Abstract
The effect of adding nanocrystalline ZrO2 and submicron TiC to ultrafine Al2O3 on mechanical properties and the microstructure of the composites developed by hot pressing was investigated. It was shown that by means of hot pressing in argon atmosphere at the sintering temperature of 1500 °C one can obtain the composites of Al2O3-ZrO2-TiC with a fine structure and minimal porosity. It was shown that in the material a multi-scale hierarchical structure is formed, which possesses high physical and mechanical properties: the hardness and fracture toughness was 22 GPa and 5.2 MPa*m1/2, respectively. It has been shown that mechanical properties of the composite are better than those of commercial composites based on aluminum oxide (Al2O3, ZTA, Al2O3-TiC) and are comparable to those of silicon nitride.
Highlights
IntroductionThere are various 3D printers that allow printing materials from plastic, metals, ceramic, which is important for the aerospace industry, especially for making very hard and heat resistant engine parts working at high temperatures [1, 2]
Additive technologies are becoming more widely used for various applications
There are various 3D printers that allow printing materials from plastic, metals, ceramic, which is important for the aerospace industry, especially for making very hard and heat resistant engine parts working at high temperatures [1, 2]
Summary
There are various 3D printers that allow printing materials from plastic, metals, ceramic, which is important for the aerospace industry, especially for making very hard and heat resistant engine parts working at high temperatures [1, 2] For such applications, there are composite materials based on high-modulus compounds like MeO-MeC, where MeO is matrix and MeC are strengthening particles, which increase the heat resistance of the material [3, 4]. Alumina-TiC composites are widely used in industry due to their machinability at higher speeds than cemented carbides and their superior hardness, toughness and strength as compared to alumina [5] They are commonly known as black ceramics, consisting for 70% from alumina and for 30% of TiC, having high hardness of about 22 GPa, but insufficient toughness, not more than 4 MPa*m1/2 [6]. Addition of both oxide and non-oxide additives may be an attractive option, as it may impart the beneficial effects of both additives to the resulting
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