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Tensile properties and microstructural characterization of hi-nicalon sic/rbsn composites (Document No: 19980236874)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bhatt, Ramakrishna T. |
| Copyright Year | 1998 |
| Description | The room temperature physical and mechanical properties of silicon carbide fiber-reinforced reaction-bonded silicon nitride matrix composites (SiC/RBSN) were measured, and the composite microstructure was analyzed. The composites consist of nearly 24 vol% of aligned Hi-Nicalon SiC fiber yarns in a approx. 30 vol% porous silicon nitride matrix. The fiber yarns were coated by chemical vapor deposition with a 0.8 mm layer of boron nitride (BN) followed by a 0.2 mm layer of SiC. In the as-fabricated condition, both 1-D and 2-D composites exhibited high strength and graceful failure, and showed improved properties w en compared with unreinforced matrix of comparable density. No indication of reaction between the SiC fiber and BN coating was noticed, but the outer SiC layer reacted locally with the nitridation enhancing additive in the RBSN matrix. A comparison is made between the predicted and measured values of matrix cracking strength. |
| File Size | 860714 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19980236874 |
| Archival Resource Key | ark:/13960/t39072g1n |
| Language | English |
| Publisher Date | 1998-10-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Additives Boron Nitrides Silicon Carbides Fiber Composites Mechanical Properties Coatings Vapor Deposition Silicon Nitrides Yarns High Strength Fracture Strength Microstructure Tensile Properties Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
