Synthesis, Characterization, and Microstructure of ZrC/SiC Composite Ceramics via Liquid Precursor Conversion Method

Abstract

The ceramic precursor for ZrC/SiC was prepared via solution‐based processing using polyzirconoxane, polycarbosilane, and divinylbenzene. The precursor could be transformed into ZrC/SiC ceramic powders at relative low temperature (1500°C). The cross‐linking process of precursor was studied by FT–IR. The conversion from precursor into ceramic was investigated by TGA, XRD. The ceramic compositions and microstructures were identified by element analysis, Raman spectra, SEM, and corresponding EDS. The results indicated that the ceramic samples remained amorphous below 1000°C and t–ZrO2 initially generated at 1200°C. Further heating to 1400°C led to the formation of ZrC and SiC with the phase transformation of ZrO2 and almost pure ZrC/SiC could be obtained upon heat‐treatment at 1500°C. During heat treatments, the ceramic sample changed from compact to porous due to carbothermal reduction. The ceramic powders with particle size of 100 nm~400 nm consisted of high crystalline degree ZrC and SiC phases, and Zr, Si, C were well distributed at the different sites in ceramic powders. The free carbon content was lowered to 1.60 wt% in final ZrC/SiC composite ceramics.

Preparation of carbon/carbon‐ultra high temperature ceramics composites with ultra high temperature ceramics coating

“…A liquid ZrC/SiC precursor (Institute of Chemistry, Chinese Academy of Science, Beijing, China) with weight ratio of Zr to Si being 4:1 was used as ceramic precursor. Details of the 2 components liquid precursor have been reported elsewhere . The C/C–ZrC–SiC composites were densified by repeatedly vacuum infiltration with the above‐mentioned liquid precursor into the low density C/C composites, drying, and heat treatment at 1500°C for 5 hours under an argon protective atmosphere.…”

Polymer precursor‐derived HfC–SiC ultrahigh‐temperature ceramic nanocomposites

“…Commonly, HfC has to be synthesized by inorganic sintering because no resource is present in the natural world. Furthermore, in consideration of the poor anti‐oxidation of single HfC ceramics under extreme surroundings, many studies seek original methods for improving, even solving the backdraw inhibiting its widespread applicaitons, therefore, silicon cabide (SiC) is usually introduced to fabricate binary MC‐SiC(M=Ti, Zr, Hf) due to its demonstrated good oxidation resistance …”

“…However, in several limited studies it is reported that the compositions of Hf‐containing products are complicated, such as HfN x and HfC x N 1− x , and exist in the obtained products . The polymeric precursor as an alternative method for preparing nanoscale ceramic powders has drawn much attention recently . Importantly, the ratio of M/Si (M = Zr, Hf and Ti) can be modulated in a large scale, which is advantaged to obtain ceramics with modulatable M and Si content.…”

Solid oxide membrane-assisted controllable electrolytic fabrication of metal carbides in molten salt

“…particular, nanostructured MCs materials hold promise for various applications due to their interesting properties. [12][13][14][15][16][17][18][19] While the high melting points of MCs are useful for high-temperature applications, they also cause problems when preparing these MCs materials. 6 In addition, MCs ceramics such as tantalum carbide (TaC) and zirconium carbide (ZrC) generally possess high melting points and thus have the potential to be used for extremely high-temperature applications.…”