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Method for forming fiber reinforced composite bodies with graded composition and stress zones
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1999 |
| Description | A near-net, complex shaped ceramic fiber reinforced silicon carbide based composite bodies with graded compositions and stress zones is disclosed. To provide the composite a fiber preform is first fabricated and an interphase is applied by chemical vapor infiltration, sol-gel or polymer processes. This first body is further infiltrated with a polymer mixture containing carbon, and/or silicon carbide, and additional oxide, carbide, or nitride phases forming a second body. One side of the second body is spray coated or infiltrated with slurries containing high thermal expansion and oxidation resistant. crack sealant phases and the other side of this second body is coated with low expansion phase materials to form a third body. This third body consisting of porous carbonaceous matrix surrounding the previously applied interphase materials, is then infiltrated with molten silicon or molten silicon-refractory metal alloys to form a fourth body. The resulting fourth body comprises dense composites consisting of fibers with the desired interphase which are surrounded by silicon carbide and other second phases materials at the outer and inner surfaces comprising material of silicon, germanium, refractory metal suicides, borides, carbides, oxides, and combinations thereof The resulting composite fourth body has different compositional patterns from one side to the other. |
| File Size | 544903 |
| Page Count | 5 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19990108574 |
| Archival Resource Key | ark:/13960/t1sf7q692 |
| Language | English |
| Publisher Date | 1999-08-31 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Sprayed Coatings Patents Refractory Metals Porous Materials Ceramic Fibers Silicon Carbides Fiber Composites Forming Techniques Metal Coatings Metal Oxides Thermal Expansion Reinforcing Materials Reinforcing Fibers Chemical Vapor Infiltration Sol-gel Processes Metal Working Germanium Composite Structures Carbides Slurries Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
