Preparation of Whisker-reinforced high thermal conductive AlN ceramic substance.
| Project/Area Number |
12650667
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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 |
Inorganic materials/Physical properties
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| Research Institution | Niigata University |
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Principal Investigator |
HOTTA Noriyasu Faculty of Engineering, Niigata University, Associate Professor, 工学部, 助教授 (30018676)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Aluminum nitride / Whisker / Fine powder / Synthesis / Sintering / Rein-forced ceramics / High thermal conductivity / Ceramic substance |
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| Research Abstract |
Fine aluminum nitride (AlN) powder and pure AlN whiskers were synthesized by ffloating-type fluidized-bed nitridation (continuous direct nitridation) of ultra-pure aluminum(Al) powder (99.99 purity, 20 μm of diameter). Synthesis mechanism of the AlN nitrides and their properties were investigated. Following, The AlN whiskers reinforced composite materials were prepared, and these properties were measured.
High sinterable, pure and fine AlN (about 0.2 μm of diameter) powders were synthesized by the explosive nitridation of Al powder, and then pure AlN whiskers were produced on the reactor wall. White AlN whiskers having rough surface were synthesized by nitridatiuon of Al particles and nitrogen (N_2) gas. On the other hand, Transparent AlN whiskers having smooth surface were produced by using N_2-NH_3 gas mixture as a reactant gas. The white AlN whiskers having rough surface had good sinterability, however, the whiskers revealed poor resistance to oxidation and water. Transparent AlN whiskers having smooth surface had poor sinterability, and revealed high resistance to oxidation and water.
Transparent, dense and high strength AlN ceraic was obtained by hot-pressing of the white AlN whiskers at 1900 for 120 min under 30 MPa in N_2 atmosphere. The thermal expansion coefficient of whisker-resin composite material was 3.44X10-5/K, which was similar to the comm on metals. The thermal conductivity of ones was 7.0 W/mK. The value was 35 times as much as that of ther resin. Whisker-powder composite AlN ceramic having high thermal conductivity of 157 W/mK, was produced by hot-pressing at 1900 for 120 min under 30 MPa in N_2 atmosphere.
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Report
(3 results)
Research Products
(9 results)
