A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
PRODUCTION METHOD OF ALUMINA SINTERED BODY
PROBLEM TO BE SOLVED: To provide a production method by which there can be obtained an alumina sintered body having sufficient smoothness even without grinding and polishing.SOLUTION: The method for producing an alumina sintered body of the present invention provides an aluminum sintered body in a second sintered state by sintering an alumina compact via an aluminum intermediate in a first sintered state. In this production method, surroundings of the alumina intermediate is converted to an atmosphere containing Al at least in the step where an alumina intermediate is converted to an alumina sintered body. According to this production method, an alumina sintered body having sufficient smoothness can be obtained even without grinding and polishing. The reason for this is not clear but it is presumed that, during the course of conversion from the alumina intermediate to the alumina sintered body, in-plane surface smoothness of the sintered particles is imoproved and, moreover, the Al-containing atmosphere effectively prevents generation of a step in the grain boundary present between the sintered particles.SELECTED DRAWING: None
【課題】研削・研磨加工を施さなくても十分平滑性の高いアルミナ焼結体が得られる製法を提供する。【解決手段】本発明のアルミナ焼結体の製法は、アルミナ成形体を焼成して第１の焼結状態のアルミナ中間体を経て第２の焼結状態のアルミナ焼結体を得るアルミナ焼結体の製法である。この製法では、少なくとも前記アルミナ中間体から前記アルミナ焼結体に変化する段階では、前記アルミナ中間体の周りをＡｌ含有雰囲気にする。この製法によれば、研削・研磨加工を施さなくても十分平滑性の高いアルミナ焼結体を得ることができる。その理由は定かではないが、アルミナ中間体からアルミナ焼結体に至る途中で、焼結粒子の面内での平坦性を改善するだけでなく、焼結粒子同士の間に存在する粒界に段差が発生するのをＡｌ含有雰囲気が有効に抑制したのではないかと推察される。【選択図】なし
PRODUCTION METHOD OF ALUMINA SINTERED BODY
PROBLEM TO BE SOLVED: To provide a production method by which there can be obtained an alumina sintered body having sufficient smoothness even without grinding and polishing.SOLUTION: The method for producing an alumina sintered body of the present invention provides an aluminum sintered body in a second sintered state by sintering an alumina compact via an aluminum intermediate in a first sintered state. In this production method, surroundings of the alumina intermediate is converted to an atmosphere containing Al at least in the step where an alumina intermediate is converted to an alumina sintered body. According to this production method, an alumina sintered body having sufficient smoothness can be obtained even without grinding and polishing. The reason for this is not clear but it is presumed that, during the course of conversion from the alumina intermediate to the alumina sintered body, in-plane surface smoothness of the sintered particles is imoproved and, moreover, the Al-containing atmosphere effectively prevents generation of a step in the grain boundary present between the sintered particles.SELECTED DRAWING: None
【課題】研削・研磨加工を施さなくても十分平滑性の高いアルミナ焼結体が得られる製法を提供する。【解決手段】本発明のアルミナ焼結体の製法は、アルミナ成形体を焼成して第１の焼結状態のアルミナ中間体を経て第２の焼結状態のアルミナ焼結体を得るアルミナ焼結体の製法である。この製法では、少なくとも前記アルミナ中間体から前記アルミナ焼結体に変化する段階では、前記アルミナ中間体の周りをＡｌ含有雰囲気にする。この製法によれば、研削・研磨加工を施さなくても十分平滑性の高いアルミナ焼結体を得ることができる。その理由は定かではないが、アルミナ中間体からアルミナ焼結体に至る途中で、焼結粒子の面内での平坦性を改善するだけでなく、焼結粒子同士の間に存在する粒界に段差が発生するのをＡｌ含有雰囲気が有効に抑制したのではないかと推察される。【選択図】なし
PRODUCTION METHOD OF ALUMINA SINTERED BODY
アルミナ焼結体の製法
WATANABE MORIMICHI (author) / SATO KEI (author) / NANATAKI TSUTOMU (author) / OKOUCHI SOTA (author)
2017-10-05
Patent
Electronic Resource
Japanese
IPC:
C04B
Kalk
,
LIME
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