Abstract
In this study, the calcined coal gangue was mixed with Al powder at different mass fractions (5wt%〜35wt%). After being pressed at 80MPa and sintered at 1200°C for 2h, the coal gangue/Al cermet material was obtained. The phase composition, microstructure and mechanical properties of the material were studied. The results show that the main components of the prepared materials are Al, mullite, AlN, alumina and silicon. With the increase of coal gangue powder, the hardness of coal gangue/Al cermet gradually increases, while the static compression strength first increases and then decreases. When the mass fraction of gangue is 25wt%, the coal gangue/Al cermet material has the best performance. Density is 2.23g/cm3, hardness is 752HV, static compression strength is 127.3MPa.
Highlights
These Coal gangue is a kind of solid waste which is separated in the process of coal production, and it increases and accumulates in large amount every year
The results show that adding ceramic particles into Al matrix can improve the strength, hardness, wear resistance and corrosion resistance[7,8]
It is inferred that the Following chemical reaction occurred: Mullite formation reaction: Silicon formation reaction: of samples gets lower and lower, mainly because the density of coal gangue is lower than Al
Summary
These Coal gangue is a kind of solid waste which is separated in the process of coal production, and it increases and accumulates in large amount every year. Coal gangue is mainly used in filling materials and power generation, which have low utilization rate and low added value[2]. The main components of gangue removing organic impurities are SiO2 and Al2O3 (>90%), which are the raw materials for preparing ceramics with excellent performance[3]. The utilization of silica-alumina ceramic raw materials in coal gangue has become a research hotspot[4]. Cermet is a composite material consisting of a metal or alloy and one or more ceramic phases. The effects of different formulations on phase composition, mechanical properties and microstructure of gangue/Al cermet materials were explored
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