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- HAMANO Yoshiteru
- Government Industrial Research Institute
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- KINOSHITA Makoto
- Government Industrial Research Institute
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- OISHI Yasumichi
- Government Industrial Research Institute
Bibliographic Information
- Other Title
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- アルミナのホットプレス中に起こる異状な結晶成長とオリエンテーション
- アルミナ ノ ホットプレス チュウ ニ オコル イジョウ ナ ケッショウ セイチョウ ト オリエンテーション
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Abstract
Hot-pressing of alumina was caried out at 1700°-1900°C and 200-250kg/cm2 for 5-60 min in graphite molds heated by high-frequency induction. Three types of structures were microscopically observed in hot-pressed specimens, depending on hot-pressing conditions. Temperature increase under constant high pressures from low to high temperatures tended to give the layered-typed bodies consisting of the structures varied near outer surfaces and in central parts. Application of pressure subsequent to temperature increase gave comparatively homogeneous structures in hot-pressed alumina, in which noticeable orientation was observed under microscope and by X-ray diffraction method. In the oriented-typed specimens, the c-axes of alumina crystallites tended to be parallel to the hot-pressing direction. The orientation degree was determined by X-ray diffraction method in comparison with a standard specimen with an at-random structure. In the cases where temperature was increased by about 50°C during hot-pressing under the conditions which should give the above-described homogeneous oriented-typed structures, enhanced grain growth tended to be caused in alumina specimens which contained 0.6% Na2O, while the alumina with 0.08% Na2O showed no enhanced grain growth. The lengths of grain growth were often observed to be about 1mm. The bending strengths of grown-typed specimens were about one forth of those of oriented-typed ones.
Journal
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- Journal of the Ceramic Association, Japan
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Journal of the Ceramic Association, Japan 70 (798), 165-171, 1962
The Ceramic Society of Japan
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Details 詳細情報について
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- CRID
- 1390001205248042368
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- NII Article ID
- 110002302458
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- NII Book ID
- AN00245650
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- ISSN
- 18842127
- 00090255
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- NDL BIB ID
- 9214826
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed