Investigation of the Formation of a Fine-Crystalline Alumina Coating on the Surface of a Blank Aluminum Powder Coating Test Panel as a Result of its Filtration Combustion

• DOI: 10.1007/s11148-018-0180-x
• Publication Date: 2018-08-02T02:06:41Z
• Authors: D. A. Ivanov; A. I. Sitnikov; G. E. Val’yano; S. D. Shlyapin
• Keywords: 0205 materials engineering; 02 engineering and technology

Formation of a fine-crystalline α-Al2O3 coating on the surface of an aluminum blank powder coating test panel by filtration combustion (FC) in air was investigated. Finely ground sodium silicate glass (1 vol.%) introduced into the composition of the blank aluminum panels was used as the activating agent of the filtration combustion. It was found that a fine-crystalline aluminum oxide coating with a thickness of 30 – 50 μm with crystals ranging 0.1 – 2.0 μm in size forms over the entire surface of the sample upon completion of the filtration combustion. The properties of the produced samples were as follows: density 2.3 g/cm2, open porosity 15%, ultimate bending stress 120 MPa, fracture toughness 3.6 MPa·m1/2, Brinell hardness 32.