| Project/Area Number |
63550531
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ITO Kunio The University of Tokyo, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20010803)
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| Co-Investigator(Kenkyū-buntansha) |
SEKI Fumie The University of Tokyo, Faculty of Engineering, Assistant, 工学部, 助手 (20114572)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1989: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1988: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Amorphous oxide / Glass / Crystallization / Preferred orientation / Spheroidal crystal / 優先方位 / 非晶質材料 / 酸化物 / セラミックス / 結晶成長 |
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| Research Abstract |
Structure and crystallographic texture of Li2O-B203 crystallized under temperature gradients have been examined. 1) Specimens of 23-27mol%Li20 - 73-77Mol%B203 were heated in a Pt-10%Rh crucible for 1h at 873k and for 1h at 1273, and poured into a die with 15mm diameter and 3mm depth of cast iron and pressed with a plate of the same material. 2) The specimens were set on a stainless steel block heated at constant temperatures so that they might be crystallized under temperature gradients of about 5OK/mm. The temperatures of the block were controlled between 823K and 913K. 3) The crystallization begins on the surface in contact with the block. Spheroidal crystals with 0.1 - 5mm diameter grow into the matrix. They are composed of fibers. Four phases Li202B203, 2Li205B203, Li204B203-1, and Li204B203-I, are found in the layer near the surface, but only Li202B203 and Li204B203-I are present in the deeper layers. 4) Fiber-like crystallines of Li202B203 in the spheroidal crystals show preferred orientation. The indices are still not determined.
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