Properties of AlB$_{12}$–Al Electric Spark Coatings on D1 Aluminium Alloy

Abstract

The article deals with the study of the structure and properties of electric spark coatings of AlB 12 -50 wt.% Al aluminium-matrix composite electrode material on D1 aluminium alloy. Fundamental possibility of such coatings obtaining is estimated by theoretical calculation of Palatnik's criterion (0.59). Thermal conductivity coefficient and heat capacity of the composite are calculated or determined from an experiment. Mass transfer kinetics at electric spark alloying (ESA) is studied. Considering a rather high values of the cathode mass gain, the coating applied in 6 mode (E = 2.52 J, τ = 700 µs, ALIER-52 setup) is selected for further research. The thickness (h = 380 µm), microhardness (H µ = 1.86 GPa, PMT-3 tester, P = 0.05 N) and wear at dry friction (13.7 mg/(km⋅cm 2 ), MT-68 friction machine, the pin-on-disk scheme, V = 4 m/s, P = 0.2 MPa, friction path S = 3 km) are determined for the coating.

Application of AlB$_{12}$–Al Electric Spark Coatings to Protect Titanium Alloys During Wear Under Fretting Corrosion

“…The structure of the material consists of three phases: a metal matrix, AlB12 grains (the size of which varies in the range of 1-4 µm) uniformly distributed in the matrix, and Al2O3 particles (the cross-section microstructure of the electrode material AlB12-50 wt.% Al, obtained with a JEOL JAMP9500F microanalyzer and the result of its micro xray spectral analysis at local points are given in [17]).…”