Si‐rich pressureless sintering of the gelcasted Ti3SiC2 bulk ceramic. Issue 5 (27th February 2021)

• Record Type: Journal Article
• Authors: Zhao, Zhanchong; Li, Xianhui; Zeng, Xian; Liu, Huayan; Zhang, Yong; Zhang, Xiaoxin; Yan, Qingzhi
• Is Part Of: International journal of applied ceramic technology. Volume 18:Issue 5(2021)
• Page Start: 1542
• Page End: 1552
• Publication Date: 2021-02-27
• Subjects: gelcasting -- mechanical properties -- Si‐rich pressureless sintering -- Ti3SiC2 ceramics; Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.13722
• Languages: English
• ISSNs: 1546-542X

Abstract

Abstract: The Si‐rich pressureless sintering was used to fabricate the Ti3 SiC2 bulk ceramic. The results show that the optimized Ti3 SiC2 suspension could be prepared at the absolute value of zeta potential, pH level, PAA‐NH4 dosage, and solid loading of 62.1 mV, 11, 2.0 wt%, and 50 vol%, respectively. The channels existing in the Si‐free sintered body facilitated the reactants and products to diffuse to the interior and out of the Ti3 SiC2 matrix, thereby forming the porous reaction layer of TiC‐Ti3 SiC2 . The co‐effects of the channels and the reaction layer of TiC‐Ti3 SiC2 severely lowered mechanical properties of the Si‐free sintered Ti3 SiC2 ceramic. On the contrary, the Si‐rich sintering method isolated the volatile carbon and established a closed Si‐rich atmosphere to sinter the green Ti3 SiC2 cylinder. The porosity, density, fracture toughness, hardness, and flexural strength of the Si‐rich sintered Ti3 SiC2 ceramic reached 0.74 vol%, 4.36 g/cm 3, 5.49 MPa·m 1/2, 4.03 GPa, and 383 MPa, respectively.