Ceramic matrix composite fastener

{
  "publication_number": "US12163547B2",
  "country": "US",
  "kind": "B2",
  "title": "Ceramic matrix composite fastener",
  "abstract": "A method of forming a ceramic matrix composite (CMC) fastener, the method comprising: shaping a preform to form a green fastener; applying one or more layers to an outer surface of the green fastener to form a layered green fastener; and finishing the layered green fastener to form the CMC fastener.",
  "claims": [
    "1. A method of forming a ceramic matrix composite (CMC) fastener, the method comprising: rolling a base material to form a preform; shaping the preform to form a green fastener; applying one or more layers to an outer surface of the green fastener to form a layered green fastener, wherein the layered green fastener includes a body including a rolled inner section and an outer section, the rolled inner section including a central opening extending along a longitudinal direction and the outer section including the one or more layers; and finishing the layered green fastener to form the CMC fastener.",
    "2. The method of claim 1, wherein the one or more layers and the base material comprise a same material.",
    "3. The method of claim 1, wherein the base material comprises a prepreg CMC tape, and the method further comprises rolling the prepreg CMC tape to form the preform.",
    "4. The method of claim 1, wherein the preform comprises SiC/SiC, C/SiC, or oxide/oxide.",
    "5. The method of claim 1, wherein shaping the preform is performed by compressing the preform with a shaped tool.",
    "6. The method of claim 1, wherein applying the one or more layers to the outer surface of the green fastener comprises wrapping one or more plies to the outer surface of the green fastener.",
    "7. The method of claim 6, wherein wrapping is performed by reorienting adjacent layers of the one or more plies by an interlayer angular offset in a range of 45° and 90°.",
    "8. The method of claim 1, wherein finishing the layered green fastener comprises compacting the layered green fastener.",
    "9. The method of claim 1, further comprising: forming a first engagement portion at a first end of the green fastener; and forming a second engagement portion at a second end of the green fastener, each of the first and second engagement portions being selected from a tapered portion and a threaded portion."
  ],
  "description_excerpt": "The present subject matter relates generally to ceramic matrix composite (CMC) fasteners, and more particularly to CMC fasteners having improved strength.\n\nMany components on high speed aviation equipment are formed from CMC bodies. Exemplary components include shrouds, leading edges, nozzles, and combustor liners. At supersonic, and more particularly at hypersonic speeds, these components can exceed temperatures well in excess of 1700° F., such as 4000° F. and higher.\n\nTraditionally, these CMC components are secured together and to other components of the high speed aviation equipment through metallic hardware. However, for high speed applications (particularly at hypersonic speeds), temperatures are above safe operating conditions for metal hardware.\n\nAccordingly, industries with components subjected to high operating temperature environments continue to demand improvements to fasteners and associated methods for attaching CMC and related components together while permitting use at high operating temperatures and extreme operating conditions.\n\nAspects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.\n\nIn one exemplary embodiment of the present disclosure, a method of forming a ceramic matrix composite (CMC) fastener, the method comprising: shaping a preform to form a green fastener; applying one or more layers to an outer surface of the green fastener to form a layered green fastener; and finishing the layered green fastener to form the CMC fastener.",
  "cpc": [
    "F16B 33/006",
    "B28B 19/0015",
    "C04B 35/01",
    "C04B 35/565",
    "C04B 35/80",
    "F16B 25/0094",
    "F16B 5/02"
  ],
  "ipc": [
    "B28B 23/02",
    "F16B 33/00"
  ],
  "assignees": [
    "General Electric Co"
  ],
  "inventors": [
    "Michael James Verrilli"
  ],
  "filing_date": "2021-03-18",
  "publication_date": "2024-12-10",
  "grant_date": "2024-12-10",
  "priority_date": "2021-03-18",
  "application_number": "US-202117205047-A",
  "family_id": "83285495",
  "cited_by_count": 0,
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}