Method of producing alumina ceramics reinforced with oil fly ash
AssigneeKing Fahd University of Petroleum and Minerals
InventorsAbbas Saeed Hakeem, Akolade Idris Bakare, Muhammad Ali Ehsan
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Abstract
A method for making ceramic composites via sintering a mixture of alumina and oil fly ash. The alumina is in the form of nanoparticles and/or microparticles. The oil fly ash may be treated with an acid prior to the sintering. The composite may comprise graphite carbon derived from oil fly ash dispersed in an alumina matrix. The density, mechanical performance (e.g. Vickers hardness, fracture toughness), and thermal properties (e.g. thermal expansion, thermal conductivity) of the ceramic composites prepared by the method are also specified.
Claims20
A method of producing a composite comprising oil fly ash dispersed in an alumina matrix, the method comprising:
- treating an oil fly ash with an acid mixture comprising sulfuric acid and nitric acid in a volumetric ratio of 2:1 to 5:1 to produce a treated oil fly ash;
- sonicating the treated oil fly ash and alumina in an organic solvent to form a slurry;
- heating the slurry to form a mixture;
- and
- sintering the mixture thereby producing the composite,
- wherein:
- a weight ratio of the alumina to the oil fly ash is in a range of 9:1 to 500:1;
- the sintering comprises applying a uniaxial pressure ranging from 30-80 MPa to the mixture;
- and
- the treated oil fly ash has a carbon content, a nickel content, an iron content, and a vanadium content which are lower compared to the oil fly ash, and a sulfur content and an oxygen content which are higher compared to the oil fly ash.
Dependencies are inferred from the claim text.