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Fasteners made of composite material of a ceramic matrix reinforced with refractory fibers
| Details |
Inventors: His, Sylvie; Lequertier, Jean-Michel;
Assignee: Societe Nationale Industrielle et Aerospatiale (Paris Cedex, FR)
Primary Examiner: Wilson; Neill R.
Assistant Examiner:
Attorney, Agent or Firm: Sandler, Greenblum & Bernstein
Fasteners composed of a composite material constituted by a ceramic matrix reinforced with refractory fibers for use in the assembling and dissembling of structures likely to be subjected to high temperatures. The fasteners, which can comprise screws, nuts and bolts, can include a threaded rod, possibly comprising a head, and at least one nut cooperating with the rod. The threads of the rod and the nut are round threads. Further, the male and female portions of the threads have the same theoretical profile to within machining tolerance and functional clearance. |
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DETAILED DESCRIPTION The object of the present invention is to embody screws, nuts and bolts made of a reinforced ceramic material able to withstand mechanical stresses in temperature conditions possibly reaching or exceeding 1200.
degree.
C.
To this end, the invention concerns screws, nuts and bolts made of a composite material constituted by a ceramic matrix reinforced with refractory fibers, and including firstly a threaded rod possibly comprising a head, and secondly one or several nuts cooperating with the rod, wherein the threads of the rod and the nuts are round threads.
More specifically, with regard to the threads, the male and female portions having the same theoretical profile to within machining tolerance and functional clearance.
These screws, nuts and bolts preferably also satisfy the following condition: 0.
03.
ltoreq.
r/D.
ltoreq.
0.
07, in which r is the radius of the root of the thread and the radius of the crest of the thread and D is the external diameter of the threaded rod.
The rod threads preferably have an angle .
alpha.
of between 30 and 100 degrees.
This threaded profile proves to be remarkably adapted to the nature of the reinforced ceramic materials described above because the assembling members fabricated from these materials have excellent tensile strength, able to exceed 200 MPa.
This is especially the situation when using a SiC.
sub.
W /SiAlYON type reinforced ceramic as a material.
Similarly, shearing tests on these materials have demonstrated a resistance to rupture exceeding 160 MPa.
These screws, nuts and bolts are intended in particular for the assembling of plates, especially carbon--carbon plates, whether or not protected against oxidation.
Generally speaking, the screws, nuts and bolts of the invention shall be used in conjunction with spacers that fit between firstly the head and/or the nut(s), and secondly the set of plates to be assembled.
The spacers have a spherical bearing surface and are included to provide mechanical strength by eliminating harmful parasitic bendings and also to provide reliability of the assembling
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Metal Working 
