With the increase in wall thickness of the casting of iron-nickel-aluminium-bronze, by the reduction of the cooling rate the size of κII phase
precipitates increases. This process, in the case of complex aluminium bronzes with additions of Cr, Mo and W is increased. Crystallization
of big κII phase, during slow cooling of the casting, reduces the concentration of additives introduced to the bronze matrix and hardness.
Undertaken research to develop technology of thick-walled products (g> 6 mm) of complex aluminium bronzes. Particular attention
was paid to the metallurgy of granules. As a result, a large cooling speed of the alloy, and also high-speed solidification casting a light
weight of the granules allows: to avoid micro-and macrosegregation, decreasing the particle size, increase the dispersion of phases in
multiphase alloys. Depending on the size granules as possible is to provide finished products with a wall thickness greater than 6 mm by
infiltration of liquid alloy of granules (composites). Preliminary studies was conducted using drip method granulate of CuAl10Fe5Ni5
bronze melted in a INDUTHERM-VC 500 D Vacuum Pressure Casting Machine. This bronze is a starting alloy for the preparation of the
complex aluminium bronzes with additions of Cr, Mo, W and C or Si. Optimizations of granulation process was carried out. As the process
control parameters taken a casting temperature t (°C) and the path h (mm) of free-fall of the metal droplets in the surrounding atmosphere
before it is intensively cooled in a container of water. The granulate was subjected to a sieve analysis. For the objective function was
assume maximize of the product of Um*n, the percentage weight "Um" and the quantity of granules 'n' in the mesh fraction. The maximum
value of the ratio obtained for mesh fraction a sieve with a mesh aperture of 6.3 mm. In the intensively cooled granule of bronze was
identified microstructure composed of phases: β and fine bainite (α+β'+β'1) and a small quantity of small precipitates κII phase. Get high
microhardness bronze at the level of 323±27,9 HV0,1.