Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1990-03-01
1991-07-30
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264109, 419 66, B29C 4302
Patent
active
050358456
ABSTRACT:
This invention relates to compacts obtained from nonmetallic and metallic powders by die pressing. In particular, it describes an improved method of manufacturing parts from powders where the properties of powders and green compacts can be readily controlled and modified to obtain final products according to desired specifications and dimensions. Introduction of an uniform procedure for determination of powder and green compact properties: slide coefficient, compactibility coefficient and cohesiveness, by a simple compaction test allows to optimize the selection of binders, plasticizers, lubricating substances and the methods of powder preparation prior to pressing operation. With the powder properties known, the pressing parameters can be precisely established and an optimum material and surface treatment for the compacting die can be chosen. With the value of cohesiveness given by the test, the process can be designed to eliminate mechanical defects in compacts such as cracks and laminations.
REFERENCES:
patent: 3255716 (1966-06-01), Knochel et al.
patent: 3499144 (1970-03-01), Juillet et al.
patent: 4100598 (1978-07-01), Stiel et al.
Gasiorek et al., "Mathematical Description of the Process of Compacting Ceramic Powders" Energy & Ceramics, Proceedings of the 4th International Meeting on Modern Ceramics Technologies, Saint-Vincent, Italy May 1979, pp. 223-236.
Van Grenou "Density Variations In Die-Compacted Powders" Science of Ceramics, vol. 10, pp. 93-99, 1979.
KZK Powder Technologies Corporation
Theisen Mary Lynn
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