Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1988-10-20
1992-12-01
Derrington, James
Metal founding
Process
Shaping liquid metal against a forming surface
164 98, 164105, 264 44, 264 59, B22D 1900
Patent
active
051672715
ABSTRACT:
The present invention relates to processes to produce ceramic reinforced and ceramic-metal matrix composite articles. More specifically, the invention concerns the use of pressure filtration to infiltrate a reinforcing organic or inorganic network with ceramic particles. Centrifugation is also used to separate the liquid form the slurry. After heating the reinforced ceramic article is produced. Pressure filtration is also used to infiltrate an organic polymer or organic fiber network with ceramic particles. The solvent is removed carefully followed by intermediate heating to remove the organic network without deforming the preform shape. After densification, the preform is heated and contacted with molten metal (optionally) with pressure to infiltrate the open channel network. Upon cooling the ceramic metal matrix composite is obtained. The reinforced matrix articles are useful in high temperature and high stress applications, e.g., combustion chambers, space applications, ceramics for bathroom fixture use, and the like. A significant advantage of this process is its ability to manipulate the architecture as well as the amount of metal reinforcement in the composite as per specifications. Moreover, one can choose different metal-ceramic reinforcements as per the processing needs.
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patent: 4461842 (1984-07-01), Jamet
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M. S. Newkirk et al., Journal of Materials Research, vol. 1, No. 1, pp. 81-89, (Jan. Feb., 1986).
J. F. Jamet et al., "Pressure Slip Coasting of Ultrafine Powders A Promising Process for Ceramic-Ceramic Composites", ICAS Proceedings 1986: 15th Congress of International Council of Aeronautical Sciences, #10936, Sep. 7-12, 1986, pp. 553-569.
Evans Anthony G.
Lam David C.
Lange Frederick F.
Mehrabian Robert
Velamakanni Bhaskar V.
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