1997 Fiscal Year Final Research Report Summary
Preparation of new functional materials using low temperature densification by HIP
| Project/Area Number |
08650995
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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 |
無機工業化学
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| Research Institution | Science University of Tokyo |
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Principal Investigator |
ITO Shigeru Science University of Tokyo, Faculty of Science and Technology, 理工学部, 助教授 (10120164)
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| Project Period (FY) |
1996 – 1997
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| Keywords | HIP / FE_4N / saturation magnetization / corrosion resistance / oxygen content / amorphous / crystalline / silica |
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| Research Abstract |
Fe_4N magnetic material and SiO_2 amorphous-crystalline composite were sinterd at low temperature by applying Hipping pressure. At high temperature, Fe_4N decomposes and amorphous SiO_2 with crystalline SiO_2 is crystallized.
1.Hip sintering of Fe_4N The sealed capsule containing Fe_4N powder was hipped at 450-550ﾟC for 2 hours under 50-200Mpa. The maximum relative density 97% was obtained for the specimen hipped at 500ﾟC under 200MPa. THe maximum saturation magnetization 182emu/g was measured for a specimen obtained at 450ﾟC under 200MPa.
The HIP technique was also applied to the mixture of Fe_4N and Fe, in order to obtain low eddy current loss and high saturation magnetization. The resistivity of hipped Fe4N-Fe composite with 96wt% Fe_4N was 7.08 * 10^<-5> OMEGAcm, which was ten times larger than that of iron. The iron loss was decreased to 10 W by the addition 70wt% of Fe_4N to Fe, compared with 19 W in pure iron.
2.Hip sintering of SiO_2 amorphous -crystalline composite The mixed powder of alpha-quartz and SiO_2 glass was pressed into a compact with PHI 12mm * 20mm in size.The Pyrex glass capsule containing the compact was hipped at 800-1200ﾟC for 30-240 minutes under the pressure of 50-200MPa. Tne specimens with the appearance of natural agate : were obtained at 120ﾟC under 100 and 200MPa. The polarization microphotograph showed that the crystallites were in the amorphous SiO_2 matrix. Using the starting mixture with 25wt% of alpha-quartz, the maximum density of 2.50g/cm^3 was obtained at 1200ﾟC for 120 minutes under 200MPa. In this case, the maximum bending strength was obtained to be 9.2Kg/mm^2.corresponding to 70% of that in the natural agate.
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Research Products
(2 results)
