Microstructures and Properties of Functionally Gradient Materials

功能梯度材料的微观结构和性能

• 批准号: 03452242
• 负责人: OKADA Akira
• 金额: $ 3.84万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452242/
• 关键词: Functional Gradient; Interface; Surface layr; Fractography; Composite materials; Microstructure; Boundary; Coating; 境界構造; 材料特性; 破壊挙動; 複合組織; 材料特性評価; コ-ティング; フラクトグラフィ-; 複合組識

1.The functionally gradient materials (FMG) of the surface coating.(1) The structure and interface of TiC/SiC films coated on C/C composite materials were investigated by TEM,EPMA and X-ray diffraction. Strong preferred orientation exists in these layrs by the epitaxial growth.(2) The difference of bonding of TiC films on cemented carbides, WC,fabricated by PVD and CVD processes were clearly observed with the acoustic microscopy of Vickers indentations and cracks initiated from them by the SEM fractography.2.From the viewpoint of the improvement of materials property degradation at the surface layr by the formation of FGM layr, in the later half of the present reseach project, reseach work was concentrated to the surface structure of finished by ultra-fine polishing.(1) The crystal anisotropy for polishing was investigated. The direct observation of the amorphous layr on a ferrite single crystal was succeeded with the TEM.The depth of surface layr of a single crystal ferrite introduced by polishing was estimated about -3mum.(2) The structures of surface layr, such as the amorphous layr, poly crystalline layr and dislocation structures, were analyzed for polished single crystals of ferrite with various orientation.(3) The presently obtained results suggest that the effects from the surface layrs depending on crystal anisotropy, which may be undesireble for the most effective utilization of materials property, may be eliminated by covering the damaged surface with a FGM layr.

1.表面涂层的功能梯度材料(FMG)：(1)用透射电子显微镜、电子探针和X射线衍射仪研究了C/C复合材料表面TiC/碳化硅薄膜的结构和界面。(2)通过扫描电子显微镜观察硬质合金在PVD和CVD工艺制备的硬质合金WC表面形成的Vickers压痕和裂纹的声学显微镜观察到TiC薄膜与硬质合金表面结合的差异。2.从FGM层的形成改善表层材料性能退化的角度出发，在本课题的后半部分，研究工作集中在超细抛光后的表面结构上。(1)研究了抛光过程中的晶体各向异性。利用透射电子显微镜对铁氧体单晶表面的非晶层进行了直接观察，估计了单晶铁氧体抛光后的表面层深度约为-3微米。(2)分析了不同取向的铁氧体抛光单晶的表面层结构，如非晶层、多晶层和位错结构。(3)目前的结果表明，表面层的影响取决于晶体的各向异性，这可能是最有效地利用材料性能所不希望的，可以通过在损伤表面覆盖功能梯度材料层来消除。

项目成果

(1) T.Yoshida, T.Yoshiie, A.Okada, K.Hamada, I.Ishida and T.Nomura: "Microstructures and Mechanical Properties of TiC Films Coated on WC-Co Cemented Carbides Processed by PVD and CVD" Journal of the Japan Society for Precision Engineering. 57. 101-105 (19

(1) T.Yoshida、T.Yoshiie、A.Okada、K.Hamada、I.Ishida 和 T.Nomura：“PVD 和 CVD 加工的 WC-Co 硬质合金上涂覆的 TiC 薄膜的微观结构和机械性能”期刊

A.Okada,Y.Yamamota,K.Hamada,T.Yoshiie,I.Ishida and E.Hirota: "Surface Layer of Mechanically Polished Mn-Zn Ferrite Single Crystals" Materials Trans.,JIM,. 34. 73-79 (1993)

A.Okada、Y.Yamamota、K.Hamada、T.Yoshiie、I.Ishida 和 E.Hirota：“机械抛光锰锌铁氧体单晶的表面层”Materials Trans.，JIM，。

A.Okada,Y.Yamamoto et al.: "Surface Layer of Mechanically Polished Mn-Zn Ferrite Single Crystals" Mater.Trans.,JIM. 34. 343-350 (1993)

A.Okada，Y.Yamamoto 等：“机械抛光锰锌铁氧体单晶的表面层”Mater.Trans.，JIM。

(2) A.Okada, C.Miyasaka and T.Nomura: "Acoustic Microscopic Observation of the Vickers Indentation on Cemented Carbides Coated with TiC Films by PVD and CVD Processes." Materials Trans., JIM. 33. 343-350 (1992)

(2) A.Okada、C.Miyasaka 和 T.Nomura：“PVD 和 CVD 工艺涂覆 TiC 薄膜的硬质合金上维氏压痕的声学显微镜观察”。

Akira Okada Yoshifumi Yamamoto et al.: "Surface Layer of Mechanically Polished Mn-Zn Ferrite Single Crystals" Materials Trans.,JIM. 34. (1993)

Akira Okada Yoshifumi Yamamoto 等人：“机械抛光锰锌铁氧体单晶的表面层”Materials Trans.，JIM。