Patent ID: 8739547

Claim:
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; and at 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; and said ceramic keys are spring biased into engagement with the associated recesses.