Abstract
Polycrystalline cBN/copper composite abrasive particles were prepared by an electroless powder coating process. Ti metallization and tin/silver metallization techniques were used to improve the coating process by depositing an autocatalytic metallic layer on the surface of the cBN particles. Metallized, as well as un-metallized, cBN particles were further coated by copper using electroless deposition. Electroless copper coating of un-metallized and metallized cBN particles by 90 wt.% of copper were achieved. The surface morphology, the composition and the crystalline phase identifications of the metallized cBN particles, as well as the 10 wt.% cBN /copper composite powders, were investigated by field emission scanning electron microscopy, an energy-dispersive spectrometer and an X-ray diffractometer. The results show that the surface of the Ti metalized and tin/Ag-metallized cBN particles were covered by the nanosized Ti or Ag layer, respectively, which enhanced the deposition of the copper during the electroless deposition bath. The results also showed that the deposited layer on the metallized cBN particles was composed mainly of metallic copper. The produced 10 wt.% cBN/copper composite particles also underwent thermo-gravimetric analysis to investigate its stability at high temperature. It was revealed that the Ti-metallized cBN/copper composite powder has higher stability at 800 °C under the environmental conditions than the tin/silver-metallized and the un-metallized cBN/copper composite particles, respectively.
Highlights
Abrasive materials have several important characteristics, such as high hardness and longevity; quick cutting or wear of surfaces and stiffness are important for applying specific forming or cutting techniques, especially in the production of pipes and wires
CBN particles are chemically stable against usual acids, concentrated hydrochloric acid was used in this investigation to clean its surfaces from any foreign inorganic impurities
10 wt.% cubic boron nitride (cBN)/ copper composite abrasive particles were prepared by electroless copper deposition at room temperature
Summary
Abrasive materials have several important characteristics, such as high hardness and longevity; quick cutting or wear of surfaces and stiffness are important for applying specific forming or cutting techniques, especially in the production of pipes and wires. The tribological surface properties of the abrasive particles are especially crucial for subsequent uses to control the wear and tear processes. Different minerals in nature are used as abrasive materials. Alumina and silicon carbide are the most common minerals used in the production of cutting tools, sandpapers, grinding wheels and other abrasive products [2]. Different synthetic materials are used as abrasive particles [3]. The synthetic abrasives and their application can be categorized in three groups. The third group is the super hard materials, such as diamond and cubic boron nitride (cBN) [3]
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