Tape casting of AlN–SiC–MoSi 2 composites

MoSi2 laminate processed by tape casting: Microstructure and mechanical properties' investigation

“…The binder starts to decompose when a certain amount of plasticizer has already been eliminated. This is important since the decomposition process can take place in the best way because the removal of the plasticizer at lower temperature allows an easier elimination of the binder that uses the channels previously formed [55]. Furthermore it is important for the individual organic components to burn out at different temperatures but within a narrow temperature range, in order to avoid disturbing the powdered structure in the tape.…”

“…The beginning of decomposition process of a dry tape is shifted to lower temperature (120 C). According to literature [55,58] it can be attributed to a catalytic effect of inorganic surfaces linked with the capillary-driven transport present in the ceramic green body. Satisfying results were obtained using the debinding treatment schematised in Fig.…”

“…In the case of these materials MoSi 2 is used in order to improve the behaviour of other ceramics according to its intrinsic properties: Sciti and coworkers [54,55] prepared an AlN þ SiC þ MoSi 2 multilayer, where MoSi 2 is a minority phase (up to 30 vol.%) able to tailor electrical conductivity of the overall composite; Watanabe and co-workers [56,57] proposed an Al 2 O 3 /TiC/MoSi 2 þ Mo 2 B 5 multilayer, where MoSi 2 þ Mo 2 B 5 super-plastic layers are stacked in order to toughen Al 2 O 3 at high temperature.…”

Fabrication and residual stresses characterization of novel non-oxide multilayer ceramics

“…The binder (poly-vinyl-butyral PVB, B98, Monsanto, USA) and the plasticizers (polyethylene glycol PEG-400, Merck, Germany and benzyl-butyl-phtalate BBP, S160, Monsanto, USA) were subsequently added, according to the procedure described in ref. 19 . The formulations of the slurries are reported in Table 1.…”

“…Electroconductivity measurements have shown that for MoSi 2 content higher than 25-30 vol.% the composite is electro-conductive with resistivity of the order of 10 −3 cm, whilst for lower MoSi 2 content (10-15 vol.%) the composite resistivity is over 10 2 -10 3 cm. Furthermore, these types of composites have been successfully produced by tape-casting technique 19 which should allow multilayer composites to be easily produced. One interesting application of these materials is in fact as heaters and igniters where, in most of these devices, thin layers In this contribution, homogenous and heterogeneous laminates in the AlN-SiC-MoSi 2 system are produced.…”