainly composed of TiAl, Ti3Al, Al2O3, NbAl3 and Cr2Al. The Vicker-hardness and density of Al2O3/TiAl composites increase gradually with the increase of Nb2O5 content. When the Nb2O5 content was 6.54 wt %, the flexural strength and fracture toughness of the composites have a maximum values of 789.79 MPa and 9.69 MPa?m1/2, respectively. The improvement of mechanical properties is discussed in detail.

Mechanical properties of B4C–SiC composites fabricated by hot-press sintering

2020 ◽  
Vol 46 (7) ◽  
pp. 9575-9581 ◽  
Author(s):  
Sung Min So ◽  
Woo Hyuk Choi ◽  
Kyoung Hun Kim ◽  
Joo Seok Park ◽  
Min Suk Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hot Press ◽  
Sic Composites ◽  
Hot Press Sintering

Microstructure, mechanical properties and oxidation resistance of SiCf/SiC composites incorporated with boron nitride nanotubes

RSC Advances ◽  
2016 ◽  
Vol 6 (86) ◽  
pp. 83482-83492 ◽  
Author(s):  
Guangxiang Zhu ◽  
Shaoming Dong ◽  
Dewei Ni ◽  
Chengying Xu ◽  
Dengke Wang
Keyword(s):  
Mechanical Properties ◽  
Chemical Vapor ◽  
Boron Nitride Nanotubes ◽  
Chemical Vapor Infiltration ◽  
Raw Material ◽  
Boron Powder ◽  
Hierarchical Composites ◽  
Sic Composites ◽  
Polymer Impregnation

SiCf/BNNTs–SiC hierarchical composites were fabricated via firstly in situ growth of BNNTs on SiC fibers using boron powder as a raw material and then matrix densification by chemical vapor infiltration and polymer impregnation/pyrolysis methods.

Sign in / Sign up

Export Citation Format

Share Document