Abstract
In this overview, the results published to date concerning the development, processing, microstructure characteristics, and properties of silicon nitride/carbon nanotube (Si3N4 + CNTs) composites are summarized. The influence of the different processing routes on the microstructure development of the Si3N4 + CNTs is discussed. The effects of the CNTs addition on the mechanical properties—hardness, bending strength and fracture toughness—and tribological characteristics—wear rate and coefficient of friction—are summarized. The characteristic defects, fracture origins, toughening and damage mechanisms occurring during the testing are described. The influence of the CNTs’ addition on the thermal and functional properties of the composites is discussed as well. New trends in the development of these composites with significant potential for future applications are outlined.
Highlights
In 1859, the synthesis of Si3 N4 was reported for the first time by Sainte-Claire Deville and Wohler [1]
This incomplete α to β transformation is due the silicon nitride composite reinforced with Carbon Nanotubes (CNTs) by using hot isostatic pressing and studied the to the low temperature, lower holding time and applied pressure [49]
The results published to date concerning the development, processing, microstructure characteristics and properties of silicon nitride/carbon nanotubes composites are summarized
Summary
In 1859, the synthesis of Si3 N4 was reported for the first time by Sainte-Claire Deville and Wohler [1]. Electrical or tribological properties of densified ceramics, different ceramic composites have been developed with the addition of CNTs and graphene [13,14,15,16,17,18]. The aim of these investigations was to develop ceramic-based composites with improved fracture toughness, increased thermal and electrical conductivity and increased thermal shock resistance and wear characteristics. In addition to the positive influence, the sintering additives have a negative aspect as well; they segregate at the grain boundaries and have a negative effect on the high-temperature mechanical properties
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