2002 Fiscal Year Annual Research Report

新規評価法に立脚するアルミナ焼結体の破壊源形成原因の直接的解明と強度変動抑止

Research Project

Project/Area Number	11305045
Research Institution	Nagaoka University of Technology
Principal Investigator	植松敬三長岡技術科学大学, 工学部, 教授 (00110726)
Co-Investigator(Kenkyū-buntansha)	内田希長岡技術科学大学, 工学部, 助教授 (00193897)
Keywords	アルミナ / セラミックス / 製造 / 破壊源 / 強度 / 評価法 / 微構造 / 強度変動
Research Abstract	本研究者の開発した新規評価法がセラミックス製造時の破壊源やその形成過程を具体的に解析する能力を有することに着目し、まずこれを駆使してアルミナセラミックス製造プロセスにおける破壊源形成過程を追跡してその生成原因を解明し、次に破壊源が強度特性に及ぼす影響を直接的に検証して挙度変動の原因を解明し、さらにまたは開眼形成防止法を提案して、セラミックス製造工学の革新に資することを目的に、アルミナセラミックスの加圧成形による製造を対象に研究を行った。その結果、破壊源が顆粒の不完全な潰れにより生じた顆粒界面の不均質から生じることを始めて直接的に明らかにした。また、それら破壊源が、シミュレーションによりセラミックスの強度を支配する因子であることも明らかにし、破壊力学の正当性を始めて構造面から実証した。これらの研究とあわせて、評価法をさらに改良してセラミックス内部構造に関する知見をさらに高度化した。それら新規な評価法を用いて、粉体処理条件、スプレードライ条件、加圧成形条件、環境因子、焼結条件、加工条件等、破壊源形成に及ぼす種々の因子について、その形成に及ぼすメカニズムを検討し、それらを制御することにより、工業原料を用いたアルミナセラミックスとして従来の約5割高強度の、平均強度500MPa、ワイブル係数20程度をもつ高強度・高信頼性アルミナセラミックスを得た。これらの成果は、国内外の論文22報として公表した。

Research Products
(26 results)

All Other

All Publications (26 results)

[Publications] Y.Zhang, M.Inoue, N.Uchida, K.Uematsu: "Characterization of processing pores and their relevance to the strength in alumina ceramics"J. Mater. Res.. 14[8]. 3370-3374 (1999)
[Publications] K.Uematsu, M.Saito: "Liquid immersion technique coupled with IR-microscopy for direct observation of internal structure of ceramic powder compact -with alumina as an example"J. Mater. Res.. 14[12]. 4463-4465 (1999)
[Publications] K.Uematsu, N.Uchida, Z.Kato, S.Tanaka, T.Hotta, M.Naito: "IR microscopy for examination of particle packing structure in silicon nitride powder granules and a compact"J. Am. Ceram. Soc.. 84[1]. 254-256 (2001)
[Publications] Anze Shui, Zenji Kato, Satoshi Tanaka, N.Uchida, K.Uematsu: "Isotropic sintering shrinkage in pressed compact of near-spherical alumina particles"Bull. Am. Ceram. Soc.. 80[9]. 29-32 (2001)
[Publications] Z.Kato, N.Uchida, K.Uematsu, Y.Zhang: "Quantitative analysis of a binder segregation in granules"Ceramic Trasactions. 112. 501-506 (2001)
[Publications] 斉藤豊, 植松敬三: "セラミック成形体内部気孔構造の新規評価方法"J. Ceram. Soc. Japan. 109[10]. 901-902 (2001)
[Publications] Y.Saito, S.Tanaka, N.Uchida, K.Uematsu: "Direct Evidence for Low-Density Regions in Compacted Spray-Dried Powders"J. Am. Ceram. Soc.. 84[10]. 2454-2456 (2001)
[Publications] K.Uematsu, T.Sato, D.Shoji, N.Uchida, Z.Kato, S.Tanaka, M.Naito, T.Hotta: "Infrared microscopy for innovative research in ceramics"Ceramics Trans.. 122. 157-171 (2001)
[Publications] 佐藤和好, 佐藤匠海, 武蔵徳明, 田中諭, 内田希, 植松敬三: "共焦点走査型レーザー顕微鏡を用いたアルミナセラミックスの破面解析"J. Ceram. Soc. Japan. 109[12]. 1055-1056 (2001)
[Publications] A.Shui, Z.Kato, S.Tanaka, Nozomu Uchida, Keizo Uematsu: "Sintering deformation caused by particle orientation in uniaxially and isostatically pressed alumina compacts"J. Europian Ceram. Soc.. 311-316 (2002)
[Publications] Y.Saito, S.Tanaka, N.Uchida, K.Uematsu: "CSLM for ceramic green microstructure"American Ceramic Socisty Bulletin. 81[1]. 35-38 (2002)
[Publications] Z.Kato, S.Tanaka, Un Uchida, K.Uematsu: "A novel method to investigate the non-uniformity of the internal structure ofgranule compact"Key Engineering Materials. vol. 206-13. 341-344 (2002)
[Publications] N.Uchida, T.Hiranami, S.Tanaka, K.Uematsu: "Spray-freeze-dried granules for Ceramics fabrication"American Ceramic Socisty Bulletin. 81[2]. 57-60 (2002)
[Publications] 斉藤豊, 田中諭, 内田希, 植松敬三: "多孔材料内部構造の新規評価方法"J. Society of Inorganic Materials, Japan. 9. 105-108 (2002)
[Publications] Y.Saito, J.Nyumura, K.Fukai, Y.Zhang, N.Uchida, K.Uematsu: "Moisture diffusion in alumina green compact containing polyvinyl alcohol binder"J. Ceram. Soc. Japan. 110[4]. 237-242 (2002)
[Publications] A.Shui, A.Makiya, S.Tanaka, N.Uchida, K.Uematsu: "Effect of cold isostatic pressing on microstructure and sintering anisotropy during sintering of uniaxially pressed alumina compacts"J. Ceram. Soc. Japan. 110[4]. 264-269 (2002)
[Publications] A.Shui, M.Saito, N.Uchida, K.Uematsu: "Development of Anisotropic Microstructure in Uniaxially Pressed Alumina Compacts"J. Europian Ceram. Soc.. 22. 1217-1223 (2002)
[Publications] K.Uematsu, Y.Saito, S.Tanaka: "Breakthrough in evaluation method for packing structure of powders"Trans. MRS. Japan. 27[2]. 333-338 (2002)
[Publications] Anze Shui, Nozomu Uchida, Keizo Uematsu: "Origin of shrinkage anisotropy during sintering of uniaxially pressed alumina compacts"Powder Technology. 127[1]. 9-18 (2002)
[Publications] N.Shinohara, S.katori, M.Okumiya, T.Hotta, K.Nakahira, M.Naito, Y.-I.Cho, K.Uematsu: "Effect of Heat treatment of alumina granules on the compaction behavior and properties of green and sintered bodies"J. Europian Ceramic Society. 22. 2841-2848 (2002)
[Publications] Y.Hotta, H.Abe, M.Naito, K.Kamiya, K.Uematsu: "Effect of Slurry Flocculation the Microstructure of Alumina Green Bidies Prepared by Slip Casting"Ceramic Transaction. 133. 159-164 (2002)
[Publications] Y.-I.Cho, S.-J.Kim, M.Okumiya, M.Naito, K.Uematsu: "Effect of the Manufacturing Process on the Properties of Alumina Sintered Ceramics"Ceramic Transaction. 133. 165-170 (2002)
[Publications] Y.-I.Cho, M.Okumiya, M.Naito, T.Rae, R.Waesche, R.Morrell, K.G.Ewusk, V.Hackley, S.Freiman, K.Uematsu: "Characterization of Course Particles Contained in Fine Powders at Very Low Concentrations"Ceramic Transaction. 133. 71-76 (2002)
[Publications] Y.Saito, S.Tanaka, N.Uchida, K.Uematsu: "New Method to Observe the Internal Structure of a Green Body Using a Confocal Laser Scanning Microscope"Ceramic Transaction. 133. 99-104 (2002)
[Publications] Z.Kato, T.Sato, S.Tanaka, N.Uchida, K.Uematsu: "Mid-Infrared Microscopy"American Ceramic Socisty Bulletin. 81[12]. 42-44 (2002)
[Publications] S.Tanaka, Z.Kato, N.Uchida, K.Uematsu: "Direct Observation of Agglomerates and Aggregates in Alumina Granules"Powder Technology. 129[1]. 153-155 (2003)

2002 Fiscal Year Annual Research Report

新規評価法に立脚するアルミナ焼結体の破壊源形成原因の直接的解明と強度変動抑止

Principal Investigator

植松 敬三 長岡技術科学大学, 工学部, 教授 (00110726)

Research Products

[Publications] Y.Zhang, M.Inoue, N.Uchida, K.Uematsu: "Characterization of processing pores and their relevance to the strength in alumina ceramics"J. Mater. Res.. 14[8]. 3370-3374 (1999)

[Publications] K.Uematsu, M.Saito: "Liquid immersion technique coupled with IR-microscopy for direct observation of internal structure of ceramic powder compact -with alumina as an example"J. Mater. Res.. 14[12]. 4463-4465 (1999)

[Publications] K.Uematsu, N.Uchida, Z.Kato, S.Tanaka, T.Hotta, M.Naito: "IR microscopy for examination of particle packing structure in silicon nitride powder granules and a compact"J. Am. Ceram. Soc.. 84[1]. 254-256 (2001)

[Publications] Anze Shui, Zenji Kato, Satoshi Tanaka, N.Uchida, K.Uematsu: "Isotropic sintering shrinkage in pressed compact of near-spherical alumina particles"Bull. Am. Ceram. Soc.. 80[9]. 29-32 (2001)

[Publications] Z.Kato, N.Uchida, K.Uematsu, Y.Zhang: "Quantitative analysis of a binder segregation in granules"Ceramic Trasactions. 112. 501-506 (2001)

[Publications] 斉藤豊, 植松敬三: "セラミック成形体内部気孔構造の新規評価方法"J. Ceram. Soc. Japan. 109[10]. 901-902 (2001)

[Publications] Y.Saito, S.Tanaka, N.Uchida, K.Uematsu: "Direct Evidence for Low-Density Regions in Compacted Spray-Dried Powders"J. Am. Ceram. Soc.. 84[10]. 2454-2456 (2001)

[Publications] K.Uematsu, T.Sato, D.Shoji, N.Uchida, Z.Kato, S.Tanaka, M.Naito, T.Hotta: "Infrared microscopy for innovative research in ceramics"Ceramics Trans.. 122. 157-171 (2001)

[Publications] 佐藤和好, 佐藤匠海, 武蔵徳明, 田中諭, 内田希, 植松敬三: "共焦点走査型レーザー顕微鏡を用いたアルミナセラミックスの破面解析"J. Ceram. Soc. Japan. 109[12]. 1055-1056 (2001)

[Publications] A.Shui, Z.Kato, S.Tanaka, Nozomu Uchida, Keizo Uematsu: "Sintering deformation caused by particle orientation in uniaxially and isostatically pressed alumina compacts"J. Europian Ceram. Soc.. 311-316 (2002)

[Publications] Y.Saito, S.Tanaka, N.Uchida, K.Uematsu: "CSLM for ceramic green microstructure"American Ceramic Socisty Bulletin. 81[1]. 35-38 (2002)

[Publications] Z.Kato, S.Tanaka, Un Uchida, K.Uematsu: "A novel method to investigate the non-uniformity of the internal structure ofgranule compact"Key Engineering Materials. vol. 206-13. 341-344 (2002)

[Publications] N.Uchida, T.Hiranami, S.Tanaka, K.Uematsu: "Spray-freeze-dried granules for Ceramics fabrication"American Ceramic Socisty Bulletin. 81[2]. 57-60 (2002)

[Publications] 斉藤豊, 田中諭, 内田希, 植松敬三: "多孔材料内部構造の新規評価方法"J. Society of Inorganic Materials, Japan. 9. 105-108 (2002)

[Publications] Y.Saito, J.Nyumura, K.Fukai, Y.Zhang, N.Uchida, K.Uematsu: "Moisture diffusion in alumina green compact containing polyvinyl alcohol binder"J. Ceram. Soc. Japan. 110[4]. 237-242 (2002)

[Publications] A.Shui, A.Makiya, S.Tanaka, N.Uchida, K.Uematsu: "Effect of cold isostatic pressing on microstructure and sintering anisotropy during sintering of uniaxially pressed alumina compacts"J. Ceram. Soc. Japan. 110[4]. 264-269 (2002)

[Publications] A.Shui, M.Saito, N.Uchida, K.Uematsu: "Development of Anisotropic Microstructure in Uniaxially Pressed Alumina Compacts"J. Europian Ceram. Soc.. 22. 1217-1223 (2002)

[Publications] K.Uematsu, Y.Saito, S.Tanaka: "Breakthrough in evaluation method for packing structure of powders"Trans. MRS. Japan. 27[2]. 333-338 (2002)

[Publications] Anze Shui, Nozomu Uchida, Keizo Uematsu: "Origin of shrinkage anisotropy during sintering of uniaxially pressed alumina compacts"Powder Technology. 127[1]. 9-18 (2002)

[Publications] N.Shinohara, S.katori, M.Okumiya, T.Hotta, K.Nakahira, M.Naito, Y.-I.Cho, K.Uematsu: "Effect of Heat treatment of alumina granules on the compaction behavior and properties of green and sintered bodies"J. Europian Ceramic Society. 22. 2841-2848 (2002)

[Publications] Y.Hotta, H.Abe, M.Naito, K.Kamiya, K.Uematsu: "Effect of Slurry Flocculation the Microstructure of Alumina Green Bidies Prepared by Slip Casting"Ceramic Transaction. 133. 159-164 (2002)

[Publications] Y.-I.Cho, S.-J.Kim, M.Okumiya, M.Naito, K.Uematsu: "Effect of the Manufacturing Process on the Properties of Alumina Sintered Ceramics"Ceramic Transaction. 133. 165-170 (2002)

[Publications] Y.-I.Cho, M.Okumiya, M.Naito, T.Rae, R.Waesche, R.Morrell, K.G.Ewusk, V.Hackley, S.Freiman, K.Uematsu: "Characterization of Course Particles Contained in Fine Powders at Very Low Concentrations"Ceramic Transaction. 133. 71-76 (2002)

[Publications] Y.Saito, S.Tanaka, N.Uchida, K.Uematsu: "New Method to Observe the Internal Structure of a Green Body Using a Confocal Laser Scanning Microscope"Ceramic Transaction. 133. 99-104 (2002)

[Publications] Z.Kato, T.Sato, S.Tanaka, N.Uchida, K.Uematsu: "Mid-Infrared Microscopy"American Ceramic Socisty Bulletin. 81[12]. 42-44 (2002)

[Publications] S.Tanaka, Z.Kato, N.Uchida, K.Uematsu: "Direct Observation of Agglomerates and Aggregates in Alumina Granules"Powder Technology. 129[1]. 153-155 (2003)

植松敬三長岡技術科学大学, 工学部, 教授 (00110726)