Search

Your search keyword '"BOROWIECKA-JAMROZEK, Joanna"' showing total 15 results
Start Over Author "BOROWIECKA-JAMROZEK, Joanna"
15 results on '"BOROWIECKA-JAMROZEK, Joanna"'

1. Fabrication and Characteristics of Cast Aluminium-Mineral Particles Composite.

Author

Kargul, Marcin and Borowiecka-Jamrozek, Joanna

Subjects
LIQUID alloys, PERLITE, ALUMINUM composites, MANUFACTURING processes, COMPUTED tomography
Abstract

The paper presents the results of research on the production of cast composites based on aluminum alloys with a mineral filler with a porous structure. AlSi12 silumin and AlSi12 silumin with the addition of 3% magnesium (AlSi12-Mg3) were used as the matrix material, while particles of natural zeolite, expanded perlite and expanded clay with a size of 4 to 6 mm were used as the mineral filler. In order to increase the efficiency of the production process, the mineral particles have been covered with a sodium silicon solution with the addition of silicon powder. The coated particles were then heated at 400 ℃ for 1 hour to remove moisture from them. The prepared mineral particles were then placed inside a casting mold and flooded with liquid alloy at a temperature of 790 ℃. The obtained composites were subjected to macroscopic observations and analysis using computed tomography (CT). Phase analysis was also performed to determine the phase composition of the obtained composites. In order to determine the mechanical and physical properties, the obtained composites were subjected to compressive strength tests and density measurements. As a result of the research, it was found that the use of the AlSi12-Mg3 alloy and coating in the form of a solution of sodium silicate and silicon powder allows for the most effective production of composites. The low density of the produced composites, combined with their favorable structure and strength properties, suggest the possibility of use as light products transferring compressive stresses, as well as energy-absorbing products. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

12. Economical and technical aspects of producing of diamond impregnated tools

Author

Borowiecka-Jamrozek, Joanna and Lachowski, Jan

Subjects
diamond impregnated tools, metallic matrix, industrial diamonds, cobalt, sinters
Abstract

In the paper the analysis of dynamics of mining, production and prices of industrial diamonds and cobalt was performed during 1900-2011 years. Cobalt is using as a based material used for matrix of diamond impregnated tools for cutting of natural stones. Until the early 1950s the developments in diamond tools were relatively slow. In that period only mined diamond crystals were available. Much faster developments in the tool manufacturing technology was caused by development the production of synthetic diamonds. Only the possibility of producing synthetic diamond allowed for controlled modification of the shape and properties of particles, from very finegrained, used for grinding and polishing, to large, strong crystals of the regular, multifaceted shape. In the new millennium the market for diamond tools continues to grow rapidly. The effective use of diamond impregnated tools is strongly depended on the retentive properties of the metal matrix, which must hold diamond grits firmly. The diamond retentive capability in a matrix is a complex property, affected mainly by chemical or mechanical interactions during hot pressing and then cooled to room temperature. Due to mismatch between thermal expansion coefficients of the matrix and diamond, the stress/strain field is generated in the matrix at diamond surroundings, which plays a major role when retentive properties are considered. The potential retentive capability of a matrix can be associated with the amount of elastic and plastic deformation energy and the size of a deformated zone which occurs in the matrix around diamond particles. The costs of producing diamond impregnated tools are influenced by the costs of cobalt metallic matrix. After World War II the price of cobalt further fluctuated on a balanced level, until the mid 1970s when the price increased rapidly The possibility of substitution of cobalt with the other cheaper alloys was considered which as a matrix material gives similar utilizing properties.

Published
2013

14. Modelling Thermomechanical Response of a Diamond Particle in a Metallic Matrix.

Author

LACHOWSKI, Jan and BOROWIECKA-JAMROZEK, Joanna

Abstract

The paper deals with numerical and analytical modelling of synthetic diamond particle retention in a metallic matrix. The model of a diamond particle embedded in a metallic matrix was created using the Abaqus software. The numerical results were compared with the experimental data. The analytical model of a spherical particle in a metallic matrix was built. The analysis has indicated the mechanical parameters responsible for the retention of diamond particles in a matrix. [ABSTRACT FROM AUTHOR]

Published
2017

Catalog

Books, media, physical & digital resources
See catalog results