Open Access Research Article Issue
Slip casting and pressureless sintering of Ti3AlC2
Journal of Advanced Ceramics 2019, 8 (3): 367-376
Published: 03 August 2019

Slip casting and subsequent pressureless sintering (PLS) allow the preparation of complex-shaped and large-sized Ti3AlC2 components for many potential applications. The behaviors of the suspensions, green compacts, and sintered samples of Ti3AlC2 were studied in this paper. The optimized condition of 1 wt% of arabic gum as dispersant at pH = 10 results in a Ti3AlC2 suspension for slip casting Ti3AlC2 green compacts without macro defects or cracks. The sintering temperature and Al4C3 embedding powder are found to dominate the properties of the sintered Ti3AlC2 samples. The Ti3AlC2 sample sintered at 1450 ℃ for 1.5 h with Al4C3 embedding powder reaches the best properties, namely 95.3% relative density, hardness of 4.18 GPa, thermal conductivity of 29.11 W·m-1·K-1, and electrical resistivity of 0.39 μΩ·m. The findings in this work may pave the way for the application of MAX phases with large size and complex shape.

Open Access Research Article Issue
Preparation and arc erosion properties of Ag/Ti2SnC composites under electric arc discharging
Journal of Advanced Ceramics 2019, 8 (1): 90-101
Published: 13 March 2019

New Ag/Ti2SnC (Ag/TSC) composites with uniform microstructure were prepared by powder metallurgy. The superior wettability between Ag and Ti2SnC was confirmed with a contact angle of 14°. Arc erosion properties of Ag/10wt%Ti2SnC (Ag/10TSC) and Ag/20wt%Ti2SnC (Ag/ 20TSC) contacts were investigated under 400 V/100 A/AC-3 and compared with Ag/CdO contact. The Ag/10TSC contact exhibited comparable arc erosion property to Ag/CdO contact. The fine arc erosion resistance was attributed to the good wettability between Ti2SnC and Ag, the good heat-conducting property of Ag/10TSC, and the slight decomposition of Ti2SnC that absorbed part of electric arc energy. The excessive Ti2SnC significantly decreased the thermal conducting property of the Ag/20TSC composite, resulting in the severe heat accumulation that decomposed Ti2SnC and deteriorated arc erosion property. The oxidation behavior of Ti2SnC under high electric arc temperature was also studied and then an arc erosion mechanism was proposed to get a comprehensive understanding on the arc erosion property of Ag/TSC composites.

Open Access Research Article Issue
Synthesis and formation mechanism of titanium lead carbide
Journal of Advanced Ceramics 2018, 7 (2): 178-183
Published: 17 April 2018

Ti2PbC was synthesized for the first time by pressureless reaction synthesis using Ti/Pb/TiC as starting materials at a heating rate of 2 ℃/min and holding at 1370 ℃ for 2 h in a tube furnace protected by Ar atmosphere. The effects of starting powders, heating rates, and holding temperatures on the formation of Ti2PbC were investigated. It was found that elementary mixture of Ti/Pb/C or higher heating rates fail to form Ti2PbC. The decreased lattice parameters in the synthesized Ti2PbC indicated the existence of Pb vacancies in the compound. A reaction mechanism was proposed to explain the formation of Ti2PbC.

total 3