Microstructure and mechanical properties of 8YSZ ceramics by liquid-phase sintering with CuO-TiO2 addition

In this work, a titanium–tantalum carbonitride based cermet, with cobalt as the binder phase and boron as a sintering additive, was developed by a mechanically induced self-sustaining reaction process using two different methodologies. The boron additive was added to prevent the formation of brittle intermetallic compounds generally formed during the liquid phase sintering step due to the excessive ceramic dissolution into the molten binder phase. A systematic study was carried out to understand the effects of boron addition on the nature of the phases, microstructure, and mechanical properties of cermets. With the boron addition, the formation of two different boride solid solutions, i.e., (Ti,Ta)B2 and (Ti,Ta)3B4, was observed. Moreover, the nature of the binder was also modified, from the (Ti,Ta)Co2 brittle intermetallic compound (for cermets without boron addition) to ductile and tough (Ti,Ta)Co3 and α-Co phases (for cermets with boron addition). These modifications caused, as a general trend, the increase of hardness and toughness in cermets.

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Microstructure and mechanical properties of Ti(C,N)-based cermets fabricated by in situ carbothermal reduction of TiO2 and subsequent liquid phase sintering

Ceramics International ◽

10.1016/j.ceramint.2017.11.074 ◽

2018 ◽

Vol 44 (3) ◽

pp. 3092-3098 ◽

Cited By ~ 10

Author(s):

Guotao Zhang ◽

Yong Zheng ◽

Wei Zhou ◽

Yijie Zhao ◽

Jiajie Zhang ◽

...

Keyword(s):

Mechanical Properties ◽

Liquid Phase ◽

Carbothermal Reduction ◽

Liquid Phase Sintering ◽

Microstructure And Mechanical Properties

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Microstructure and Mechanical Properties of 2D Tyranno SA/SiC Composites by Hot Pressing

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.353-358.1489 ◽

2007 ◽

Vol 353-358 ◽

pp. 1489-1492

Author(s):

Shao Ming Dong ◽

Yu Sheng Ding ◽

Qing Zhou ◽

Akira Kohyama

Keyword(s):

Mechanical Properties ◽

Elastic Modulus ◽

Liquid Phase ◽

Hot Pressing ◽

Sintering Temperature ◽

Liquid Phase Sintering ◽

Preparation Conditions ◽

Microstructure And Mechanical Properties ◽

Carbon Coated ◽

Sic Composites

SiC/SiC composites were fabricated by hot pressing (HP) via liquid phase sintering (LPS) using carbon coated 2D woven Tyranno SA fabrics as reinforcement. Both nano-SiC and micro-SiC powders with sintering additives were used for matrix. The effects of preparation conditions on the microstructure and mechanical properties of the composites were characterized. Highly densified composite was obtained at 1780°C under 20MPa with nano-SiC particles. The strength and elastic modulus of the composite were enhanced. When micro-SiC powder was used, higher strength revealed for the composite sintered at 1780°C under 15MPa, although it was not densified enough. Higher sintering temperature (1800°C) is beneficial for the densification of the composite, but is not obvious for the improvement of mechanical properties.

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