1998 Fiscal Year Final Research Report Summary
Microstructural Control Carbon Materials by Addition of Inorganic Compounds into a Precursor and Chemical/Mechanical Properties Improvement
| Project/Area Number |
08455297
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
TANABE Yasuhiro Tokyo Institute of Technology Materials and Structures Laboratory Associate Professor, 応用セラミックス研究所, 助教授 (70163607)
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| Co-Investigator(Kenkyū-buntansha) |
AKATSU Takashi Tokyo Institute of Technology Materials and Structures Laboratory Research Assoc, 応用セラミックス研究所, 助手 (40231807)
YASUDA Eiichi Tokyo Institute of Technology Materials and Structures Laboratory Professor, 応用セラミックス研究所, 教授 (70016830)
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| Project Period (FY) |
1996 – 1998
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| Keywords | Carbon Precursor / Inorganic Compound Addition / Microstructural Control / Chemical Properties / Mechanical Properties / Vickers Indentation |
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| Research Abstract |
Microstructure of carbon materials can be controlled by addition of carbonaceous particles into carbon precursors. Oxidation weight loss of the carbon materials depends on their microstructures, and the oxidation progresses un-uniformly in the materials. Un-uniform oxidation can be detected by Vicker's indentation technique : using the area surrounding between loading and unloading curves in indentation depth to load relationships. This area corresponds to the energy dissipated in materials, This energy is variable depending on the maximum indentation load, However, the energy corrected by the maximum indentated volume shows no-load dependence, and clearly explains increasing oxidation areas and decreasing resistance against indentation fracture. It is obvious that this technique can be applicable to analyze un-uniform oxidation behavior, which is usual in carbon material's oxidation, very precisely.
Oxidation rate of carbon materials including inorganic compounds at 700 to 1000 。C in air depends on the compounds. Precise analysis of oxidation behavior using TK (Transient Kinetics) reveals that more than two types of active sites possibly exist in carbon materials and that some elements, in this case Ta and Ti, can disactive a type of active sites. C/C composites can be prepared by using this type of matrix, and only small decreasing in shear strength is observed.
Above results indicate that carbon materials having high oxidation resistance and low strength decreasing can be prepared in this study. Moreover, a technique, by which un-uniform oxidation in a material can be quantitatively analyzed, is proposed.
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