2001 Fiscal Year Final Research Report Summary
Improbement of Oxidation Resistance and Its mechanisms in Fiber Reinforced Ceramic Matrix Composites
| Project/Area Number |
12650895
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Aerospace engineering
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| Research Institution | The University of Tokyo (2001)
The University of Electro-Communications (2000) |
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Principal Investigator |
ZHU Shijie Institute of Industrial Science, The University of Tokyo, Associate Professor, 生産技術研究所, 助教授 (60283032)
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| Project Period (FY) |
2000 – 2001
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| Keywords | Composite / SiC / SiC / Oxidation Resistance / Creep |
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| Research Abstract |
Creep and oxidation behavior of SiC/SiC composites were studied using macroscopic and microscopic experimental techniques and analysis methods in the past two years. To treat and analyze experimental data, a personal computer was bought in 2000. The results and achievements are summarized as follows.
(1) Creep tests were carried out in both air and argon to study the effects of oxidation on creep deformation and damage. SEM and EPMA were used to observe microstructures and measure element distribution in fiber, matrix and interfaces between fiber and matrix before and during creep-oxidation tests. The partial unloading technique was used to measure Young's modulus during creep tests, which is a indirect detection method for damage.
(2) Three methods for improving oxidation resistance were evaluated. It was found that the addition of glassy particulates in the matrix and glass-healing on surfaces are effective for improbement of oxidation and creep properties at high temperatures. The effects of the addition of glassy particulates in the matrix on creep crack growth were found. However, both of them were not effective at intermediate temperatures.
(3) The modification of interphase, e. g., using BN to replace carbon coating, is a good method, but BN is still not promising coating materials for fibers.
(4) It was found that stability of microstructure in fiber at high temperatures was also important on creep properties. This is why creep resistance of the composite in argon is lower than that in air if there is no severe oxidation on surfaces by glass-sealing.
(5) Based on experimental results and theoretical analysis, a method was proposed for life prediction at creep-oxidation and how to improve oxidation resistance was pointed out.
(6) The research results of this project were published on conferences and joumals. A few papers will be published in journals in the near future.
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Research Products
(10 results)
