In-situ Observation Techniques for Interfacial Strength Properties of Continuous Ceramic Fiber Reinforced Ceramic Matrix Composites

连续陶瓷纤维增强陶瓷基复合材料界面强度性能原位观测技术

• 批准号: 02452090
• 负责人: TAKEDA Nobuo
• 金额: $ 4.42万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452090/
• 关键词: Ceramics; Composite Materials; Interfacial Strength; In-situ Observation; Optical Microscope; Scanning Electron Microscope; Scanning Acoustic Microscope

The purpose of the present study is to develop in-situ observation techniques using optical microscopes (OM), scanning electron microcscopes (SEM) and scanning acoustic microscopes (SAM) to characterize the fiber/matrix interfacial properties of continuous ceramic fiber reinforced ceramic matrix composites.First, matrix cracking behavior was observed in randomly-oriented carbon fiber reinforced borosilicate glass matrix composites, with or without precracks introduced during fabrication. Monotonic and repeated (load-unload-reload) tensile as well as four-point bending tests were conducted to identify the microscopic fracture process and mechanisms, using replica techniques (to observe matrix crack evolution), unloading modulus measurements, and AE analysis.Secondly, damage observations were conducted for the same randomly-oriented carbon fiber reinforced borosilicate glass matrix composites with thermal-shock induced matrix cracks, using replica, OM,SEM and SAM.Their in-situ observatio … More ns were also conducted during tensile tests with AE measurements. Finite element analysis provided the transient stress values to determine the fracture criteria. Microscopic fracture process and mechanisms were identified through the above study.Thirdly, in-situ OM observations were conducted for notched four-point bending specimens of unidirectional SiC (PCS) (Nicalon) fiber reinforced borosilicate glass matrix composites. Fiber/matrix interfacial strength was controlled by changing the thickness of carbon coating on SiC fibers. Then, the effects of coating thickness on microscopic damage progress and mechanisms were studied to establish the model for damage evolution. The fracture criteria were determined using finite element analysis.Fourthly, single fiber push-out and pull-out experiments were conducted for SiC (CVD) (Textron) fiber reinforced mullite matrix composites. Fabrication conditions (hot-press temperature and pressure) were changed to obtain different interfacial strength values. SEM observations and AE measurements were used to quantify the fiber pull-out behavior. Stress and energy criteria were applied to determine the debonding initiation.Finally, the importance of experimental microfracture mechanics was emphasized for ceramic matrix composites, based upon the above studies. Less

本文采用光学显微镜（OM）、扫描电子显微镜（SEM）和扫描声学显微镜（SAM）对连续陶瓷纤维增强陶瓷基复合材料的纤维/基体界面性能进行了原位观察，首先观察了无规取向碳纤维增强硼硅酸盐玻璃基复合材料的基体开裂行为，在制造过程中引入或不引入预裂纹。单调而重复通过加载-卸载-再加载拉伸和四点弯曲试验，利用复型技术确定了微观断裂过程和机制（观察基体裂纹演化）、卸载模量测量和声发射分析。其次，对具有热冲击诱导基体裂纹的相同随机取向碳纤维增强硼硅酸盐玻璃基复合材料进行了损伤观察，OM、SEM和SAM的原位观察， ...更多信息 ns也进行了拉伸试验与AE测量。有限元分析提供了瞬态应力值，以确定断裂准则。通过以上研究，确定了复合材料的微观断裂过程和断裂机制。第三，对单向SiC（PCS）（Nicalon）纤维增强硼硅酸盐玻璃基复合材料缺口四点弯曲试样进行了原位OM观察。通过改变SiC纤维表面碳涂层的厚度来控制纤维/基体的界面强度。在此基础上，研究了涂层厚度对涂层微观损伤过程和损伤机理的影响，建立了涂层损伤演化模型。第四，对SiC（CVD）（Textron）纤维增强莫来石基复合材料进行了单纤维拔出实验。改变制造条件（热压温度和压力）以获得不同的界面强度值。SEM观察和AE测量用于量化纤维拔出行为。最后，在上述研究的基础上，强调了实验微断裂力学对陶瓷基复合材料的重要性。少

项目成果

Y.Yamade, Y.Kawaguchi, N.Takeda, T.Kishi: "Interfacial Debonding Behavior of Mullite/SiC Continuous Fiber Composite" J.Am.Ceram.Soc.(to be submitted, 1993).

Y.Yamade、Y.Kawaguchi、N.Takeda、T.Kishi：“莫来石/SiC 连续纤维复合材料的界面脱粘行为”J.Am.Ceram.Soc.（待提交，1993 年）。

O.Chen,P.Karandikar,N.Takeda,T.Kishi,W.tredway.K.Prewo: "Acoustic Emission Characterization of the Fracture Mechanisms of a GlassーMatrix Composite" Ceram.Eng.Sci.Proc.12(7ー8). 1586-1598 (1991)

O.Chen,P.Karandikar,N.Takeda,T.Kishi,W.tredway.K.Prewo：“玻璃基复合材料断裂机制的声发射表征”Ceram.Eng.Sci.Proc.12(7 -8）。1586-1598（1991）。

N.Takeda, O.Chen, T.Kishi, K.Prewo: "Matrix Microcracking Damage Characterization of Discontinuous Carbon Fiber Reinforced Glass-Matrix Composites" Proc.8th Int.Conf.Comp.Mater. (Hawaii, July 1991). Sec.27-I. 1-9 (1991)

N.Takeda、O.Chen、T.Kishi、K.Prewo：“不连续碳纤维增强玻璃基复合材料的基体微裂纹损伤表征”Proc.8th Int.Conf.Comp.Mater。

P.G.Karandikar, T.W.Chou, O.Chen, N.Takeda, T.Kishi: "Microcracking and Changes in Elastic Moduli of Random, Discontinuous Celion Graphite-Borosilicate Glass Composites" Ceram.Eng.Sci.Proc.Vol.12, No.7-8. 1462-1482 (1991)

P.G.Karandikar、T.W.Chou、O.Chen、N.Takeda、T.Kishi：“随机、不连续 Celion 石墨-硼硅酸盐玻璃复合材料的微裂纹和弹性模量变化”Ceram.Eng.Sci.Proc.Vol.12，第 12 号。

N.Takeda,C.Miyasaka K.Nakata: "In-Situ Scanning Acoustic Microscopy for Damage Progress Characterization in Thermoplastic Composites" Nondestr.Test.Eval.8-9. 813-824 (1992)

N.Takeda、C.Miyasaka K.Nakata：“用于热塑性复合材料损伤进展表征的原位扫描声学显微镜”Nondestr.Test.Eval.8-9。