Can I achieve theoretical density for either a silicon nitride or silicon carbide ceramic prepared from Ceraset Polysilazane 20 or Ceraset Polyureasilazane?
Yes. While the bulk density of a cured sample of Ceraset Polysilazane 20 or Ceraset Polyureasilazane which is pyrolyzed at 1,000° C is only around 2 – 2.5 g/cm3 and is manifest as homogeneous porosity throughout the sample, the use of an appropriate sintering aid (either as a reactive chemical or as a particulate powder) will allow for full densification at typical sintering temperatures (ca. 1,700° C for silicon nitride, and above 2,000° C for silicon carbide). Yttria or alumina sintering aids can be used when the final ceramic composition is chosen to be silicon nitride, while conventional boron-containing sintering aids can be used when the final ceramic composition is chosen to be silicon carbide. In either case, a fully dense (3.1-3.2 g/cm3) monolith can be obtained with mechanical properties which are the equivalent to high quality samples prepared using conventional powder consolidation (sintering / densification) techniques.
Related Questions
- Can I achieve theoretical density for either a silicon nitride or silicon carbide ceramic prepared from Ceraset Polysilazane 20 or Ceraset Polyureasilazane?
- What is the density of pyrolyzed Ceraset Polysilazane 20 or Ceraset Polyureasilazane?
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