Author: Hsien-Liang KerPublisher:
ISBN:
Category :
Languages : en
Pages : 204
Book Description
Mechanical Properties and Fractography Analysis of Particulate Silicon Carbide Reinforced Reaction Bonded Silicon Nitride Composites
Author: Hsien-Liang KerThermal Effects on the Mechanical Properties of SiC Fiber Reinforced Reaction Bonded Silicon Nitride Matrix (SiC/RBSN) Composites
Author: R. T. BhattPublisher:
ISBN:
Category :
Languages : en
Pages : 20
Book Description
The elevated temperature four-point flexural strength and the room temperature tensile and flexural strength properties after thermal shock were measured for ceramic composites consisting of 30 vol % uniaxially aligned 142 microns diameter SiC fibers in a reaction bonded Si3N4 matrix. The elevated temperature strengths were measured after 15 min of exposure in air at temperatures to 1400 C. The thermal shock treatment was accomplished by heating the composite in air for 15 min at temperatures to 1200 C and then quenching in water at 25 C. The results indicate no significant loss in strength properties either at temperature or after thermal shock when compared with the strength data for composites in the as-fabricated condition. (jes).
Oxidation Effects on the Mechanical Properties of SiC Fiber-Reinforced Reaction-bonded Silicon Nitride Matrix Composites
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722469405
Category :
Languages : en
Pages : 40
Book Description
The room temperature mechanical properties of SiC fiber reinforced reaction bonded silicon nitride composites were measured after 100 hrs exposure at temperatures to 1400 C in nitrogen and oxygen environments. The composites consisted of approx. 30 vol percent uniaxially aligned 142 micron diameter SiC fibers in a reaction bonded Si3N4 matrix. The results indicate that composites heat treated in a nitrogen environment at temperatures to 1400 C showed deformation and fracture behavior equivalent to that of the as-fabricated composites. Also, the composites heat treated in an oxidizing environment beyond 400 C yielded significantly lower tensile strength values. Specifically in the temperature range from 600 to 1000 C, composites retained approx. 40 percent of their as-fabricated strength, and those heat treated in the temperatures from 1200 to 1400 C retained 70 percent. Nonetheless, for all oxygen heat treatment conditions, composite specimens displayed strain capability beyond the matrix fracture stress; a typical behavior of a tough composite. Bhatt, Ramakrishna T. Glenn Research Center RTOP 510-01-0A...
15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2, Volume 12, Issue 7/8
Author: John B. WachtmanPublisher: John Wiley & Sons
ISBN: 0470315881
Category : Technology & Engineering
Languages : en
Pages : 682
Book Description
This volume is part of the Ceramic Engineering and Science Proceeding (CESP) series. This series contains a collection of papers dealing with issues in both traditional ceramics (i.e., glass, whitewares, refractories, and porcelain enamel) and advanced ceramics. Topics covered in the area of advanced ceramic include bioceramics, nanomaterials, composites, solid oxide fuel cells, mechanical properties and structural design, advanced ceramic coatings, ceramic armor, porous ceramics, and more.
Effects of Interface Coating and Nitride Enhancing Additive on Properites of Hi-Nicalon SiC Fiber Reinforced Reaction-bonded Silicon Nitride Composites
Author: Ramakrishna T. BhattPublisher:
ISBN:
Category : Additives
Languages : en
Pages : 24
Book Description
Strong and tough Hi-Nicalon SiC fiber reinforced reaction-bonded silicon nitride matirix composites (SiC/RBSN) have been fabricated by the fiber lay-up approach. Commercially available uncoated and PBN, PBN/Si-rich PBN, and BN/SiC coated SiC Hi-Nicalon fiber tows were used as reinforcement. The composites contained ~24 vol % of aligned 14 ♯m diameter SiC fibers in a porous RBSN matrix. Both one- and two-dimensional composites were characterized. The effects of interface coating composition, and the nitridation enhancing additive, NiO, on the room temperature physical, tensile, and interfacial shear strenght properties of SiC/RBSN matrix composites were evaluated. Results indicate that all three coated fibers, the thickness of the coating decreased from the outer periphery to the interior of the tows, and that from 10 to 30 percent of the fibers were not covered with the interface coating.
High-Temperature Tensile Properties of Fiber Reinforced Reaction Bonded Silicon Nitride
Author: DA. JablonskiPublisher:
ISBN:
Category : Ceramic
Languages : en
Pages : 8
Book Description
A testing technique has been developed for measuring the tensile properties of ceramic matrix composite laminates at temperatures up to 1500°C in air. Using this technique, the tensile properties of unidirectional silicon carbide (SiC) fiber reinforced reaction bonded silicon nitride (SiC/RBSN) composite specimens were measured at 25, 1300, and 1500°C. The composite consists of nearly 30 vol % of aligned 142 μm, chemically vapor deposited SiC fibers (Textron SCS-6). The specimens used were straight section flat specimens with bonded end tabs. A specially designed gripping system was used to minimize bending moment and assured that failure always occurred in the gage section. The specimen extension was measured using a high-temperature capacitive extensometer.
ספר חידושי הרשב״א
Author: סולומון בן אברהם אדרתPublisher:
ISBN:
Category : Talmud
Languages : en
Pages : 100
Book Description
Scientific and Technical Aerospace Reports
Author: PROCESSING AND PROPERTIES OF SILICON CARBIDE WHISKER REINFORCED SILICON NITRIDE CERAMIC MATRIX COMPOSITES (SILICON CARBIDE WHISKER REINFORCED, SILICON NITRIDE).
Author: STEPHEN DOUGLAS NUNNPublisher:
ISBN:
Category :
Languages : en
Pages : 368
Book Description
MgAl\sb2Si\sb4O\sb6N\sb4$, and the matrix and reinforcing phases. The fracture toughness appeared to be controlled by the ability of cracks to propagate along the intergranular phase.
Author: