Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.463h&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Other
Scientific paper
Functionally Graded Material (FGM) is a new kind of nonhomogeneous materials, which composition varies gradually and continuously from metals to ceramics, thus excellence of both ceramic and metal is brought fully into play. The impetus for the development of FGM was to make thermal barrier materials for space shuttles and structure such as combustion chamber, gas vane, air vane, nose cone, fuel valve sheets and piston crown. There are several main techniques for making FGMs including chemical vapor deposition (CVD), powder metallurgy, plasma spraying and self-propagating high temperate synthesis (SHS). SHS Technology is the process by which condensed phases are produced by self - sustaining exothermic chemical reaction. Demonstrated advantages of SHS as a method for the preparation of materials include higher purity of the products, low energy requirements, and the relative simplicity of the process. SHS is particularly well suited to fabricating FGM. Due to the rapidity of the combustion reaction, the initial arrangement of the constituent in the green body is unchanged during combustion. In this paper, TiB2-Cu FGM and homogeneous cermets have been prepared by combing forced compaction with SHS. The experimental results show that process parameters significantly influence the combustion synthesis procedure of Ti-B-Cu system. Optimal process parameters have been gained for preparing TiB2-Cu FGM and cermets. TiB2-Cu FGM by SHS has a continuous distribution in microstructure along its thickness. The macroscopic interface of ceramic/metal joint is elemented. Mechanical properties of TiB2-Cu cermets were investigated at room and high temperature. The thermal stress of TiC-Ni FGM prepared by SHS are simulated at working condition, as well as comparing with a layered TiB2-Cu Non- FGM. Obviously, the TiB2-Cu FGM has the function of distortion and thermal stress relation. TiB2-Cu FGM was tested in the limited wind tunnel simulating the real condition of the heat flux rocket engine. As a result, TiB2-Cu FGM showed excellent resistant ablating properties. There is only a little loss of the mass after heated for 40 seconds in the wind tunnel. Meanwhile no cracks and breakup appeared in the FGM under the sharp thermal shock condition. Key words: functionally graded materials, combustion synthesis, ablation, thermal shock, thermal stress
Han Jiecai
He Xiaodong
Zhang Xinghong
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