Development of new heat-resistant structural composite materials by MGC bulk and fiber crystals

MGC块体和纤维晶体开发新型耐热结构复合材料

• 批准号: 12555205
• 负责人: YOSHIKAWA Akira
• 金额: $ 7.1万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555205/
• 关键词: Eutectics; micro-Pulling-Down method; Structural material; Single crystal; saving energy; 酸化物共晶体; 高温強度; 強化繊維; MGC材料; 超高温構造材料; 融液成長; 酸化物; マイクロ引下げ法

In this study, we investigated Melt Growth Composite (MGC) materials which can be used as structural materials at high temperature region around 1500℃ in air atmosphere. We established crystal growth method of MGC materials. We applied shape-control technique and achieved to fabricate fiber, plate and rod-shaped MGC materials. We studied several systems of MGC crystals and discovered highest strength in Y_3Al_5O_<12>(YAG)/AL_2O_3(sapphire)/ZrO_2(zirconia) ternary system.1. Establishment of crystal growth method of MGC materialsTo develop a thermally stable reinforcement materials which can be used at 1700℃, we investigated the conditions for stable growth of high quality, homogeneous eutectics crystals with controlled microstructure. By modifying the micro-pulling-down method with crucible, hot zone etc., we have established a new crystal growth technique for the eutectic crystals. We have clarified the relative orientations and method to control the microstructure of the eutectic comp … More onents of YAG and sapphire, by TEM electron diffraction analysis.2. Shaped crystal growthThe meniscus was well controlled by the end shape of the crucible, and we found a strong relation between meniscus and shape of grown crystals. Based on this observation, we achieved growing bulk eutectic crystals up to 5mmφ in diameter, plate crystals up to 10mm width, fiber crystals around 150μm in diameter. This crystal shape control technique can be applied for various field of related industry.3. Strength in high temperatureWe investigated several eutectic systems to search for the material which has higher strength than sapphire/YAG binary system. Among these, sapphire/YAG/zirconia ternary system showed highest strength. We tested tensile strength at room temperature in air atmosphere and at 1500℃ in Ar, and measured fundamental physical properties of the grown crystals such as thermal expansion coefficient etc. Tensile strengths reached 1730MPa at room temperature and 970MPa at 1200℃ in Ar atmosphere which is highest value in the world. Less

在这项研究中，我们研究了可在空气气氛中1500℃左右高温区域用作结构材料的熔融生长复合材料（MGC）。我们建立了MGC材料的晶体生长方法。我们应用形状控制技术实现了纤维状、板状和棒状MGC材料的制造。我们研究了几种MGC晶体体系，发现Y_3Al_5O_<12>(YAG)/AL_2O_3(蓝宝石)/ZrO_2(氧化锆)三元体系的强度最高。 1． MGC材料晶体生长方法的建立为了开发可在1700℃下使用的热稳定增强材料，我们研究了具有受控微观结构的高质量、均匀共晶晶体的稳定生长条件。通过对坩埚、热区等微下拉法的改进，建立了共晶晶体生长的新工艺。通过TEM电子衍射分析，明确了YAG和蓝宝石共晶组织的相对取向和微观结构控制方法。 2．异形晶体生长弯月面很好地受到坩埚末端形状的控制，我们发现弯月面和生长晶体的形状之间存在很强的关系。基于这一观察，我们实现了直径达5mmφ的块状共晶晶体、宽度达10mm的板状晶体、直径约150μm的纤维晶体。该晶形控制技术可应用于相关工业的各个领域。 3．高温强度我们研究了几种共晶体系，以寻找比蓝宝石/YAG二元体系具有更高强度的材料。其中，蓝宝石/YAG/氧化锆三元体系表现出最高的强度。我们测试了室温空气气氛和1500℃氩气气氛下的拉伸强度，并测量了生长晶体的热膨胀系数等基本物理性能。室温拉伸强度达到1730MPa，1200℃氩气气氛拉伸强度达到970MPa，为世界最高值。较少的

项目成果

A.Yoshikawa et al.: "{Y_<3-X>, YB_X}[Ga]_2(Ga)_3O_<12> and {Lu_2Yb_1}[Al]_2(Al)_3O_<12> singl crystals for scintillator application grown by the modified micro-pulling down method"Nucl.Instrum.Method Phys.Res.. 486. 79-82 (2002)

A.Yoshikawa 等人：“用于闪烁体应用生长的{Y_<3-X>, YB_X}[Ga]_2(Ga)_3O_<12> 和 {Lu_2Yb_1}[Al]_2(Al)_3O_<12> 单晶

A.Yoshikawa: "Fiber crystal growth from the melt-Micro-pulling down method-Chapter6"Springer-Verlag Berlin Heidelberg (in press). (2002)

A.Yoshikawa：“熔体中的纤维晶体生长-微拉法-第6章”Springer-Verlag Berlin Heidelberg（出版中）。

J.B.Shim et al.: "Eu^<3+> deped Bi_4Ge_3O_<12> fiber single crystals grown by the micro-pulling-down method"J. of Crystal Growth. 245. 67-72 (2002)

J.B.Shim等：“微下拉法生长的Eu^<3>掺杂Bi_4Ge_3O_<12>纤维单晶”J.

A. Yoshikawa: "Application physics handbook"Maruzen. (2003)

A.吉川：《应用物理手册》丸善。

吉川 彰: "応用物理ハンドブック、第2版、Chapter7.2.8c"丸善株式会社(印刷中). (2003)

Akira Yoshikawa：“应用物理手册，第 2 版，第 7.2.8c 章”Maruzen Co., Ltd.（印刷中）。