MoSi2 Composites for High Temperature Structural Applications

Uzunonat, Yagiz; Uzgur, Sinem Cevik; Diltemiz, S. Fehmi; Kushan, Melih Cemal; Ölmez, Rabia

doi:10.4028/www.scientific.net/AMR.214.103

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Home Advanced Materials Research Advances in Key Engineering MaterialsMoSi2 Composites for High Temperature Structural...

MoSi₂ Composites for High Temperature Structural Applications

Abstract:

In this paper, the basic limitations of superalloys’ in high temperature performances will be explained and then after giving the important properties of MoSi2, some interesting composites of this material will be discussed as a candidate structural material for gas turbine engines.

Info:

Periodical:

Advanced Materials Research (Volume 214)

Main Theme:

Advances in Key Engineering Materials

Edited by:

Zeng Zhu

Pages:

103-107

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.214.103

Citation:

Y. Uzunonat et al., "MoSi₂ Composites for High Temperature Structural Applications", Advanced Materials Research, Vol. 214, pp. 103-107, 2011

Online since:

February 2011

Authors:

Yagiz Uzunonat, Sinem Cevik Uzgur, S. Fehmi Diltemiz, Melih Cemal Kushan, Rabia Ölmez

Keywords:

Gas Turbine Elements, Molybdenum Disilicide, Structural Composites

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References

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[8] J.J. Petrovic: High Temperature Structural Silicides, Ceramic Engineering and Science Proceedings, 18, 3-17. (1997).

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DOI: https://doi.org/10.1016/0956-716x(95)00093-b

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DOI: https://doi.org/10.1557/proc-194-123

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Paper TitlePages

Fracture Behaviour of Brittle (Glass) Matrix Composites

Authors: Ivo Dlouhý, Zdeněk Chlup, Aldo Roberto Boccaccini

Abstract: A number of examples exist that indicate the potential for increasing the toughness of brittle matrices by dispersing different reinforcements. For further development of these advanced materials the actual material response during mechanical loading under presence of flaws appears to be important. Theoretical and experimental knowledge acquired on different kinds of brittle matrix composites is summarised in the paper. These include glass matrix composites with metallic particles, alumina platelets, continuous SiC (Nicalon®) fibres, and both chopped fibres and ZrO2particles (hybrid composites). The composites were tested in as-received state but also after different forms of thermomechanical loading, e.g. thermal shock, thermal cycling in air, which were investigated according to the envisaged composites application. Chevron notch technique was mainly used for fracture toughness evaluation. Microstructural damage is explained based on identified fracture micromechanisms.

115

Preparation and Mechanical Properties of C/C-SiC Composites

Authors: Dong Mei Zhu, Hong Na Du, Fa Luo, Wan Cheng Zhou

Abstract: Porous C/C composite with certain porosity prepared by Chemical vapor infiltration (CVI) was chosen as the preforms to develop the C/C-SiC composites through precursor infiltration and pyrolysis(PIP), using PCS (polycarbosilane) as the precursor and divinylbenzene as solvent and cross-linking reagent for PCS. The effect of the infiltration solution with different PCS/DVB ratio on the final density, microstructure, and mechanical properties of composites was investigated and the proper PCS/DVB ratio to prepare the C/C-SiC composites was suggested. The experimental results showed that the final densities and the mechanical properties of the composites were close related to the PCS/DVB ratio. Higher PCS/DVB ratio resulted in higher final density and better mechanical properties, but not the highest PCS/DVB ratio could get the best mechanical properties. The main reason is that too high PCS/DVB ratio will make the infiltration process become difficult and lead to the formation of lots of pores in the final composite, at last lowers the mechanical properties. It is believed that the 50% PCS content is proper to prepare the C/C-SiC composites. The composite from 50% PCS infiltration solution could get the final density of1.696g/cm3, the flexural strength of 171Mpa, and shearing strength of 21.6Mpa, which are the best mechanical results among the obtained materials.

1501

Investigation of Mechanical Property and Thermal Shock Behavior of Machinable B₄C/BN Ceramics Composites

Authors: Tao Jiang, Hai Yun Jin, Zhi Hao Jin, Jian Feng Yang, Guan Jun Qiao

Abstract: The machinable B4C/BN ceramics composites were fabricated by hot-pressing sintering process at 1850oC for 1h under the pressure of 30MPa. The mechanical property, thermal shock behavior and machinability of the B4C/BN ceramics composites were investigated in this article. The experimental results showed that the fracture strength and fracture toughness of the B4C/BN nanocomposites were significantly improved in comparison with the B4C/BN microcomposites. The Vickers hardness of the B4C/BN nanocomposites and B4C/BN microcomposites decreased gradually with the increasing content of h-BN, while the machinability of the B4C/BN nanocomposites and B4C/BN microcomposites were significantly improved. The B4C/BN ceramics composites with the h-BN content more than 20wt% exhibited excellent machinability. The thermal shock resistances of the B4C/BN ceramics composites were better than that of the B4C monolith, and the thermal shock resistance of the B4C/BN nanocomposites was much better than that of the B4C/BN microcomposites. The thermal shock temperature difference (-Tc) of B4C monolith was about 300oC, while the -Tc of the B4C/BN microcomposites was about 500oC, the -Tc of the B4C/BN nanocomposites was about 600oC.

Thermal Expansion Behavior and Characteristic of SiCp/Al Composites

Authors: Xian Liang Zhou, Duo Sheng Li, Ai Hua Zou, Xiao Zhen Hua, Zhi Guo Ye, Qing Jun Chen

Abstract: SiCp/Al composites were fabricated by ceramic mold freedom infiltration and pressureless infiltration, respectively. The microstructure and phases are analyzed by metallurgical microscope and coefficient of thermal expansion of SiCp/Al composites were tested by thermal dilatometer. The results show that SiCp/Al composites are compact and uniform. SiC particles were dispersed uniformly in Al matrix, and SiCp segregation was not found in composites. Under a certain SiCp size range, space between SiCp decreases with decreasing of SiCp size, and CTE of SiCp/Al composites also decreases with decreasing of particles size. Compared with CTE of composite with pure aluminum as matrix, CTE of composite with ZL101 as matrix is less. Under the annealing process, CTE of SiCp/Al composites with ZL101 as matrix is less than that with the solution and aging, which indicated that its dimensional stability of resisting to temperature fluctuation is better, and thermal expansion behavior and characteristic of SiCp/Al composites are also better.

658

In Situ Fabrication and Microstucture of ZrB₂ Particles Reinforced Aluminum Matrix Composites

Authors: Zhu Rui, Yu Tao Zhao, Song Li Zhang, Zhi Hong Jia

Abstract: Abstract：Aluminum matrx composites reinforced by in situ ZrB2 particles are fabricated from A356-AlB-K2ZrF6 system via in-situ melt reaction method, and the morphologies, sizes and distributions of the in situ particles as well as the microstructures, mechanical mechanisms of the composites are investigated by XRD,SEM,TEM and tensile tests. The results indicate that the morphologies of the in situ particles are mainly with ball-shape, the sizes are in nanometer scale and the distributions in the matrix are uniform. The interfaces between the in situ particles and the aluminum matrix are net and no interfacial outgrowth is observed.

122