Handling and Green Forming of Fine Powders
In its early stages of evolution, ceramic powder processing was entirely based on the use of natural minerals such as clay, flint and feldspar as starting materials. These materials were chosen not only because of their chemical compositions but also due to their physical characteristics. The introduction of synthetic starting powders such as alumina and the gradual evolution to materials made entirely of synthetic raw materials has required the development of a processing technology consistent with their physical characteristics. The technology for producing submicron, high purity oxide and nonoxide powders has been developing at a rapid pace in recent years and can be expected to continue. In order to take full advantage of these developments, processing science and technology for these advanced powders must also be developed. An important part of the required technology is the development of processing techniques for working with powders having bulk densities below 10 percent of theoretical without unacceptable chemical or tramp-particle contamination. Such techniques must be capable of producing materials with optimum microstructures that are free from singularities that limit mechanical and other properties.
KeywordsFine Powder Advanced Ceramic Compaction Behavior Green Form Agglomerate Structure
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