Microstructure, mechanical properties and machining performance of hot-pressed Al2O3 - ZrO2 - TiC composites

International Conference on Advanced Materials and New Technologies in Modern Materials Science 2015

Grigoriev, M.^1,2 ; Kotelnikov, N.^3 ; Buyakova, S.^1,2,3 ; Kulkov, S.^1,2,3

Institute of Strength Physics and Materials Science SB RAS, 12/4, pr. Akademicheskii, Tomsk

634055, Russia^1

Tomsk Polytechnic University, Lenin Avenue, 30, Tomsk

634050, Russia^2

Tomsk State University, Lenin Avenue, 36, Tomsk

634050, Russia^3

关键词: Argon atmospheres;    Cutting properties;    Hierarchical structures;    Interrupted cutting;    Machining performance;    Nanocrystallines;    Physical and mechanical properties;    Sintering temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/116/1/012002/pdf
DOI  :  10.1088/1757-899X/116/1/012002

来源: IOP

【 摘 要 】

The effect of adding nanocrystalline ZrO2and submicron TiC to ultrafine Al2O3on mechanical properties and the microstructure of the composites developed by hot pressing was investigated. It was shown that by means of hot pressing in an argon atmosphere at a sintering temperature of 1500 °C one can obtain the composites Al2O3- ZrO2- TiC with a fine structure and minimal porosity. It has been shown that in material a multi-scale hierarchical structure is formed, which possesses high physical and mechanical properties: the hardness and fracture toughness was 21.5 GPa and 5.2 MPa∗m1/2respectively, the modulus of elasticity was 500 GPa and bending strength was 390 MPa. Tests on composites' cutting properties were carried out on interrupted cutting of hardened steel. All samples had wear of the cutting edge in the form of chips of the grain rear working surface of the tool, but the cutting tool which was made by Al2O3- 10% ZrO2- 10% TiC had a minimum width of wear.