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A first member is retained to a second member to resist separation in a first direction. A joint comprises a first recess in the first member. The first member comprises at least a ceramic matrix composite (CMC) substrate. The joint comprises at least one ceramic key partially accommodated in the fi

A first member is retained to a second member to resist separation in a first direction. A joint comprises a first recess in the first member. The first member comprises at least a ceramic matrix composite (CMC) substrate. The joint comprises at least one ceramic key partially accommodated in the first recess and engaging the second member. The second member comprises at least a metallic substrate.

대표청구항 ▼

1. A joint retaining a first member to a second member to resist separation in a first direction, the joint comprising: a first recess in the first member, the first member comprising at least a fiber-reinforced ceramic matrix composite (CMC) substrate; andat least one ceramic key partially accommod

1. A joint retaining a first member to a second member to resist separation in a first direction, the joint comprising: a first recess in the first member, the first member comprising at least a fiber-reinforced ceramic matrix composite (CMC) substrate; andat least one ceramic key partially accommodated in the first recess and engaging the second member to resist said separation, the second member comprising at least a metallic substrate, wherein:the first member is a small exit duct (SED) of a reverse flow combustor and the joint is proximate a leading edge of the SED;the first member and the second member encircle an axis;there are a circumferential array of said first recesses;there are a circumferential array of said ceramic keys, each partially accommodated in a respective associated said first recess;said ceramic keys radially position the second member relative to the first member; andsaid ceramic keys are spring biased into engagement with the associated recesses. 2. The joint of claim 1 wherein: a circumferential array of second recesses in the second member; andeach of said ceramic keys is partially accommodated in a respective associated said second recess. 3. The joint of claim 2 further comprising: a spring in each second recess providing said spring bias biasing the associated key into the associated first recess. 4. The joint of claim 3, wherein: the joint is annular; andeach spring radially biases the associated key. 5. The joint of claim 1 wherein: the first member locally encircles the second member at the joint. 6. The joint of claim 5 wherein: the first member is radially retained to the second member at the joint only via hoop stress of the first member. 7. The joint of claim 1 wherein: the keys hold the second member spaced-apart from the first member. 8. The joint of claim 1 wherein: the first member consists of the CMC substrate; andthe second member consists essentially of a nickel-based superalloy. 9. The joint of claim 1 wherein: the first member comprises a coating on the CMC substrate; andthe first recess is within the coating, but not the substrate. 10. The joint of claim 1 wherein: the key comprises silicon nitride or silicon carbide. 11. The joint of claim 1 wherein: each key comprises a spherical surface portion in the associated first recess. 12. A method for manufacturing the joint of claim 1, the method comprising: forming the first recesses by abrasive ball milling. 13. The method of claim 12 further comprising: securing the keys via a ceramic adhesive. 14. The joint of claim 1 wherein: each said first recess receives only a single said key. 15. The joint of claim 1 wherein: each ceramic key is secured in the associated first recess. 16. The joint of claim 1, wherein: each ceramic key is secured in the associated first recess by a ceramic adhesive. 17. The joint of claim 1, wherein: each ceramic key has at least one machined facet. 18. The joint of claim 17, wherein: the machined facet contacts the second member. 19. The joint of claim 1 wherein: the first member is annular. 20. The joint of claim 1 wherein: the first member is radially retained to the second member at the joint at least partially via hoop stress of the first member. 21. The joint of claim 1 wherein: there is a radial gap between the first member and the second member; andeach ceramic key spans the radial gap. 22. The joint of claim 1 wherein: each ceramic key exerts a radial force on the CMC substrate responsive to axial force tending to separate the first member from the second member in the first direction. 23. A joint retaining a first member to a second member to resist separation in a first direction, the joint comprising: a first recess in the first member, the first member comprising at least a fiber-reinforced ceramic matrix composite (CMC) substrate; andat least one ceramic key partially accommodated in the first recess and engaging the second member to resist said separation, the second member comprising at least a metallic substrate, wherein: the first member is a main body of a can-type combustor and the joint is along an outboard face of the main body;the first member and the second member encircle an axis;there are a circumferential array of said first recesses;there are a circumferential array of said ceramic keys, each partially accommodated in a respective associated said first recess;said ceramic keys radially position the second member relative to the first member; andsaid ceramic keys are spring biased into engagement with the associated recesses.