Interfaces in Ceramic Matrix Composites

Lewis, M. H.

doi:10.1016/b0-08-042993-9/00097-8

Cited by 3 publications

(2 citation statements)

References 71 publications

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“…The way in which the different phases are assembled in the microstructure significantly determines the resulting corrosion behavior [4]. Refractories are generally composed of large filler grains of high melting point and a smaller grained second phase to impart high temperature bonding and packing [5]. High-melting bond phases between the refractory grains are favorable while low melting phases with a high degree of wetting are avoided when possible.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of Industrial Chromite and Spinel Cement Kiln Refractories with Emphasis on the Iron-Rich Rims

Mercanköşk

Akkurt

Çiftçioğlu

2004

KEM

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Abstract. Magnesia-chromite (MgO + MgO⋅Cr 2 O 3 ) and magnesia-spinel (MgO + MgO⋅Al 2 O 3 ) refractory bricks that are used in the high temperature zones of rotary cement kilns are investigated for their microstructural characteristics. Their microstructures are important because the size, shape and distribution of periclase grains, chromites and the quality of their bonding phases significantly affect their service performances. The purpose of this study was to characterize the microstructures of industrial brick samples to develop a protocol to compare different products e.g. for evaluation as replacement bricks. In some of the chromite containing bricks iron-rich rims were observed, while a domestic brick with similar chemistry had no such feature. These iron-rich rims were examined using SEM-EDS. It was found that the counter-diffusion of Fe +3 and Cr +3 were responsible for their formation. Exsolved chrome-spinel was widely observed in the microstructures of chromite bricks. Magnesia-spinel bricks were found to contain low melting calcium aluminates as bond phases in the microstructure, posing a threat to service performance. Portmortem microanalysis of industrially used bricks revealed alkali attack in addition to creep as main destruction mechanisms for brick. Traces of elements like Mo, S and alkalies were observed and thought to originate from the use of waste derived fuels.

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Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of Industrial Chromite and Spinel Cement Kiln Refractories with Emphasis on the Iron-Rich Rims

Mercanköşk

Akkurt

Çiftçioğlu

2004

KEM

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“…이러한 단량체의 취성파괴 완화와 인 성증진을 위하여 탄소 섬유나 탄화규소 섬유를 이용하여 장섬유강화 복합체를 제조하는 연구가 진행되고 있으며, 복합체의 섬유와 기지 사이에 계면을 증착시켜 인성을 향 상 시키는 연구가 진행되고 있다. 1) 일반적으로 섬유와 기 지상의 계면은 약한 결합력을 가지는 물질인 열분해 탄 소(pyrolytic carbon: PyC)나 BN을 사용하며, 보다 복잡한 균열성장 경로를 유도하기 위해서 계면으로 탄화규소와 열분해 탄소를 번갈아 증착한 다층 구조의 증착층이나 열 분해 탄소에 탄화규소 입자가 2차상으로 분산된 증착층 을 이용하기도 한다. [2][3][4] 계면은 탄화규소를 근간으로 하 는 섬유와 기지 사이에 존재하여 응력전달 시 응력완화 와 응력으로 인해 성장되는 균열이 섬유에 직접적으로 전 달되지 않게 편향시키는 역할을 한다.…”

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Fracture Behaviors and Mechanical Properties of SiC_f/SiC Composites Prepared by the Whisker Growing Assisted CVI Process

Kang¹,

Kim²,

Yoon³

et al. 2009

Journal of the Korean Ceramic Society

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SiC f /SiC composites with whiskers and pyrolytic carbon (PyC) coated whiskers in the matrix were fabricated for enhancement of the fracture behaviors by the whisker growing assisted chemical vapor infiltration (WA-CVI) process, respectively. SiC f /SiC composites were also prepared by the conventional CVI process as reference material. The mechanical properties and fracture behaviors were analyzed by comparison of the two types of composites prepared by WA-CVI and conventional CVI. The densities of SiC f /SiC composites were in the range of 2.6~2.65 g/cm 3 . The flexural strengths of composite with whiskers and with those coated by PyC were 650 MPa and 600 MPa, respectively. The tensile strength of composites with whiskers was ~285 MPa.

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Modeling the two-way coupling of stress, diffusion, and oxidation in heterogeneous CMC microstructures

Schichtel¹,

Chattopadhyay²

2023

Journal of the European Ceramic Society

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Interfaces in Ceramic Matrix Composites

Cited by 3 publications

References 71 publications

Microstructural Characterization of Industrial Chromite and Spinel Cement Kiln Refractories with Emphasis on the Iron-Rich Rims

Microstructural Characterization of Industrial Chromite and Spinel Cement Kiln Refractories with Emphasis on the Iron-Rich Rims

Fracture Behaviors and Mechanical Properties of SiC_f/SiC Composites Prepared by the Whisker Growing Assisted CVI Process

Modeling the two-way coupling of stress, diffusion, and oxidation in heterogeneous CMC microstructures

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Interfaces in Ceramic Matrix Composites

Cited by 3 publications

References 71 publications

Microstructural Characterization of Industrial Chromite and Spinel Cement Kiln Refractories with Emphasis on the Iron-Rich Rims

Microstructural Characterization of Industrial Chromite and Spinel Cement Kiln Refractories with Emphasis on the Iron-Rich Rims

Fracture Behaviors and Mechanical Properties of SiCf/SiC Composites Prepared by the Whisker Growing Assisted CVI Process

Modeling the two-way coupling of stress, diffusion, and oxidation in heterogeneous CMC microstructures

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Fracture Behaviors and Mechanical Properties of SiC_f/SiC Composites Prepared by the Whisker Growing Assisted CVI Process