Influences of Cr on Solidification Behavior of TiC-TiB_2 Composite Ceramics Prepared by Combustion Synthesis in High Gravity Field AITranslate

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Chinese Library Classification Number:TQ174.758.22[化学工程—陶瓷工业]

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TiC-TiB2 composite ceramics with different Cr content were prepared by combustion synthesis in high gravity field using Ti+B4C as the primary reactive system assisted by different contents of CrO3+Al as the enhancement system.XRD,FESEM and EDS results show that the prepared composite ceramics are mainly composed of many fine TiB2 platelet grains and TiC spherical grains,and most Cr-rich metal phase intertwines with TiB2 platelet grains.With the content of CrO3+Al increased,system adiabatic temperature rises,and volume fraction of Cr-rich metal phase in TiC-TiB2 composite ceramic increases.It is supposed that Ti-Cr-C-B alloy liquid is the product of combustion reaction in high gravity field.During cooling and solidification of the alloy liquid,TiC nucleates and precipitates at first and then TiB2 precipitates.Finally,Cr and a small amount of unreacted Ti precipitate to fill the shrinkage cavity in the skeletal structure of TiB2 platelet grains and thereby increase the density of TiC-TiB2 composite ceramics.