Synthetic Low-Shrinkage Oxide-Matrices from Filled Polymeric Siloxanes

Suttor, D.; Kleebe, H.-J.; Ziegler, G.

doi:10.1002/9780470294444.ch4

Cited by 3 publications

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“…Despite great improvements in sintering processes for ceramic parts, components for most applications still require finishing. Problems encountered in finishing high performance ceramics are caused precisely by its main attributes, as the high hardness of ceramics rapidly destroys the diamond tools that are used 1 . An alternate way to overcome problems related to machinability in conventional ceramic processing has been the manufacture of complex shaped components from polymer-filler systems, followed by conversion to ceramic material through pyrolysis [2][3][4] . The advantages of this process are the relatively low processing temperatures, the possibility to incorporate fibrous and particulate reinforcement and low processing cost, besides the unique opportunity to make high quality ceramic components using plastic forming technologies [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Complex-shaped ceramic composites obtained by machining compact polymer-filler mixtures

Rocha

Greil²,

Bressiani

et al. 2005

Mat. Res.

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Research in the preparation of ceramics from polymeric precursors is giving rise to increased interest in ceramic technology because it allows the use of several promising polymer forming techniques. In this work ceramic composite pieces were obtained by pyrolysis of a compacted mixture of a polysiloxane resin and alumina/silicon powder. The mixture consists of 60 vol% of the polymer phase and 40 vol% of the filler in a 1:1 ratio for alumina/silicon, which was hot pressed to crosslink the polymer, thus forming a compact body. This green body was trimmed into different geometries and pyrolised in nitrogen atmosphere at temperatures up to 1600 °C. X-ray diffraction analysis indicated the formation of phases such as mullite and Si2ON2 during pyrolysis, that result from reactions between fillers, polymer decomposition products and nitrogen atmosphere. The porosity was found to be less than 20% and the mass loss around 10%. The complex geometry was maintained after pyrolysis and shrinkage was approximately 8%, proving pyrolisis to be a suitable process to form near-net-shaped bulk ceramic components

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