Process for controlling the microstructrual bias of multi-phase composites
a multi-phase composite and microstructure technology, applied in the field of process for controlling and thus predicting can solve the problems of low reliability, inability to predict the microstructure of multi-phase composites, and thus inability to control on a micron scale level, and achieve the effect of high manufacturing reject rate of the final composite product, low reliability, and high manufacturing efficiency
Inactive Publication Date: 2002-01-03
GEORGIA TECH RES CORP
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Benefits of technology
This process enables the production of multi-phase composites with predictable characteristics, such as enhanced resistance to penetration, comparable to high-performance monolithic materials, while reducing manufacturing costs and improving reliability.
Problems solved by technology
At present, when manufacturing multi-phase composites, the multi-phase composite microstructure usually cannot be predicted, and thus cannot be controlled, on a micron scale level.
This is a major cause of low reliability and high manufacturing reject rate of the final composite product.
Also, since most high performance materials are opaque, quality control of the microstructure during or after manufacture by non-destructive evaluation or testing (NDE) is not possible.
Quality control is critical, often meaning the difference between life and death for persons relying on the material used in armor.
Typically, high performance monolithic ceramics are expensive to process because of the extreme processing conditions required due to their intrinsic properties such as high melting points and hardness.
As a result, many high performance monolithic materials are expensive to manufacture.
Method used
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[0039] Referring now in detail to the drawing figures wherein like reference numerals represent like parts throughout the several views, monolithic ceramic materials such as TiB.sub.2, SiC, B.sub.4C and Al.sub.2O.sub.3 exhibit excellent high performance properties. However, synthesis and processing of these ceramics require high temperatures, high pressures and expensive finishing steps. Further, the resultant products have a high reject rate and low reliability, which cause a high manufacturing cost. The present invention discloses a method for combining certain high performance materials with other materials, resulting in multi-phase composites, which have performance characteristics similar to, or better than, the monolithic high performance ceramics, yet are less expensive to manufacture, can be manufactured using lower temperatures and / or pressures, have less expensive finishing steps, have lower reject rates, and have higher reliability. FIG. 1 is a chart of properties of sele...
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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 and advanced self-propagating high-temperature 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.
Description
[0001] 1. Field of the Invention[0002] This invention relates generally to a process for controlling, and thus predicting, the microstructural bias of multi-phase composites. This invention relates specifically to a process for obtaining preferential positioning of the component phases present in the microstructure of multi-phase particulate composite materials. The invention has utility in the production and optimization of the properties of high performance materials.[0003] 2. Prior Art[0004] At present, when manufacturing multi-phase composites, the multi-phase composite microstructure usually cannot be predicted, and thus cannot be controlled, on a micron scale level. This is a major cause of low reliability and high manufacturing reject rate of the final composite product. Also, since most high performance materials are opaque, quality control of the microstructure during or after manufacture by non-destructive evaluation or testing (NDE) is not possible. Quality control is cri...
Claims
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IPC IPC(8): C04B35/117C04B35/645
CPCC04B35/117C04B35/645
InventorLOGAN, KATHRYN V.
OwnerGEORGIA TECH RES CORP