A technique was developed to detect the onset, size, evolution, and anisotropy of surface microcracks in ceramic composite materials as a function of applied stress. The method is based on measuring the electrical resistance changes of a thin gold film sputtered on the surface of the composite as a function of stress. The technique was applied to the tensile surfaces of a 90/0/90, single crossply, 50 vol% SiC-LAS composite bars subjected to three-point bending. The resistance changes during the first loading cycle were found to be a strong function of the surface condition prior to testing. The onset of microcracking varied between 70 and 160 MPa. The anisotropy in the resistance changes in two orthogonal directions demonstrated that, for a given stress, the damage resulting from axial cracks was comparable to that of matrix cracks and occurred simultaneously. Furthermore, the matrix cracks were found to close more readily than the axial ones. The resistance changes were converted to crack lengths assuming that one large crack extended normal to the applied stress. The presence of such cracks was confirmed by SEM. How this method can be used nondestructively to assess the integrity of a finished surface is also discussed.

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Ceramic and glass-ceramic lasers

Michel Mortier · Annales de Chimie Science des Matériaux · 2003

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Ceramic/ceramic total hip arthroplasty

Pascal Bizot, R. Nizard, Sophie Lerouge et al. · Journal of Orthopaedic Science · 2000

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Braze material for joining ceramic to metal and ceramic to ceramic surfaces and joined ceramic to metal and ceramic to ceramic article

Thomas K. Hunt · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 2023

An improved active metal braze filler material is provided in which the coefficient of thermal expansion of the braze filler is more closely matched with that of the ceramic and metal, or two ceramics, to provide ceramic to metal, or ceramic to ceramic, sealed joints and articles which can withstand both high temperatures and repeated thermal cycling without failing. The braze filler material comprises a mixture of a material, preferably in the form of a powder, selected from the group consisting of molybdenum, tungsten, silicon carbide and mixtures thereof, and an active metal filler material selected from the group consisting of alloys or mixtures of nickel and titanium, alloys or mixtures of nickel and zirconium, alloys or mixtures of nickel, titanium, and copper, alloys or mixtures of nickel, titanium, and zirconium, alloys or mixtures of niobium and nickel, alloys or mixtures of niobium and zirconium, alloys or mixtures of niobium and titanium, alloys or mixtures of niobium, titanium, and nickel, alloys or mixtures of niobium, zirconium, and nickel, and alloys or mixtures of niobium, titanium, zirconium, and nickel. The powder component is selected such that its coefficient of thermal expansion will effect the overall coefficient of thermal expansion of the braze material so that it more closely matches the coefficients of thermal expansion of the ceramic and metal parts to be joined.

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Ceramic

Aaron Brody · Open Context · 2010

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Ceramic

X, XBZ · Figshare · 2025

Alumina ceramics are widely used in biomedical and aerospace manufacturing because of their excellent properties, including high-temperature resistance, corrosion resistance, and high strength.

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Ceramic

San Diego Archaeological Center · Open Context · 2010

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Ceramic

M. Nouri Khezrabadia, R. Naghizadehb, P. Assadollahpoura et al. · 2016

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Ceramic

2014

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ceramic

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Ceramic

S. Abedini Khorramia, G. Mahmoudzadeha, S. S. Madania et al. · 2014

Effect of calcination temperature on the particle sizes of zinc ferrite prepared by a combination of sol-gel auto combustion and ultrasonic irradiation techniques

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Ceramic

Stanish, Charles · Digital Commons - University of South Florida (University of South Florida) · 2014

https://digitalcommons.usf.edu/andean_adp/1000/thumbnail.jpg

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