Defense Intelligence Reference Document Materials For Advanced Aerospace Platforms

Defense Intelligence Agency · 27 pages · text from the file's own layer

This Defense Intelligence Reference Document from the Defense Intelligence Agency, dated 12 January 2010, is one of a series of advanced technology reports produced in FY 2009 under the Advanced Aerospace Weapon System Applications (AAWSA) program. It reviews materials for launch vehicles, space vehicles and reusable rocket engines, including aluminum alloys, polymer and metal matrix composites, titanium and nickel alloys, ceramics and titanium aluminides. It concludes that newer materials and design methods offer many ways to improve structural efficiency and cost compared with the space shuttle.

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“Life”5 pages

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p. 8 …A disadvantage of a pre-preg whose matrix is a thermoset is limited shelf life. In…
p. 17 …by the hard, reinforcing phases shortens tool life. Most of the AMCs produced to date have…
p. 22 …thermal strains and improves the thermal fatigue life. Invar is so named because it uses the…
p. 24 …reduced toughness as a function of service life. Nevertheless, CMCs are the material class that holds…

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Figure 4 shows an example of a TI matrix composite (TMC) cross section.
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Figure 4. Cross-Section Micrograph of a Ti Matrix Composite. Small, dark centers
of fibers are C monofilament substrates for deposition of SiC (light micrograph).
Material system: Matrix alloy - Ti-6242; Fiber - SiC about 5.6-mil-diameter SCS-6
Table 2 shows that the strength and stiffness properties of TMCs can exceed those of
the Ti matrix (or other a+/3 Ti alloys) by more than a factor of two with no increase in
density. So why are TMCs not in widespread use? The foremost reason is cost. Another
reason is the availability of SiC fiber for TM Cs.
• During the 1990s, when the U.S. government (mainly DoD) was interested in and
provided development money for TMC R&D, the most attractive reinforcing fiber was
SCS-6Tr,1, which was produced exclusively by Textron Specialty Materials (TSM) in
Lowell, MA.
• Unfortunately (at least in hindsight), TSM made a business decision not to sell fiber
and to instead forward-integrate and sell TMC components or finished TMC mill
products. This decision stemmed in part from TSM's negative business experience
with development of B-based fiber (Boro-SiC™) for first-generation TMCs.
• Prior to making this business decision, TSM did not develop sufficient TMC-
manufacturing expertise to properly position itself as a producer of TMC products
with consistent properties.
15
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Report, from the dia collection. The PDF is mirrored here; the original link is under it. 27 pages are in the text index: search them above, or from the library's search.