ПОКРАЩЕННЯ ФІЗИКО-МЕХАНІЧНИХ ТА ФІЗИКО-ХІМІЧНИХ ВЛАСТИВОСТЕЙ ШЛІФПОРОШКІВ АЛМАЗУ ЧЕРЕЗ ЗАСТОСУВАННЯ ІННОВАЦІЙНИХ МЕТОДІВ ЇХНЬОГО РОЗДІЛЕННЯ ЗА МІЦНІСТЮ

V. SMOKVYNA; H. ILNYTSKA; V. LAVRINENKO; O. LOGINOVA; S. STARIK

doi:10.15407/scine21.04.065

Authors

V. SMOKVYNA V. Bakul Institute for Superhard Materials of the National Academy of Science of Ukraine https://orcid.org/0000-0002-4181-7274
H. ILNYTSKA V. Bakul Institute for Superhard Materials of the National Academy of Science of Ukraine https://orcid.org/0000-0001-5124-1646
V. LAVRINENKO V. Bakul Institute for Superhard Materials of the National Academy of Science of Ukraine https://orcid.org/0000-0003-2098-7992
O. LOGINOVA V. Bakul Institute for Superhard Materials of the National Academy of Science of Ukraine https://orcid.org/0000-0002-2360-2843
S. STARIK V. Bakul Institute for Superhard Materials of the National Academy of Science of Ukraine https://orcid.org/0000-0003-1991-3275

DOI:

https://doi.org/10.15407/scine21.04.065

Keywords:

Diamond grinding powders, surface defects, separation by surface defects, finely dispersed copper and iron particles, solution pH, magnetic separation, uniformity and strength of powders

Abstract

Introduction. In the machine-building industry, the performance of highly productive diamond abrasive tools
critically depends on the quality of the diamond grinding powders used. Optimal tool efficiency requires powders
that exhibit high uniformity in both particle size and strength.
Problem Statement. In both the production and operational use of grinding tools, diamond grinding powders with heterogeneous particle size and mechanical strength characteristics are commonly employed. This variability negatively affects tool performance and wear resistance.
Purpose. This study aims to enhance the selectivity of separation processes for diamond grinding powders
synthesized under different growth conditions. The focus is on the implementation of combined gravitational separation schemes that integrate magnetic and electrostatic separation techniques.
Materials and Methods. To improve powder uniformity by increasing property contrast, fine copper and iron
particles have been deposited onto diamond powder grains (grades AC20–AC32) via adsorption from aqueous
solutions at various pH levels. This surface modification has significantly enhanced the magnetic and electrical
responses of the grains, enabling their effective separation in external magnetic and electric fields based on these
induced differences.
Results. An adhesive-magnetic sorting method has been developed, enabling the separation of diamond grinding powders into fractions with greater uniformity in shape and particle size, as well as improved thermal resistance. The powders obtained via this method demonstrate superior strength and uniformity and can be classified as elite-grade materials.
Conclusions. The application of gravitational methods, in combination with surface modification and magnetic/
electric field-assisted separation, has proven effective for classifying diamond grinding powders according to defectiveness and strength. The resulting powders, characterized by high thermal stability and consistent particle dimensions and strength properties, significantly enhance the performance and durability of diamond-based abrasive tools.

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