Calorimetric examination of mixtures for modification of nickel and cobalt superalloys
Journal Title: Archiwum Odlewnictwa - Year 2009, Vol 9, Issue 2
Abstract
The study presents the results of thermodynamic calculations and calorimetric examination of thermal reactions taking place at high temperatures between the nanoparticle inoculants and metallic constituents of nickel and cobalt superalloys. The calculations and measurements were made for different compositions, containing cobalt aluminate CoAl2O4, cobalt oxide CoO*Co2O3, zircon flour ZrSi2O4, powdered and metallic Al, powdered Ti, and IN-713C alloy. The obtained results have indicated the possibility of using certain mixtures as potential inoculating additives for the volume modification of nickel and cobalt superalloys. A characteristic feature of these alloys is the formation of a detrimental structure containing very large columnar crystal, present even in castings of a very high solidification rate. It has been proved that the inoculant most effective in the formation of the structure of equiaxial grains is the inoculant based on cobalt aluminate, colloidal silica and powdered aluminium.
Authors and Affiliations
F. Binczyk, J. Śleziona, R. Przeliorz
Keywords
Related Articles
- EP ID EP70546
- DOI -
- Views 103
- Downloads 0
The dimensional and shape accuracy of vacuum castings prepared in plaster moulds
The results of laboratory test on the dimensional and shape accuracy of bronze plaster castings CuSn10, CuSn5Zn5Pb5and AlSi11 silumin are presented in this paper. The test castings were made in form of rods of length 100...
Preparation of porous Al2O3-Ti-C perform by combustion synthesis
Using combustion synthesis porous ceramic preforms for composite reinforcing were produced. Prepared mixture of alumina Saffil fibres, Ti powder and graphite flakes, after drying were placed in waveguide of microwave rea...
Morphology of graphite precipitates in austenitic ductile iron
The final mechanical properties of cast iron depend on the nature and properties of the matrix and on the morphology of graphite precipitates. The article presents the results of studies of the structure of austenitic du...
White and gray solidification of the Fe-C eutectic
The mechanism of structure transition from stable to metastable eutectic is the object of the publication. The influence of micro-segregation elements on forming different phase, growth undercooling and growth rates was...
Bell founding – the past and the present
This paper outlines the history of bell founding. The exceptional character of bells, which are products of supracultural importance, was stressed. The complexity of the bell manufacturing process and a unique approach t...