Process for controlling the microstructural bias of multi-phase

Details Process for controlling the microstructural bias of multi-phase Process for controlling the microstructural bias of multi-phase

1998-04-23

2000-07-18

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Utilizing diverse solid particles

264642, 264649, C04B 3332

Patent

active

06090321&

ABSTRACT:
A process for controlling and thus predicting the microstructural bias of multi-phase composites to obtain preferential positioning of the component compounds in their morphology and position in the resulting microstructure to cause the grains of a first phase either to locate at the grain boundaries of a second phase, or to be homogeneously distributed in the second phase using both conventional manually mixing (MM) and advanced self-propagating high-temperature (SHS) processing technologies. A process whereby a lower cost composite material performs comparably to a more expensive monolithic nature of higher performance material by causing the higher performance first phase grains to preferentially locate at the grain boundaries of the second phase during densification/fusing. A process to optimize the performance properties by preferentially biasing the microstructure to cause the phase which intrinsically has the preferred properties to influence and enhance the desired properties of the bulk composite material.

REFERENCES:
patent: 5637266 (1997-06-01), Lai et al.
patent: 5660599 (1997-08-01), Schlott et al.
patent: 5700418 (1997-12-01), Hormann et al.
patent: 5792403 (1998-08-01), Massa et al.
Keckes, L.J. et al., Dynamic Consolidation of Combustion-Synethsized Alumina-Titanium Diboride Composite Ceramics, J. Am. Ceram. Soc., 79[10]2687-95 (1996).
Logan, K.V., Elastic-Plastic Behavior of Composite TiB2/Al2O3 Produced Using Self-Propagating High Temperature Synthesis, PhD dissertation, Georgia Institute of Technology, Sep. 1992 Figures Only (1-26).

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