Analysis of the potential occurrence features in multicomponent ceramic composites based on the refractory anoxic compounds (part 1)
DOI:
https://doi.org/10.15587/2312-8372.2016.79874Keywords:
binder, hafnium carbide, temperature, rubber, carboxymethylcellulose, concentration, morphology, microstructureAbstract
Formation of the functional zone of multicomponent ceramic composite based on refractory anoxic compounds is the object of research. The disadvantages of this object in the existing operating conditions include high inertia, which shows that the produced functional devices do not affected by sudden changes in temperature peak.
Research was conducted at the Institute for Problems in Material Science of Ukraine using industrial powders. The investigated samples were produced by plastic forming on the spindle stall in the form of plates 100×7×6 mm. Carboxymethylcellulose (CMC) in combination with a plasticizer (glycerol or rubber) was used as a binder for this method. Investigated samples of silicon-nitride composites based on SIALONs were obtained by hot pressing of prepared ceramic tapes using the induction method of the mold heating.
Research was conducted by the methods: chemical analysis of raw materials and samples, X-ray analysis, electron microscopic analysis, X-ray spectral probe microanalysis and quantitative metallographic analysis of microstructure morphology of the ceramic composites.
It was established that the formation of functional areas nonlinear device affect technological factors such as: binder type, temperature, isothermal soaking temperature and composition of the gas environment. Reduction of the isothermal soaking temperature leads to increased non-uniformity of resistance by volume of the functional element with decreasing or exceeding the optimum soaking temperature. Binder, binder composition and gas temperature of the environment significantly affect the anisotropy and dimension of conducting of formed cluster. It is shown that microstructure morphology is formed differently for various binders. It is found that TCR passes through «0» for 13 % concentration of HfC.
These research results can be used to establish the correlation between process parameters, electrical conductivity and Seebeck coefficient of the solid layered multicomponent ceramic composites based on refractory anoxic compounds. Based on these studies it becomes possible to manufacture highly efficient thermoelectric converters.
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