Synthesis of ZrC–SiC Powders by a Preceramic Solution Route

Abstract

Homogenous liquid precursor for ZrC–SiC was prepared by blending of Zr(OC4H9)4 and Poly[(methylsilylene)acetylene]. This precursor could be cured at 250°C and converted into binary ZrC–SiC composite ceramics upon heat treatment at 1700°C. The pyrolysis mechanism and optimal molar ratio of the precursor were investigated by XRD. The morphology and elements analyses were conducted by SEM and corresponding energy‐dispersive spectrometer. The evolution of carbon during ceramization was studied by Raman spectroscopy. The results showed that the precursor samples heat treated at 900°C consisted of t‐ZrO2 (main phase) and m‐ZrO2 (minor phase). The higher temperature induced phase transformation and t‐ZrO2 converted into m‐ZrO2. Further heating led to the formation of ZrC and SiC due to the carbothermal reduction, and the ceramic sample changed from compact to porous due to the generation of carbon oxides. With the increasing molar ratios of C/Zr, the residual oxides in 1700°C ceramic samples converted into ZrC and almost pure ZrC–SiC composite ceramics could be obtained in ZS‐3 sample. The Zr, Si, and C elements were well distributed in the obtained ceramics powders and particles with a distribution of 100 ~ 300 nm consisted of well‐crystallized ZrC and SiC phases.

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 …”

Syntheses of ZrC–SiC nanopowder via sol–gel method

“…In solution based protocols, soluble zirconium-and silicon-containing precursors are mixed, cured and pyrolyzed to form ZrC-SiC composite powders based on the carbothermal reduction. However, it is difficult to control the composition in the ZrSi-C ternary system when silicon-containing polymer is used as silicon source [19][20][21].…”

Zirconium carbide, hafnium carbide and their ternary carbide nanoparticles by an in situ polymerization route

“…For instance, the thermal and electronic conductivities can be at the metallic level. [8][9][10][11][12] As an analogy to ZrC, HfC has the highest melting point (3890 C), low oxygen diffusion coefficient, and high phase stability, which make HfC-based composites of high interest for aerospace applications. 6,7 Among these carbides, zirconium carbide (ZrC) has a high melting point and excellent corrosion resistance, and in addition, low cost and broad availability, and its chemistry and characteristics have been greatly studied.…”