Effect of silicidation pretreatment with gaseous SiO on sinterability of TiC powders |
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| Affiliation: | 1. School of Metallurgy and Environment, Central South University, Changsha 410083, Hunan, China;2. JiangXi Rare Metals Tungsten Holdings Group Co., Ltd., Nanchang 330046, Jiangxi, China;1. School of Mechanical Engineering, The University of Adelaide, South Australia, Australia;2. GeniCore, Warsaw, Poland;3. School of Engineering, Edith Cowan University WA, Australia |
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| Abstract: | Silicidation pretreatment with gaseous SiO at 1350 °C for 30 min is employed for chemically modifying commercially available TiC powder. Phase composition and microstructural features of the pretreated powder are discussed. Densification behavior of the pretreated TiC powder during hot pressing is studied in comparison with that of non-pretreated one. Significantly improved densification behavior and sinterability of TiC powder after silicidation pretreatment are explained by the effect of Ti3SiC2 acting as a solid lubricant. Nearly fully dense TiC-based ceramics having flexural strength of 370 MPa, fracture toughness of 5.6 MPa m½, and microhardness of 24 GPa is obtained by hot pressing under conditions as mild as 1600 °C and 20 MPa. |
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